Design of time-frequency synchronization circuit for shore-air bistatic radar
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School of Electronic Information, Wuhan University,Wuhan 430072, China

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TN952

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    Abstract:

    In order to realize a fully coherent shore-air bistatic radar, time-frequency synchronization between transmitting and receiving stations must be realized. The time-frequency synchronization of the coherent shore-air bistatic radar contains two parts. One part is time synchronization, that is to ensure that the transmitted signal and the local vibration signal are generated at the same time and have the same sequence. The other part is the synchronous clock source, which ensures that the DDS generating the transmitted signal and the local vibration signal has a reference clock with the same frequency and phase. Article puts forward a clock synchronization scheme that taming local high stable constant temperature crystal with satellite synchronous pulse, this scheme uses the GPS clock chip can output two signals at the same time, one output time pulse to synchronize the time between double station, the other output MHz time pulse tame local high stable constant temperature crystals in order to realize the synchronous clock source. Time synchronization makes the timing error of the double-ended signal less than 1 μs required by the system index. The synchronous clock source to tame after the local clock has less than 22 ns synchronization precision, close to the timing precision of GPS chip 20 ns, compared with the phase detection in FPGA with PPS, improves the frequency of the phase detection, therefore has the shorter tame time, and does not depend on the FPGA chip, make the system modular while saving cost.

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  • Online: January 23,2024
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