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Method for processing periodic error in inertial components

A periodic error, inertial device technology, applied in the field of inertial navigation

Inactive Publication Date: 2007-09-19
BEIHANG UNIV
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  • Description
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Problems solved by technology

[0004] The purpose of the invention is: to overcome the deficiencies of the existing periodic term error processing method, to propose a periodic term error processing method that has high precision and does not affect the working bandwidth of inertial devices and useful signals

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  • Method for processing periodic error in inertial components
  • Method for processing periodic error in inertial components
  • Method for processing periodic error in inertial components

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Embodiment Construction

[0066] The embodiments of the present invention are without loss of generality. Taking the output data processing process of a BEI GYROCHIP LCG50 quartz MEMS gyroscope as an example, the processing flow of periodic errors is shown in FIG. 1 . This embodiment processes the output data of the quartz MEMS gyroscope shown in Figure 2 for 120 seconds, and the processing steps of the periodic error are as follows:

[0067] (1) Select the output data in the first 8 seconds from the starting point as a sample to calibrate the parameters of the significant periodic error, analyze the data sample by PSD analysis method, and obtain the energy-frequency diagram as shown in Figure 3, and its frequency is sorted according to the energy size As shown in Table 1.

[0068] Significant periodic item energy (W)

Significant periodic term frequency (Hz)

1st

5147.755030

80.1286667

2nd

3982.743320

83.0761333

3rd

2614.087980

127.430...

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Abstract

A processing method of periodic errors in an inertia device is provided in the present invention. The parameters of frequency, initial phase, etc. of remarkable periodic errors are demarcated by the initial output data sampling of the device, and the online compensation in real time is performed in the subsequent time to improve the precision of the device. Wherein, the frequency demarcating process includes an initial demarcating process and a precise demarcating process. The initial demarcating determines the frequency of the periodic error items by a PSD analyzing method. The precise demarcating determines the frequency by transforming the questions into the minimum norm local optimization problems which have nonlinear multi-restriction in the optimization theory for modeling and the design of the arithmetic. The performing of the method is quick and exact and has a high precision without influencing the bandwidth and useful signals. The method is especially adequate for the periodic error processing of the high-frequency and over-sampling data of the inertia device and is also adequate for the processing of data including periodic errors in other fields.

Description

technical field [0001] The invention belongs to the technical field of inertial navigation, in particular to a processing method for periodic errors in high-frequency sampling data of inertial devices, and is also applicable to data processing containing significant periodic errors in the fields of communication, electronics, signal processing and the like. Background technique [0002] Inertial device is a kind of precision instrument, and its output data is required to contain as little error as possible, and the output accuracy is as high as possible. In order to obtain high-precision output data of inertial devices, the steps of testing, calibration and compensation of various parameters involve a lot of error processing work. Accuracy and so on the impact of various precision. However, the output data of inertial devices often contains periodic errors, and the periodic errors in the oversampled data of some inertial devices may be very significant. Especially in recen...

Claims

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Application Information

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IPC IPC(8): G01C21/16
Inventor 房建成张海鹏崔培玲曹娟娟荀向东马珍珍
Owner BEIHANG UNIV
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