A high-precision time synchronization system delay attack detection system and method

Abstract

The application discloses a high-precision time synchronization system delay attack detection system and method, and belongs to the field of time-frequency detection. The detection system comprises a near-end clock source, an optical transmitting module, a circulator, a multiplexing module, a first photoelectric detector, a delay compensation module and a time measurement module; a far-end circulator, an EDFA, a beam splitter, a second photoelectric detector module and a monitoring module; and an optical fiber link connecting the near end and the far end; an attack module is added in the optical fiber link to simulate the state of the link under attack, and whether the link is attacked is judged by measuring the time difference of the pulses arriving at the far end. Assuming that the pulse width sent by the near end is τ, when the link is not attacked, the time difference between the front falling edge of the pulse arriving at the far end and the rear rising edge of the adjacent pulse is 1-τ; when the link is attacked, assuming that the time of signal light transmission through the attack module part is μ, at this time, the time difference between the adjacent pulses arriving at the far end becomes 1+μ-τ when attacked. Since the signal jitter in the transmission process is about several hundred picoseconds, and the added attack is greater than the accuracy, the link attack can be accurately judged. The application can judge whether the link is attacked in time and can react to the attack in time.

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