PCM遥传信号数字解码方法的设计与实现

Design and realization of software decode for PCM telemetry signals

通过用软件对PCM编码数据进行解码的方法 ,设计了根据实际波形实时设置鉴别电平和数据判别宽度的抗干扰措施 ,并在ERA2 0 0 0成像测井地面系统中实现了此方法。采用VxWorks的信号量同步机制 ,实现了多任务之间的同步和通讯 ,保证了系统采集的可靠性和实时性。

The means of decoding PCM signal is given in this paper. The PCM telemetry signal was converted by high speed A/D and decoded by software. Measure of identifying voltage level and width of signal can be designed real timely on the basis of PCM signals. This method has already been realized in ERA2000 imaging logging system. VxWorks semaphores are highly optimized and they provide the fastest intertask communication mechanism in VxWorks. Semaphores are the primary means for addressing the requirements of both mutual exclusion and task synchronization. Therefore, the system runs stably and normally.