A method for estimating delay time of accelerometer measurement channel based on modulation function
A technology of accelerometer and modulation function, which is applied in speed/acceleration/shock measurement, testing/calibration of speed/acceleration/shock measurement equipment, and measurement devices, etc. It can solve the problem of inconsistency in the timing of input and output data of the accelerometer
Active Publication Date: 2019-03-01
BEIJING UNIV OF CHEM TECH
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The invention solves the problem of inconsistency in the time series of the input and output data of the accelerometer, obtains the data with consistent time series, and directly performs parameter identification on the continuous time dynamic model of the accelerometer, avoids the error introduced by the discretization of the model, and improves the parameter identification of the dynamic model of the accelerometer precision
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[0070] According to the formula (1) and formula (2), the triangular modulation function and its derivative are constructed, and m=7, the waveform diagram of the triangular modulation function and its derivative is as follows figure 2 shown.
[0071] The piezoelectric accelerometer shock excitation device established by the absolute method shock calibration standard was used to obtain the experimental data, and the sampling frequency was 10MHz. The time-domain waveform of the input and output signals of the measured accelerometer is as follows: image 3 As shown, it can be clearly observed that the input signal lags behind the output signal, and there is an obvious measurement channel delay time in the calibration process.
[0072] Using the constructed triangular modulation function, according to formula (4) and formula (5), the modulation function integration of the shock excitation time series and the accelerometer response time series is obtained respectively, and the int...
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The invention discloses a method for estimating the time delay of a measuring channel of an accelerometer based on modulation function and belongs to the field of measuring and control technology. According to the invention, the method is directed at time delay of the measuring channel in the process of absolute calibration of the accelerometer. The method includes the following steps: constructing a modulation function, converting a differential equation which represents dynamic characteristics of the accelerometer into an accelerometer continuous time dynamic model which contains the time delay of the measuring channel; and minimizing a prediction error criterion function, estimating parameters of the accelerometer continuous time dynamic model. According to the invention, the method addresses the inconsistency of input and output data of the accelerometer and can obtain data with time sequence consistency, can directly identify parameters on the accelerometer continuous time dynamic model, avoids errors introduced by discretization of the model, and increases the identification precision of the accelerometer continuous time dynamic model.
Description
technical field [0001] The invention relates to a method for estimating the delay time of an accelerometer measurement channel, which belongs to the technical field of measurement and control, in particular to a method for estimating the delay time of an accelerometer measurement channel based on a modulation function. Background technique [0002] As an inertial measurement device, the accelerometer is widely used in aerospace, vehicle engineering, machinery and other fields. The dynamic model of the accelerometer has important significance and application value for the test and analysis of its dynamic characteristics. [0003] The existing accelerometer dynamic model parameter identification method assumes that there is no time delay in the signal measurement process. In fact, both the excitation signal acquisition channel and the response signal acquisition channel of the accelerometer have signal time delay. The time delay of the measurement channel is affected by the exp...
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IPC IPC(8): G01P21/00
CPCG01P21/00
Inventor 王建林白银行魏青轩于涛
Owner BEIJING UNIV OF CHEM TECH