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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 of affecting imaging focus and interferometric phase accuracy, irrelevant phase noise, and inability to offset low-frequency phase noise components

Active Publication Date: 2019-11-22
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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  • Non-interrupted bistatic SAR phase synchronization signal processing method based on coded signal
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  • Non-interrupted bistatic SAR phase synchronization signal processing method based on coded signal

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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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Abstract

The embodiment of the invention discloses a non-interrupted bistatic SAR phase synchronization signal processing method based on a coded signal. The method comprises the steps of: when a first receiving signal of a first SAR only contains a first synchronization receiving signal, directly taking the first receiving signal as a first echo processing signal; when the first synchronization receivingsignal is contained in the first receiving signal, extracting the peak phase of the synchronous signal, and separating the synchronous signal to obtain a first echo processing signal; when a second synchronous receiving signal is not contained in the second receiving signal of a second SAR, directly taking the second receiving signal as a second echo processing signal; and when a second echo receiving signal is contained in the second receiving signal, extracting the peak phase of the synchronous signal, and separating the synchronous signal to obtain a second echo processing signal. The consumption phase is calculated according to the peak phase, and is compensated in the second echo processing signal after interpolation, and the obtained first and second echo processing signals are subjected to normal imaging processing.

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...

Claims

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Application Information

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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
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