Method and device for designing multi-channel receiver of double-base satellite-borne SAR system

Abstract

The invention belongs to the technical field of multi-channel receivers of synthetic aperture radar systems, and discloses a method and a device for designing a multi-channel receiver of a double-basesatellite-borne SAR system. According to the method and the device for designing a multi-channel receiver of a double-base satellite-borne SAR system, eight receiving channels are included, and a + / -5V power supply and a serial control signal are provided for each radio frequency receiving channel through a power supply conversion unit and a control distribution unit in a unified mode. Each radiofrequency receiving channel can independently complete the functions of low noise amplification, MGC, intermediate frequency amplification, balanced phase shift compensation output and the like of radar echo signals, every two receiving channels are output through cross backup, and imaging indexes of a whole radar system are influenced by amplitude-phase consistency performance indexes of every two receiving channels. The method and the device for designing a multi-channel receiver of a double-base satellite-borne SAR system have the outstanding advantages that: 1, the multi-channel receiveris adopted to better meet the working requirements of a new system of high-resolution and wide-swath satellite-borne SAR; and 2, the amplitudes and the phases of the receiving channels are compensatedthrough an equalization phase shifter and a microstrip power division power combiner, the amplitude consistency among the channels reaches 0.4 dB, and the phase consistency reaches 2 degrees.

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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