Time and phase synchronization method, system, device and medium
A phase synchronization and time technology, applied in radio wave measurement system, radio wave reflection/reradiation, utilization of reradiation, etc., can solve problems such as image quality degradation, phase error, target position offset, etc., to improve imaging quality and the effect of interferometric precision
Active Publication Date: 2020-10-09
AEROSPACE INFORMATION RES INST CAS
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Problems solved by technology
The introduced time and phase errors will cause defocusing of the target image, degrade the image quality, and the target position shifts and contains phase errors, affecting the interferometric accuracy
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[0034] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. It should be understood, however, that these descriptions are exemplary only, and are not intended to limit the scope of the present invention. In the following detailed description, for convenience of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the present invention. It will be apparent, however, that one or more embodiments may be practiced without these specific details. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concepts of the present invention.
[0035] The terminology used herein is for the purpose of describing specific embodiments only, and is not intended to limit the present invention. The terms "comprising", "comprising" and the like as used herein indicate the presence of stat...
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The invention provides a time and phase synchronization method, system and device and a medium. The method comprises the following steps: S1, acquiring a main satellite echo signal and an auxiliary satellite echo signal; S2, acquiring a phase error and a time error of an auxiliary satellite relative to a main satellite, compensating the auxiliary satellite echo signal, and performing imaging processing on the compensated auxiliary satellite echo signal to obtain an auxiliary satellite image; S3, performing self-focusing processing on the auxiliary star image, and acquiring an estimated phase error and time error to obtain a refocused auxiliary star image; S4, acquiring an updated phase error and an updated time error; and S5, judging whether the estimated phase error and the estimated timeerror meet preset conditions or not, and if yes, taking the updated phase error and the updated time error as a final phase error and a final time error; and if not, repeatedly executing S2 to S5. Therefore, the auxiliary satellite echo data can be accurately compensated, and the imaging quality and the interference precision are improved.
Description
technical field [0001] The present invention relates to a time and phase synchronization method, system, device and medium. Background technique [0002] Synthetic Aperture Radar (SAR) is an active microwave imaging radar that can observe all day and all day, and has a certain surface penetration ability. Therefore, SAR is used in disaster monitoring, resource exploration, environmental monitoring, It has unique advantages in applications such as mapping and military reconnaissance. [0003] The dual-base SAR transceiver has the advantages of flexible baseline configuration, rich information acquisition, anti-interception, and anti-interference. The spaceborne bistatic SAR system is a new and important radar system. The system mounts the radar on multiple satellites flying in formation to jointly complete the high-resolution imaging of the large swath, ground elevation measurement, ocean current velocity measurement and ground moving target. monitoring tasks. In a double-...
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Login to View More IPC IPC(8): G01S13/90G01S13/00
CPCG01S13/9058G01S13/9023G01S13/003
Inventor 梁达张衡刘开雨刘大成王宇
Owner AEROSPACE INFORMATION RES INST CAS