Design Of New Generation Of IRIG-B Code Time System Client

When interconnected system the terminal last time basis, its function is: IRIG-B one yard of signals sent stands in the interconnected system while receiving;Time information to produce demodulation IRIG-B the yards, it finish with when interconnected system stand last IRIG-B yards of synchronisms of information;Loop back one IRIG-B yard that No. Modulate, interconnected system stand, delay time, check with demodulation checking, spending support, To observe and control various frequency signal, time information and various that apparatus' sending need sample pulse signal, so as to ensure to observe and control certainly holding unanimity with the time base of the shooting range regularly of apparatus.The interconnected system adopts the demodulation of hardware terminally, basically adopt and separate the component and small-scale integrated circuit when being common, structure complicated, integrated level low, cause performance to be unstable dependability bad, common ability and maintainability poor.IRIG-B one yard of interface terminal station used at present because adaptation is indifferent, it is too tight to exchange the yard (AC) wave form quality requirement of the signal in inputting IRIG-B, and IRIG-B got to receive exchange yard signal satisfied with these kind of requirement often in fact, it can't appear by demodulations normal decipher so often and when rise and fall more heavy prolonging value.So, while adopting digital demodulation technology, we have improved on the demodulation method, so as to improve the demodulation precision and demodulation tempo of IRIG-B yard, strengthen the adaptive capacity of IBIR-B with terminal interface. Interconnected system terminal to adopt top-grade one-chip computer go on digital demodulation when the develop newly, demodulation IRIG-B when the yard, remove adopt usually gain control circuit, A/D mouth to adopt one-chip computer automatically, realize software andsgains control, simplified the hardware, has widened the systematic demodulation range, make its adaptability stronger.Use PC as and control the core with data processing, utilize the extremely abundant software and hardware resources of the PC and the good interactive interface, the ones that enable the instrument are intelligent and is improved.The PC should finish some real-time calculation besides finishing controlling the function within various apparatus. In when add can last PC by interconnected system the control abilities internal and externals of the apparatuses when being raise among interconnected system the apparatus, measure precision and dependability;Can strengthen recording the function in real time of apparatus;Can simplify the operation of the apparatus, make the apparatus have certain intelligence. In addition interconnected system apparatus new expansion of function prepares the terms.This system adopts digital demodulation technology, adopt A/D mouth of one-chip computer exchange IRIG-B yard (AC) transform into the figure amount, realize digitized treatment directly, and carry on digitized demodulation. Overcome, gain, control linear range that circuit bring narrow, apt distorted distortion automatically, it is slow to respond, the long shortcoming of time of demodulation. Have dispelled and gained and controlled (AGC) the influence with complicated structure, with bad dependability that the circuit brings automatically, and can discern the phase place automatically, improve to IRIG-B one yard of adaptive capacity with terminal interface and obtain ability of information of correct time.While adopting the extensive programmable logic device to realize repairing, frequency division, IRIG-B yard and various synchronous signals which produces demodulation, usually replace integrated circuits such as more than 20 blocks of counters, circuit of the door and latch, etc., make up the shortcoming with complicated, great in volume, with bad dependability and with bad common ability circuit after overcoming the small-scale integrated circuit. It is reliable to make the terminal integrated level of interface higher, simpler. And can followusers' on the spot programming of demand, the common ability is strong.Through analyzing the shortcoming that original digital demodulation technology exists, propose the demodulation technology of IRIG-B yard of new generation pointedly, carry on the overall design of the hardware, including inputting unit circuit, decoding unit circuit, circuit of uniting and interface of communication, modulating unit circuit, PC seek location unit design of circuit to communication interface;Design of systems soft ware, 80C196 main program, decode procedure, ENINT cut off procedure , 80C196 clusters of mouth cut off procedure , PC procedure ,etc.Use digital demodulation technology, not only it is simple to design the circuit, but also the realization of this technology, have improve IRIG-B one yard of dependability of demodulation and IRIG-B one yard of adaptive capacity of demodulation, has guaranteed the demodulation precision.The experiment circuit herein can also be used in other apparatus of interconnected system while observing and controlling the systematic one.The digital demodulation technology herein, has reference value as to each other application.