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Multi-channel correcting method for ultra wide-band synthetic aperture radar

A technology of synthetic aperture radar and correction method, which is applied to radio wave measurement systems, instruments, etc., can solve problems such as unfavorable processing, ideal echo signals do not have approximate rectangles, and cannot obtain pulse compression performance, etc., and achieves correction of frequency characteristic mismatch. , Improve the effect of pulse compression performance

Active Publication Date: 2011-10-19
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

However, when the time-width-bandwidth product of the chirp signal is less than 100 (this is called the hour-wide bandwidth product chirp signal), the amplitude spectrum of the ideal echo signal does not have approximately rectangular characteristics, and there is a serious Fresnel in the passband Therefore, selecting the ideal receiving channel as the reference channel for channel correction cannot obtain good pulse compression performance, which is not conducive to the processing of UWB SAR / GMTI back-end systems

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Embodiment Construction

[0035] figure 1 It is a flowchart of the channel correction method of the present invention. The specific implementation scheme is divided into four steps:

[0036] The first step is to construct a matched filter system function M(f) using spectrum correction technology;

[0037] The second step is to correct the ideal receiving channel to obtain the reference channel H ref (f);

[0038] The third step is to construct a channel equalizer E for each receiving channel m (f), m=1, 2, L, L;

[0039] The fourth step is to complete the correction of channel inconsistency.

[0040] Figure 2 to Figure 4 It is the result of experiments conducted in the laboratory using measured data. The actual radar system used has 3 channels.

[0041] figure 2 It is the relative amplitude and phase error of the measured data of the first three channels before channel correction. Mismatched channel relative amplitude and phase error factor D mn (f) is defined as the ratio of two mismatched channel system ...

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Abstract

The invention provides a multi-channel correcting method for ultra wide-band synthetic aperture radar. The method is applied to a multi-channel ultra wide-band synthetic aperture radar / ground moving target indication (UWB SAR / GMTI) system under an hour wide-band width product linear frequency modulation signal system. The technical scheme disclosed by the invention comprises the following steps of: 1, constructing a matched filter system function by using a spectrum correcting technology; 2, correcting an ideal receiving channel to acquire a reference channel; 3, constructing a channel equalizer for each receiving channel; and 4, completing inconsistency correction of the channels. According to the multi-channel correcting method disclosed by the invention, by combining the spectrum correcting technology and inserting the channel equalizer into each receiving channel, frequency property mismatch is corrected, inconsistency correction of the channels is completed, and the pulse compression performance of hour wide-band width product linear frequency modulation signals is effectively improved.

Description

Technical field [0001] The invention belongs to the technical field of radar signal processing, and relates to a channel correction method for multi-channel UWB SAR (Ultra Wide-band Synthetic Aperture Radar), in particular to a multi-channel UWB SAR channel under an hourly wide bandwidth product chirp signal system Correction method. Background technique [0002] Research and war practices in the past ten years have shown that the combination of UWB SAR and GMTI (Ground Moving Target Indication) can better meet the needs of modern battlefield reconnaissance. It can better capture the actual scene, improve the intelligence gathering ability and intelligence accuracy. Among them, clutter suppression is the primary problem of moving target detection, and channel correction is an important factor affecting clutter suppression performance. Therefore, channel correction is an important issue for multi-channel UWB SAR / GMTI radar systems. [0003] In the multi-channel UWB SAR / GMTI radar...

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Application Information

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IPC IPC(8): G01S7/40
Inventor 黄晓涛朱国富雷鹏正黎向阳李悦丽周智敏范崇祎周红
Owner NAT UNIV OF DEFENSE TECH
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