Method for improving altitude measurement precision of linear array static infrared horizon sensor

Abstract

The invention discloses a method for improving precision of a spaceborne linear array static infrared horizon sensor. The method comprises the following steps of initial judgment of an earth-space boundary position, selection of a reference signal, normalization of a detector signal, selection of a boundary judgment element, high-precision detection of the earth-space boundary position, and high-precision altitude calculation. Combined with the characteristics of the horizon sensor and based on the characteristic that a detection element signal corresponding to a transition zone changes regularly with the movement of the earth-space boundary in a field of view of the detector, the invention creatively provides a method for locating the earth-space boundary position highly precisely by the boundary judgment element to improve the measurement precision of the horizon sensor. By the invention, the problem that an instantaneous field of view angle of a detection element, the measurement precision and the altitude measurement range are restricted mutually in the design of the conventional horizon sensor is solved. The method has the characteristics of small calculation quantity and high generality, and is easy to implement, so the method can be applied to spaceborne linear array static infrared horizon sensors with different orbit heights.

Description

technical field [0001] The invention relates to a spaceborne infrared horizon, in particular to a method for improving the attitude measurement accuracy of a line array static infrared horizon. Background technique [0002] The infrared horizon (or called the infrared earth sensor, referred to as the horizon) is based on the principle of being sensitive to the infrared radiation of the attitude reference source, the satellite attitude optical sensitivity that realizes the measurement of the satellite's rolling and pitching attitude information relative to the local vertical line in orbit. device. According to whether the horizon includes a mechanical scanning mechanism, the horizon can be divided into two types: scanning and static; scanning horizon can be divided into two types: conical scanning and swing scanning; static horizon is divided into two types: line array and area array. . [0003] Since the United States GoodRich company developed the world's first infrared s...

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Problems solved by technology

[0018] The purpose of the present invention is to improve the attitude measurement accuracy of the horizon without changing the optical-mechanical structure and electronic hardware of the existing line array static infrared horizon, and to solve the mutual constraints between the instantaneous field of view of the detection element, the measurement accuracy, and the attitude measurement range The problem

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