Three-channel attitude algorithm method of linear array infrared earth sensor

Abstract

The invention discloses a three-channel attitude algorithm method of a linear array infrared earth sensor. The method comprises the steps that adjacent radiation data are judged at first to obtain an integer part of a through position, then a decimal part of the through position is calculated, a single-lens linear scanning calibration test is carried out, linear fitting is carried out on a linear movement locus, sine fitting and quadratic fitting are carried out on an error term to obtain a radiometric correction formula, and the through positions of all channels are corrected; an attitude angle zero position is obtained by obtaining a track zero position calibration table, and the corresponding mode is applied to any track or an unknown track to calculate an attitude angle. Under the background that the three-channel attitude algorithm method is applied to measurement of different track attitudes, on the basis of the algorithm improving linear array infrared earth sensor measuring precision, lowering measuring deviation and losing partitive accuracy, redundancy backup in the hardware level is achieved, and the on-track using reliability is improved; in the environment with no high precision requirement, the equipment size and weight can be reduced by reducing the number of lenses.

Description

technical field [0001] The invention relates to an attitude calculation method of a space-borne infrared earth sensor, which can be used for on-orbit use of space low-orbit and orbit-changing spacecraft. Background technique [0002] The infrared earth sensor is a satellite attitude optical sensor based on the principle of infrared radiation sensitivity of the earth. It can be used to measure the pitch and roll attitude angle signals of the spacecraft relative to the local vertical of the earth, and capture and capture the earth by the spacecraft in the initial state. Attitude control of spacecraft during steady-state operation. [0003] According to whether there is a mechanical scanning mechanism inside the infrared earth sensor, it can be divided into two types: scanning type and static type: the scanning type can be divided into two types: conical scanning type (single cone, double cone) and swing scanning type, while static type can be divided into two types: There are...

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Problems solved by technology

[0006] At present, some people have proposed a method to improve its accuracy, which can indeed improve the accuracy (3σ) to a certain extent, but does not change the absolute deviation of the measurement

And because aerospace products require high reliability, anti-fuse FPGA chips are generally used for processing inside the products, making this method more difficult to apply: it is difficult for FPGAs to perform such complex multiplication and division operations, and it will far exceed the Use capacity

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