关键词: 时间同步精度, 北斗2导航系统, 秒脉冲, 现场可编程门阵列

Abstract:

To deal with the problems of time and pulse lager synchronization in the process of CCD (Charge Coupled Device) camera capturing laser spot images,
 an advanced forecasting method to trigger CCD camera synchronously to capture images of high-precision clock source is proposed. This device used the UTC(Universal Time Coordinated) and high-precision PPS (one-Pulse Per Second) as synchronous clock reference source provided by BD2 (BeiDou2 navigation satellite system)/GPS (Global Positioning System) dualmode receiving unit. Ensured the synchronization capture time of the CCD camera in combination with high-speed FPGA (Field Programmable Gate Array) computing and microprocessor interface timing technology, thus accomplished the synchronization trigger action. The experiment shows that this device can provide microsecond level synchronization accuracy and standard timing information, shorten the exposure time of the CCD camera effectively, get a complete clear pulse laser spot image with a higher SNR(Signal-to-Noise Ratio).

Key words: time synchronization accuracy, BeiDou2 navigation satellite system, pulse per second(PPS), field programmable gate array(FPGA)