Modeling of FMCW lidar detection technology based on optisystem

Nowadays, with the continuous development of science and technology, people's requirements for ranging accuracy and detection speed are also increasing. Based on the principle of frequency modulated continuous wave (FMCW) lidar ranging, a simulation ranging scheme is designed and a simulation model is established. The system is modeled and simulated by optisystem software, The relationship between frequency modulation (FM) time, FM bandwidth and measuring distance accuracy is studied, and the effects of different scanning parameters on the final measurement distance and measurement accuracy are discussed from two aspects of time and frequency. The time delay of the target at 30m, 60m and 90m when the frequency modulation bandwidth is 300Mhz is simulated and tested, and the time delay at 30m when the frequency modulation bandwidth is 50m, 100m and 200m is tested. The distance can be deduced by processing the frequency of echo signal and local oscillator signal and calculating the frequency of beat. It has great advantages in detection accuracy and detection speed.