Mobile direction finder
First Claim
1. A mobile direction finder for tracking a transmitter remote therefrom, said direction finder comprising a receiver for receiving signals from the transmitter, direction-computing means for computing a direction of the transmitter relative to the direction finder from the received signals, time-averaging means for averaging the computed directions over signal-receiving time periods, and a reference device which establishes a datum derived from a predetermined orientation independent of the orientation of the direction finder, wherein said time averaged computed directions are made with reference to said datum.
1 Assignment
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Accused Products
Abstract
A mobile direction finder for tracking a remote transmitter computes the transmitter direction relative to the direction finder and time-averages with reference to a datum derived from a predetermined orientation independent of the direction finder orientation.
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Citations
12 Claims
- 1. A mobile direction finder for tracking a transmitter remote therefrom, said direction finder comprising a receiver for receiving signals from the transmitter, direction-computing means for computing a direction of the transmitter relative to the direction finder from the received signals, time-averaging means for averaging the computed directions over signal-receiving time periods, and a reference device which establishes a datum derived from a predetermined orientation independent of the orientation of the direction finder, wherein said time averaged computed directions are made with reference to said datum.
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9. A method for tracking a transmitter which is remote from a receiver comprising:
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a) receiving signals in a receiver of a mobile direction finder from a remote transmitter while said direction finder and said transmitter are moving relative to each other, b) computing a direction of the transmitter relative to the direction of the direction finder from the received signals, c) establishing a datum derived from a predetermined orientation independent of the orientation of the direction finder, d) averaging the computed directions over signal-receiving time periods with reference to said datum to at least reduce the effects of multipath interference without unduly adversely affecting the time of response to changes in orientation of the direction finder. - View Dependent Claims (10, 11, 12)
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Specification