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US 4,057,801 AGranted
Continuous-wave ranging system
AssigneeSperry Rand Corporation
InventorsJames Eugene Holladay, Jr., Billie Mike Spencer
Life of this patent
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Abstract
A ranging system utilizing continuous-wave radio frequencies having unique relationships which occur at a predictable rate. A radio transmission system used for transmitting data has a portion of its baseband used to determine range to a target. Three frequencies within the portion of the baseband are so chosen that there is a periodic phase conicidence of the three frequencies which occurs at predetermined intervals. The phase coincidence is detected on transmission to and from a target to provide range information.
Claims10
A continuous wave-ranging system, comprising in combination;
- a first station including first means for providing three sinusoidal signals which coincide in phase repetitively at equal intervals,
- said first station including second means for transmitting and third means for receiving said signals,
- a second station disposed at an unknown distance from said first station,
- said second station including fourth means for receiving and transmitting said signal back to said first station,
- said first station including fifth means responsive to said second means and said third means for detecting phase coincidences of said signals and for measuring the time between said phase coincidences of said signals during transmission to and reception from said second station.
2 more elements
Dependencies are inferred from the claim text.