Non-interrupted bistatic sar phase synchronization signal processing method based on coded signal
A phase synchronization and encoding signal technology, applied in the field of radar, can solve the problems that the low-frequency phase noise component cannot be offset, the imaging focus and the interference phase accuracy are affected, and the phase noise is irrelevant.
Active Publication Date: 2020-10-02
INST OF ELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology
However, since the main and auxiliary satellites use different crystal oscillators, on the one hand, there will be a phase error introduced by the frequency error of the crystal oscillator in the azimuth direction, which will accumulate over time; In the case of a station, the low-frequency phase noise component is offset, and the phase error in the echo domain generated by the phase out of synchronization will affect the imaging focus and interferometric phase accuracy
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Embodiment 1
[0021] An embodiment of the present invention provides a bistatic SAR phase synchronization signal processing method based on coded signals, such as figure 1 shown. The method comprises the steps of:
[0022] step one:
[0023] It is assumed that the sampling rate of the first SAR (primary satellite) and the second SAR (secondary satellite) are 60 MHz, and the carrier frequency is 1.2 GHz. The radar signal emitted by the first SAR has a pulse width of T 1 =40us, the bandwidth is B 1 = 50MHz negative frequency-modulated chirp signal, assuming a point target in the scene, its backscatter coefficient is set to 1, the echo signal of the point target is received by the first SAR and the second SAR, and the first echo signal is obtained and the second echo signal. The first SAR sends a second phase synchronization signal, wherein the second phase synchronization signal has a pulse width T 2 =10us, the bandwidth is B 2 =50MHz positive frequency-modulated chirp signal, the seco...
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The embodiment of the present invention discloses a non-interrupted bistatic SAR phase synchronization signal processing method based on coded signals, wherein, when the first received signal of the first SAR contains only the first synchronous received signal, it is directly treated as the first echo processing signal; when the first received signal contains the first synchronous received signal, extract the peak phase of the synchronous signal, and then separate the synchronous signal to obtain the first echo processing signal; the second received signal of the second SAR does not contain the second synchronous received signal When the second echo signal is used, it is directly used as the second echo processing signal; when the second received signal contains a received signal for the second echo, the peak phase of the synchronization signal is extracted, and then the synchronization signal is separated to obtain the second echo processing signal. The compensation phase is calculated through the peak phase, interpolated and compensated into the second echo processing signal, and then normal imaging processing is performed on the obtained first echo processing signal and the second echo processing signal.
Description
technical field [0001] The invention belongs to the technical field of radar, in particular to a non-interrupted bistatic synthetic aperture radar (Synthetic Aperture Radar, SAR) phase synchronization signal processing method based on coded signals. Background technique [0002] Synthetic Aperture Radar (SAR) is an active microwave imaging radar with the characteristics of all-day and all-weather work. unique advantage. [0003] Compared with monostatic radar, bistatic radar has the advantages of flexible configuration, rich information acquisition, and anti-jamming due to the special configuration of separate transceivers. These advantages and application prospects have made bistatic radar more and more popular in recent years. The bistatic SAR system is a new and important radar system. The system carries the radar on two satellites flying in formation to form a bistatic radar system, which jointly completes large-scale high-resolution imaging, ground elevation measuremen...
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IPC IPC(8): G01S13/90G01S7/41
CPCG01S7/41G01S7/4021G01S13/9058
Inventor 梁达张衡邓云凯王宇刘开雨陈亚锋刘大成
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI