JPH03220481A - Target detector - Google Patents

Abstract

PURPOSE:To accurately and quickly detect a target and determine its position even in a broad range beam electronic scanning by reading the contents of a memory for storing the presence or absence of the target in a three- dimensional space by a processor. CONSTITUTION:A video signal from a receiver 4 is A/D-converted 6, integrated 7 for every range bin and a threshold signal which changes in accordance with the magnitude of the video signal is formed in a threshold signal generating circuit 8. A target signal detecting circuit 9 compares the threshold signal with the video signal from an integration circuit 7 and a target signal from the video signal is detected. Then, one range bin corresponding to the position of a center of gravity in the distance direction of a target signal is detected by a target signal compression circuit 10, the one range bin is made correspond to one target and information on the presence or absence of the target in the distance direction is obtained. At the same time, the information is stored in a position in a memory 11 corresponding to the directional position of a transmission and reception wave at this time and three-dimensional target position data can be quickly obtained by a processor 18.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a target detection device that accurately and quickly detects a target during a search using wide beam electron scanning.

C. Prior Art] Figure 2 shows the configuration of a conventional target detection device.
In the figure, (1) is a transmitting/receiving antenna that transmits transmitted radio waves or receives received radio waves, (2) is a transmitter that generates high-frequency power pulses to be sent to (1) above, and (3) is directed to (1) above. A transmission/reception switching circuit that switches between the high-frequency power pulse to be sent and the received wave from (1) above, (4) is the above fil
]5) is a receiver that detects received waves from
This is a display type that displays the video signal from 4) in two dimensions of distance and azimuth.

In such a configuration, a high-frequency power pulse generated by the transmitter (2) passes through the transmission/reception switching circuit (3) and is radiated to the outside as a transmission radio wave via the transmission/reception antenna (1). The reflected power from the target passes through the transmitting/receiving antenna (1) as a received wave and passes through the transmitting/receiving switching circuit (3) to the receiver (
4), where the received wave is detected and turned into a video signal, which is displayed on a display (5) that displays the target in two dimensions in terms of distance and azimuth.

[Problem to be solved by the invention]

Since the conventional target detection device is configured as described above, it is possible for the operator to detect the target and determine the position during a search by wide beam electronic scanning, and to specify the target position by visual confirmation on the display and marker setting by the operator. If this is done, the target detection distance will decrease due to the integral loss in the two displays, and the error in the target position data will increase.

There were problems with increased reaction time and increased search range, which increased the operator's workload.

This invention 1 has been made to solve the above-mentioned problems, and its purpose is to accurately and quickly detect and determine the position of a target even in wide beam electron scanning.

[Means to solve the problem]

The target detection device according to the present invention digitizes a video signal obtained from a receiver using an A/D conversion circuit, integrates this digital signal for each range bin, and changes the video signal according to the size of the video signal using a target signal detection circuit. A target signal for each range bin is detected based on a threshold signal to be detected, and a target signal compression circuit detects a range bin corresponding to the center of gravity of the target from a plurality of consecutive range bins for a target signal that has a target across a plurality of consecutive range bins. - detected, and the - range bins are made to correspond to one target, and information on the presence or absence of the target in the distance direction is obtained.
Information on the presence or absence of a target is stored in a memory location corresponding to the directional position of the transmitted and received radio waves at this time, and as a result, the presence or absence of a target in three-dimensional space is stored in the memory.

[For production]

The memory in this invention is the distance made by the operator.

When specifying a target position by setting a marker on a two-dimensional azimuth display, the processor quickly reads the contents of the memory.

Moreover, it is possible to obtain three-dimensional target position data with highly accurate distance, azimuth, and elevation angle.

〔Example〕

FIG. 1 shows an embodiment of the present invention, and in FIG. 2, (1) to (5) are the same as those of the prior art described above. (6) is an A/D conversion circuit that converts the video signal from the receiver (4) into a digital signal, and (7) is this A/D conversion circuit (6).
(8) is a threshold signal generation circuit that generates a threshold signal for target detection that changes depending on the magnitude of the video signal from the video integration circuit (7); ) is a target signal detection circuit that detects a target signal from a video signal by comparing the threshold signal from this threshold signal generation circuit (8) and the video signal from the video integration circuit (7); aO) is a target signal detection circuit that detects a target signal from a video signal; A target signal compression circuit that detects the position of the center of gravity in the distance direction of the target signal from the signal detection circuit (9), (ID is a memo that stores information on the presence or absence of a target from this target signal detection circuit!J, [2) are the direction control circuits that drive the direction lights, (13a), (13b
) is an S/D conversion circuit that converts the azimuth angle synchronization signal and the elevation angle synchronization signal in the bow reference deck surface polar coordinate system from this azimuth control circuit (2) into digital signals, (2)
is a beam electronic scanning control unit for electronically scanning the transmitted and received radio waves in the direction of elevation and elevation, and this beam electronic scanning control unit (
2), the beam depression/elevation angle calculation process for obtaining the beam elevation angle synchronized with beam electronic scanning in the elevation direction; Q61 is the azimuth signal from the S/D conversion circuit (13a) and the beam elevation angle calculation process. A coordinate conversion circuit that converts the beam elevation angle signal from the beam angle into the azimuth and elevation angle of the north reference horizontal plane polar coordinate system (171 is the target signal compression circuit based on the azimuth and elevation angle from this coordinate conversion circuit (g)); Memory συ corresponding to the target position information on the presence or absence of the target from the scream
A memory control unit 1181 is a processor.

Next, the operation will be explained. (1) to (4) are equivalent to the conventional method. Video number 2 from receiver (4) is A/D
The conversion circuit (6) converts the digitized video signal into a digital signal, and the video integration circuit (7) integrates the digitized video signal for each range bin. A threshold signal that changes according to A g-product signal is detected, and the target signal compression circuit a extracts a range bin corresponding to the center of gravity of the target from a plurality of consecutive range bins for a target signal that has a target across a plurality of consecutive range bins.
Detecting the target, one range bin corresponds to one target, and information on the presence or absence of the target in the distance direction is obtained. On the other hand, in order to obtain the directional position of the transmitted and received radio waves at this time, an azimuth angle synchronization signal and an elevation angle synchronization signal in the bow reference deck surface polar coordinate system are obtained from the azimuth board control circuit. This is S/D conversion time @
(13al, (13b)), and the signal from the S/D conversion circuit (13b) is processed by the beam electronic scanning control unit (13b) to calculate the beam elevation angle.
The beam electronic scanning angles in the elevation angle direction are added to obtain the beam elevation angle synchronized with the beam electronic scanning. The beam depression/elevation angle thus obtained and the S/D conversion circuit (13)
The azimuth from a) is converted by the coordinate conversion circuit (I61) to the north reference horizontal plane polar coordinate system, which becomes the directional position of the transmitting and receiving radio waves. Information on the presence or absence of a target in the distance direction from the target is stored in a position in the memory 0D corresponding to its azimuth and elevation angle, and as a result, the presence or absence of a target in three-dimensional space is stored in the memory aD.Display The display (5) displays the distance and azimuth from the contents of the memory 0D.
When a marker is set at the target position above, the processor decoy extracts the distance set by the marker from the contents of memory 0D,
It is possible to read all the elevation angle directions including the vicinity of the azimuth angle and the marker position, and quickly obtain accurate three-dimensional target position data in terms of distance, azimuth angle, and elevation angle within the read range.

〔Effect of the invention〕

As described above, according to the present invention, a memory is provided for storing the presence or absence of a target in three-dimensional space.

Target detection and position determination during search using wide beam electronic scanning! When specifying a target position by visual recognition on a display word by placement and by setting a marker, accurate target position data can be quickly obtained by reading the contents of the memory with a processor.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram showing a conventional target detection device. In Figure D, (1) is a transmitting and receiving antenna, (2) is a transmitter, (3) is a transmitting and receiving switching circuit, (4) is a receiver, and (5) is a transmitting and receiving antenna.
is a display, (6) is an A/D conversion circuit, (7) is a video integration circuit, (8) is a threshold signal generation circuit, (9)
is the target signal detection circuit, αω is the target signal compression circuit, and αD is a memo! J, 02) is the compass fli! I wholesale circuit, (13
a) and (13b) are S/D conversion circuits. (2) is a beam electronic scanning control section, Q51 is a beam elevation angle calculation process, (g) is a coordinate conversion circuit with two memory control sections, and Q81 is a processor. Note that in the two figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] In a target detection device that searches and detects targets using radar signals, there is a transmitting/receiving antenna that transmits transmitted radio waves or receives received radio waves, a transmitter that generates high-frequency power pulses, and a transmit/receive switch that switches between high-frequency power pulses and received waves. a receiver for detecting waves received from the antenna; an A/D conversion circuit for converting the video signal from the receiver into a digital signal; and a video integration circuit for integrating the video signal from the A/D conversion circuit. a threshold signal generation circuit that generates a threshold signal for target detection that changes depending on the magnitude of the video signal from the video integration circuit; and a threshold signal generation circuit that generates a threshold signal from the threshold signal generation circuit and the video integration circuit. a target signal detection circuit that detects a target by comparing it with a video signal; a target signal compression circuit that detects the center of gravity position of the target signal from the target signal detection circuit in the distance direction; and a compass control that drives the compass. circuit, an S/D conversion circuit that converts the azimuth angle synchronization signal and the elevation angle synchronization signal in the bow reference deck plane polar coordinate system from the azimuth board control circuit into digital signals, and controls the beam electronic scanning in the elevation angle direction. a beam electronic scanning control unit to perform beam electronic scanning, a beam elevation angle calculation process for obtaining a beam elevation angle synchronized with the beam electronic scanning in the elevation angle direction, and an azimuth angle signal from the S/D conversion circuit and the beam elevation angle calculation process. A coordinate conversion circuit that converts the beam elevation angle signal from the above into the azimuth and elevation angle of the north reference horizontal plane polar coordinate system, and the presence or absence of a target from the target signal compression circuit based on the azimuth and elevation angle from the coordinate conversion circuit. a memory control unit that stores information on a memory location corresponding to the target position; a memory that stores information on the presence or absence of a target; a display that displays the target in two dimensions in terms of distance and azimuth; 1. A target detection device that detects a target using a processor that reads the contents of a memory that stores information on the target.