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Phase synchronization method and device

A technology of phase synchronization and phase difference, applied in the directions of synchronization devices, synchronization devices, measurement devices, etc., can solve the problems of inability to offset low-frequency phase noise components, irrelevance of phase noise, affecting imaging focus and interference phase accuracy, etc., to improve imaging. quality effect

Active Publication Date: 2018-11-16
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 low-frequency phase noise components, the phase error in the echo domain caused by phase asynchrony will affect the imaging focus and interferometric phase accuracy; therefore, phase synchronization is required

Method used

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Embodiment Construction

[0045] In the embodiment of the present invention, the second SAR receives the first phase synchronization signal sent by the first SAR to obtain the first received signal; the first SAR receives the second phase synchronization signal sent by the second SAR to obtain the first received signal Two received signals; determine the peak phase difference between the first received signal and the second received signal, and determine the compensation phase according to the peak phase difference using a first preset rule; according to the compensation phase, the second SAR received Phase compensation is performed on the echo signal generated by the radar signal emitted by the first SAR.

[0046] The phase synchronization method provided by the embodiment of the present invention, such as figure 1 As shown, the method includes:

[0047] Step 101: The second SAR receives the first phase synchronization signal sent by the first SAR to obtain a first received signal; and the first SAR ...

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Abstract

The invention discloses a phase synchronization method comprising that a second synthetic aperture radar (SAR) receives a first phase synchronization signal transmitted by a first SAR to obtain a first received signal; the first SAR receives a second phase synchronization signal sent by the second SAR to obtain a second received signal; a peak phase difference between the first received signal andthe second received signal is determined, and a compensation phase is determined according to the peak phase difference according to a first preset rule; phase compensation is performed on an echo signal generated by a radar signal transmitted by the first SAR and received by the second SAR according to the compensation phase. The invention also discloses a phase synchronization device, a storagemedium and an information processing device.

Description

technical field [0001] The present invention relates to Synthetic Aperture Radar (SAR, Synthetic Aperture Radar) technology, in particular to a phase synchronization method and device. Background technique [0002] SAR is a microwave imaging radar, which can be installed on flying platforms such as airplanes, satellites or spacecrafts for all-weather and all-weather observation of the earth; at the same time, SAR has a certain ability to penetrate the ground; therefore, the SAR system is Disaster monitoring, resource exploration, marine monitoring, environmental monitoring, crop census and yield estimation, surveying and mapping, and military reconnaissance have unique advantages, and can play a role that other remote sensing methods are difficult to play. More and more applications are in civil and national defense field. [0003] The multi-satellite formation SAR system is an important new concept radar system. The system mounts the radar on multiple satellites flying in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L7/00G01S13/90
CPCG01S13/90H04L7/007G01S7/006G01S7/4004G01S13/003G01S13/9058G01S7/41H04B7/18513H04W56/001H04W56/0035H04B17/336
Inventor 金国栋刘开雨王宇邓云凯贾小雪李创
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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