【正文】
美國 MIT林肯實(shí)驗(yàn)室的路基 “ 火池 ” ( Firepond)單脈沖 CO2相干激光多普勒雷達(dá),發(fā)射峰值功率為 15kW,平均功率為 ,重復(fù)頻率為 10kHZ,激光中心頻率為 3 1013Hz,探測器為 Ge摻 Cu。對 1100km遠(yuǎn)處的 GEDIII衛(wèi)星進(jìn)行了初始段的跟蹤,得到了 1urad的跟蹤精度,跟蹤系統(tǒng)帶寬 1Hz,上世紀(jì) 90年代做了改進(jìn),實(shí)現(xiàn)距離多普勒成像。 53 Firepond “火池 ” 遠(yuǎn)程 CO2成像激光雷達(dá)原理圖 54 ORACLE: Ozone Research with Advanced Cooperative Lidar Experiments NASA Canadian Space Agency Ti:sapphire and Nd:YLF。 480 mJ, efficiency 2%. 55 激光雷達(dá)國內(nèi)外研究現(xiàn)狀 Ti:sapphire laser, Nd:YAG pump, 815nm ,5 Hz on/off Δλ= ,LD injection seeding , 56 直升機(jī)防撞激光雷達(dá)國內(nèi)研究情況 ? 電子 27所研制 ? 飛行安全保障能力 90%; ? 晝夜不良天氣工作能力; ? 障礙物可視提示; ? 毋須專配操作員; ? 激光束對人眼安全; ? 告警距離 400m;分辨 15m; ? DPLOPO 57 1999 Congressional Report Appendix A Dual Use Science and Technology Projects from Fiscal Year 1998 AIR FORCE Title: Multidiscriminant/Multifunctional ElectroOptical Sensors Total Project Cost: $1,001,859。 NonFederal Contribution: $501,859。 Date of Award: 9/24/1998。 Expected Completion Date: 3/30/2022 NonFederal Participants: Coherent Technologies, Lafayette, CO Project Description: This project will fabricate test, and demonstrate an eyesafe, multifunction coherent laser radar (ladar). The transceiver will support long pulse operations for wind field estimation, short pulse operation for hard target precision range and Doppler, and short doubletpulse (polypulse) operation for hardtarget vibration measurements. 58 ? Expected Military Application(s): This is a multifunction technology with broad military application. Expected military applications include: wind profiling for precision air drop and bomb drop, ground based wake vortex detection for increased flight safety, precision target range, Doppler and microDoppler target vibration signature estimation for long range target identification and targeting, airborne wake vortex measurement for air safety and precision delivery, terrain profiling, and target designation potential. 59 ? Expected Commercial Application(s): There are both mercial air and industrial/structural diagnostics applications. Expected mercial applications include: clear air turbulence detection for mercial flight safety, vertical wind profiling supporting flight safety and enhanced flight path fuel economy, groundbased wake vortex detection to assess runway hazards at high volume mercial airports, routine Pacific flight wind field estimation for CONUS weather prediction, helicopter landing area safety assessment, and remote vibration sensing for building/structural analysis.