Micro-nano satellite cluster relative positioning method based on position fingerprint

Abstract

The invention discloses a micro-nano satellite cluster relative positioning method based on a position fingerprint. The method comprises the following steps: S1, setting N dynamic proper stars in a micro-nano cluster as AP of cluster relative positioning, and according to cluster need, establishing a dynamic coordinate system; S2, based on real sampling data and a free-space propagation model, establishing a dynamic fingerprint database; S3, periodically broadcasting by the proper stars; S4, receiving a field strength signal by member stars, and downloading the fingerprint database, thus completing position fingerprint identification; and S5, informing the proper stars of a measuring result of relative positioning by each member star through inter-star directional communication, filteringby the proper stars according to relative motion, thereby acquiring continuous cluster relative positioning information. According to the method provided by the invention, in a process of micro-nano satellite close range cluster formation, a simple omnidirectional antenna is erected, through an existing inter-star communication link device, a relative position relation between the clusters can easily acquired, realizing rapid relative positioning between members in the tight cluster, and space environment is pure, and the device is simple and reliable.

Description

technical field [0001] The invention belongs to the technical field of spacecraft navigation, and in particular relates to a relative measurement technology between clusters of satellites, in particular to a method for relative positioning of micro-nano satellite clusters based on position fingerprints. Background technique [0002] With the continuous development of satellite technology in various countries, higher requirements are put forward for satellites in terms of high timeliness, high resolution, high cost efficiency, and high reliability. With the characteristics of fast response, flexible deployment, autonomous networking, and low cost, micro-nano satellite clusters have become one of the main research directions in the satellite field. The structure of the micro-nano cluster is separated, and only through wireless interconnection to form a formation flight for coordinated observation, which can achieve higher efficiency and obtain massive data in a short time for ...

AI Technical Summary

Problems solved by technology

Using traditional remote relative positioning methods, each satellite in the micro-nano cluster needs to be equipped with satellite navigation receivers, and has high requirements for clock synchronization. High; using the traditional short-range relative positioning method, each satellite in the micro-nano cluster needs to be equipped with a separate measurement unit, which requires a higher configuration of the member satellites. At the same time, each satellite needs to measure each member star one by one to complete The time-consuming of cluster measurement is too long, it is not suitable for dynamic clusters, and there is still the problem that the amount of communication data between stars is too high

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