Design and implementation of laser TT&C system based on QPSK digital coherence system: Invited Paper

The traditional microwave TT&C system is difficult to further improve the measurement accuracy and transmission rate, a high-precision ranging, velocity measurement and communication integration method based on the system under the optical carrier is proposed. Taking advantage of the high rate of QPSK digital coherent communication, the time division multiplexing information frame format is set, combined with two-way one-way ranging and incoherent velocity measurement, Under a single optical carrier, the bit level high-precision ranging signal is obtained through the regenerative clock in laser communication, which realizes the integration of laser high-speed communication and high-precision measurement, and improves the integration of optical channel; The principle prototype is developed, which includes optical antenna and electrical terminal. The measurement and control modes of inter satellite bidirectional incoherent laser link and satellite ground bidirectional incoherent laser link are verified. The results show that under the condition of wireless optical channel, the ranging accuracy reaches 0.78cm@6kHz Doppler dynamic, speed measurement accuracy reaches 01.236cm/s@6kHz Doppler dynamic, bit error rate is better than 1E-9@10Gbps(under single channel), this paper can provide reference for the development of laser unified TT&C system and laser inter satellite link equipment.