Distributed SAR (Synthetic Aperture Radar) configuration with primary component in center and secondary components in cartwheel formation

Abstract

The invention discloses a distributed SAR (Synthetic Aperture Radar) configuration with a primary component in the center and secondary components in cartwheel formation. With the distributed SAR configuration, stable vertical effective baselines can be formed, a long vertical effective baseline and a short vertical effective baseline exist at any moment in one orbital period, the interferometricprecision can be effectively improved and the energy consumption is low. The distributed SAR configuration comprises one primary component and multiple secondary components, wherein the primary component and the secondary components are located on the same orbital plane; the secondary components are uniformly distributed on a cartwheel elliptical orbit with the primary component as the center andfly around the primary component along the cartwheel elliptical orbit; under the configuration, the long vertical effective baseline formed by two secondary components and the optimal short vertical effective baseline formed by the primary component and one secondary component exist at any moment of the running period of the whole orbit, thus the optimal interference signal treatment can be performed by using the long and short baselines, a high-precision DEM (Dynamic Effect Model) of a surveying area is efficiently obtained in high quality, the relative height accuracy can reach 0.5 m and canmeet the surveying and drawing requirement of the proportional scale of 1:5000.

Description

technical field [0001] The invention relates to the technical field of distributed formation satellites, in particular to a distributed SAR system configuration in which a main satellite is located at the center and auxiliary satellites are in cartwheel formation to meet the requirements of high-precision surveying and mapping. Background technique [0002] The traditional SAR satellite is limited by the platform, it is difficult to form a long enough space baseline, and the interference complex image can only be obtained by repeating the track, and the correlation of the image is greatly reduced with the passage of time; each satellite in the distributed satellite system No physical connection is required, and a sufficiently large and flexible baseline can be provided by rationally designing the formation configuration, so that multiple coherent complex images of the same area can be obtained at the same time, ensuring the correlation of interference processing. [0003] In...

AI Technical Summary

Problems solved by technology

However, according to Kepler's law, in the free flight state, the satellite formation cannot run in parallel orbits, and the satellite power system must be used to keep the parallel orbits of the satellites, which puts higher demands on the energy consumption and flight control of the satellites. requirements

[0005] At the same time, the stability of the configuration also seriously affects the work of satellite system measurement, control and other subsystems, which in turn affects the cost and mission life of the satellite system

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