Communications: directive radio wave systems and devices (e.g. – Directive – Beacon or receiver
Patent
1994-08-12
1995-03-28
Issing, Gregory C.
Communications: directive radio wave systems and devices (e.g.,
Directive
Beacon or receiver
342429, 343725, 343729, G01S 504, G01S 502, H01Q 2100
Patent
active
054021324
ABSTRACT:
A direction finding system utilizing a single monopole/crossed slot antenna in combination with associated electronic circuitry. Each of the four ports of the antenna are connected to amplitude varying elements whose outputs are combined by a power combiner. A microcontroller stores the signal. The microcontroller also generates the signals which control the amplitude variation supplied by each of the amplitude varying elements. Two configurations of the amplitude varying elements are provided by predetermined settings within the microcontroller. The two settings are selected to configure the antenna on two distinct reception patterns, each with a predetermined angular offset from a reference direction. In operation the antenna will be configured for a first reception pattern. The signals received will be detected, quantified, and stored by the microcontroller which subsequently reconfigures the antenna for a second reception pattern. A second signal is received by the antenna in the second configuration and again is detected, quantified, and stored by the microcontroller. The microcontroller determines the difference between the two signals and, based upon a predetermined calibration curve relating differences in the stored signals to the angle of arrival of the signals from the reference direction, determines the angle from which the signal arrived.
REFERENCES:
patent: 2286839 (1942-06-01), Schelkunoff
patent: 3725937 (1973-04-01), Schreiber
patent: 4062015 (1977-12-01), Litva et al.
patent: 4443802 (1984-04-01), Mayes
patent: 4587524 (1986-05-01), Hall
patent: 4684953 (1987-08-01), Hall
Itoh et al, "A Novel Slots--and Monopole Antenna With A Steerable Cardioid Pattern", IEEE Trans. on Aerospace & Electronic System, vol. AES-8 No. 2 (Mar. 1972).
Hall Edward A.
Schmitt Gilbert J.
Issing Gregory C.
McDonnell Douglas Corporation
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