Communications – electrical: acoustic wave systems and devices – Echo systems – Distance or direction finding
Patent
1996-03-28
2000-08-15
Lobo, Ian J.
Communications, electrical: acoustic wave systems and devices
Echo systems
Distance or direction finding
367124, 367127, G01S 1550, G01S 1500
Patent
active
06104671&
ABSTRACT:
An apparatus and method for measuring the true distance and relative velocity between first and second objects. The apparatus comprises a transceiver located at the first object which measures a first transit time for the transmission of a first signal from a first object to a second object and for the reflection of the first signal from the second object back to the first object. The transceiver further measures a second transit time for the transmission and reflection of a second signal, the second signal being transmitted immediately upon the reflection of the first signal back to the first object. First and second transit times can be used to calculate first and second apparent distances between the first and second objects, respectively. The apparatus also includes calculating means for determining the relative velocity between the first and second objects using the first transit time and the second transit time. The calculating means calculates the true distance between the first and second objects at the time of reflection of the second signal by modifying the second apparent distance in accordance with the relative velocity between the first and second objects during the time of transmission and reflection of the second signal.
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Hoyt Reed W.
Lanza John F.
Arwine Elizabeth
Harris Charles H.
Hoyt Reed W.
Lanza John F.
Lobo Ian J.
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