Anti-interference laser ranging system based on chaotic time delay

Aiming at the time-of-flight (ToF)-based laser ranging technology which is susceptible to high-frequency interference pulses, this study proposes an anti-interference laser ranging system based on chaotic time delay. The system adopts a field-programmable gate array (FPGA) and superimposes a random time delay based on Lorenz chaotic system on the periodic pulse signal, which effectively circumvents the continuous interference generated by interference pulses to the ranging system. In the experimental part, we set the repetition frequency of the chaotic time-delayed pulse signal to 50 kHz and the pulse width to 10 ns. The periodic interference pulses were tested in the range of 200 kHz to 300 kHz with a test interval of 10 kHz. 1000 measurements were taken under each experimental condition to count the probability of success in ranging. The experimental results show that the probability of success reaches 99.89% on average under the interference of periodic pulses from 200kHz to 300kHz. This result proves that the proposed anti-jamming laser ranging system has a good ability to resist interference under high-frequency pulse interference conditions.