基于FPGA和DSP的激光陀螺信号处理电路设计

研究机械抖动激光陀螺的信号读出系统,设计激光陀螺的信号处理电路。光电转换后的微弱电流信号经过前置放大电路转化为电压方波信号,在FPGA中进行鉴相解调以及可逆计数,最后由DSP实现机抖偏频解噪和低通数字滤波。与激光陀螺联合测试并将结果输出至上位机,结果表明设计的电路实现了对激光陀螺输出信号的有效采集,满足激光陀螺功能测试的需要。

Design of signal procession circuit of laser gyro based on FPGA and DSP

Based on the study of the readout signal system of mechanical jittering laser gyro, a signal procession circuit of laser gyro was designed. Through a pre-amplifier circuit after photoelectric conversion, a weak current signal is converted to a voltage square wave signal, which then achieved function of phase-demodulation, frequency multiplication and reversible counter via the FPGA. The data from the output of FPGA are collected and processed with mechanically dithered solution-to-noise and a low-pass digital filter in DSP. Testing with a laser gyro and exporting the results to host computer, the results show that the design of the circuit realized output signal acquisition of laser gyro and meets the need for functional testing of a laser gyro.