A large-scale antenna sparse array implementation and signal processing method for spaceborne radar

Abstract

The invention discloses a large-scale antenna sparse array realization and a signal processing method of a spaceborne radar. The method adopts a large sparse array antenna; the sparse array sub-array is a two-dimensional electric scanning active phased sub-array, the sub-array adopts a rigid structure, the whole array works in a non-rigid state, and each sub-array adopts a distributed multi-node , The high-precision position and attitude measurement system measures the spatial position of its phase center, introduces the motion compensation method in the imaging processing of synthetic aperture radar, removes the influence of large array deformation on the full array pattern, and through the comprehensive processing of the sub-array signal aperture, forms The ideal full-array pattern can obtain high spatial resolution; the sparse array sub-array and the solar wing are integrated and installed, and the antenna deployment mechanism adopts a folding and unfolding method similar to the current satellite solar wing. The observation range of the large sparse array antenna is determined by the beam width of the sub-array antenna, and the spatial resolution is realized by the full array antenna. It can be used for long-distance moving target detection and high-resolution earth observation imaging of medium and high orbit spaceborne radars.

Description

A spaceborne radar large-scale antenna sparse array implementation and signal processing method Technical field The present invention relates to radar system and radar antenna technical field, particularly a kind of spaceborne radar large-scale antenna is sparse Array implementation and signal processing methods. Background technique Space-borne radar takes satellite as observation platform, can be used for space / air / ground / sea moving target detection, It can also realize high-resolution imaging observation of the earth. As the core equipment for obtaining information, spaceborne radar has become the The research focus of each space power. Work on the spaceborne radar of higher orbit, in order to meet the needs of moving target detection and ground high-resolution imaging, There is a need for active phased array antennas with large aperture, light weight, expandable and small foldable volume. With the active phased array antenna technology With the development of...

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Problems solved by technology

The large-scale antenna project of spaceborne radar of above-mentioned traditional form realizes that difficulty is bigger

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