GPS service performance accurate release simulation and display systemTechnical Field
The invention belongs to the technical field of satellite navigation countermeasure simulation and situation display, and particularly relates to a GPS service performance accurate release simulation and display system.
Background
The satellite navigation system can provide a unified space-time reference for systematic combat, is an important battlefield guarantee resource in combined combat, has become an important component of intelligent combat, and one of the development trends of navigation combat scenes is precise release of navigation performance, heterogeneous backup of constellation and global hotspot maneuver, and is mainly characterized by intelligent navigation signals and flexible activation of war district augmentation. The precise release of the navigation performance refers to the precise release of the navigation service performance of the satellite in any global area by adjusting the serial operations of the beam angle, the scanning angle, the beam power and the like of the visible satellite at a certain moment according to the navigation power enhancement requirement and the ground anti-interference requirement of a ground designated area.
In the current battlefield environmental situation awareness system, the simulation aiming at the navigation countermeasure is mainly concentrated in the simulation and visualization of space segment constellation, network segment links, ground segment ground stations, user segment reception and the like, the system without related situation expression carries out simulation and visualization display on the process of accurately releasing the navigation performance aiming at the new development trend of the navigation countermeasure, the invention provides a GPS performance accurate release situation display system based on three-dimensional digital earth aiming at the characteristics of various types of entity elements involved in the navigation performance accurate release scene, real-time dynamic change of the positions of all elements and complex and changeable surrounding environment,
Disclosure of Invention
In view of the above, the invention provides a GPS service performance accurate release simulation and display system, which can solve the problems of simulation and situation display of a satellite navigation service performance accurate release process in a new navigation countermeasure battle method, and provides a situation display means for battlefield environment guarantee of navigation battle.
The technical scheme for realizing the invention is as follows:
a GPS service performance accurate release simulation and display system comprises a GPS navigation constellation simulation and display module, a service performance release control module, a ground navigation signal situation display module and a regional navigation service performance situation display module.
The GPS navigation constellation simulation and display module completes constellation layout and beam simulation of the space navigation satellite, generates navigation parameter data at any moment, and displays orbit parameters, beam angles, scanning angles, power, beam action areas, coverage areas and space precision service performances on the three-dimensional digital earth.
The GPS navigation constellation simulation and display module is used for completing the generation of performance release control instructions such as beam adjustment, power enhancement and the like of satellites according to the required navigation performance requirements. The navigation performance requirement comes from the requirements of a user on specific time, satellite navigation signal power enhancement and ground interference resistance of a designated area, and the selection of the central point and the range of the designated area and the simulation input of the interference intensity are completed based on the area selection function of the three-dimensional digital area.
And the ground received navigation signal quality calculation and display module completes real-time simulation and situation display of the equivalent carrier-to-noise ratio of the three-dimensional earth. Under the condition of accurate release of space satellite performance, the carrier-to-noise ratio of signals received by a ground receiver is calculated, and the carrier-to-noise ratio is displayed on three-dimensional digital earth in a grid thermodynamic diagram mode.
And the regional navigation service performance situation display module completes real-time simulation and display of the ground navigation service precision and the service quality in a specific region based on the three-dimensional live-action map. The three-dimensional live-action map is imported as a local map in a digital region, and navigation service performance is converted into DOP values through space analysis and projected on the live-action three-dimensional map, so that the navigation service performance situation in a designated area is obtained.
The invention adopts a C/S architecture to complete situation display development on the digital earth.
The beneficial effects are that:
1. the GPS performance is precisely released, and the GPS performance simulation method is suitable for battlefield situation simulation deduction and visualization operation of navigation battlefields.
2. The invention can simulate the accurate release process of the navigation constellation service performance on the basis of digital earth, and visually display the ground service performance situation.
3. The invention can provide situation display means for battlefield environment guarantee of navigation battlefield in a new navigation countermeasure battlefield method.
Drawings
Fig. 1 is a block diagram of a three-dimensional digital earth-based GPS performance accurate release situation display system according to the present invention.
Fig. 2 is a basic flow chart for precisely releasing the performance of the GPS satellite according to the present invention.
FIG. 3 is an exploded view of a GPS performance accurate release situation display task of the present invention.
FIG. 4 is a schematic diagram of a GPS performance accuracy release exemplary symbol of the present invention.
Detailed Description
The invention will now be described in detail by way of example with reference to the accompanying drawings.
The invention provides a GPS service performance accurate release simulation and display system, which comprises the following specific implementation steps:
Referring to fig. 1, the service flow of the present invention is to first determine an area needing navigation elastic service at a certain moment and a performance enhancing value, taking GPS M code as an example, calculate T moment by system simulation, designate an area (assuming center P (X, Y) and radius R) needing power enhancement 15DB, then first calculate a visible satellite at the T moment of the area, perform performance accurate release by using the satellite, simulate the earth center angle covered by satellite wave beam, and the specific formula is
Where ηmax is the scan angle of the spot beam signal and α is the signal half-beam angle.
The satellite constellation, beams, are shown on the digital earth with beam coverage from a spatial perspective.
The quality of the ground received navigation signal is expressed by an equivalent carrier-to-noise ratio under the condition that the ground received navigation signal quality calculation and display module calculates new service performance parameters in a simulation mode, and a specific calculation formula is adopted
The service precision of the landing signal is calculated in a simulation mode, DOP value expression is utilized, a specific calculation formula is utilized, then grid persons of the ground DOP are projected to a live-action three-dimensional map loaded by digital earth in a ground view angle, situation expression of precise release of navigation performance is achieved, and the whole process of precise release of the navigation performance from satellites, wave beams and ground whole elements can be traced back by utilizing a time axis.
Referring to fig. 2, the embodiment of the invention provides a system for displaying a precise release situation of GPS performance based on three-dimensional digital earth, which comprises a GPS navigation constellation simulation and display module, a service performance release control module, a ground navigation signal situation display module and a regional navigation service performance situation display module. The GPS navigation constellation simulation and display module completes constellation layout and beam simulation of the space navigation satellite to generate navigation parameter data at any moment, and the service performance release control module mainly completes performance release control instruction generation such as beam adjustment, power enhancement and the like of the satellite according to the required navigation performance requirement. And the ground received navigation signal quality calculation and display module completes real-time simulation and situation display of the equivalent carrier-to-noise ratio of the three-dimensional earth. And the regional navigation service performance situation display module completes real-time simulation and display of the ground navigation service precision and the service quality in a specific region based on the three-dimensional live-action map.
The invention is characterized in that detailed task analysis is performed aiming at situation display of a navigation accurate release scene, and detailed view is shown in figure 3, and aiming at the satellite navigation accurate release scene, according to service requirements, 1) the situation is decomposed into 3 fine display scenes, 1) satellite beam enhancement, 2) satellite beam adjustment, and 3) ground accurate service performance is realized. And establishing visual elements and decomposing scene scales aiming at the fine scenes. 2. To navigation satellite constellations, satellite beams, ground monitoring stations, geographical environments, etc. 3. And determining the expression scale, determining 3 expression scales and display elements from the space view angle and the ground view angle, and symbolizing the expression elements by utilizing a standard paid library of the three-dimensional digital earth.
The scene schematic diagram expressed by the 4 modules is shown in fig. 4, the space view angle expresses the orbit and wave beam of the satellite, and the ground view angle expresses the grid projection of DOP value under the ground coverage and real three-dimensional scene.
In summary, the above embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.