Anti-jamming Quartz Flexible Accelerometer Signal Sampling System and Compensation Calculation Method

Abstract

The invention discloses an anti-interference quartz flexible accelerometer signal sampling system, which includes an accelerometer. The invention also includes an I / V conversion module, a preamplification module, a switch module, a differential amplification module, an AD conversion The accelerometer is connected to the FPGA main control module through the I / V conversion module, preamplifier module, switch module, differential amplifier module and AD conversion module in turn, and the input terminal of the differential amplifier module is connected to the FPGA main control module. The input terminals of the modules are connected to the reference voltage output module, the output terminal of the FPGA main control module is also connected to the input terminal of the differential amplifier module through the compensation feedback loop, the FPGA main control module is also connected to the switch module, and the switch module is also connected to the reference voltage output The modules are connected. The invention adopts the anti-interference quartz flexible accelerometer signal sampling system with the above structure, and by adding a compensation circuit, it can effectively compensate the zero position and scale of the circuit, reduce the influence of the environment on the measurement result, and increase the anti-interference performance.

Description

technical field [0001] The invention relates to a signal acquisition technology, in particular to an anti-interference quartz flexible accelerometer signal sampling system and a compensation calculation method. Background technique [0002] Quartz flexible accelerometers are widely used in measurement and control systems such as low-frequency vibration calibration and inertial navigation due to their high resolution, high stability and high precision. The traditional quartz flexible accelerometer outputs analog current, part of which adopts the IF (current frequency) scheme, that is, the final digital information can only be used by the system after the analog-to-digital conversion is completed by the IF conversion circuit. The time stability, temperature stability and symmetry of the flow source have very high requirements, so the manufacturing cost is increased; the other part adopts the FPGA (programmable main control integrated circuit) scheme, which will generate noise ...

AI Technical Summary

Problems solved by technology

The traditional quartz flexible accelerometer outputs analog current, part of which adopts the IF (current frequency) scheme, that is, the final digital information can only be used by the system after the analog-to-digital conversion is completed by the IF conversion circuit. The time stability, temperature stability and symmetry of the flow source have very high requirements, so the manufacturing cost is increased; the other part adopts the FPGA (programmable main control integrated circuit) scheme, which will generate noise due to different sampling points, Noise will affect the accuracy of the system. At the same time, DC drift will be generated during the working process. The DC drift has a great impact on the zero position and scale of the acceleration output, so that the AD zero position and scale will change with time, environmental factors and other factors.

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