Radio direction-finding using time of arrival measurements

Details Radio direction-finding using time of arrival measurements Radio direction-finding using time of arrival measurements

1987-06-09

1989-01-10

Blum, Theodore M.

Communications: directive radio wave systems and devices (e.g.,

Directive

Beacon or receiver

342394, G01S 124

Patent

active

047976799

ABSTRACT:
A method and a system for radio direction-finding by measuring the Time of Arrival (ToA) of the leading edge of signals from a distant source at two relatively closely spaced receiving elements. In order to give a good degree of immunity to multipath, the times at which the instantaneous detected amplitudes of the received signals first exceed a minimal threshold value such that received signals can be satisfactorily distinguished from noise is measured in such a manner that the measured time is not affected by multipath which involves more than a few meters additional path length for the indirect, delayed signal. A suitable timing circuit is disclosed.
By making ToA measurements on three coplanar, non-collinear receivers, directions of incidence in three dimensions can be determined.

REFERENCES:
patent: 3936831 (1976-02-01), Jones
patent: 4136342 (1979-01-01), Alcock et al.
patent: 4170774 (1979-10-01), Schaefer
patent: 4466067 (1984-08-01), Fontana
patent: 4638320 (1987-01-01), Eggert et al.

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