A long-term coherent accumulation method for moving targets in space-based bistatic radar
A bistatic radar and coherent accumulation technology, applied in radio wave measurement systems, instruments, etc., can solve the problems of large amount of computation and complex estimation methods of moving target parameters, and achieve the goal of increasing signal-to-noise ratio and increasing coherent accumulation time Effect
Active Publication Date: 2017-07-11
BEIJING INSTITUTE OF TECHNOLOGYGY
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However, the estimation method of moving target parameters is more complicated, and the computation load is larger.
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[0055] The present invention will be described in detail below with reference to the accompanying drawings and examples.
[0056] The invention provides a long-term coherent accumulation method for a moving target of a space-based bistatic radar.
[0057] Such as figure 1 As shown in , a typical pair of "launch-target-receive" bistatic geometric configuration. Tr, Re, Tar represent the relative geometric positions of the transmitter, receiver and target respectively, V Tr , V Re , V Ta Respectively represent the motion speed of the transmitter, receiver and target.
[0058] The transmitter sends pulsed electromagnetic waves to the target, and the target reflects the pulsed electromagnetic wave signal to the receiver. The receiver receives the target echo signal reflected by the target, and the information processing platform performs signal processing according to the received target echo signal, and judges the radar detection area. Whether there is a target, the signal ...
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The invention discloses a space-based bistatic radar moving target long-time phase-coherent accumulation method. Phase compensation can be achieved during a signal processing process through the method, and doppler phase influences are reduced effectively. The method selects an echo signal of a central point of a scene region as a pulse compression reference signal, namely, the pulse compression reference signal comprises distance time delay and doppler phase information at the same time. A traditional pulse compression method and a Keystone processing method are improved through the provided method. Then FFT processing of the signal along the azimuth is carried out, a plurality of pulse echoes the echo signal along the azimuth are subjected to phase-coherent accumulation, and therefore second-order doppler phase influences caused by complex movement tracks of a radar platform especially a low-orbit receiver platform are reduced. Phase-coherent accumulation time can be prolonged effectively, and therefore the signal to noise ratio of the target echo signal is raised, which facilitates detection, tracking or identification of the target subsequently.
Description
technical field [0001] The invention relates to the field of space-based bistatic radar, in particular to a long-term coherent accumulation method for moving targets of space-based bistatic radar. Background technique [0002] Space-based radar is a research hotspot in the international radar field in recent years. Its advantages include large detection space, strong anti-destroy capability, and not limited by airspace and the curvature of the earth. With the dual-base system, a platform that is very far away from the target area can be used as the system transmitter, such as a radar satellite on the GEO orbit, which can effectively ensure the safety of the system launch; and the receiver only needs to receive silently because it does not need to transmit electromagnetic wave signals , it can work in the area close to the target area, which can effectively reduce the path attenuation and improve the detection performance of the system. [0003] In order to realize the posit...
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IPC IPC(8): G01S7/41
CPCG01S7/415
Inventor 刘飞峰曾涛冯文玲龙腾朱宇任晶晶
Owner BEIJING INSTITUTE OF TECHNOLOGYGY