Phase-shift laser range finder is widely used in distance measurement,especially in short distance measurement. The accuracy and speed of the measurement mainly depend on the digital phase discriminator. In order to improve the accuracy and speed of the measurement,a new digital phase discriminator is presented in this paper. By adding a feedback circuit to control the modulator,the phase shift between the transmitting and receiving signals can be measured with only one digital phase discriminator,which can improve the speed and save the cost. By adjusting the parameters of CIC filter,the SNR of output signals can be maximized. By optimizing the CORDIC algorithm,the measuring range can be extended,and the accuracy and speed can be improved. The performance of the new digital phase discriminator was evaluated with Matlab. Finally,the digital phase discriminator was implemented on FPGA. Compared with the traditional ones,the accuracy and speed of the new digital phase discriminator are better.
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赵中民,习友宝.激光测距中数字鉴相器的设计[J].激光与红外,2015,45(2):133~137 ZHAO Zhong-min, XI You-bao. Design of digital phase discriminator for laser range finder[J]. LASER & INFRARED,2015,45(2):133~137