NDLI: Method and apparatus for measuring distance

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Method and apparatus for measuring distance

Content Provider	NASA Technical Reports Server (NTRS)
Copyright Year	1988
Description	The invention employs a continuous wave radar technique and apparatus which can be used as a distance measuring system in the presence of background clutter by utilizing small passive transponders. A first continuous electromagnetic wave signal S sub 1 at a first frequency f sub 1 is transmitted from a first location. A transponder carried by a target object positioned at a second (remote) location receives the transmitted signal, phase-coherently divides the f sub 1 frequency and its phase, and re-transmits the transmitted signal as a second continuous electromagnetic wave signal S sub 2 at a lower frequency f sub 2 which is a subharmonic of f sub 1. The re-transmitted signal is received at the first location where a measurement of the phase difference is made between the signals S sub 1 and S sub 2, such measuremnt being indicative of the distance between the first and second locations.
File Size	1270391
Page Count	13
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19880017184
Archival Resource Key	ark:/13960/t10p5zc3t
Language	English
Publisher Date	1988-07-12
Access Restriction	Open
Subject Keyword	Communications And Radar Radio Frequency Interference Continuous Wave Radar Electromagnetic Radiation Radar Targets Signal Transmission Radar Receivers Clutter Distance Measuring Equipment Antenna Radiation Patterns Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Patent

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