Communications: directive radio wave systems and devices (e.g. – Directive – Beacon or receiver
Patent
1997-08-29
1999-11-23
Issing, Gregory C.
Communications: directive radio wave systems and devices (e.g.,
Directive
Beacon or receiver
342195, 342445, G01S 352, G01S 1300
Patent
active
059908343
ABSTRACT:
An apparatus and method for target-angle determination using lower-frequency radars having compact non-moving antennas over broad viewing sectors. Use of direction finding (DF) in place of beam forming and scanning eliminates the need for conventional, physically large phased-array antenna systems. The described DF algorithm advances the art over previously described least-squares DF by allowing numerically efficient and robust resolution of multiple targets at closely spaced angles. When used with coastal HF ocean surface current and wave monitoring radars where sea echo is the target, the method extracts complex current patterns. The high degree of singularity of the antenna signal covariance matrix is exploited and used as the basis for extracting angles with minimal averaging. More receive antenna elements can be added at convenient locations to handle more complex target angle scenarios.
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Barrick Donald E.
Lipa Belinda J.
Codar Ocean Sensors, Ltd.
Issing Gregory C.
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