Tether length correction method and system in tether releasing process

Abstract

The invention discloses a tether length correction method and system in a tether release process. The method comprises the following steps: dividing the whole tether release process of a tethered satellite system into three stages: an acceleration stage, a constant speed stage and a deceleration stage; determining the tether speed fluctuation quantity and the tether length fluctuation quantity; judging whether the tether length fluctuation quantity meets a preset condition or not; and according to a judgment result of the tether length fluctuation quantity and a preset condition, selecting the tether speed fluctuation quantity or the tether length fluctuation quantity, and correcting the expected release time of the constant-speed section in combination with the sampling lengths of the acceleration section and the deceleration section to obtain the actual release time of the constant-speed section. The expected release length of the acceleration section is compared with the actual release length, the possible actual release length of the deceleration section is estimated in advance, the tether length deviation generated by the acceleration section and the deceleration section is corrected at the constant speed section, passive adjustment of the release length of the tether is achieved, a series of problems caused by re-adjusting the release speed of the tether after the tether is released in place are avoided, and rope length control in the release process is simplified.

Description

technical field [0001] The invention belongs to the technical field of control, and in particular relates to a method and system for correcting the length of a tether during release. Background technique [0002] Tether assemblies are usually launched into orbit as an assembly. The tether is gradually released in orbit until it reaches a given length, forming a stable tether system. Tether release procedure, usually given a desired release length. In order to satisfy the release process as smooth as possible, the release process needs to be planned. [0003] Due to the time delay, fluctuation and random error of the tether release device, the actual tether release speed and release length have certain deviations from the expected values. The tether releases that can be found in the current literature usually do not directly consider the tracking error of the tether release device, that is, the deviation between the actual release length and the expected length is not cons...

AI Technical Summary

Problems solved by technology

[0003] Due to the time delay, fluctuation and random error of the tether release device, the actual tether release speed and release length have a certain deviation compared with the expected value

The tether releases that can be found in the current literature usually do not directly consider the tracking error of the tether release device, that is, the deviation between the actual release length and the expected length is not considered

[0004] In addition, in order to correct the tether length deviation in the release process, the current literature usually adopts closed-loop control of the tether length after the release is in place; on the one hand, it is necessary to reintroduce the recovery or release action of the tether release device, which will damage the system stability; on the other hand , adjust the release speed of the tether, which may introduce tension and cause disturbances to the attitude of the parent star and the child star

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