Ground clutter interference real-time suppression method for space-based external radiation source radar
A technology of external radiation source radar and clutter interference, applied in radio wave measurement systems, instruments, etc., can solve the problems of long convergence time, reduce algorithm complexity, and high complexity, and achieve a simple and reliable system structure and low algorithm complexity. , the effect of good project realization
Active Publication Date: 2015-12-23
SHANGHAI RADIO EQUIP RES INST
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[0006] The purpose of the present invention is to propose a space-based external radiation source radar for detecting sea and air moving targets, the traditional space-time adaptive filtering algorithm has high complexity, long convergence time, and cannot meet the real-time processing requirements. The ground clutter interference suppression method of the source radar can better suppress the ground clutter interference, reduce the complexity of the algorithm, and facilitate the real-time data processing of the space-based platform
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[0023] figure 1 This is a schematic diagram of the working principle of the space-based external radiation source. The system adopts a bistatic or multi-static radar architecture. The space-based external radiation source usually adopts a geostationary orbit (GEO) satellite constellation, and the radar receiver is installed on a low-orbit satellite platform. Direct wave signal and echo signal, wherein the echo signal may come from ground stationary target, ground moving target and air moving target. In typical target detection applications, air moving targets and ground moving targets are of interest to users, while the echoes of ground stationary targets become clutter signals that affect the detection of moving targets, which need to be processed by a certain clutter suppression algorithm to achieve dynamic target detection.
[0024] refer to Figure 4 and Figure 5 The invention aims at the broadening of the clutter spectrum caused by the movement of the radar platform, ...
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The invention relates to a ground clutter interference real-time suppression method for a space-based external radiation source radar. The ground clutter interference real-time suppression method comprises the steps of: completing key parameter design of a space-based external radiation source radar system according to transmitting and receiving time sequence requirements for system RF signals; analyzing spatial position and moving relation between a space-based radar platform and an external radiation source, and establishing a space-based external radiation source radar ground clutter mathematical model; constructing a reference signal by utilizing a direct wave signal, carrying out cross-correlation processing on the reference signal and a target signal received by a two-channel echo antenna; eliminating ground clutter interference of correlation result of an nth frame signal of a channel 1 and correlation result of an (n-1)th frame signal of a channel 2 by adopting a two-pulse canceller; and repeating the cross-correlation processing and the two-pulse cancelling steps for carrying out Fourier transform on N frame signals after clutter suppression along a speed dimension to achieve phase-coherent accumulation, and adopting a constant false-alarm criterion to realize target detection. The ground clutter interference real-time suppression method can be used for suppressing clutter interference effectively, reduces complexity of the algorithm, and is convenient to achieve real-time data processing of the space-based platform.
Description
technical field [0001] The invention relates to a real-time suppression method for ground clutter interference of a space-based external radiation source radar, and belongs to the technical field of radar signal processing. Background technique [0002] Space-based external radiation source radar is a bistatic or multi-static radar system, which does not use transmitters, but uses navigation and communication satellite signals as external radiation sources, and installs radar receivers on aircraft, drones, and airships. On generalized space-based platforms such as balloons, satellites, etc., the disturbance of the electromagnetic field of the external radiation source of the air target is detected to achieve target detection, such as figure 1 shown. [0003] Ground clutter suppression is the main difficulty faced by the system in the process of radar signal processing for space-based external radiation sources. The clutter spectrum of traditional ground-based radars is mai...
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IPC IPC(8): G01S7/36
CPCG01S7/36
Inventor 李雁斌吉峰周郁蔡昆胡鑫黄勇
Owner SHANGHAI RADIO EQUIP RES INST
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