该程序通过PN码来实现无源定位的功能，有三个基站，分别计算目标距三个基站的时间，从而得出目标的坐标-the procedures adopted to achieve the PN passive positioning functions, the three base stations, Goals were calculated from the three base stations, thereby reaching the target coordinates

设系统中有P个进程，各进程向其左边的进程发送一个消息（进程P0发给Pn-1），各个进程接收到消息之后，输出一条消息：“我是进程i，我收到了进程i+1的消息，消息内容是……。-P a set system in the process, the process, the process left him to send a message (process P0 distribution Pn-1), each process receives the message, the output of