Relative navigation method of space target based on GNSS reflection signal for bistatic radar

Abstract

According to a double-station radar space target relative navigation method based on GNSS reflected signals, a GSNN satellite is used as an irradiation source, the GNSS reflected signals in an active spacecraft are detected to serve as a relative measurement implementation way of a space target, the relative positions and relative speeds of spacecrafts are determined by means of a motion equation and a state estimation method, and a motion equation model of the target spacecraft and the active spacecraft is obtained at different distances. A detector installed on the active spacecraft is used for receiving direct signals and the reflected signals so as to measure the relative distance between the spacecrafts, and a double-station radar space target relative navigation motion model based on the GNSS reflected signals is established; an absolute state estimator and a relative state estimator are constructed by the adoption of the Kalman filtering method, so that information about the relative positions and relative speeds of the spacecrafts is obtained. According to the method, no independent rendezvous sensor is needed, and when the relative distance between the active spacecraft and the target spacecraft is varied, complete observation information can be obtained.

Description

technical field [0001] The invention belongs to the communication field and relates to a relative navigation method of a space object. Background technique [0002] The relative measurement of the space target refers to the real-time estimation of the relative state of the target aircraft under certain conditions based on the measurement of the spaceborne relative navigation equipment of the tracking aircraft, including relative position, relative velocity or other information representing relative motion. The relative measurement is the input of the guidance and control of the orbital rendezvous, accompanying and approaching process of the aircraft, and the performance of the relative measurement will directly affect the final guidance and control accuracy. At present, commonly used measurement methods for space targets include: microwave rendezvous and docking radar, laser radar, satellite navigation measurement, and CCD optical imaging measurement. Target, that is, there...

AI Technical Summary

Problems solved by technology

The rendezvous sensor installed on the active spacecraft is difficult to obtain complete observation information when the spacecraft are far apart, so the autonomous navigation algorithm cannot meet the relative navigation requirements, and can only rely on the ground to guide the active spacecraft for rendezvous and docking. Increased the burden of ground measurement and control

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