Doppler Lidar (DL) Handbook

Newsom, RK

Pacific Northwest National Laboratory (U.S.)

关键词: Spectra;    Manuals;    Remote Sensing;    99 General And Miscellaneous//Mathematics, Computing, And Information Science;    Computers;   

DOI  :  10.2172/1034640
RP-ID  :  DOE/SC-ARM/TR-101
RP-ID  :  DE-AC05-7601830
RP-ID  :  1034640

美国|英语

来源: UNT Digital Library

【 摘 要 】

The Doppler lidar (DL) is an active remote sensing instrument that provides range- and time-resolved measurements of radial velocity and attenuated backscatter. The principle of operation is similar to radar in that pulses of energy are transmitted into the atmosphere; the energy scattered back to the transceiver is collected and measured as a time-resolved signal. From the time delay between each outgoing transmitted pulse and the backscattered signal, the distance to the scatterer is inferred. The radial or line-of-sight velocity of the scatterers is determined from the Doppler frequency shift of the backscattered radiation. The DL uses a heterodyne detection technique in which the return signal is mixed with a reference laser beam (i.e., local oscillator) of known frequency. An onboard signal processing computer then determines the Doppler frequency shift from the spectra of the heterodyne signal. The energy content of the Doppler spectra can also be used to determine attenuated backscatter.