JP2715728B2 - Decoded video transmission equipment for secondary surveillance radar - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

Relates de coded video transmission device of the present invention is a secondary surveillance radar BACKGROUND OF relates de coded video transmission device for a secondary surveillance radar which aimed to bandwidth compression in particular digital processing de-coded video.

[0002]

2. Description of the Related Art Conventionally, this type of secondary surveillance radar is shown in FIG.
As shown in (b), radar echoes from multiple aircraft
And identification of specific aircraft, and flight altitude and bearing information
Secondary surveillance radar transmission / reception using code pulses from above
Remote transmission end for transmitting digital data to the unit (not shown)
End 20. Note that the remote transmission terminal 20 has a secondary monitoring level.
Transmission synchronized with radar pulses sent from the radar transceiver
Synchronized with the signal trigger 8 and the rotation of the radar antenna of the transmitting / receiving section
The transmitted angle signal 9 is transmitted. Further, the remote transmission terminal 20
Digital video signal which is digital data output from
Amplifying the digital video signal
The video 25 corresponding to the decoded and radar echo will be described later.
A decoder that outputs symbol information 26 including an identification code
Input the symbol 22 and the symbol information 26 and display the
And a symbol display section 23 for converting into a display signal such as a character.
ing. Further, the display unit 23 displays the CRT display 100.
I want to synchronize with the transmission trigger 8 and the angle signal 9
Perform a loose PPI display. An example of the display is shown in FIG.
C / S video 101, SELECT video 102, I
Multiple D-video 103 and emergency video 104
CRT display 100 as information from individual aircraft
Will be displayed. The structure and configuration of these secondary monitoring radars
And the above four videos are, for example, edited by the IEICE.
Disclosed on pages 247 to 249 of radar technology.
ing.

[0003] The decoded video of the secondary surveillance radar is a video obtained as a result of receiving and decoding a signal responded by a flying aircraft to an interrogation signal from a transmitter at a ground facility. As shown in FIG. 3, the C.S.
/ S) video 101, select video 102, eye day (ID) video 103, and emergency (EMERGENCY) video 104 are displayed. The aircraft responding to the interrogation signal is controlled using these four types of video.

[0004] C / S video 101 shows all aircraft that have responded to queries from the ground. The SELECT video 102 shows an aircraft having the selected code when a code is selected from the responding aircraft, particularly on the control side. The ID video 103 is a video of an aircraft further specified from the selected aircraft. EMER
The GENCY video 104 indicates that the aircraft has experienced an abnormal situation.

[0005] Therefore, in order to digitally transmit these four types of video to a remote location, control must be performed unless the pulse width and pulse train interval of each video are faithfully transmitted. Furthermore, since the distance information of the aircraft to be controlled is also important, it is necessary to increase the distance resolution of the video.

[0006]

When the above-mentioned decoded video is digitally transmitted, the decoded video is a pulse signal and therefore may be one bit of amplitude information, but the time quantization in the distance direction needs to be very fine. is there. Due to such fine time quantization, the amount of video data becomes enormous, and it is necessary to use a high-capacity digital line for transmission lines or to bundle a large number of small-capacity digital lines for time division transmission. There is a disadvantage that maintenance costs such as royalties are high.

[0007] The four types of decoded video shown in FIG. 3 have a very small proportion of the entire display content. However, the conventional digital transmission method has a drawback of inefficient transmission because the time is quantized uniformly and finely regardless of the presence or absence of a pulse signal and a portion without a pulse signal is also transmitted.

It is an object of the present invention to provide a decoded video transmission system for a secondary surveillance radar in which the above-mentioned disadvantages are eliminated and the data transmission amount is significantly reduced without reducing the distance resolution and the azimuth resolution.

The radar antenna is located in a long-distance coverage area.
Set the time quantization unit to capture multiple aircraft.
Radar pulse generation for sending pulse signals with a pulse width
Video signals from the secondary surveillance radar
And transmission synchronized with the transmission time of the radar pulse generator
Synchronized with the trigger signal and the rotation of the radar antenna
Remote transmission terminal that transmits and receives angle signals and this remote transmission terminal
And a decoder that decodes these video signals
And a display unit for displaying the obtained decoded video.
Video transmission equipment for secondary surveillance radar
Te, a pulse rise detecting means for detecting the pulse rise of the de-coded video input and outputs a rising detection signal at the same timing as the rise of the de-coded video, detects the pulse fall of the de-coded video input Pulse falling detecting means for outputting a falling detection signal at the same timing as the falling of the decoded video, and outputting a time interval between the rising detection signal and the falling detection signal as a pulse width of the decoded video. a pulse width detection means, a distance which is located in the <br/> transmission trigger its de coded video distance information at the output timing of the rising edge detection signal calculated distance information after the transmission timing by the clock to set the transmission timing a distance information calculation means for outputting as information, oriented the radar a <br/> antenna Wherein the azimuth information calculation means for outputting the azimuth information at the time of output timing of the rising edge detection signal calculated azimuth information by the angle signal and the clock corresponding to the direction azimuth information located in the de-coded video, the pulse width and the distance Transmission data converting means for formatting information and the azimuth information and outputting the data as transmission data, wherein the data amount is compressed and transmitted by digitally processing only the decoded video.

Further, in the decoded video transmission apparatus of the secondary surveillance radar according to the present invention, both the pulse width detecting means and the distance information calculating means use the conventional time quantization unit.
And a clock that ensures the same resolution as the time quantization unit of the decoded video, and the angle signal in the azimuth information calculating means is obtained from the conventional angle signal.

[0011]

Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of one embodiment of the present invention. The data of the secondary surveillance radar shown in this embodiment is
The coded video transmission apparatus is a video 2 shown in FIG.
5 (corresponding to the decoded video 7 in FIG. 1)
The transmission data 15 is output to the display unit 24. FIG. 3
A radar pulse is transmitted from the remote transmission terminal 20 shown in FIG.
Trigger 8 and secondary monitoring radar synchronized with
Synchronizes with the rotation angle of the radar antenna provided in the transceiver
Transmitting the decoded angle signal 9 to the decoded video transmission apparatus.
To supply .

The configuration of the embodiment shown in FIG. 1 has a pulse rising detecting section 1 as pulse rising detecting means, a pulse falling detecting section 2 as pulse falling detecting means, and a pulse width detecting means as pulse width detecting means. It comprises a unit 3, a distance information calculation unit 4 as distance information calculation means, an azimuth information calculation unit 5 as azimuth information calculation means, and a transmission data conversion unit 6 as transmission data conversion means.

FIG. 2 is a waveform diagram of the decoded video, the rise detection signal and the fall detection signal in the embodiment of FIG.

Hereinafter, the data compression operation in this embodiment will be described with reference to FIG.

FIG. 2 output from the secondary surveillance radar device
The decoded video 7 shown in FIG.
Is sent to the pulse falling detector 2.

The pulse rise detector 1 detects the rise of the decoded video and outputs a rise detection signal 10 shown in FIG. 2 at the same timing as the rise of the decoded video.

The pulse falling detector 2 detects a falling edge of the decoded video 7 and
The falling detection signal 11 shown in FIG.

The distance information calculating section 4 outputs a rising detection signal 10
Is obtained by measuring the time from the trigger 8 to the rising detection signal 10, that is, the time between the transmission trigger 8 and the rising detection signal by the clock 16. At this time, a clock having the same resolution as the time quantization unit of the conventional decoded video is used as the time quantization unit. The calculated distance information of the decoded video is output to the transmission data converting unit 6 as the distance information 13.

As the azimuth information of the decoded video, the azimuth information calculator 5 outputs the count value of the angle signal 9 at the time of outputting the rising detection signal 10 as the azimuth information 14 of the decoded video. The azimuth information 14 is sent to the transmission data conversion unit 6.

The pulse width of the decoded video 7 is obtained by measuring the time difference between the rise detection signal 10 and the fall detection signal 11 shown in FIG. Output as pulse width data 12. At this time, a clock having the same resolution as the time quantization unit of the conventional decoded video is used as the time quantization unit.

The pulse width data 12, thus measured,
The distance information 13 and the azimuth information 14 are formatted and output as transmission data 15 for each decoded video in the transmission data conversion unit 6.

In this manner, the decoded video component is detected, and only the decoded video is digitally transmitted, whereby the amount of transmission data can be compressed, and the capacity of the transmission line can be reduced.

Further, the same resolution and accuracy as in the conventional method can be ensured for the distance information and the azimuth information.

[0025]

As described above, according to the present invention, in the digital transmission of the decoded video of the secondary surveillance radar device, the decoded video component is detected and only the decoded video information is transmitted, so that the data amount is remarkably reduced. It is possible to reduce the capacity of the transmission line and to remarkably reduce the maintenance cost of the line usage fee.

Further, the distance information and the pulse width information of the detected video use a time quantization unit having the same resolution as that of the conventional method, and the azimuth information uses the same angle signal system as that of the conventional method. There is an effect that the data redundancy of the conventional method can be deleted and the transmission can be performed efficiently without deteriorating the resolution and accuracy of the distance and the azimuth.

[Brief description of the drawings]

FIG. 1 is a block diagram of one embodiment of the present invention.

FIG. 2 is a waveform diagram of decoded video, a rise detection signal, and a fall detection signal in the embodiment of FIG.

FIG. 3 is an explanatory diagram (FIG. 3A) and a configuration diagram (FIG. 3B) of a decoded video of a conventional secondary surveillance radar device.
It is.

[Explanation of symbols]

 Reference Signs List 1 pulse rising detection unit 2 pulse falling detection unit 3 pulse width detection unit 4 distance information calculation unit 5 direction information calculation unit 6 transmission data conversion unit

Claims (1)

(57) [Claims] 1. A secondary surveillance radar comprising a radar antenna and a radar pulse generator for transmitting a pulse signal having a pulse width set to a time quantization unit capable of capturing a plurality of aircraft existing in a long-distance covered area. A remote transmission terminal for transmitting / receiving a video signal from a transmission / reception unit, a transmission trigger signal synchronized with a transmission time point of the radar pulse generator, and an angle signal synchronized with the rotation of the radar antenna, and decoding a video signal from the remote transmission terminal Video decoder for a secondary surveillance radar having a decoder for performing decoding and a display unit for displaying decoded video obtained from the decoder, detects a rising edge of a pulse of the input decoded video and detects a rising edge of the decoded video. Pulse rising detection means for outputting a rising detection signal at the same timing as Pulse falling detecting means for detecting the falling of the pulse of the coded video and outputting a falling detection signal at the same timing as the falling of the decoded video, and setting the time interval between the rising detection signal and the falling detection signal to Pulse width detection means for outputting the pulse width of the decoded video; and distance information after the transmission timing is obtained by the transmission trigger and clock for setting the transmission timing, and the distance information at the output timing of the pulse rising detection signal is decoded. Distance information calculating means for outputting as distance information where the video is located; and azimuth information obtained by the angle signal and clock corresponding to the directional direction of the radar antenna, and the azimuth information at the output timing of the rise detection signal is decoded video data. Of azimuth information to be output as azimuth information of the position And a transmission data converting means for formatting the pulse width, the distance information and the azimuth information and outputting the data as transmission data, and compressing the data amount by digitally processing only the decoded video. Transmit and before
When the pulse width detecting means and the distance information calculating means
The inter-quantization unit is the time of the decoded video.
A clock that ensures the same resolution as the quantization unit
And the angle signal in the azimuth information calculating means is
A decoded video transmission device for a secondary surveillance radar, wherein the decoded video transmission device is obtained from the angle signal .