A design method and device of a multi-channel receiver for a dual-base satellite-borne SAR system

Abstract

The invention belongs to the technical field of multi-channel receivers for synthetic aperture radar systems, and discloses a design method and device for a multi-channel receiver for a dual-base spaceborne SAR system. The design method and device for the multi-channel receiver of the dual-base satellite-borne SAR system include eight receiving channels, and each radio frequency receiving channel is uniformly provided with a ±5V power supply and a serial control signal by a power conversion unit and a control distribution unit. Each RF receiving channel can independently complete functions such as low-noise amplification of radar echo signals, MGC, intermediate frequency amplification, and balanced phase-shift compensation output. Every two receiving channels are output through cross-backup, and their amplitude-phase consistency performance indicators affect the entire system. Imaging metrics for radar systems. The outstanding advantages of the present invention are as follows: one is that the multi-channel receiver is more in line with the work requirements of the new system with high resolution and wide surveying and mapping space-borne SAR; Amplitude and phase, the amplitude consistency between channels reaches 0.4dB, and the phase consistency reaches 2°.

Description

technical field [0001] The invention belongs to the technical field of synthetic aperture radar (SAR) channels, and in particular relates to a design method and device for a multi-channel receiver of a dual-base spaceborne SAR system. Background technique [0002] (1) With the development of space technology, the competition for space exploration in various countries is becoming increasingly fierce. Spaceborne synthetic aperture radar (SAR) can not be affected by weather environment, climate, etc., and can conduct earth observation with high resolution all-weather. It has become the main satellite at present. One of the important research directions of load. In the spaceborne SAR system, the radar receiver completes the functions of low-noise amplification of the radar echo signal, MGC, radio frequency amplification and cross-backup output, and its performance index affects the imaging index of the entire radar system. [0003] (2) The new high-resolution, wide-swath spaceb...

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Problems solved by technology

[0004] Aiming at the problems of complex receiver circuit, high technical difficulty, poor reliability, and low accuracy of amplitude and phase consistency between receiving channels in the prior art, the present invention proposes a design method and device for a multi-channel receiver of a dual-base spaceborne SAR system , adjust the amplitude and phase characteristics of each receiving channel separately, so as to achieve high-precision amplitude-phase consistency between receiving channels

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