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在航天电子设备中,需要为电子设备提供统一的时间信息,以便对设备信息进行时间校正。因此需要研制高精度的时间解码装置,为电子装备试验提供精确的统一时间基准。提出了一种IRIG-B的AC码解调出DC码的方法,然后从DC码中解码出时、分、秒信息。整个解码过程用FPGA及其外围电路实现。与以往的各种方法相比,该解码方法具有灵活性、开放性、简单实用、体积小、功耗低的优点,同时提高了同步精度,具有较强的抗干扰性。该设计方案在以Altera的EP3C5F256I7为核心器件的硬件平台上得到验证。
In aerospace electronics, there is a need to provide electronic devices with uniform time information for time correction of device information. Therefore, the need to develop high-precision time decoding device for electronic equipment testing to provide accurate uniform time base. A method of demodulating DC code from AC-code of IRIG-B is proposed, and the time, minute and second information is decoded from DC code. The entire decoding process using FPGA and peripheral circuits. Compared with the previous methods, the decoding method has the advantages of flexibility, openness, simplicity and practicality, small size and low power consumption, and simultaneously improves the synchronization accuracy and has strong anti-interference. The design is validated on a hardware platform based on Altera’s EP3C5F256I7.