Design and Implement of Multipoint Positioning Receiver

In order to solve the time synchronization problem of multiple remote stations in civil aviation multi-point positioning systems and extract the arrival time information of the automatic dependent surveillance broadcast (ADS-B) signal, this paper designs a high-precision and low-cost multi-point positioning receiver. Due to the fact that the accuracy of time difference of arrival (TDOA) is mainly determined by time synchronization and header detection accuracy, a high-precision distributed timing method based on tamed clocks and a header detection algorithm with dynamic threshold values is proposed to improve the accuracy of TDOA and thus enhance the accuracy of the receiver. Then, the Taylor series expansion method was used to verify that the TDOA accuracy of the receiver met the expected requirements. Finally, the hardware and software implementation of the receiver were completed.