A Two-channel Attitude Calculation Method for Linear Array Infrared Earth Sensor

Abstract

The invention discloses a double-channel attitude resolving method for a linear array infrared earth sensor. The method comprises the steps that firstly, adjacent radiation data are judged, and the integral part of a traveling position is obtained; then, the decimal part of the traveling position is calculated, a linear fitting is carried out on a linear motion track through a single-lens linear scanning calibration test, sine fitting and quadratic fitting are carried out on an error item to obtain a radiometric correction formula, and the traveling positions of all channels are corrected. A track zero calibration scale is obtained, an attitude angle zero position is obtained, and a corresponding mode is applied to any track and unknown tracks to resolve attitude angles. Under the background that the method is applied to measuring different track attitudes, based on the algorithm of improving the measuring precision of the linear array infrared earth sensor and reducing measuring errors, under the condition of losing part of the precision, redundant backup on the hardware level is achieved, and the reliability of on-track use is improved. In the use environment with the low precision requirement, the number of lenses is reduced to be the minimum, and the size and mass of the linear array infrared earth sensor are reduced to the maximum degree.

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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