JPS6088379A - Direction detecting apparatus - Google Patents

Abstract

PURPOSE:To make it possible to detect the existing direction of a target on the basis of two transmission points being reference points, by receiving reflected waves of transmission waves from two transmission points to calculate intermediate frequency difference converted from center frequency. CONSTITUTION:Transmission waves different in center frequency are emitted from two transmission points respectively having a distance (a) from a receiving point 7 and the reflected waves from a target 20 are supplied to receivers 10, 15 through an antenna 19 and a branch circuit 9. The center frequency of each receiving signal is converted to intermediate frequency through local oscillation output and the intermediate frequency difference of a function in a target direction through a mixer 13 and the existing direction of a target on the basis of the transmission points is detected.

Description

Translated fromJapanese

【発明の詳細な説明】この発明は、電波等の波動を放射する２基準点からの伝
搬路差を利用した方向検出装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a direction detection device that utilizes a propagation path difference from two reference points that radiate waves such as radio waves.

従来、これに傾似した方向検出装置として、２つの送信
点を端準点とした受信点の方向検出装置が仰られている
。（方向検出装置、特許出願番号５７−０２９２２３　
）この方向検出装置直は、あくまでも、受信点自身が２
つの送信点を基準点としてどのような方向に存在するか
を受信点の位置で知るものである。Conventionally, as a direction detecting device similar to this, a receiving point direction detecting device using two transmitting points as reference points has been proposed. (Direction detection device, patent application number 57-029223
) This direction detecting device is only used when the receiving point itself is 2.
The position of the receiving point can be used to determine the direction in which the receiving point is located using the two transmitting points as reference points.

本発明は、前記公知技術と異なり、２つの送信点から放
射された・−波等の目標による反射波を受信することに
より、目標の２つの送信点を基準点とする存在方向を知
ろうとするものである。Unlike the above-mentioned known technology, the present invention attempts to know the direction of existence of a target with two transmission points as reference points by receiving reflected waves from the target, such as waves emitted from two transmission points. It is something.

本発明は、中心周波数の異る線形ＦＭ信号を放射する２
つの送信点を基準点とした方向検出装置において、放射
された２つの線形ＦＭ信号は目標に反射され、その反射
波（２波）を受信アンテナで受信し、さらに、受信した
信号を予め定めた２つの中心周波数の中間周波信号に変
換し、その両信号間の差周波数をもとめることにより、
目標の方向の情報を周波数の情報として得る。The present invention emits two linear FM signals with different center frequencies.
In a direction detection device that uses one transmission point as a reference point, two emitted linear FM signals are reflected by a target, the reflected waves (two waves) are received by a receiving antenna, and the received signals are By converting the two center frequencies into intermediate frequency signals and finding the difference frequency between the two signals,
Information on the direction of the target is obtained as frequency information.

次に１本発明の実施例について図面を参照して説明する
。Next, an embodiment of the present invention will be described with reference to the drawings.

Ｑ（、１図において、送信器２で発生された送信信号３
．４はアンテナ５，６から放射される。アンテナ５．６
から放射された送信信号は１点２０にある目標により反
射された後１点ｌにある受信装置により受信される。關
２図に受信装置を示す。Q(, In Figure 1, the transmitted signal 3 generated by the transmitter 2
．． 4 is radiated from antennas 5 and 6. antenna 5.6
The transmission signal radiated from is reflected by a target at a point 20 and then received by a receiving device at a point l. Figure 2 shows the receiving device.

第２図のアンテナ１９で受信された受信信号は分岐回路
９で二分され受信器１０．１１の入力となる。受信器ｉ
ｏ、ｉｉは信号１４．１５を局発入力として、中間周波
信号１６．１７に発生する。The received signal received by antenna 19 in FIG. 2 is divided into two by branch circuit 9 and input to receiver 10.11. receiver i
o and ii are generated as an intermediate frequency signal 16.17 using the signal 14.15 as a local input.

中間周波信号１６．１７はミクサ１３に入力され。The intermediate frequency signals 16 and 17 are input to the mixer 13.

その差周波信号１８が取出される。The difference frequency signal 18 is extracted.

第３図に中心周波数Ｆｌの送信信号４（第１図）と中心
周波数Ｆ２の送信信号３（第１図）を示す。FIG. 3 shows a transmission signal 4 (FIG. 1) with a center frequency Fl and a transmission signal 3 (FIG. 1) with a center frequency F2.

アンテナｌ　９　（第２図）に受信される信号は、第３
図のＦｌ、Ｆ’２と比較して、電波の伝搬時間ｔｌおよ
びＡ２だけ遅れており、それを第４図に示す。また、４
２図の中間周波信号１６．１７を第５図にＩＰ、、ＩＰ
２として、第２図のミクサ出力１８を、１）ｌ”ｌとし
て、第６図に示す。The signal received by antenna l 9 (Fig. 2) is
Compared to Fl and F'2 in the figure, it is delayed by the radio wave propagation time tl and A2, which is shown in FIG. Also, 4
The intermediate frequency signals 16 and 17 in Figure 2 are shown as IP, , IP in Figure 5.
2, the mixer output 18 in FIG. 2 is shown in FIG. 6 as 1) l''l.

第１図において、目標２０がアンテナ５および６を結ぶ
線を垂直に２等分する向上７，８にあれは、ミクサ１３
　（ｍ２図）の出力の差周波信号１８（化２図）　ｖｉ
ｓ　Ｄ”　２　（ｍ６図）となり、第１図に示すように
、目標２０が１面７，８より上方にあるよきは、差周波
信号１８は＆　ｌ）”　五（第６図）となり、Ｄｌｉ”
２より大きい。目標２０が面７，８より下方にあるとき
は、差周波ｌぎ号１８は、ＤＦ２より小さくなる。従っ
て、差周波信号１８は、目標２０のアンテナ５，６から
見た方向の情報を周波数情報として持つことがわかる。In FIG. 1, the target 20 is located at the heights 7 and 8 that vertically bisect the line connecting the antennas 5 and 6.
Difference frequency signal 18 (Figure 2) of the output of (Figure m2) vi
s D" 2 (Fig. m6), and as shown in Fig. 1, when the target 20 is above the first plane 7 and 8, the difference frequency signal 18 becomes &l)" 5 (Fig. 6), “Dli”
Greater than 2. When the target 20 is below the planes 7, 8, the difference frequency 18 will be smaller than DF2. Therefore, it can be seen that the difference frequency signal 18 has information on the direction viewed from the antennas 5 and 6 of the target 20 as frequency information.

なお、第１図に示すように、アンテナ５および６から放
射される。襖形り″Ｍ信号の帯域幅をｆ　７ｎ。Note that, as shown in FIG. 1, the radiation is radiated from antennas 5 and 6. The bandwidth of the fusuma-shaped M signal is f7n.

持続時１１ｊをＴｏとし。When it lasts, 11j is To.

第１図において、目標２０とアンテナ５および６との距
離を、それぞ′れｔ、、１２，１４票２０と点７との距
離ｋｒｓ線分１，７が而７．８となす角θ、線分７，５
および７，６の長さをａ、光速をＣとすれば、差周波信
号１８の周波数Ｌ）ＩＩ″ｌは次のようになる。In FIG. 1, the distances between the target 20 and the antennas 5 and 6 are t, 12 and 14, respectively, and the angle θ between the distance krs line segments 1 and 7 and the distance 7.8 between the vote 20 and the point 7 is 7.8. , line segment 7,5
If the length of 7 and 6 is a, and the speed of light is C, then the frequency L)II''l of the difference frequency signal 18 is as follows.

ＤＦ　１　＝（ｆｍｌ′１″ｏ）（Ａ２−４ｘ）／Ｃ＋
（ＩＦＩ−ＩＰ２）　（１１ｔ２−ｔ１＝ｒ　（１＋２
ａ　ｓｉｎθ／　ｒ　十ａ　２７ｒ２　）　Ｉ／２−ｒ
　（１−２ａ　ｓｉｎθ／　ｒ　＋　ａ　２／ｒ　２）
　”　（２）ａがｒと比べて十分小さいときはＡ２−１ｌ＝　２　ａ　ｓｉｎθ　（３）となり、更に
（３）式においで、θが十分小さいときはＡ２−１１＝２ａＯとなる。式（１）から（４）でわかる通り１本発明は角
度を計測する場合も有効である。DF 1 = (fml'1''o) (A2-4x)/C+
(IFI-IP2) (11t2-t1=r (1+2
a sinθ/r 10a 27r2) I/2-r
(1-2a sin θ/r + a 2/r 2)
” (2) When a is sufficiently small compared to r, A2-1l = 2 a sin θ (3), and furthermore, in equation (3), when θ is sufficiently small, A2-11 = 2aO.Equation ( As can be seen from 1) to (4), the present invention is also effective when measuring angles.

この発明は以上説明したように、態形ＦＭ信号を利用し
た方向検出装置において、２つの送信点から放射される
中心周波数の異る線形ＦＭ信号を目標で反射させ、その
反射波を受信し、その受信信号の差周波数を検出するこ
とにより、目標が送（Ｍ点からどの方向にあるかを検出
することができる効果がある。As explained above, the present invention is a direction detection device using a morphological FM signal, in which linear FM signals having different center frequencies emitted from two transmission points are reflected at a target, and the reflected waves are received. By detecting the difference frequency of the received signals, it is possible to detect in which direction the target is located from the transmission point (M point).

【図面の簡単な説明】[Brief explanation of drawings]

第１図および第２図は本発明の１実施例のブロック図、
第３図〜第６図は本発明の詳細な説明す１・・・・・・
受信装置、２・・・・・・線形ＦＩＶ伯号信号１ｄ器、
３．４・・・・・・送信浪ｉｊ形Ｆ’Ｍ信号、５，６・
・・・・・アンテナ、７・・・・・・アンテナ５．６を
結ぶ牌の２等分点。８・・・・・点７ｔ−含み線分５，６に垂直な面上の一
つの直線、９・・・・・・分岐回路、１０．１１・・・
・・・受Ｇｉ’ｊ＋’：ｓ１２・・・・・・局部発振器
、１３・・・・・・ミクサ、１４．１５・・・・・・局
発信号、１６．１７・・・・・・中間周波１ｇ号、１８
・・・・・・差周波信号、１９・・・・・・受信アンテ
ナ、２ｏ・・・・・・目標。代理人　弁理士　内　原　皿　：′ｓ、パ、　′′５．．）１／第　２図1 and 2 are block diagrams of one embodiment of the present invention,
Figures 3 to 6 provide detailed explanations of the present invention.
Receiving device, 2... Linear FIV signal 1d device,
3.4...Transmission wave ij type F'M signal, 5, 6...
...Antenna, 7...The bisecting point of the tile connecting antenna 5.6. 8... Point 7t - one straight line on the plane perpendicular to the included line segments 5 and 6, 9... Branch circuit, 10.11...
...Reception Gi'j+': s12...Local oscillator, 13...Mixer, 14.15...Local oscillation signal, 16.17... Intermediate frequency 1g, 18
...Difference frequency signal, 19...Receiving antenna, 2o...Target. Agent Patent Attorney Sara Uchihara:'s, pa,''5. ．． ) 1/ Figure 2

Claims (1)

Translated fromJapanese

【特許請求の範囲】[Claims]中心周波数の異る線形ＦＭ信号を放射する２つの送信点
を基準点とした目標の存在方向を検出する装置において
、目標により反射された前記２つの脚形１”Ｍｌぎ号を
受信する手段と、受信した各１６号を予め定めた２つの
中心周波数の中間周波信号に変換する手段と、この中間
周波信号間の周波数点をとる手段とを備えてなることを
特徴とする方向検出装置。In a device for detecting the direction of a target with reference points being two transmission points that emit linear FM signals having different center frequencies, means for receiving the two leg-shaped signals reflected by the target; , means for converting each of the received No. 16 signals into intermediate frequency signals having two predetermined center frequencies, and means for taking a frequency point between the intermediate frequency signals.