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A loopback self-calibration method based on internal calibration source of secondary radar monopulse angle measurement

A single-pulse angle measurement and internal calibration technology, applied in radio wave measurement systems, instruments, etc., can solve the problems of sum/difference channel characteristic changes, affecting sign bit calculation and target angle measurement accuracy, target angle deviation, etc., to reduce Requirements and maintenance costs, effects of improving target angle measurement accuracy

Active Publication Date: 2021-10-26
四川九洲空管科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The application of monopulse angle measurement technology in the secondary radar can greatly improve the detection accuracy of the target, and the monopulse angle measurement technology needs to accurately obtain the sum / difference of the amplitude and phase of the two beams, and then calculate the accurate sign bit and target angle. Due to the difference of the front-end analog receiving channel, there is a large deviation in the amplitude and phase characteristics of the sum / difference channel signal transmitted to the back-end digital processing equipment compared with the antenna end, resulting in a large deviation in the calculated target angle
[0003] The existing calibration method requires testing in a dark room to calibrate the amplitude and phase characteristics of the sum / difference channel, and then perform fixed compensation in the equipment. It may cause changes in the characteristics of the sum / difference channel, which will eventually lead to a large deviation in the amplitude and phase characteristics of the sum / difference channel signal transmitted to the back-end digital processing equipment compared with the antenna end, affecting the sign bit calculation and target angle measurement. precision

Method used

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  • A loopback self-calibration method based on internal calibration source of secondary radar monopulse angle measurement
  • A loopback self-calibration method based on internal calibration source of secondary radar monopulse angle measurement
  • A loopback self-calibration method based on internal calibration source of secondary radar monopulse angle measurement

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Experimental program
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Effect test

Embodiment 1

[0041] Such as figure 1 As shown, a self-calibration method based on the internal calibration source loopback of the secondary radar monopulse angle measurement includes the following seven steps: calibration control, calibration pulse encoding, calibration source emission, calibration signal reception, calibration signal sampling and reporting, calibration compensation value Calculate the compensation operation of sending and receiving signals.

[0042] Step 1: Calibration Controls

[0043] The signal processing CPU sends the first calibration parameter and the second calibration parameter to the signal processing FPGA (field programmable gate array, the same below), and the first calibration parameter includes: calibration coding signal AM (calibration source power amplifier switch signal, the same below) Leading edge lag calibration trigger time, calibration encoding signal ASK (encoding pulse signal, the same below) leading edge lag calibration trigger time, calibration e...

Embodiment 2

[0070] On the basis of Embodiment 1, preferably, the calibration signal is sent to the sum / difference channel of the receiving module through a radio frequency connection line and a circulator. Ensure that the calibration signal is accurately and stably input to the sum / difference channel of the receiving module.

Embodiment 3

[0072] On the basis of Embodiment 1, preferably, the source frequency of the calibration source and receiver can be extended from 1090Mhz to any other frequency, so as to realize the application of channel calibration requirements under different frequency signal receiving and processing systems.

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Abstract

The present invention relates to the field of signal processing, and discloses a self-calibration method based on secondary radar single-pulse angle measurement internal calibration source loopback. The present invention includes seven steps: calibration control, calibration pulse encoding, calibration source emission, calibration signal reception, Calibration signal sampling and reporting, calibration compensation value calculation and delivery, and receiving signal compensation calculation; this method does not require an additional external calibration environment, and is realized through the internal software and hardware of the secondary radar, reducing the demand on the external environment and maintenance costs; at the same time, it can During the use of the secondary radar, the sum / difference channel amplitude and phase are calibrated in real time to improve the target angle measurement accuracy of the secondary radar.

Description

technical field [0001] The invention relates to the field of digital signal processing, in particular to a loopback self-calibration method based on a secondary radar single pulse angle measurement internal calibration source. Background technique [0002] Secondary radar can accurately detect the azimuth, altitude, and speed information of aircraft, and is widely used in air traffic control fields such as military and civilian air route flight surveillance, daily and military exercise flight support, etc. The application of monopulse angle measurement technology in the secondary radar can greatly improve the detection accuracy of the target, and the monopulse angle measurement technology needs to accurately obtain the sum / difference of the amplitude and phase of the two beams, and then calculate the accurate sign bit and target angle. Due to the differences in the front-end analog receiving channels, the amplitude and phase characteristics of the sum / difference channel sign...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/40
CPCG01S7/4004
Inventor 蒋鑫邹亮刘永刚
Owner 四川九洲空管科技有限责任公司