Communications: directive radio wave systems and devices (e.g. – Directive – Position indicating
Patent
1984-09-28
1987-06-02
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Position indicating
342 13, G01S 1308
Patent
active
046707581
ABSTRACT:
A system and related methods for passively detecting range and/or elevation of a signal emitting target by employing an X-beam antenna system which has a fixed angle .theta. between planes of receipt and which rotates those planes of receipt at a rate of sweep .gamma.. A first correlator is employed to measure the time delay .DELTA.T.sub.1 between receipt of a signal directly from a target in the first plane of the X-beam and receipt of a signal from the target in that first plane but reflected from a remote surface. A second correlator is employed to measure the time delay .DELTA.T.sub.2 between receipt of a signal from the target in the first plane and subsequent receipt of a signal from that target in the second plane as the first and second planes rotate. Receiver altitude R.sub.H is measured by conventional means and thereafter target range and/or elevation is calculated in response to .theta., .gamma., .DELTA.T.sub.1, .DELTA.T.sub.2 and R.sub.H.
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Blum Theodore M.
Sotomayor John B.
The Boeing Company
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