Atmospheric characterization systems and methods
US-11879981-B2 · Jan 23, 2024 · US
Colored noise reduction method and device for optical remote airflow measurement apparatus
US9019481B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9019481-B2 |
| Application number | US-201213644573-A |
| Country | US |
| Kind code | B2 |
| Filing date | Oct 4, 2012 |
| Priority date | Oct 6, 2011 |
| Publication date | Apr 28, 2015 |
| Grant date | Apr 28, 2015 |
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Abstract
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An object of the present invention is to provide an optical remote airflow measurement apparatus with which even colored noise corresponding to an external environment of the apparatus can be reduced, thereby reducing measurement reliability deterioration and enabling long-distance measurement in a wide flying speed range. A colored noise reduction method according to the present invention includes: considering a signal strength of scattered light to be substantially non-existent in a remotest region and beyond; calculating a noise distribution by performing processing to average the signal strength in respective Doppler frequency components divided at intervals of a certain frequency in the remotest measurement region and beyond, and performing subtraction processing in each of the Doppler frequency components on all signal strength distributions of the measurement region, which are obtained by dividing the noise distribution at intervals of a certain distance.
First claim
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What is claimed is: 1. A colored noise reduction method for an optical remote airflow measurement apparatus that emits laser light into the atmosphere as a transmission signal, receives scattered laser light generated from said laser light by aerosols in the atmosphere as a reception signal, and measures a wind speed of an airflow in a remote region on the basis of a Doppler shift amount of a frequency between said transmission signal and said reception signal, said method comprisi…
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- G01S17/95Primary
Physics · mapped topic
Physics · mapped topic
Physics · mapped topic
Cross-Sectional Technologies · mapped topic
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- What does patent US9019481B2 cover?
- An object of the present invention is to provide an optical remote airflow measurement apparatus with which even colored noise corresponding to an external environment of the apparatus can be reduced, thereby reducing measurement reliability deterioration and enabling long-distance measurement in a wide flying speed range. A colored noise reduction method according to the present invention incl…
- Who is the assignee on this patent?
- Japan Aerospace Exploration
- What technology area does this patent fall under?
- Primary CPC classification G01S17/95. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Apr 28 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).