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A multi-channel sar-gmti range ambiguity clutter suppression method

A range ambiguity and clutter suppression technology, which is applied in the radar field, can solve the problems that the system cannot solve the range ambiguity, cannot provide enough channels, and has many blind speeds, so as to avoid Doppler ambiguity, increase the maximum unambiguous speed, and reduce the The effect of pressure

Active Publication Date: 2019-06-18
XIAN INSTITUE OF SPACE RADIO TECH
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Problems solved by technology

The disadvantages of this type of system include: 1. A large number of channels are required to resolve Doppler ambiguity and suppress clutter, and the actual system may not be able to provide enough channels due to reasons such as platform size, load weight, and power; 2. Too much blind speed due to low PRF
If the system works under high PRF, only range ambiguity exists. Although this method avoids Doppler ambiguity, the traditional azimuth multi-channel system cannot remove the range ambiguity.

Method used

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  • A multi-channel sar-gmti range ambiguity clutter suppression method
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  • A multi-channel sar-gmti range ambiguity clutter suppression method

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Embodiment Construction

[0034] The application scenario of the present invention is: the synthetic aperture radar antenna is evenly divided into multiple channels along the azimuth direction, and the number of transmitting channels is N, and the number of receiving channels is M, forming a one-dimensional uniform linear array.

[0035] The geometry of the radar system is figure 1 As shown, the working method is as follows: N antennas transmit orthogonal waveform signals at the same time, M antennas receive at the same time, and K pulses are collected within one synthetic aperture time. Among them, M, N, and K are all positive integers, and N is an integer multiple of the distance ambiguity number Nr. M and K can be selected according to the traditional multi-channel SAR design experience, and there is no special requirement.

[0036] First, a set of matched filters is used to separate the echoes from different transmission channels, and then distance-dependent compensation is performed to separate th...

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Abstract

The invention discloses a multichannel SAR-GMTI range ambiguity clutter suppression method, so as to solve the problem of clutter suppression performance falling when range ambiguity happens to echo. The method comprises steps: 1, echo down conversion and matched filtering are carried out; 2, range dependence compensation is carried out; 3, each range ambiguity echo signal is extracted, and an unambiguous signal is rebuilt; and 4, a space-time adaptive processing method is used for the unambiguous signal to complete clutter suppression in an image domain or a post Doppler domain. The method of the invention can provide the degree of freedom double that of the traditional one-transmitting-N-receiving multichannel system, the range ambiguity clutter can be effectively suppressed, the detection region area is expanded, excessive blind speeds generated by low PRF can be avoided, and the application prospect is good.

Description

technical field [0001] The invention belongs to the technical field of radar, and relates to an adaptive processing method of radar signals, which can be used for clutter suppression in the case of range ambiguity in the echo of a SAR-GMTI system. Background technique [0002] Multi-channel Synthetic Aperture Radar (SAR) can break through the minimum antenna area constraints of single-channel SAR, while achieving high resolution and wide swath imaging. In addition, when using SAR echoes for ground moving target detection, the spatial freedom provided by multiple azimuth channels can also improve the performance of clutter suppression. [0003] For azimuth multi-channel SAR-GMTI (Ground Moving Target Detection) systems, the pulse repetition frequency (PRF) is low, generally there is only Doppler ambiguity but not range ambiguity, and digital beamforming is usually performed on some channels to remove Doppler ambiguity. Le blurring, and then perform clutter suppression on som...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90G01S7/41G01S7/28
CPCG01S7/2813G01S7/414G01S13/904G01S13/9029
Inventor 林晨晨杨晓超王伟伟张欣李渝熊文昌黎薇萍范一飞
Owner XIAN INSTITUE OF SPACE RADIO TECH
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