Method for determining relative attitude of microsatellite by using dual array antenna

Abstract

The invention discloses a method for determining a relative attitude of a microsatellite by using a dual array antenna. A relative attitude dynamics equation is used as a system equation to form a probe frame, and then a transmitting and receiving timing sequence is designed; two array antennas of a main spacecraft receive a transmitted signal from a slave spacecraft array antenna which is used asan output signal, and moving correlation is carried out according to the output signal and a probe signal, so as to obtain an array impulse response matrix; two-dimensional spectral peak search is performed to obtain two sets of wave leaving angles and wave arrival angles; four unit line-of-sight vectors are obtained by using the two sets of wave leaving angles and wave arrival angles; a measurement equation is constructed by using the bidirectional unit line-of-sight vectors and a relative attitude rotation matrix to obtain a measurement noise variance matrix; the TRIAD algorithm is used toobtain an attitude quaternion at the initial moment; and then the relative attitude and a relative rotational angular velocity which are convergent gradually are obtained according to the system equation and the measurement equation. The method for determining the relative attitude of the microsatellite by using the dual array antenna has low computational complexity, high estimation precision andwide application range.

Description

technical field [0001] The invention belongs to the technical field of determining the relative attitude of micro-satellite formations, and in particular relates to a method for determining the relative attitude of micro-satellites by using dual array antennas. Background technique [0002] Microsatellites have a series of advantages such as light weight, small size, high technical content, and short development cycle. In addition, they can also adopt modular design technology and standardized stars, mass-produce and store them on the assembly line, and facilitate mobile launches. It is also possible to use new technological achievements such as distributed constellations, formations, or the introduction of artificial intelligence, and use smart constellations to complete more complex application tasks, which cannot be accomplished with traditional large satellites. Therefore, microsatellites are widely used in military or civilian fields, including commercial communications...

AI Technical Summary

Problems solved by technology

Because this method requires additional sensors and light sources for the spacecraft, it inevitably increases the size of the spacecraft, which is not suitable for tiny satellites, and this method is used when the distance between the master and slave spacecraft is very large. will no longer apply

In addition, there is a method of using the camera to identify feature points for attitude determination. This method requires a very complex and good image processing method. This method also has high requirements for illumination. When the spacecraft is in the shadow area, this method fail

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