Research on Design of Accelerometer Data Sampling Circuit and Its Temperature Compensation Technology
The output of the accelerometer is analog current signal. In practical application, an accelerometer data sampling system is required to convert analog signal into digital signal which can be processed by the navigation computer. Firstly, in view of the miniaturization requirement of the accelerometer data sampling circuit, an accelerometer data sam-pling circuit based on the analog-to-digital conversion is designed. The designed circuit board size is 40 mm × 40 mm. Sec-ondly, aiming at the problem of the temperature compensation for the accelerometer data sampling, the circuit high and low-temperature experiments are carried out, and the experimental data of the bias and the scale factor with temperature and in-put current variation are obtained. A static temperature compensation model between -20℃ ～40℃ is established by using the polynomial fitting, BP neural network fitting, PSO-BP neural network fitting and ACO-BP neural network fitting, which can achieve real-time on-line temperature compensation for the circuits. After compensation, the temperature stability of ze-ro bias is 10μg, the temperature stability of the scale factor is better than 5 × 10 -6 , and the nonlinearity of the scale factor is reduced to less than 4 × 10 -6 , which demonstrates the correctness and effectiveness of the temperature compensation model.
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