Real-time ground clutter suppression method for space-based external radiation source radar
A technology for external radiation source radar and clutter interference, applied to radio wave measurement systems, instruments, etc., can solve problems such as long convergence time, reduce algorithm complexity, and high complexity, and achieve good engineering realization and low algorithm complexity , The system structure is simple and reliable
Active Publication Date: 2018-06-19
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 It is a schematic diagram of the working principle of the space-based external radiation source. The system adopts a bistatic or multistatic radar architecture. The space-based external radiation source usually adopts a constellation of geostationary orbit (GEO) satellites, and the radar receiver is installed on a low-orbit satellite platform to simultaneously receive Direct wave signals and echo signals, where echo signals may come from ground stationary targets, ground moving targets and air moving targets. In a typical target detection application, the moving target in the air and the moving target on the ground are of interest to the user, while the echo of the stationary target on the ground becomes a clutter signal that affects the detection of the moving target, which needs to be processed by a certain clutter suppression algorithm. target detection.
[0024] refer to Figure 4 and Figure 5 , the invention aims at broadening the clutter spectrum caus...
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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 ground clutter interference suppression method for 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 multistatic radar system. It does not use a transmitter itself, but uses navigation and communication satellite signals as an external radiation source, and installs radar receivers on aircraft, drones, and airships. , balloons, satellites and other generalized space-based platforms, detect the disturbance of the electromagnetic field of the external radiation source of the aerial target to achieve target detection, such as figure 1 shown. [0003] In the signal processing flow of space-based external radiation source radar, ground clutter suppression is the main difficulty faced by the system. The clutter spectrum of traditional ground-based radar is mainly distribu...
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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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