Range Resolved Laser Doppler Velocimetry Using a cw Laser Source and Pseudo Random Code Modulation for Range Resolution

本文将研究一种利用连续波源的激光多普勒测速新技术。使用连续波激光而不是传统的脉冲激光，将会产生一种轻便、紧凑、坚固和更可靠的LDV系统，适用于航天器和飞机。此外，使用多个连续波波束和互补的伪随机码可以在不扫描波束的情况下测量矢量风。潜在的应用包括全球大气风遥感、风切变和湍流探测以及初级空气仪器。为了获得距离分辨风和获得所需的信噪比，将采用激光的伪随机、二相调制和一种新的探测方案。这项工作主要是实验性的，目的是证明这种新的创新方法的可行性。将建立一个实验系统，并通过在大气中进行距离分辨风测量来进行评估。

An innovative new technique for laser doppler velocimetry will be investigated that uses a continuous wave (cw) source. The use of a cw rather than the conventional pulsed laser should result in a light, compact, rugged and more reliable LDV system suitable for use in both spacecraft and aircraft. In addition, the use of multiple cw beams and complimentary pseudo random codes should allow the vector wind to be measured without scanning the beams. Potential applications are global remote sensing of atmospheric winds, wind shear and turbulence detection and primary air instrumentation. In order to obtain range resolved wind and develop the required signal to noise ratio, pseudo random, diphase modulation of the laser and a novel detection scheme will be used. The work is primarily experimental with the goal of demonstrating feasibility of this new, innovative method. An experimental system will be built and evaluated by making range resolved wind measurements in the atmosphere.