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High-frequency angular displacement sensor installation parameter on-orbit calibration method and system

An angular displacement sensor and installation parameter technology, applied in the field of remote sensing satellite ground data processing, can solve problems such as gross error, measurement noise installation parameters, calibration, etc., and achieve the effect of ensuring data quality and reliability

Active Publication Date: 2021-02-23
WUHAN UNIV
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Problems solved by technology

[0003] Aiming at the problems of gross error, measurement noise and installation parameter calibration in the original observation data of high-frequency angular displacement, the present invention provides an on-orbit calibration method for installation parameters of high-frequency angular displacement sensor

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  • High-frequency angular displacement sensor installation parameter on-orbit calibration method and system
  • High-frequency angular displacement sensor installation parameter on-orbit calibration method and system
  • High-frequency angular displacement sensor installation parameter on-orbit calibration method and system

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Embodiment Construction

[0026] The technical solution of the present invention will be described in detail below in conjunction with the drawings and embodiments.

[0027] The invention uses FIR filtering and segmented FFT transformation to realize high-frequency angular displacement data preprocessing, improve the quality and continuity of original observation values, and calibrate the angular displacement component measurement coordinate system and star sensitivity based on the angular displacement installation parameters on-orbit calibration model. The relative installation parameters between the reference coordinate systems, and the reference of the unified optical remote sensing satellite attitude measurement system.

[0028] see figure 1 , a high-frequency angular displacement sensor installation parameter on-rail calibration process provided by an embodiment of the present invention includes the following steps,

[0029] Step 1: Use a finite-length unit impulse response filter (Finite Impulse...

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Abstract

The invention provides a high-frequency angular displacement sensor installation parameter on-orbit calibration method and system. The method comprises the following steps: carrying out noise reduction processing on originally observed high-frequency angular displacement data by adopting FIR; using a piecewise Fourier transform algorithm to suppress noise data, carrying out threshold processing ondata amplitude information, and realizing recovery and quality improvement of high-frequency angular displacement data; resolving a satellite body attitude quaternion time sequence to obtain a satellite body angular increment reference value time sequence; performing time accumulation processing on the obtained body angle increment observation value after quality improvement to obtain a body angle increment measurement value time sequence unified with a satellite body angle increment reference value time sequence time reference; establishing a high-frequency angular displacement on-orbit installation parameter calibration model, and solving an installation parameter error value by using a least square optimal estimation method; and carrying out iterative calculation till that a high-frequency angular displacement installation error correction value is smaller than a set threshold so that a high-frequency angular displacement installation parameter on-orbit calibration result can be obtained.

Description

technical field [0001] The invention belongs to the field of ground data processing of remote sensing satellites, and relates to an on-orbit calibration method and system for installation parameters of a high-frequency angular displacement sensor. Background technique [0002] The high-frequency angular displacement sensor can output angular increment data of tens of thousands of Hz, and the frequency range of the platform attitude that can be sensed can reach 0.2-1000 Hz, and can maintain high measurement accuracy when the satellite is moving at high speed. Satellite high-frequency high-precision attitude data processing provides a new idea and method. However, due to the high sampling frequency of angular displacement data, the quantization noise in the observation data is significant, and the real angular increment information of the satellite platform is covered up; moreover, there are various systematic and accidental errors in the original observation data of high-freq...

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Application Information

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IPC IPC(8): G01C25/00
CPCG01C25/00
Inventor 朱映王艳丽王密
Owner WUHAN UNIV