公开(公告)号：US09097646B1

公开(公告)日：2015-08-04

申请号：US14072019

申请日：2013-11-05

申请人： The United States of America as represented by the Administrator of the National Aeronautics and Space Administration

发明人： Joel F. Campbell ,  Bing Lin ,  Amin R. Nehrir

IPC分类号： G01C3/08 ,  G01N21/17

CPC分类号： G01N21/17 ,  G01S7/4802 ,  G01S17/325 ,  G01S17/95 ,  Y02A90/19

摘要： A continuous wave Light Detection and Ranging (CW LiDAR) system utilizes two or more laser frequencies and time or range shifted pseudorandom noise (PN) codes to discriminate between the laser frequencies. The performance of these codes can be improved by subtracting out the bias before processing. The CW LiDAR system may be mounted to an artificial satellite orbiting the earth, and the relative strength of the return signal for each frequency can be utilized to determine the concentration of selected gases or other substances in the atmosphere.

摘要翻译： 连续波光检测和测距（CW LiDAR）系统利用两个或多个激光频率和时间或距离移位伪随机噪声（PN）码来区分激光频率。 这些代码的性能可以通过在处理之前减去偏差来提高。 CW LiDAR系统可以安装到绕地球运行的人造卫星，并且可以利用每个频率的返回信号的相对强度来确定大气中选定气体或其他物质的浓度。

公开(公告)号：US10254405B2

公开(公告)日：2019-04-09

申请号：US14817805

申请日：2015-08-04

申请人： The United States of America as represented by the Administrator of the National Aeronautics and Space Administration

发明人： Joel F. Campbell ,  Bing Lin ,  Amin R. Nehrir

IPC分类号： G01S7/35 ,  G01S17/32 ,  G01S7/486 ,  G01S7/491 ,  G01S7/534

摘要： Systems, methods, and devices may enhance the apparent sample rate of data collected using Nyquist sampling from a system, such as Continuous Wave (CW) Light detection and ranging (“Lidar”), Radio detection and ranging (“Radar”), or Sound Navigation and Ranging (“Sonar”), that has been modulated with a repeating waveform, such as linear swept frequency, by reordering of the data in the frequency domain. The enhancement of the apparent sample rate may result in a highly interpolated range profile where the data resolution may be enhanced by a factor equal to the number of repeats in the signal being processed, and may result in a highly detained range measurement with a high precision. The various embodiments may combine data from multiple modulation repeats into a single highly interpolated pulse, which may result in a real-time finer range measurement from CW Lidar, Radar, or Sonar systems.