Large field of view beaconless laser nutation tracking sensor based on a micro-electro-mechanical system mirror.

We propose a laser nutation tracking sensor for beaconless laser communication, which uses a micro-electro-mechanical system (MEMS) mirror to achieve high-efficiency and large-amplitude nutation at its resonant frequency. We derive a new formula for the case of incompletely detectable optical power in the nutation cycle. In the experiment, we measure the performance of the sensor in calculating boresight error under three different nutation radii.

Phase-shift laser range finder technique based on optical carrier phase modulation.

A coherent laser range finder based on optical phase modulation and phase shift measurement is presented. In the proposed laser range finder, the emitted laser is modulated by an electro-optic phase modulator using a 20 MHz sine signal, and the received laser is mixed with a local oscillator using a 90° optical hybrid. Compared with traditional laser phase shift range finders, the proposed laser range finder can measure the velocity and range at high precision simultaneously.

Two-one-way laser Doppler approach for inter-satellite velocity measurement.

A high-precision inter-satellite velocity measurement method based on two-one-way laser Doppler is presented in this paper. This method's working principle and signal-to-noise ratio's effect under different measurement times of signal on velocity precision are analyzed theoretically. This method is also tested by laboratory experiments and 1 mm/s velocity precision is achieved in 1 ms integrating time.