DOI: 10.3724/SP.J.1010.2013.00508

Journal of Infrared and Millimeter Waves (红外与毫米波学报) 2013/32:6 PP.508-513

Laser Doppler radar for landing navigation

Precise determination of the relative velocity between the spacecraft and celestial body is necessary to ensure the secure landing in space exploration.An all-fiber linear frequency modulation continuous wave(LFMCW)-continuous wave(CW) Doppler laser radar was developed for landing navigation.A narrow line width laser was used as the seed laser.The laser frequency was modulated by an acousto-optic modulator.Speed vector was measured in real-time by means of balance coherent detection and digital signal processing based on FPGA.Experiments made on laser Doppler radar with a speed generator proved that 0.05cm/s or better accuracy can be achieved while the velocity direction can be discriminated.

Key words:laser Doppler,landing navigation,linear frequency modulation continuous wave (LFMCW),direction discrimination,laser radar

ReleaseDate:2015-05-04 09:28:15

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