Autonomous navigation system for on-orbit aircraft

Abstract

The invention provides an autonomous navigation system for an on-orbit aircraft. The autonomous navigation system is composed of a strapdown inertial measurement unit, a satellite receiver, a large-view-field star sensor, an ultraviolet sensor and a computer and is an inertia, satellite, starlight, ultraviolet and computer system for short); when the aircraft is located at middle and low earth orbits, an inertia, satellite and starlight combined navigation system is adopted and the ultraviolet is a backup device for positioning and determining postures; when the aircraft is located at a high earth orbit, an inertia, ultraviolet and starlight combined navigation system is adopted so that the problem of an existing satellite receiver that the positioning accuracy at the high orbit becomes bad or the positioning can not be realized is solved. The autonomous navigation system is independent of a ground measurement and control station and the long-time on-orbit autonomous navigation requirements of a spacecraft performing a multi-star deploying task are met, so that the high-accuracy autonomous navigation of the aircraft at the lower and middle earth orbits is realized. The technology can be applied to the autonomous navigation aspect of on-orbit services and multi-star deployments of the spacecraft.

Description

technical field [0001] The invention relates to an autonomous navigation system for an on-orbit aircraft, which belongs to the field of aircraft navigation. Background technique [0002] Navigation refers to the technology and method of providing real-time attitude, speed and position information to the carrier. Autonomous navigation of spacecraft is the premise and basis for autonomous operation and precise control of spacecraft. It is a technology for spacecraft to determine its own position, speed and other navigation parameters in real time only by relying on spaceborne navigation and measurement equipment. It does not need to rely on ground observation stations, which greatly improves the mobility, concealment, anti-interference and survivability of the satellite system. There are three main methods of autonomous navigation for spacecraft: inertial navigation, satellite navigation, and astronomical navigation. Now all space powers are actively developing autonomous nav...

AI Technical Summary

Problems solved by technology

But INS has a fatal shortcoming: navigation and positioning errors accumulate over time

Celestial navigation has the advantages of good concealment and strong autonomy, but its orbit determination accuracy is low. The orbit determination accuracy of high-orbit satellites is generally on the order of hundreds of meters. According to the data, X-ray pulsar navigation can reach the accuracy within 100 meters. ; The accuracy of starlight attitude determination is high, but its navigation data rate is low; in some cases, it will be affected by the external environment, and the output information is not continuous, etc.

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