多点定位接收机的设计与实现

Design and Implement of Multipoint Positioning Receiver

为解决民用航空多点定位系统中多个远端站的时间同步问题,完成对广播式自动相关监视系统(automatic dependent surveillance-broadcast,ADS-B)信号到达时间信息的提取,设计一款高精度低成本的多点定位接收机。由于到达时间差(time difference of arrival,TDOA)的精度主要由时间同步和报头检测的精度决定,提出基于驯服时钟的分布式授时方法和具有动态门限值的报头检测算法来提高TDOA的精度,从而提高接收机的精度,通过Taylor级数展开法验证,表明接收机的TDOA精度达到了预期要求,最后完成接收机的硬件和软件实现。

In order to solve the time synchronization problem of multiple remote stations in civil avi-ation 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 posi-tioning receiver.Due to the fact that the accuracy of time difference of arrival(TDOA)is mainly determ-ined 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 im-prove the accuracy of TDOA and thus enhance the accuracy of the receiver.Then,the Taylor series expan-sion method was used to verify that the TDOA accuracy of the receiver met the expected requirements.Fi-nally,the hardware and software implementation of the receiver were completed.