Novel IRIG (Inter Range Instrumentation Group)-B alternating current code intelligent decoding method

Abstract

The invention relates to a novel IRIG (Inter Range Instrumentation Group)-B alternating current code intelligent decoding method. Firstly, analog low-pass filtering is carried out on an IRIG-B alternating current analog signal with the system input frequency of 1KHz to filter out the coupled environment noise of the IRIG-B alternating current analog signal in a transmission process; the IRIG-B alternating current analog signal is converted into a digital signal through an isolation sampling circuit; high-order digital filtering is carried out on the IRIG-B alternating current digital signal in an FPGA (field programmable gate array), environment noise and sampling noise are further effectively filtered, then code pattern demodulation, phase compensation, time decoding and error code modification of the IRIG-B alternating current digital signal are sequentially carried out in an intelligent decoding module, highly reliable, highly precise and intelligent decoding on the IRIG-BAC code is realized, and the method has an error code self-modification capacity, can be widely used for ground equipment and airborne equipment of a telemetering remote control system, and provides high-precision timing with strong noise resisting capacity for ground and airborne telemetering remote control systems.

Description

technical field [0001] The invention relates to a novel IRIG-B (AC) code intelligent decoding method, which belongs to the technical field of remote measurement. Background technique [0002] The IRIG-B code is a time serial code uniformly used in the field of telemetry in China. It is widely used in measurement, control, communication, computing and meteorological equipment in the test field area to provide a unified time reference for the system. The AC code of IRIG-B is often used for long-distance transmission. Although the IRIG standard requires the output amplitude of the analog signal to reach 10Vp-p, after long-distance channel transmission, the signal amplitude has been greatly weakened, and a large signal may be introduced. Environmental noise may even cause signal distortion and bit errors. [0003] The traditional IRIG-B (AC) code demodulation and decoding equipment has relatively poor self-adaptability, poor locking performance, high requirements on signal ampl...

AI Technical Summary

Problems solved by technology

The AC code of IRIG-B is often used for long-distance transmission. Although the IRIG standard requires the output amplitude of the analog signal to reach 10Vp-p, after long-distance channel transmission, the signal amplitude has been greatly weakened, and a large signal may be introduced. Environmental noise, even signal distortion may occur, resulting in bit errors

[0003] The traditional IRIG-B (AC) code demodulation and decoding equipment has relatively poor self-adaptability, poor locking performance, high requirements on signal amplitude and signal-to-noise ratio, and it is difficult to provide highly reliable and high-precision reference time information

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