System and method for detecting chemical species from a remote sensing platform
First Claim
1. A remote sensing system comprising:
- a transmitter that transmits an online signal and first and second offline signals toward a target,a receiver that receives a returned online signal and first and second returned offline signals from the target,a processor configured to determine (a) a first CPL (concentration path length) value based on the returned online signal and only the first offline signal, and (b) a second CPL value based on the returned online signal and only the second offline signal, andthe processor configured to determine a first CPL mean and a first CPL standard deviation, based on a predetermined number of first CPL values,the processor configured to determine a second CPL mean and a second CPL standard deviation, based on a predetermined number of second CPL values,a filter that correlates the first CPL value and the second CPL value with (a) the first CPL mean and the first CPL standard deviation and (b) the second CPL mean and the second CPL standard deviation, respectively, for determining whether the first and second CPL values are useable.
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Accused Products
Abstract
A remote sensing system includes a transmitter for transmitting an online signal and first and second offline signals toward a target. A receiver receives a returned online signal and first and second returned offline signals from the target. A processor is provided for determining (a) a first ratio based on the returned online signal and first offline signal, and (b) a second ratio based on the returned online signal and second offline signal. A filter is also provided for correlating the first ratio with the second ratio for determining whether the returned online, first offline and/or second offline signals are useable. The returned online, first offline and second offline signals are used to compute first and second concentration path lengths (CPLs) of a column of air between a target and the remote sensing platform.
43 Citations
13 Claims
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1. A remote sensing system comprising:
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a transmitter that transmits an online signal and first and second offline signals toward a target, a receiver that receives a returned online signal and first and second returned offline signals from the target, a processor configured to determine (a) a first CPL (concentration path length) value based on the returned online signal and only the first offline signal, and (b) a second CPL value based on the returned online signal and only the second offline signal, and the processor configured to determine a first CPL mean and a first CPL standard deviation, based on a predetermined number of first CPL values, the processor configured to determine a second CPL mean and a second CPL standard deviation, based on a predetermined number of second CPL values, a filter that correlates the first CPL value and the second CPL value with (a) the first CPL mean and the first CPL standard deviation and (b) the second CPL mean and the second CPL standard deviation, respectively, for determining whether the first and second CPL values are useable. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A remote sensing system comprising:
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a differential absorption lidar (DIAL) system that transmits and receives optical signals to and from a target, the optical signals including (a) an online signal having an absorption wavelength of a species of gas, (b) a first offline signal having a non-absorption wavelength of the species of gas, and (c) a second offline signal having a non-absorption wavelength of the species of gas, the DIAL system determining a first concentration path length (CPL) value based on signals (a) and only (b), and determining a second CPL value based on signals (a) and only (c), and the processor configured to determine a first CPL mean and a first CPL standard deviation, based on a predetermined number of first CPL values, the processor configured to determine a second CPL mean and a second CPL standard deviation, based on a predetermined number of second CPL values, a filter that correlates the first CPL value and the second CPL value with (a) the first CPL mean and the first CPL standard deviation and (b) the second CPL mean and the second CPL standard deviation, respectively, in order to assess quality of the optical signals. - View Dependent Claims (10, 11, 12, 13)
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Specification