A four-star helix formation configuration that provides stable long and short baselines

Abstract

The invention discloses a four-satellite Helix formation configuration capable of providing stable long and short baselines. By using the method provided by the invention, stable vertical effective long baselines and vertical effective short baselines can be provided in one track cycle, so that the high precision interference measurement can be realized using baselines combining the long baselinesand the short baselines. The configuration of the invention comprises 1 main satellite and three auxiliary satellites. A main satellite orbit and each auxiliary satellite orbit are respectively double helix tracks that satisfy the Helix configuration. According to the four-satellite Helix formation configuration capable of providing stable long and short baselines, at any moment in the formationflight process, the main satellite can form an optimal vertical effective baseline with one auxiliary satellite, so that a range indicator of optimal baseline values can be satisfied. An effective long baseline formed between two auxiliary satellites is present at any moment, and therefore, a stable set of effective long baselines and short baselines are always present at any moment in the whole track period, so that the high precision interference measurement can be realized using baselines combining the long baselines and the short baselines.

Description

technical field [0001] The invention relates to the technical field of distributed SAR systems, in particular to a four-star Helix formation configuration that can provide stable long and short baselines. 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] The TerraSAR-X / TanDEM-X double-star formation interferometric SAR system of the German Space Center (DLR) is the world's first ...

AI Technical Summary

Problems solved by technology

However, in the case where the orbit of the binary star is not adjusted, there is only one set of effective vertical baselines, and the effective vertical baselines cannot exist all the time within one orbital period, and the efficiency of using it to complete global high-precision surveying and mapping tasks is relatively low

Images