JPH04252981A - Rader azimuth angle signal output apparatus - Google Patents

Abstract

PURPOSE:To set an azimuth angle easily in a short time by computing a deviation between an absolute bearings and a relative bearings of an antenna at a fixed state thereof to correct the relative bearings of the antena at a turning state based on the deviation. CONSTITUTION:An antenna is fixed in an optional direction and when a bearings setting switch 32 is conducted, a turning angle signal thetai as detected with turning angle detector 1 at a fixed state of the antenna and an azimuth angle signal psias detected with a bearings detector 2 are inputted into a subtracter 31 of a bearings corrector 3. The subtracter 31 computs a difference between the bearings signal psi and the turning angle signal thetai to stoke a deviation (psi-thetai) as results of the computation into a memory 33. Thereafter, when the switch 32 is turned OFF to turn the antenna, the turning angle detector 1 detects an angle of turning of the antenna and outputs a turning angle signal theta exhibiting the angle of turning to an adder 34. The adder 34 adds the deviation (psi-thetai) stored in the memory 33 to the turning angle signal theta and outputs an azimuth angle signal (theta+psi-thetai) thereby enabling the setting of an azimuth angle in a short time.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radar azimuth signal output device, and more particularly to a radar azimuth signal output device that allows easy azimuth setting in a short time.

0002

[Prior Art] When using a radar device, an azimuth angle is used to match the azimuth where a reflecting object actually exists with the azimuth of a received signal from the reflecting object displayed on the indicator of the radar device. Settings are required. For example, if a reflecting object exists at an azimuth of 270 degrees as seen from the radar device, the azimuth angle must be set so that the direction in which the received signal from the reflecting object is displayed on the indicator is also 270 degrees.

Generally, this azimuth angle setting is based on the difference between the azimuth displayed on the indicator and the original azimuth of a fixed target such as a mountain or a reflective object existing in a known azimuth such as solar radio waves. This is done by correcting a rotational reference signal (hereinafter referred to as the north signal) that is generated once in an arbitrary fixed direction during one rotation of the antenna of the radar device.

FIG. 2 shows a block diagram of a conventional radar azimuth signal output device that uses solar radio waves to set the azimuth.

In the figure, reference numeral 11 denotes an antenna transceiver, which transmits pulse waves at regular intervals in a 360° direction centered on the installation position of the radar device using an antenna system with good directivity, and detects the reflection from the target object. It receives a signal and outputs a received signal representing the distance to the target object. At this time, in order to indicate the azimuth of the pulse wave output by the antenna system, the antenna transmitter/receiver 11 outputs a north signal when the pulse wave transmission direction becomes a fixed azimuth, and A turning angle signal is output every time the wave transmission direction changes by a predetermined angle.

The north signal and the turning angle signal are input to an azimuth signal correction circuit 12, and the azimuth signal correction circuit 12 corrects the input timing of the north signal according to a separately input correction value. The north signal and the turning angle signal are output to the indicator 13.

The indicator 13 receives the north signal and the turning angle signal, and also receives a video signal output from the radar video signal conversion circuit 14 based on the received signal. Reference numeral 13 displays the presence or absence of a target object on a circular display section based on the video signal, the north signal, and the turning angle signal. That is, the indicator 13 displays an image represented by a video signal on the display section in the direction represented by the north signal and the turning angle signal.
Displays the presence or absence of a target object by distance and direction.

In such a conventional radar device, the azimuth angle is set as follows. First, since the echo of solar radio waves is displayed on the indicator 13, the indicator 13 can be visually checked.
Measure the direction of solar radio waves above. Next, the actual azimuth of the solar radio waves is calculated, and the difference between the calculated azimuth of the solar radio waves and the azimuth of the solar radio waves on the indicator 13 is determined and set as a correction value for the azimuth signal correction circuit 12. do. Thereafter, the azimuth signal correction circuit 12 corrects the north signal according to the set correction value, so that the target object is displayed on the indicator 13 in its original direction.

[0009]

SUMMARY OF THE INVENTION The conventional radar azimuth signal output device described above has the following problems. ■When using solar radio waves, settings cannot be made at night. ■When using a fixed target, setting is difficult and takes a long time when the installation location changes, such as with a mobile radar.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a radar azimuth angle signal output device that can easily set an azimuth angle in a short time.

[0011]

[Means for Solving the Problems] In order to achieve the above object, the invention according to the first claim is a radar azimuth signal output device for outputting an azimuth signal of an antenna in a radar device, which Relative azimuth detection means for detecting an output azimuth of the antenna relative to a fixed part; and absolute azimuth detection means for detecting an absolute azimuth of the antenna with respect to a reference azimuth while the output azimuth of the antenna is fixed. Azimuth deviation detection means for detecting a deviation between the relative azimuth and the absolute azimuth in a state where the output azimuth of the antenna is fixed, and correcting the relative azimuth based on the detected deviation of the azimuth. The configuration includes an azimuth angle correcting means for adjusting the output azimuth of the antenna.

[0012] Furthermore, the invention according to the second claim is the radar azimuth angle signal output device according to claim 1, wherein the absolute azimuth angle detection means is provided with a gyro for detecting the rotational direction of the earth. be.

[0013]

[Operation] In the invention according to claim 1 configured as described above, the relative azimuth detecting means detects the relative output azimuth of the antenna with respect to the fixed part in the radar device, and the absolute azimuth detecting means detects the relative output azimuth of the antenna with respect to the fixed part of the radar device. The absolute azimuth of the antenna with respect to the reference azimuth is detected with the output azimuth of the antenna fixed, and the azimuth deviation detection means detects the deviation between the relative azimuth and the absolute azimuth with the output azimuth of the antenna fixed. When detected, the azimuth correcting means corrects the relative azimuth based on the detected deviation of the azimuth, and sets it as the output azimuth of the antenna.

Further, in the invention according to claim 2 configured as described above, when the absolute azimuth detecting means detects the absolute azimuth of the antenna with respect to the reference azimuth with the output azimuth of the antenna fixed. , the absolute azimuth is detected by a gyro that detects the rotational direction of the earth.

[0015]

Embodiments Hereinafter, embodiments of the present invention will be explained based on the drawings. FIG. 1 is a block diagram of a radar azimuth signal output device according to an embodiment of the present invention.

In the figure, reference numeral 1 denotes a turning angle detector for detecting the relative rotation angle of the antenna, which detects the rotation angle of the transmitting antenna in the antenna system and outputs a turning angle signal θ representing the same rotation angle. .

On the other hand, reference numeral 2 denotes an azimuth detector 2 for detecting an absolute azimuth, which has a built-in gyro to detect the rotation of the earth and detect the angle with respect to true north. Note that since the radar device uses the magnetic north as a reference, the deviation of the magnetic north from the true north is preset, and the azimuth detector 2 outputs the azimuth signal ψ with respect to the magnetic north.

Next, reference numeral 3 is an azimuth corrector, which includes a subtracter 31 that calculates the difference between the turning angle signal θ and the azimuth signal ψ, and allows input of the turning angle signal θ and the azimuth signal ψ to the subtracter 31. and an azimuth setting switch 32 that turns on/off the azimuth setting without permission; a memory 33 that stores the difference between the turning angle signal θ and the azimuth signal ψ calculated by the subtractor 31; It includes an adder 34 that adds the difference between the turning angle signal θ and the azimuth signal ψ and the turning angle signal θ detected by the turning angle detector 1.

Next, the operation of this embodiment having the above configuration will be explained. The azimuth angle is set as follows. first,
The antenna is fixed in an arbitrary direction, and the direction setting switch 32 is turned on. When the azimuth setting switch 32 is turned on, the turning angle signal θi detected by the turning angle detector 1 in the fixed state and the azimuth signal ψ detected by the azimuth detector 2 are input to the subtracter 31 of the azimuth corrector 3. .

The subtracter 31 calculates the difference between the azimuth signal ψ and the turning angle signal θi, and calculates the deviation of the calculation result (ψ−θi
) is stored in the memory 33.

After that, when the azimuth setting switch 32 is turned off and the antenna is rotated, the turning angle detector 1 detects the turning angle of the antenna and outputs a turning angle signal θ representing the turning angle to the adder 34. do. The adder 34 adds the deviation (ψ-θi) stored in the memory 33 to the turning angle signal θ and outputs an azimuth signal (θ+ψ-θi) to an indicator (not shown).

[0022] Thereafter, the indicator displays an image of the video signal converted based on the received signal in the azimuth represented by the same azimuth signal.

[0023]

As explained above, the present invention detects the absolute azimuth of the antenna in a fixed state, calculates the deviation from the relative azimuth of the antenna, and, based on the deviation, calculates the absolute azimuth of the antenna in the normal turning state. A radar azimuth signal output device that corrects the relative azimuth of the antenna and allows you to easily set the azimuth in a short time, even at night when solar radio waves cannot be used, or even on mobile radar devices where fixed targets cannot be used. can be provided.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a radar azimuth signal output device according to an embodiment of the present invention.

FIG. 2 is a block diagram of a conventional radar azimuth signal output device.

[Explanation of symbols]

1...Turning angle detector 2... Direction detector 3... Orientation corrector 31...Subtractor 32... Orientation setting switch 33...Memory 34... Adder

Claims (2)

[Claims] 1. A radar azimuth signal output device for outputting an azimuth signal of an antenna in a radar device, comprising relative azimuth detection means for detecting a relative output azimuth of the antenna with respect to a fixed part in the radar device; Absolute azimuth detection means for detecting the absolute azimuth of the antenna with respect to a reference azimuth while the output azimuth of the antenna is fixed, and the deviation between the relative azimuth and the absolute azimuth when the output azimuth of the antenna is fixed. and azimuth correction means for correcting the relative azimuth based on the detected azimuth deviation to obtain the output azimuth of the antenna. Azimuth signal output device. 2. The radar azimuth signal output device according to claim 1, wherein the absolute azimuth detection means includes a gyro for detecting the rotational direction of the earth. Signal output device.