Spacing synchronization process for satellite-machine double-base SAR system

Abstract

A space synchronous method of a space-borne bi-static SAR system belongs to the processing technical field of electronic signals, and relates to the spatial remote sensing and air-to-ground observable information processing technology, in particular to the spatial synchronous technology of the space-borne bi-static SAR. On one hand, the invention broadens and receives broad beams in the azimuth direction through reducing the antenna dimension of an aircraft in the azimuth direction or only driving the partial array number of the phase array antenna of a receiving platform, thereby improving the scene length of the space-borne bi-static SAR system, on the other hand, the invention broadens and transmits the beams through reducing the antenna dimension of the aircraft in the azimuth direction or only driving the partial array number of the phase array antenna of the receiving platform, thereby improving the azimuth resolution of the space-borne bi-static SAR system. After the receiving and the transmitting beams are broadened, the scene length can achieve the magnitude of at least 1 kilometer; and the magnitude of the azimuth resolution can achieve meter level. The invention only needs to reasonably control the effective array number in the phase array antenna without changing any hardware of the prior radar system. The invention has the advantages of simple control proposal, low cost and high reliability.

Description

technical field [0001] The invention belongs to the technical field of electronic signal processing, and relates to space remote sensing and space-to-earth observation information processing technology, in particular to a star-machine bistatic SAR (Synthetic Aperture Radar, Synthetic Aperture Radar) space synchronization technology. Background technique [0002] Bistatic SAR is a synthetic aperture radar with a new system of receiving and transmitting separately. Since the receiver is always in the state of radio silence during the working process, the concealment and anti-interference ability of the SAR system are improved. By using different observation angles, various scattering information of the target can be obtained, which is beneficial to the classification and identification of the target and the improvement of the anti-stealth target capability. By providing the Doppler bandwidth from the launch platform, "forward-looking" or even "backward-looking" imaging of the...

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Problems solved by technology

[0006] However, the above scheme has some disadvantages, mainly including: (1) In order to keep the azimuth resolution from being too low, the multiplier of receiving beam velocity is limited, resulting in a short scene length

(2) During the echo signal acquisition process, the beam pointing of the transceiver platform must be continuously changed, which intensifies the space-varying characteristics of the system, and the corresponding imaging algorithm design is relatively difficult

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