The crosstalk between transducers can seriously restrict the accuracy of ultrasonic ranging system.To eliminate ultrasonic crosstalk

the Chaotic Pulse Position Modulation(CPPM)is used to construct the short triggering sequence for each ultrasonic transducer.The correlation analysis is applied to identify the echo sequence.The crosstalk sources are analyzed.The relation between pulse’s duty cycle and energy of harmonic components are deduced.To obtain the optimal correlation performance

the genetic algorithm is adopted to optimize the duration between pulses modulated by Logistic chaotic mapping.The proposed method is validated on a DC-DC fired electrostatic ultrasonic ranging system.The results demonstrate that the CPPM can be used to eliminate the crosstalk of the real-time ultrasonic ranging system provided that the duration between pulses is adjusted properly.