title: Note: A sub-sampling technique for frequency locking in Doppler wind lidar.
abstract: Double-edge technique is employed in Doppler wind lidar for detecting the Doppler frequency shift. A dedicated locking channel, employing one channel of a triple Fabry-Perot etalon, is designed to compensate for the effects caused by the frequency drift of outgoing laser. Agilent Oscilloscopes, with a sampling rate of 2.5 GSPS, are employed to obtain accurate amplitudes of the narrow pulses in existing experiments. In order to achieve the requirement of real-time ability and integration, a sub-sampling technique based on the theory of statistics is presented. With the technique, the drift can be acquired at a sub-sampling rate, 250 MSPS. A prototype is designed and the test results show that the prototype, providing real-time ability and better integration, has a comparable performance as the oscilloscope for frequency locking.
authors.affiliation: State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei, Anhui 230026, China.
authors.forename: Yuan
authors.initials: Y
authors.lastname: Yao
authors.affiliation: State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei, Anhui 230026, China.
authors.forename: Feng
authors.initials: F
authors.lastname: Li
authors.affiliation: State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei, Anhui 230026, China.
authors.forename: Lian
authors.initials: L
authors.lastname: Chen
authors.affiliation: State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei, Anhui 230026, China.
authors.forename: Ge
authors.initials: G
authors.lastname: Jin