Development of a Microwave Modulated, Dual Optical Wavelength Geodetic Distance-measuring Instrument PDF Download
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Author: J. C. Owens
Publisher:
ISBN:
Category : Geodesy
Languages : en
Pages : 108
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Author: J. C. Owens
Publisher:
ISBN:
Category : Geodesy
Languages : en
Pages : 108
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Book Description
Author: J. C. Owens
Publisher:
ISBN:
Category : Geodesy
Languages : en
Pages : 118
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Book Description
The accuracy of optical distance measurements on horizontal paths is limited at present to several parts per million by uncertainty in knowledge of the average air density along the path. This report describes the development and testing of a prototype instrument capable of significant;y greater accuracy, probably as high as 0.1 ppm. The instrument makes simultaneous measurements of transit time using two superimposed beams of light which have different optical wavelengths but which are modulated at a common microwave frequency. From the difference in transit times for the two colors, plus the absolute transit for either one, the average refractive index along the path and hence the true geodetic path length can be determined. Tests over a 5.3 -km patch have given a standard error of 0.3 ppm in corrected distance, and it is believed that even better results can be obtained. The system is described in detail, including modifications that would significantly increase its accuracy and range.
Author: K. B. Earnshaw
Publisher:
ISBN:
Category : Distances
Languages : en
Pages : 132
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Author: United States. Environmental Science Services Administration
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Category :
Languages : en
Pages : 116
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Author:
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ISBN:
Category : Evaporation (Meteorology)
Languages : en
Pages : 592
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Author: United States. Department of Commerce. Office of Publications
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 68
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Author: United States. Dept. of Commerce
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 964
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Author:
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ISBN:
Category : Government publications
Languages : en
Pages :
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Author:
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ISBN:
Category : Atmosphere
Languages : en
Pages : 622
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Author: United States. Superintendent of Documents
Publisher:
ISBN:
Category : United States
Languages : en
Pages : 1504
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