Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1977-01-27
1978-12-12
Buczinski, S. C.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
325116, G01S 956
Patent
active
041298683
ABSTRACT:
A radar beacon apparatus to be used in conjunction with a search radar during emergency rescue operations. The radar beacon apparatus includes a receiving unit for receiving and detecting a radar pulse wave; a gate signal generating unit for generating upon the detection of a radar pulse wave a gate signal having a specific time interval; a transmitting unit for transmitting a frequency modulated signal which linearly and repetitively changes frequency over a predetermined frequency band during the time interval of the gate signal; and a display unit for displaying the reception of a radar pulse wave. The frequency sweep of the FM signal transmitted by the radar beacon completely covers and overlaps the receiver bandwidth of a comparable search radar, with each beacon transmission having an identical phase and frequency characteristic with respect to prior beacon transmissions. In an emergency situation, the beacon FM transmission produces multiple frequency incursions within the bandpass of the search radar receiver. Due to the constant phase and frequency relationship of these incursions, they are detected and integrated by the search radar to produce a bright display indicative of the position of the radar beacon apparatus. Also, in one embodiment, under normal circumstances the radar beacon operates as a search radar with the beacon transmitter muted while the beacon apparatus displays received radar pulses.
REFERENCES:
patent: 2907999 (1959-10-01), Wadley
patent: 3391404 (1968-07-01), Vogelman
patent: 3546695 (1970-12-01), Freedman
patent: 3967202 (1976-06-01), Batz
Kotoh Keigo
Tahara Kiyokazu
Buczinski S. C.
Mitsubishi Denki & Kabushiki Kaisha
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