文档介绍：A Fiber-Optic-Based 1550-nm Laser Radar Altimeter with RF pression
Christopher Allen, Sivaprasad Gogineni
The University of Kansas, Radar Systems and Remote Sensing Laboratory
2291 Irving Hill Road, Lawrence, Kansas 66045 USA
Telephone: 785 / 864-3017 Facsimile: 785/ 864-4971 email: ******@. edu
Abstract--We are developing a laser radar (lidar) altimeter To achieve a l-c range accuracy of 10 cm, the GLAS
that mercial off-the-shelf fiber-ponents transmits 1064-nm wavelength, 15-MW peak power, 5-ns
and traditional RF and digital signal processing techniques to duration pulses at a pulse repetition frequency (PRF) of
achieve fine-range accuracy despite a low transmit peak 40 Hz for an effective average power of 3 W. High peak
power. A 1550-nm operating wavelength was selected so powers shorten laser life, and, in the case of GLAS, three
that available erbium-doped fiber amplifiers (EDFAs) could lasers are required (two to meet the lifetime requirements and
be used to provide optical gain. The transmitted signal, an the third for redundancy). Further, for each pass of the
amplified, gated CW optical carrier intensity modulated with satellite, the GLAS sensor will provide elevation samples
a linear-FM (chirp) RF signal, is launched into free-space via based on the 70-m laser footprints at a 40 Hz rate yielding an
a fiber-optic collimator. An optical teles