Relative navigation method for autonomous rendezvous of space non-operative target

Abstract

The invention relates to a relative navigation method for autonomous rendezvous of a space non-operative target. The relative navigation method comprises: taking a spacecraft relative orbital motion equation as a navigation state equation, taking relative visual angle information measured by a spaceborne CCD (Charge Coupled Device) camera, absolute positioning information output by a GNSS (Global Navigation Satellite System) receiver and relative distance rho information constructed by geometrical constraint as measure quantities, and employing UKF (Unscented kalman filter) filtering algorithm to accurately estimate the relative position and relative speed between a service satellite and the space non-operative target. The relative navigation method is applicable to relative navigation for remote autonomous rendezvous of space non-operative targets. The relative navigation method has the beneficial effects that: under the conditions that the service satellite has no special orbital maneuver and the number of the service satellite is not increased, the high-accuracy relative navigation for medium / long distance autonomous rendezvous of the space non-operative targets with the service satellite can be realized by only depending on the spaceborne CCD camera and the absolute positioning equipment GNSS receiver of the singular service satellite.

Description

technical field [0001] The invention relates to a relative navigation method for autonomous rendezvous of space non-cooperative targets, belonging to the field of spatial autonomous relative navigation. Background technique [0002] In the past 20 years, in response to the increasing shortage of earth orbit resources, in-orbit repair of faulty satellites, and orbital debris cleanup, countries have actively carried out the use of space robots (on-orbit service spacecraft or service satellites) to detect faulty satellites, orbital debris, and other space abnormalities. Cooperative targets conduct on-orbit service technology research such as surveillance, approach, capture, and life extension or de-orbit. Relative navigation is the key technology for on-orbit spacecraft services. Because of its passive measurement, CCD camera has the advantages of wide measurement range, high precision, small equipment size, light weight, and low power consumption. It is the future non-cooperat...

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Problems solved by technology

For the double-satellite formation scheme, the essence is to construct relative distance information through the measurement baseline of the double-star. This scheme requires two satellites or the service star to have the ability to release accompanying small satellites and coordinate measurement, which is difficult to achieve in practice and costly. is larger, and the smaller the angle between the observation vectors of the double star is, the lower the estimation accuracy is, and the relative distance estimation fails when the two observation vectors are parallel

In the current angle-measuring navigation method for non-cooperative space targets, it is necessary to use multiple satellite platforms to coordinate measurements or a single satellite platform to maneuver in a special orbit to improve system observability and solve the problem of poor observability in some cases where relative navigation cannot be completed. The problem

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