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为提高电缆测井数据传输的性能,提出一种基于HDB3码并利用CycloneⅡ系列FPGA的编、译码系统设计方案。详细分析了编译码的原理与实现方法,并在编译码实现过程中采用双相码来表示相应的码元,可以快速便捷地识别取代码,同时也解决了FPGA只能处理单极性电平的问题。在译码时特意先提取极性信息,故只需用一组移位寄存器来存放输入码流。最后给出了对应的仿真结果,并成功应用于石油测井领域的电缆测井数据通信系统研究装置中。
In order to improve the performance of cable logging data transmission, a scheme of coding and decoding system based on HDB3 codes and using Cyclone Ⅱ series FPGAs is proposed. The principle and implementation method of codec are analyzed in detail, and the two-phase code is used to represent the corresponding code in the process of codec implementation, which can quickly and easily identify the code and solve the problem that FPGA can only handle unipolar level The problem. In the decoding of the first polarity information is extracted, so only a set of shift registers to store the input stream. Finally, the corresponding simulation results are given and successfully applied to the cable logging data communication system research device in the field of petroleum logging.