US20090199453A1 - Method to determine hold over ballistic information - Google Patents

Abstract

A handheld rangefinder device operable to determine ballistic hold over information is disclosed. The rangefinder device generally includes a range sensor operable to determine a first range to a target, a tilt sensor operable to determine an angle to the target relative to the device, and a computing element, coupled with the range sensor and the tilt sensor, operable to determine a hold over value based on the first range and the determined angle. Such a configuration facilitates accurate firearm and bow use by providing ranges and hold over values without requiring time-consuming and manual user calculations.

Description

RELATED APPLICATION
• The present application is a continuation patent application and claims priority benefit, with regard to all common subject matter, of earlier-filed U.S. patent application titled “HANDHELD RANGEFINDER OPERABLE TO DETERMINE HOLD OVER BALLISTIC INFORMATION”, Ser. No. 11/314,593, filed Dec. 21, 2005. The identified earlier-filed application is hereby incorporated by reference into the present application.
BACKGROUND OF THE INVENTION
• 1. Field of the Invention
• The present invention relates to handheld rangefinders that assist a user in compensating for deviations in projectile trajectory. More particularly, the present invention relates to a handheld rangefinder that utilizes a range sensor and a tilt sensor to determine hold over ballistic information corresponding to projectile trajectories.
• 2. Description of the Related Art
• Hunters and other firearm and bow users commonly utilize handheld rangefinders to determine ranges to targets. Generally, handheld rangefinders utilize lasers to acquire ranges for display to a hunter. Utilizing the displayed ranges, the hunter makes sighting corrections to facilitate accurate shooting. Unfortunately, due to variations in elevation and slope, the ranges determined by handheld rangefinders often are not accurate representations of the horizontal distances projectiles must travel.
• For example, as shown inFIG. 1, a hunter positioned above or below a target may be provided a range, 9 yards for instance, that is different than the actual horizontal distance to the target, 5 yards for instance, thereby resulting in inaccurate shooting. Further, handheld rangefinders fail to determine hold over ballistic information corresponding to the amount by which hunters must vary their aim, thereby forcing hunters to manually perform hold over calculations.
• Devices operable to compensate for slope and elevation utilizing lasers and inclinometers have been developed to alleviate some of these problems. For example, U.S. patent application Ser. Nos. 10/867,429 and 10/964,206, which are incorporated herein by reference, disclose telescope sights and other optical devices having a laser range sensor and an inclinometer. Unfortunately, these devices have a limited field of vision, must be attached to a firearm or bow, or are unable to provide hold over ballistic information. Thus, hunters are unable to avail themselves of the beneficial aspects of handheld rangefinders, such as increased field of vision, maneuverability, and portability, while correcting for range, slope, elevation, and rangefinder orientation utilizing hold over ballistic information.
SUMMARY OF THE INVENTION
• The present invention solves the above-described problems and provides a distinct advance in the art of handheld rangefinders. More particularly, the invention provides a handheld rangefinder that utilizes a range sensor and a tilt sensor to determine hold over ballistic information corresponding to projectile trajectories. Such a configuration facilitates accurate firearm and bow use by providing ranges and hold values without requiring time-consuming and manual user calculations.
• In one embodiment, the present invention provides a rangefinder device for determining hold over ballistic information. The device generally includes a range sensor operable to determine a first range to a target, a tilt sensor operable to determine an angle to the target relative to the device, and a computing element, coupled with the range sensor and the tilt sensor, operable to determine a hold over value based on the first range and the determined angle.
• In another embodiment, the rangefinder device includes a laser range sensor operable to determine a first range to a target, a tilt sensor operable to determine an angle to the target relative to the device, a memory comprising a database of ranges and corresponding projectile drop values, a computing element operable to determine a hold over value based on the first range and the determined angle by acquiring one of the projectile drop values from the database and modifying the acquired projectile drop value utilizing the determined angle, and a display operable to indicate the first range and the hold over value.
• In another embodiment, the rangefinder device includes a laser range sensor operable to determine a first range to a target, a tilt sensor including an inclinometer operable to determine an angle to the target relative to the device, an input operable to receive configuration information from a user, a memory comprising a database of ranges and corresponding projectile drop values, a computing element operable to determine a hold over value based on the first range, the configuration information, and the determined angle by acquiring one of the projectile drop values from the database and modifying the acquired projectile drop value utilizing the determined angle, a display operable to indicate the first range and the hold over value, and a portable handheld housing.
• In another embodiment, the present invention provides a method for determining hold-over ballistic information. The method generally comprises determining a first range to a target, determining an angle to the target, and determining a hold over value based on the first range and the determined angle by acquiring a projectile drop value and modifying the projectile drop value utilizing the determined angle.
• Other aspects and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments and the accompanying drawing figures.
BRIEF DESCRIPTION OF THE DRAWINGS
• A preferred embodiment of the present invention is described in detail below with reference to the attached drawing figures, wherein:
• FIG. 1 is a schematic view showing various distances between a hunter and a target;
• FIG. 2 is a block diagram of a rangefinder device configured in accordance with various preferred embodiments of the present invention;
• FIG. 3 is a rear perspective view of the rangefinder device ofFIG. 2;
• FIG. 4 is a front perspective view of the rangefinder device ofFIGS. 2-3;
• FIG. 5 is a diagram illustrating a first range to a target and an associated projectile trajectory;
• FIG. 6 is a diagram illustrating a second range and an associated projectile trajectory to the target ofFIG. 4 when the target is elevated;
• FIG. 7 is a diagram illustrating an angle to an elevated target relative to the device;
• FIG. 8 is a diagram illustrating various angles and projectile trajectories relative to the device;
• FIG. 9 is a chart illustrating a plurality of ballistic curves; and
• FIG. 10 a schematic view of a target observed while looking through the device, a display indicating the first range, the second range, and a hold over value.
• The drawing figures do not limit the present invention to the specific embodiments disclosed and described herein. The drawings are not necessarily to scale, emphasis instead being placed upon clearly illustrating the principles of the invention.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
• The following detailed description of the invention references the accompanying drawings that illustrate specific embodiments in which the invention can be practiced. The embodiments are intended to describe aspects of the invention in sufficient detail to enable those skilled in the art to practice the invention. Other embodiments can be utilized and changes can be made without departing from the scope of the present invention. The following detailed description is, therefore, not to be taken in a limiting sense. The scope of the present invention is defined only by the appended claims, along with the full scope of equivalents to which such claims are entitled.
• Turning now to the drawing figures, and particularlyFIGS. 1-10, arangefinder device10 is shown constructed in accordance with various preferred embodiments of the present invention. Thedevice10 generally includes arange sensor12 for determining a first range to a target T, atilt sensor14 for determining an angle to the target T, acomputing element16 coupled with therange sensor12 and thetilt sensor14 for determining ballistic information relating to the target T based on the first range and the determined angle, amemory18 for storing data such as ballistic information and a computer program to control the functionality of thedevice10, and a portablehandheld housing20 for housing therange sensor12, thetilt sensor14, thecomputing element16, thememory18, and other components described below.
• A computer program preferably controls input and operation of thedevice10. The computer program includes at least one code segment stored in or on a computer-readable medium residing on or accessible by thedevice10 for instructing therange sensor12,tilt sensor14,computing element16, and any other related components to operate in the manner described herein. The computer program is preferably stored within thememory18 and comprises an ordered listing of executable instructions for implementing logical functions in thedevice10. However, the computer program may comprise programs and methods for implementing functions in thedevice10 which are not an ordered listing, such as hard-wired electronic components, programmable logic such as field-programmable gate arrays (FPGAs), application specific integrated circuits, conventional methods for controlling the operation of electrical or other computing devices, etc.
• Similarly, the computer program may be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device, and execute the instructions. The computer-readable medium may even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance, optical scanning of the paper or other medium, then compiled, interpreted, or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.
• Thedevice10 and computer program described herein are merely examples of a device and a program that may be used to implement the present invention and may be replaced with other devices and programs without departing from the scope of the present invention.
• Referring toFIGS. 2-4, therange sensor12 is operable to determine the first range to the target T from thedevice10. Therange sensor12 may be any conventional sensor or device for determining range. The first range preferably represents a length of an imaginary line drawn between thedevice10 and the target T, as shown inFIG. 5, such as the number of feet, meters, yards, miles, etc, directly between thedevice10 and the target T. Thus, the first range may correspond to a line of sight (LOS) between thedevice10 and the target T.
• Preferably, therange sensor12 is a laser range sensor which determines the first range to the target by directing a laser beam at the target T, detecting a reflection of the laser beam, measuring the time required for the laser beam to reach the target and return to therange sensor12, and calculating the first range of the target T from therange sensor12 based on the measured time. Thus, therange sensor12 may include an emitter and a detector to emit the laser beam and then detect the reflection of the laser beam in a generally conventional manner.
• Therange sensor12 is operable to determine a range to a target even when objects, such as trees, people, vehicles, foliage, etc, are positioned between the device and the target. As a result, therange sensor12 may determine the first range to the target T in a variety of situations, including in outdoor situations where various trees and/or other foliage may obstruct a direct view of the target T.
• Therange sensor12 may also include memory and processing capabilities separate from thecomputing element16 andmemory18, such that the range sensor is operable to determine the range to the target T without the assistance of additional components. However, therange sensor12 may rely upon the capabilities provided by thecomputing element16 andmemory18 to specifically calculate and determine the first range.
• Therange sensor12 may alternatively or additionally include other range sensing components, such as conventional optical, radio, sonar, or visual range sensing devices to determine the first range in a substantially conventional manner.
• Thetilt sensor14 is operable to determine the angle to the target T from thedevice10 relative to the horizontal. Thus, as shown inFIGS. 5,7, and8, if thedevice10 and the target T are both positioned on a flat surface having no slope, the angle would be zero. As shown inFIGS. 6 and 8, if thedevice10 is positioned below the target T the slope between thedevice10 and the target T is positive, the angle would be positive. Conversely, as shown inFIG. 8, if thedevice10 is positioned above the target T, such that the slope between thedevice10 and the target T is negative, the angle would be negative.
• It will be appreciated that the angle is not dependent upon the specific contours of the ground, surface, or surfaces between thedevice10 and the target T, but rather the angle is preferably determined based on the orientation of thedevice10, as described below.
• Thetilt sensor14 preferably determines the angle by sensing the orientation of thedevice10 relative to the target T and the horizontal. The orientation of thedevice10 changes based on the relative position of the target T to thedevice10, as a user of thedevice10 aligns thedevice10 with the target T and views the target T through aneyepiece22 and anopposed lens24, as described in more detail below. Thus, the orientation of thedevice10, specifically the tilt of thedevice10 along its longitudinal axis relative to the horizontal, indicates if the target T is above or below thedevice10.
• For example, if the target T is above thedevice10, the user of thedevice10 would tilt thedevice10 such that adistal end26 of thedevice10 would be raised relative to aproximate end28 of thedevice10 and the horizontal. Similarly, if the target T is below thedevice10, the user of thedevice10 would tilt thedevice10 such that thedistal end26 of thedevice10 would be lowered relative to theproximate end28 of the device and the horizontal. T
• Thetilt sensor14 preferably determines the angle of the target to thedevice10 based on the amount of tilt, that is the amount theproximate end28 is raised or lowered relative to thedistal end26, as described below. Thetilt sensor14 may determine the tilt of the device, and thus the angle, through various orientation determining elements. For instance, thetilt sensor14 may utilize one or more single-axis or multiple-axis magnetic tilt sensors to detect the strength of a magnetic field around thedevice10 ortilt sensor14 and then determine the tilt of thedevice10 and the angle accordingly. Thetilt sensor14 may determine the tilt of the device using other or additional conventional orientation determine elements, including mechanical, chemical, gyroscopic, and/or electronic elements, such as a resistive potentiometer.
• Preferably, thetilt sensor14 is an electronic inclinometer, such as a clinometer, operable to determine both the incline and decline of thedevice10 such that the angle may be determined based on the amount of incline or decline. Thus, as thedevice10 is aligned with the target T by the user, and thedevice10 is tilted such that itsproximate end28 is higher or lower than itsdistal end26, thetilt sensor14 will detect the amount of tilt which is indicative of the angle.
• Thecomputing element16 is coupled with therange sensor12 and thetilt sensor14 to determine ballistic information relating to the target T, including hold over ballistic information, as is discussed in more detail below. Thecomputing element16 may be a microprocessor, microcontroller, or other electrical element or combination of elements, such as a single integrated circuit housed in a single package, multiple integrated circuits housed in single or multiple packages, or any other combination. Similarly, thecomputing element16 may be any element which is operable to determine hold over ballistic information from the first range and angle as described below. Thus, thecomputing element16 is not limited to conventional microprocessor or microcontroller elements and may include any element which is operable to perform the functions described below.
• Thememory18 is coupled with thecomputing element16 and is operable to store the computer program and a database including ranges, projectile drop values, and configuration information, as is discussed in detail below. Thememory18 may be, for example, an electronic, magnetic, optical, electro-magnetic, infrared, or semi-conductor system, apparatus, device, or propagation medium. More specific, although not inclusive, examples of thememory18 include the following: volatile and non-volatile memory, an electrical connection having one or more wires, a portable computer diskette, a random access memory (RAM), a read-only memory (ROM), an erasable, programmable, read-only memory (EPROM or Flash memory), an optical fiber, a portable compact disc (CD), or a digital video disc (DVD). However, thememory18 may be of any form operable to store the necessary computer program and data.
• Thememory18 may be integral with thecomputing element16, such that thememory18 and thecomputing element16 are stored within or on the same wafer, die, or package, or thememory18 may be discrete with thecomputing element16 such that thememory18 and thecomputing element16 are stored on different wafers, dies, or packages. Additionally, thememory18 may be coupled with other components, such as therange sensor12 andtilt sensor14, to enable the other components to utilize the functionality provided by thememory18. Thememory18 may also be accessible by other external devices, such as conventional computing devices, to enable data stored within the memory, such as the database or the computer program, to be easily accessed or modified by conventional computing devices.
• Thedevice10 also preferably includes adisplay30 to indicate relevant information such as the target T, the first range, the angle, and ballistic information such as hold over information, a reticle or other alignment element, etc. Thedisplay30 may be a conventional electronic display, such as a LED, TFT, or LCD display. Preferably, thedisplay30 is viewed by looking through theeyepiece22 such that the user may align the target T and simultaneously view relevant information, as shown inFIG. 10.
• For instance, the user may look through theeyepiece22, align the target T, view the target T, and generally simultaneously view thedisplay30 to determine the first range, the angle θ, hold over value, and/or other relevant information. The generally simultaneous viewing of the target T and the relevant information enables the user to quickly and easily determine ranges and ballistic information corresponding to various targets by moving thedevice10 in an appropriate direction and dynamically viewing the change in the relevant information on thedisplay30.
• The portablehandheld housing20 houses therange sensor12,tilt sensor14, computingelement16, and/or other desired elements such as thedisplay30, one ormore inputs32,eyepiece22,lens24, laser emitter, laser detector, etc. Thehandheld housing20 enables thedevice10 be easily and safely transported and maneuvered for convenient use in a variety of locations.
• For example, the portablehandheld housing20 may be easily transported in a backpack for use in the field. Additionally, the location of the components on or within thehousing20, such as the position of theeyepiece22 on theproximate end28 of thedevice10, the position of thelens24 on thedistal end26 of the device, and the location of theinputs32, enables thedevice10 to be easily and quickly operated by the user with one hand without a great expenditure of time or effort.
• Theinputs32 are coupled with thecomputing element16 to enable users, third parties, or other devices to share information with thedevice10. Theinputs32 is generally associated with thehousing20, such as by physical connection through wires, etc, or wirelessly utilizing conventional wireless protocols. Thus, theinputs32 need not be physically coupled with thehousing20. However, theinputs32 are preferably positioned on thehousing20 to enable the user to simultaneously view thedisplay30 through theeyepiece22 and function theinputs32.
• Theinputs32 preferably comprise one or more functionable inputs such as buttons, switches, scroll wheels, etc, a touch screen associated with thedisplay30, voice recognition elements, pointing devices such as mice, touchpads, trackballs, styluses, combinations thereof, etc. Further, theinputs32 may comprise wired or wireless data transfer elements such as removable memory including thememory18, network connections, data transceivers, etc, to enable the user and other devices or parties to remotely interface with thedevice10.
• In operation, the user aligns thedevice10 with the target T and views the target T on thedisplay30. Thedevice10 may provide generally conventional optical functionality, such as magnification or other optical modification, by utilizing thelens24 and/or thecomputing element16. Preferably, thedevice10 provides an increased field of vision as compared to conventional riflescopes to facilitate conventional rangefinding functionality.
• Further, the user may function theinputs32 to control the operation of thedevice10. For example, the user may activate thedevice10, provide configuration information as discussed below, and/or determine a first range, a second range, angle, and ballistic information by functioning one or more of theinputs32.
• For instance, the user may align the target T by centering the reticle over the target T and functioning at least one of theinputs32 to cause therange sensor12 to determine the first range. Alternatively, therange sensor12 may dynamically determine the first range for all aligned objects such that the user is not required to function theinputs32 to determine the first range. Similarly, thetilt sensor14 may dynamically determine the angle for all aligned objects or the tilt sensor may determine the angle when the user functions at least one of theinputs32. Thus, the ranges, angle, and ballistic information discussed below may be dynamically displayed to the user.
• In various embodiments, thedevice10 enables the user to provide configuration information to facilitate determination of ballistic information, including hold over information, by thecomputing element16. The configuration information includes mode information to enable the user to select between various projectile modes, such as bowhunting and firearm modes discussed below in more detail, to enable thedevice10 to provide information corresponding to the selected mode, as is described below. Further, the configuration information may include projectile information, such as a bullet size, caliber, grain, shape, type, etc and firearm caliber, size, type, sight-in distance, etc.
• Preferably, the provided configuration information corresponds to one of a plurality of ballistic curves. For example, the user may select one curve, or provide an indication relating to one curve, instead of entering detailed and complex ballistic information such as bullet shape, grain, caliber, etc. As shown inFIG. 9, five sample curves, C1-C5, are provided each corresponding to a particular ballistic profile. For instance, C4 may correspond to a pistol profile, C3 may correspond to a small-caliber rifle profile, C2 may correspond to a rifle profile, C5 may correspond to a medium-power rifle profile, C1 may correspond to a high-power rifle profile, etc. As should be appreciated, innumerable combinations of ballistic curves may exist each corresponding to any ballistic profile. Various ballistic curves and associated projectile drops are disclosed in U.S. Pat. No. 3,990,155, which is incorporated herein by reference.
• The user may provide the configuration information to thedevice10 by functioning theinputs32. For example, the user may depress one or more of theinputs32 to provide configuration information and/or the user may provide electronic data utilizing theinputs32 through a data connection, etc. Additionally, thedisplay30 may present prompts, indication elements, menus, selectable lists, etc, to help the user in providing the configuration information.
• Further, thememory18 may include information corresponding to configuration information to enable the user-provided configuration information to be stored by thememory18. Also, thememory18 may include a database of configuration information, such as the plurality of ballistic curves or data corresponding to the ballistic curves, to enable the user to select configuration information from the data stored by thememory18. For example, thedisplay30 may provide a listing of stored configuration information for selection by the user.
• In embodiments where thememory18 comprises non-volatile memory, the configuration information may be permanently stored by the user such that the user need not repeatedly provide the information each time thedevice10 is used. However, due to the ease in which one of the plurality of ballistic curves may be selected, utilization of non-volatile memory is not necessary in all embodiments.
• In various embodiments, thedevice10 is operable to determine a second range to the target T and display an indication of the second range to the user. Thecomputing element16 is coupled with therange sensor12 and thetilt sensor14 to determine the second range to the target T based on the first range and the determined angle. The second range may be determined statically such that the second range is determined only at desired intervals or upon input by the user. Conversely, the second range may be dynamically determined such that the second range may be continuously updated as new first ranges or angles or provided. Thus, the second range may be accurately determined for moving targets, such as a hunted animal, as the change in the targets position is accounted for by the dynamic calculations.
• Thecomputing element16 determines the second range to the target T by adjusting the first range based upon the angle. Preferably, thecomputing element16 determines the second range by multiplying the first range by the sine or cosine of the angle. For instance, when the hunter is positioned above the target, the first range is multiplied by the sine of the angle to determine the second range. When the hunter is positioned below the target, the first range is multiplied by the cosine of the angle to determine the second range.
• Thus, the second range preferably represents a horizontal distance the projectile must travel such that the estimated trajectory of the projectile generally intersects with the target T. In contrast, the first range represents the length of an imaginary line, such as a line of sight, between thedevice10 and the target T, which is a substantially straight line, as described above. As is known in the art, projectiles which are not self-propelled, such as bullets, golf balls, footballs, arrows, etc, move through air according to a generally parabolic (ballistic) curve due primarily to the effects of gravity and air drag. In situations where the angle is zero, the parabolic movement of the projectile does not substantially affect the range calculation, such that the first range and the second range may be substantially equal.
• As shown inFIG. 6, in situations where the angle is non-zero, such as when the target T is positioned above or below thedevice10, the parabolic movement of the projectile affects the range calculation, such that the projectile may have to travel a longer or shorter distance to reach the target T. Thus, the second range provides an accurate representation to the user of the flat-ground distance the projectile must travel to intersect the target T.
• For example, referring toFIG. 1, thedevice10 would determine the first range to be 9 yards, as the first range generally corresponds to a line of sight between thedevice10 and the target T. Thedevice10 would determine the second range, utilizing the angle acquired by thetilt sensor14, to be 5 yards, representing the horizontal distance the projectile must travel to strike the target T.
• Although the second range may be dynamically presented by thedisplay30 without requiring user input, the second range is preferably displayed only when thedevice10 is in bowhunting mode as indicated by the user-provided information. Such a configuration may be desirable as a true horizontal distance to a target, as indicated by the second range, may be of little use to firearms that have compact ballistic curves due to the high velocity at which fired projectiles travel. In contrast, bow-fired projectiles are fired with controllable force by the user at generally short ranges such that the second range greatly facilitates targeting, as is shown inFIG. 1.
• Thedevice10 is further operable to determine ballistic information including a hold over value corresponding to an amount of hold over. As is known in the art, hold over refers to the amount by which the user must aim high, or above the target, to compensate for the effects of trajectory, projectile drop, and angle. Thus, the hold over value determined by thedevice10 provides an indication of how much, or to what degree, the user must aim high in relation to the target to accurately fire a projectile.
• FIG. 8 illustrates three exemplary projectile trajectories and corresponding bullet drops. For each angle, positive, zero, and negative, three paths are illustrated: path1 corresponds to a line of departure, which represents an a projectile trajectory comprising a hypothetical infinite straight line;path2 corresponds to a parabolic (ballistic) trajectory resulting from the effects of gravity and drag on path1; andpath3 corresponds to a light of sight to the target. As can be seen, the difference between path1 andpath2 corresponds to projectile drop, which varies as the range and angle changes.
• As is known in the art and as shown inFIG. 8, firing a projectile at uphill or downhill angles affects the trajectory of the projectile by causing the projectile to impact high relative to the projectile path for level fire. The deviations in trajectory grow larger as range and angle increase. Further, projectiles impact slightly higher when fired downhill than uphill at the same angle due to the varying effects of gravity on uphill and downhill trajectories. Thus, to correct for projectile drop, it is generally necessary to aim above a target.
• Additionally, as will be appreciated by those skilled in the art, the amount of hold over is dependent on the range at which a firearm is sighted in. For instance, firearms are typically sighted in at 100 yards, to build-in appropriate hold over for projectile drop, such that a user need not hold over when firing at targets at 100 yards, but would need to hold over for targets substantially over 100 yards. Thedevice10 preferably utilizes a default sight in distance of 100 yards, which may be stored in thememory18. However, thedevice10 may utilize a user-provided sight in distance, as discussed above, to determine the hold over value.
• Thedevice10 may determine the hold over value utilizing various methods. Preferably, thecomputing element16 determines the hold over value utilizing the first range and the determined angle by acquiring a projectile drop value corresponding to the first range and modifying the projectile drop value utilizing the determined angle. The projectile drop value corresponds to the amount of vertical projectile drop at a particular range and at zero angle. Similarly, thecomputing element16 may acquire a plurality of projectile drop values and modify the plurality of projectile drop values utilizing the acquired angle to determine hold over values accordingly.
• Thecomputing element16 may acquire the projectile drop value from thememory18. For instance, as described above, thememory18 may include a database of ballistic information, including a listing, table, chart, etc, of projectile drop values corresponding to various ranges and configuration information. For instance, the database may include data corresponding to the chart ofFIG. 9 to enable the retrieval of a projectile drop value, in minutes of angle (MOA), inches, yards, centimeters, reticle positions, etc, based upon the first range.
• Preferably, the projectile drop value is retrieved utilizing both the first range and the configuration information. For instance, as is shown inFIG. 9, the projectile drop value may be dependent upon the particular projectile or firearm utilized, such that retrieving a projectile drop value corresponding to a utilized projectile facilitates accurate shooting. Thus, in embodiments where the user selects one of the plurality of ballistic curves, the projectile drop value is preferably retrieved utilizing the selected ballistic curve and the first range.
• Thecomputing element16 may also or additionally acquire the projectile drop value utilizing a look-up table or other database element. For example, the database may include an ordered listing, table, and/or relational listing of ranges, configuration information, and projectile drop values, such that the projectile drop value may be acquired by providing the range and configuration information, such as projectile curve, type, size, etc. Such data corresponding to projectile drop values, ranges, and other ballistic information is commonly available through numerous sources such as bullet manufacturers, firearm manufacturers, internet databases, textbooks, etc, and may be stored within thememory18 for retrieval by thecomputing element16 and/or to help the user in providing configuration information.
• Further, as will be appreciated by those skilled in the art, the projectile drop value may be dependent on the range at which the firearm or bow is sighted in. For instance, the chart ofFIG. 9 indicates a projectile drop value of zero at 100 yards as a firearm sighted-in at 100 yards and thus on a level surface would experience no additional drop for which compensation is required by the user.
• Thecomputing element16 may utilize a default sight-in range of 100 yards and retrieve projectile drop values accordingly and/or thecomputing element16 may utilizing a user-provided sight-in range and retrieve projectile drop values accordingly or modify a retrieved projectile drop value utilizing conventional algorithms to reflect variations in sight-in range.
• To compensate for angled projectile trajectories in determining the hold over value, thecomputing element16 is operable to utilize the angle determined by thetilt sensor14 to modify the acquired projectile drop value. As explained above and shown inFIG. 8, the projectile drop value varies according to angle. The amount of variance may be express utilizing a cosine of the acquired angle.
• Specifically, the hold over value may be determined by thecomputing element16 by multiplying the projectile drop value corresponding to the first range by the cosine of the acquired angle. The hold over value, configuration information, projectile drop values, and other data may be provided and/or displayed utilizing various units. For example, the hold over value and projectile drop values may correspond to minutes of angle, inches, centimeters, reticle positions, combinations thereof, etc. As shown inFIG. 10, the hold over value may be displayed by thedisplay30 as both a numerical value in inches, 24 inches for example, or as one or more reticles, such as a first reticle and a second reticle.
• For instance, the first reticle may be a fixed reticle that corresponds to the sight-in range while the second reticle may be a dynamically-displayed reticle that reflects changes to the first reticle based upon the determined hold over value. The hold over value may also refer to one or more reticles on the user's riflescope, such as the number of dots on the a reticle that the user must aim high.
• Further, the information presented on thedisplay30 may be dependent upon the first range to the target T. Specifically, in situations where the first range is less than 100 yards, the first and second ranges may be displayed, but not the hold over value or angle, as the second range, representing true horizontal distance, is often more important for short-range accuracy than hold over information. For instance, when thedevice10 is in bowhunting mode thedisplay30 presents the first and second ranges but not the hold over value.
• In contrast, where the second range is greater than 100 yards, the first range, the hold over value, and/or the angle may be displayed, but not the second range, as the hold over value is often more important for long-range accuracy than true horizontal distance. For instance, when thedevice10 is in firearms mode, the first range and the hold over value are preferably shown but not the second range.
• Thus, the provided bowhunting mode is preferably limited to ranges less than 100 yards and does not present an indication of the hold over value while the provided firearms mode is not limited to any particular ranges and presents an indication of the first range and the hold over value. As should be appreciated by those skilled in the art, the firearms mode may additionally be operable to calculate a hold under value utilizing the first range and the determined angle.
• Although the invention has been described with reference to the preferred embodiments illustrated in the attached drawings, it is noted that equivalents may be employed and substitutions made herein without departing from the scope of the invention as recited in the claims.
• Having thus described the preferred embodiment of the invention, what is claimed as new and desired to be protected by Letters Patent includes the following:

Claims (14)

1. A method for determining hold over ballistic information, the method comprising the steps of:

determining a first range to a target;

determining an angle to the target; and

determining a hold over value based on the first range and the determined angle by acquiring a projectile drop value and modifying the projectile drop value utilizing the determined angle.

2. The method as set forth inclaim 1, wherein the hold over value is determined by multiplying the acquired projectile drop value by the cosine of the acquired angle.

3. The method as set forth inclaim 1, further including determining a second range to the target by multiplying the first range by the cosine of the acquired angle.

4. The method as set forth inclaim 1, further including acquiring configuration information and determining the hold over value based upon the first range, the determined angle, and the configuration information.

5. The method as set forth inclaim 4, wherein the configuration information includes one of a plurality of ballistic curves.

6. The method as set forth inclaim 5, wherein each ballistic curve corresponds to a ballistic curves of a projectile.

7. The method as set forth inclaim 5, wherein each ballistic curve corresponds to a ballistic curves of a firearm.

8. The method as set forth inclaim 4, wherein the configuration information includes a sight-in range.

9. A method for determining hold over ballistic information, the method comprising the steps of:

acquiring configuration information;

determining a first range to a target;

determining an angle to the target; and

determining a hold overvalue based on the first range, the determined angle and configuration information by acquiring a first drop value and modifying the first drop value utilizing the determined angle and a second drop value

wherein the configuration information corresponds to one of a plurality of ballistic curves and a sight-in range.

10. The method as set forth inclaim 9, wherein the hold over value is determined by multiplying the acquired projectile drop value by the cosine of the acquired angle.

11. The method as set forth inclaim 9, further including determining a second range to the target by multiplying the first range by the cosine of the acquired angle.

13. The method as set forth inclaim 9, wherein each ballistic curve corresponds to a ballistic curves of a projectile.

14. The method as set forth inclaim 9, wherein each ballistic curve corresponds to a ballistic curves of a firearm.

15. The method as set forth inclaim 9, wherein the second drop value corresponds to the drop value of the ballistic curve at the sight-in range.

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