JPH04279887A - Radar video display device - Google Patents

Abstract

PURPOSE:To display a target, the direction of which is identified, without carrying out mechanical matching by correcting the difference in a mechanical origin between each beam axis and antenna rotational axis, and an angular signal stored in a memory device, through computer. CONSTITUTION:Radar video signals 20-21 are input in video processors 5-6, and the angle when the video signals are input is detected by a reference angular signal 28, while angular signals 22-23 are temporarily stored in memory devices 7-8. A first memory data 26 and a second memory data 27 are constantly read from the devices 7-8 by a computer 9, while a directivity data 34 (the data indicating the difference in the mechanical origin of input antenna rotational axis) input from an input device 11 is added, and corrected data 29-30 are output to video generators 12-13, and correction video signals 31-32 are output to a video synthesizing device 14. A synthetic video signal 33 thus added and synthesized is output to a radar display device 15 by the device 14, and a radar video is displayed in the whole circumference.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radar video display device for a radar device in which a secondary surveillance radar antenna for identifying objects is attached to a search radar antenna for searching for objects in the air, for example.

0002

[Prior Art] Conventionally, when the beam axis of a search radar antenna and the beam axis of a secondary surveillance radar antenna do not coincide with the origin of the antenna rotation axis, the respective beams are mechanically aligned with respect to the mechanical origin of the antenna rotation axis. It was a device that matched and displayed images through manual adjustment and alignment.

0003

[Problem to be Solved by the Invention] Conventional radar video display devices use the method described above, which requires mechanical adjustment and alignment of each individual radar system, making the work complex and time-consuming. was there.

[0004] The present invention has been made to improve this problem, and addresses the deviation of the mechanical origin between the beam axis of each radar and the rotational axis of the antenna, and the angle signal and output by processing the video signal. The object of the present invention is to obtain a radar video display method in which a distance signal is input to a computer, the deviation is corrected by the computer, and the video signal is outputted, thereby making each radar video signal coincident with the mechanical origin of the antenna rotation axis.

[0005]

[Means for Solving the Problems] A radar video display device according to the present invention includes a video processing device that processes a radar video signal outputted by a radar transceiver, and stores an angle signal and a distance signal outputted by the video processing device. a storage device;
An input device that inputs the deviation between the radar beam axis and the mechanical origin of the antenna rotation axis, and correction is made based on the input deviation data and the angle data and distance data included in the stored data read from the storage device. It is equipped with a computer that controls the output of video data, a video generator that generates a video signal from the video data output by the computer, and a video synthesis device that synthesizes the video signals output from the video generator.

[0006]

[Operation] In this invention, a computer performs correction calculations on the deviation of the mechanical origin of the antenna rotation axis input from the input device (hereinafter referred to as directional data) and the angle signal stored in the storage device. Then, the computer outputs the video data corrected to the mechanical origin, which is output-controlled, to a video generator, which converts it into a video signal, combines it with a video synthesis device, and outputs the beam axis corrected radar video signal to a radar display device. to be displayed.

[0007]

[Embodiment] Fig. 1 is a block diagram showing one embodiment of the present invention, in which 1 to 2 are radar antennas, 3 to 4 are radar transceivers, 5 to 6 are video processing devices, and 7 to 8 are storage units. device, 9 a computer, 10 an antenna drive device, 11
12 to 13 are input devices, 12 to 13 are video generators, 14 is a video composition device, 15 is a radar display device, 20 to 21 are radar video signals, 22 to 23 are angle signals, 24 to 25 are distance signals, 26 is a first , 27 is second storage data, 28 is a reference angle signal, 29 is first video data, 30 is second video data, 31 to 32 are corrected video signals, 33 is a composite video signal, 34 is This is directional data.

In the radar video display device configured as described above, the radar antennas 1 and 2 are constantly rotated by the antenna driving device 10, transmitting and receiving microwave signals from the radar transceivers 3 and 4, and displaying the radar video respectively. A display is made on the radar display device 15.

Radar antennas 1 and 2 have directivity that concentrates and radiates energy in a specific direction, and this does not reach the ideal zero degree depending on the shape of the antenna, the frequency used, etc. It is off by about 1 degree. For example, if this is the directional characteristic of the two radar antennas 1 and 2 as shown in FIG. 2(a), if the radar video signals 20 and 21 are displayed on the radar display device 15 as is, the directional characteristics are as shown in FIG. 2(b). If there is a target in the zero degree direction (due north), its position will be displayed shifted and give incorrect information. For this purpose, the radar video signals 20-21 are outputted as angle signals 22-23 and distance signals 24-25 by the video processing devices 5-6, and are temporarily stored in the storage devices 7-8. Video processing devices 5 to 6 are radar video signals 20
21 is input, the angle at which the video signal is input is detected using the reference angle signal 28, and angle signals 22 to 23 are output. This operation is always performed while the radar antenna is rotating.
As shown in (d), the data is sequentially stored in the storage devices 7 to 8.

The computer 9 constantly reads the first stored data 26 and the second stored data 27 from the storage devices 7 to 8, and uses the directional data inputted from the input device 11 as the first stored data 26 and the second stored data 27. The angle data of the stored data 27 are calculated, the corrected angle is calculated, and the first video data 29 and the second video data 30 are created. When the angle matches the reference angle signal 28 input to the computer 9, the video data 29-30 are outputted to the video generators 12-13. That is, in FIG. 2(b), if the radar video signal 20 is a video signal that is a degree ahead of the reference angle signal 28, the angle signal 22 when the video signal is input is (0 degrees - a degree), When the angle 0 degree obtained by adding degree a of the directivity data 34 to this angle data matches the reference angle signal 28, the first video data 29 is outputted to the video generator 12. Similarly, radar video signal 21
is a video signal delayed by b degrees with respect to the reference angle signal 28, and the angle signal 23 when the video signal is input is (0 degrees + b degrees), and this angle data is combined with (-b degrees) of the directivity data 34. When the angle of 0 degrees obtained by adding the 0 degrees and the reference angle signal 28 match, when the first video data 30 is output to the video generator 13, a matched video display is obtained as shown in FIG. 2(c). .

As described above, the computer 9 adds the angle data and the directivity data 34 of the first stored data 26 and the second stored data 27 read from the storage devices 7 to 8, and calculates the corrected first data. The video data 29 and the second video data 30 are outputted to the video generators 12-13, and the generated corrected video signals 31-32 are outputted to the video synthesis device 14.
The composite video signal 33 that has been added and composited is output to the radar display device 15, and the radar video is displayed for the entire circumference.

[0012] Here, the explanation has been made with the mechanical origin and target position of the antenna rotation axis facing in the zero degree direction (true north). Further, in the above embodiment, the directivity deviation of the radar antennas 1 and 2 is corrected, but the time delay required for signal processing of the radar transceivers 3 and 4 may be set using the input device 11. Moreover, even one radar antenna is effective.

[0013]

As described above, according to the present invention, a video processing device detects an angle signal of a radar video signal output from a radar transceiver connected to a plurality of radar antennas whose directivity does not coincide with zero degree. Then, this is temporarily stored in a storage device, and when the reference angle signal matches the angle corrected by the computer to the radar antenna directivity data input and set from the input device and the angle data read by the computer from the storage device. The computer outputs the video data corrected for the mechanical deviation of the antenna rotation axis to a video generator to generate a corrected video signal, and displays the combined video signal synthesized by the video synthesis device and output on the radar display device. This has the effect of displaying targets with the same direction without mechanical adjustment or alignment.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is a diagram showing the operation of the present invention.

[Explanation of symbols]

1 Radar antenna 2 Radar antenna 3 Radar transceiver 4 Radar transceiver 5 Video processing device 6 Video processing device 7. Storage device 8. Storage device 9 Computer 11 Input device 12 Video generator 13 Video generator 14 Video composition device 15 Radar equipment

Claims (1)

[Claims] Claim 1: A device for displaying radar video of a radar device having a plurality of radar antennas attached to one rotating shaft, comprising: a plurality of radar transceivers respectively connected to the plurality of radar antennas; and an output of the radar transceiver. a video processing device that processes radar video signals respectively; a storage device that stores data output by the video processing device; an input device that inputs data on the directivity of each of the radar antennas; A computer that controls a video generator using data from each of the storage devices, a video generator that generates a video signal from each video data output from the computer, and a composite of the video signals output from the video generator. A radar video display device comprising: a video synthesis device; and a radar display device that displays a video signal synthesized by the video synthesis device.