A real time transmission system of long distance for nuclear logging

Some specified chips in traditional Manchester-II encoding/decoding designs are used to guarantee strictly the stability of the input wave, otherwise the capacity of anti-interference and resilience are degraded seriously. In this paper, a new Manchester-II encoding/decoding system is used for nuclear logging by a 7 000 m armoring cable. A thorough hardware wave tracking decoding algorithm is proposed and realized in a FPGA hardware chip. An on-site measurements show that this transmission system can decode correctly in real time, with a bit error rate of better than 10 10.