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Tracking method of synthetic aperture radar signals

A synthetic aperture radar and signal tracking technology, applied in the field of radar signal reconnaissance, can solve the problems of poor applicability of space SAR signal pulse tracking, and achieve the effects of ensuring long-term tracking signals, improving accuracy, and high tracking accuracy

Inactive Publication Date: 2012-08-22
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0004] The present invention provides a synthetic aperture radar signal tracking method to solve the problem of poor applicability of space SAR signal pulse tracking in the prior art

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  • Tracking method of synthetic aperture radar signals
  • Tracking method of synthetic aperture radar signals
  • Tracking method of synthetic aperture radar signals

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Embodiment Construction

[0026] The SAR signal tracking method of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0027] The implementation block diagram of the system is as figure 1 shown.

[0028] Firstly, the I and Q narrow-band signals output by the SAR receiver should be modeled using the coordinate rotation digital calculation (CORDIC) algorithm to obtain the envelope of the signal; then low-pass filtering is performed on the signal envelope to filter out high-frequency noise; then Threshold-crossing indication signal is obtained by detecting the envelope of the filtered signal through the threshold, and the threshold can adopt adaptive threshold and fixed threshold; finally, shaping processing is performed on the threshold-crossing indication signal to filter out burrs.

[0029] Such as figure 2 As shown, the PW, CW and PRT of the threshold indication signal are processed as follows:

[0030] 1. Median filtering is performed on the di...

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Abstract

The invention relates to a tracking method of synthetic aperture radar signals, belonging to the reconnaissance field of radar signals. The tracking method is as follows: generating a tracking gate by measuring pulse width (PW), pulse gap (CW) and repetition period (PRT) of narrowband pulse signals outputted by a synthetic aperture radar (SAR) receiver in real time, and generating a memory tracking gate according to the measured signal parameters before when the signals are weaker so as to be incapable of passing through a detecting threshold, thus realizing tracking to side-lobe signals of an SAR radar antenna. In the tracking method, the decimal part of the average value of the measured PRT is utilized to carry out correction on the memory tracking gate, and therefore, the time of memory tracking is greatly increased.

Description

technical field [0001] The invention relates to a synthetic aperture radar signal tracking method, which belongs to the field of radar signal detection. Background technique [0002] When conducting reconnaissance on spaceborne SAR signals, if only the main lobe signal of the antenna is reconnaissance, because the satellite is running very fast in orbit, the time for receiving and tracking the main lobe signal during reconnaissance is very short, and it is difficult to provide SAR in a timely and effective manner. Satellite overhead warning and guiding the ground interference antenna to align with the satellite, so it is necessary to detect and track both the main lobe signal and the side lobe signal. [0003] Most traditional pulse sequence trackers use hardware digital delay line correlation technology, which is only suitable for tracking conventional radar signals with fixed parameters. The gate width is generally fixed, and the measurement of the pulse repetition period ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/66G01S13/90
Inventor 高梅国刘国满吴志昂
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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