JPH0225782A - Distance measuring device - Google Patents

Abstract

PURPOSE:To obtain a distance between a target and a flying body while the flying body flies to a target by detecting the receiving power of an radiating radio wave from a radio wave radiating source, which is a purpose, and measuring the speed of the flying body. CONSTITUTION:Receiving power P(t) to be received by a flying body 1 goes to be an equation I. In the equation, a Pt is the transmitting power of the radio wave radiating source which is the purpose, a Gt is the gain of a transmitting antenna, a Gr is the gain of a receiving antenna to be obtained by the flying body, a lambda is the wavelength of a transmitting radio wave, an L is the loss of a radar system and an R(t) is a distance between the target and flying body. When a DELTAt is caused to be enough small, an output signal 28 of an arithmetic device 7 can be given with an equation II. On the other hand, an equation III is established from the equation I. Here, since the value of the equation II goes to be the distance R(t) between the target and flying body from the equation I and II, the distance between the target and flying body can be obtained from the output signal 28 of the arithmetic device 7.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention provides a method for measuring the distance between a flying object that targets a fixed or stationary radio wave radiation source such as in the air, and the distance between the target and the flying object. [Prior Art] Figure 3 is a diagram showing the principle of a conventional distance measuring device.

an is the target, 翺 is the flying object, (to) is the distance R between the target and the flying object, CI4 is the swing angle ψ formed by the aircraft axis of the flying object and the line of sight, @ is the flight at a certain point in the past. body position,
(to) is the swing angle ψ′ of the flying object at a certain point in the past
, @ is the distance d that the flying object has moved from a certain point in the past.

As shown in Figure 3, the distance R between the target and the flying object is determined as follows. R, (1, 1 for ψ and ψ′
The following formula % formula % ( holds true, so solve this formula for R.

R＝・・・・・・・・・
(2) ψ(cotψ' −cotψ). In order to determine the distance R between the target and the flying object in this way, data regarding the swing angle of the flying object at a certain point in the present and in the past is required. However, when the flying object flies toward the target, the swing angle of the flying object is equal to zero, so the distance R cannot be determined using equation (2).

[Problem to be solved by the invention]

In conventional distance measuring devices, the distance between the target and the flying object is determined as 2 or more.

In order for the neck shooting angle to have an appropriate value, the flying object must fly in a deliberate detour instead of heading towards the target! D, fL< There were problems such as restrictions on operation.

This invention was made in order to solve the above-mentioned problems, and an object of the present invention is to obtain a device for determining the distance between a target and a flying object while the flying object is flying in the direction of the target. do.

[Means to solve the problem]

In the ranging device according to the present invention, when a flying object flies toward a target, a receiver mounted on the flying object detects the received power of radio waves emitted by a target radio wave radiation source, and The speed of the flying object is measured by an on-board speed measuring device, and these values are used to determine the distance between the target and the flying object.

[Effect]

The distance measuring device according to the present invention uses the detected value of the received power of the radio waves emitted from the target iIf wave radiation resistant source and the measured value of the speed of the flying object while the flying object is flying toward the target. , the distance between the target and the projectile can be obtained.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

Figure 91 is a diagram showing the distance measuring device of the present invention, (1) is a flying object, (2) is an airborne M, +31 is a receiving section, (4) is an accelerometer that detects the aircraft axis direction, and (5) is a Integrator, (6) is a speed measuring device, (71 is a calculation device, (8I is a signal indicating the received power (denoted as P(t)), +91 is the velocity of the flying object (
v(t)), αG is a signal R(t) indicating the distance between the target and the flying object. FIG. 2 is a block diagram showing the flow of calculations performed in the calculation unit (71), where Qυ is a logarithmic conversion calculation unit, @ is a reciprocal conversion calculation unit, and c!3 applies a delay of Δt to the input signal. Delay calculator, c!4 is a signal indicating the value of delay time Δt, (C) is a signal indicating the value of 2, 翰 is received power p(t), ■ is flying object velocity v (t), (to) is the distance R(t) between the target and the flying object. In Figure 2, ■ and ■ are symbols that mean addition, subtraction, and multiplication, respectively.

First, regarding the received power p(t) received by the flying object.

The following formula holds true.

2v(t) where pt is the transmission power of the target radio wave radiation source,
Gt is the gain of the transmitting antenna, Gr is the gain of the receiving antenna of the flying object, λ is the wavelength of the transmitted radio wave, L is the loss of the radar system, and R(t) is the distance of 101 between the target and the flying object.

Next, the value of the signal (to) calculated and output by the calculation device (7) will be described. First, the value of the output signal of the reciprocal conversion calculator is K as follows.

Therefore, assuming that Δt is sufficiently small, the value of the signal in (2) is given by the quadratic formula. , (3) holds true. According to equation (3) and +131, the value of equation 5ν is R(t), so the output signal of the arithmetic unit (71)
) indicates the distance between the target and the projectile. That's all 91
It can be seen that by using the ranging device with this configuration, a signal indicating the distance between the target and the flying object can be obtained.

〔Effect of the invention〕

As described above, according to the present invention, by performing simple calculations using the received power obtained from the receiver and the flying object speed obtained from the speed measurement device, the distance between the target and the flying object is determined. distance.

To enable a flying object to search for a target while flying towards it.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a distance measuring device according to an embodiment of the present invention, FIG. 2 is a diagram showing a calculation device of the present invention, and FIG. 3 is a diagram showing the principle of a conventional distance measuring device. In the figure, (1) is a flying object,
(2) is the antenna, (3) is the receiver, (4) is the accelerometer,
(5) is an integrator, (6) is a speed measuring device, and (71 is an arithmetic device). In the drawings, the same or corresponding parts are denoted by the same reference numerals.

Claims (1)

[Claims] Receives radio waves emitted by a radio wave radiation source such as an antenna that is fixed or generally stationary compared to the speed of the flying object,
a receiver for detecting received power; a speed measuring device for measuring the speed of the flying object; the received power detected by the receiver and the speed of the flying object measured by the speed measuring device; 1. A distance measuring device comprising: a calculation device for calculating a distance between a target and a flying object.