【摘要】 本文提出了一种应用于油井测斜遥传系统的Manchester码信道解码方式的实现方案。Manchester码是串行数据传输的一种重要的编码方式,具有丰富的时钟信息。本方案通过FPGA平台和由硬件语言Verilog实现的超前—滞后型全数字锁相环(LL-DPLL)实现了Manchester码解码器的设计,它解决了接收端解调时的时钟同步问题,可以动态跟踪时钟,为遥测系统中数据传输准确性的提高提供了可靠的保证。实验结果表明:此解码器能很好地提取时钟,在数据传输上误码率也小于10-5,满足设计要求。跟模拟电路设计相比,该设计更易于与原有系统集成、实现方便、性能稳定;同时比同步脉冲法等其他数字方法的抗干扰性能上也有明显的提高。更多还原

【Abstract】 A technique for channel decoder applied for the FOG inclinometer telemetry system is introduced.Manchester is an important encoder technique in the serial transmission and it has corresponding clock information.The project,which combines FPGA with LL-DPLL that is realized by Verilog HDL,can work out solutions to the problem of clock synchronization in the receiver.It can track the clock dynamically and ensure that it can improve the precision of digital transmission in inclinometer telemetry system.Lab experiments prove that the decoder can record the clock synchronously with the BER of digital transmission lower than 10-5,which meets the design request.Compared to other analog circuits,the project is characterized by easy integration with other system,convenient implementation and steady performance.Meanwhile,the project also has better performance in the aspect of anti-jamming than other digital methods.更多还原