Main and auxiliary satellite distributed SAR detection integrated imaging satellite system

Abstract

The invention discloses a main and auxiliary satellite distributed SAR detection integrated imaging satellite system. The invention can be used to realize high-resolution SAR imaging, high-precision interferometric SAR height measurement and three-dimensional tomographic SAR imaging. The main and auxiliary satellite distributed SAR detection integrated imaging satellite system utilizes a one-output multi-input or multi-output multi-input work system, and provides 1+N observation data at the same time to strengthen the correlation of the data, so that the imaging data is acquired more efficientand effective; meanwhile, by locating the main satellites at the center, and making the auxiliary satellites fly along with a configured co-orbital plane of the Carwheel wheel trajectory, short baselines that satisfy the optimal vertical effective baseline requirements and are formed between the main and auxiliary satellites and long baselines that are formed between the auxiliary satellites andcan guide the short baselines to perform relevant interference processing exist at any time throughout the entire orbital period, which improves the system efficiency and the interferometric height measurement precision; and the wheel trajectory of the auxiliary satellites changes in the orbit by the orbit changing technique. Therefore, the main and auxiliary satellite distributed SAR detection integrated imaging satellite system has more compact configuration, and forms a spatial virtual large aperture, which is advantageous for using the sparse aperture algorithm for imaging of higher resolution.

Description

technical field [0001] The invention relates to the technical field of distributed formation satellites, in particular to an integrated imaging satellite system for distributed SAR detection of primary and secondary satellites. Background technique [0002] The distributed SAR system is a multi-antenna radar system that separates the receiving and transmitting antennas of SAR on different satellites, and the satellites fly in a certain configuration and work together. It not only has the all-weather-all-weather It has the characteristics of earth observation and penetrating ability to certain ground objects, and can complete various tasks such as high-resolution imaging of wide surveying swaths, elevation inversion, and three-dimensional imaging through complementary information provided by multiple baselines and multiple perspectives. Since the concept was proposed, the United States, Germany, France, Italy, Canada and other countries have formulated their own distributed S...

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Problems solved by technology

[0003] The distributed SAR system that has been planned successively, including the use of densely distributed small satellite systems to transmit and receive signals at the same time, was eventually stranded due to reasons such as large system size and high cost; Sending a group of small satellites only receives signals, and it has not been implemented due to problems such as coordination and synchronization between systems; Germany's TerraSAR-X / TanDEM-X two satellites fly synchronously in formation one after the other, and obtain the The height information of the earth's surface, but because the interferometric baseline formed by the two satellites cannot always provide a baseline for high-precision terrain mapping, the system efficiency is very low

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