Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1980-04-17
1983-09-06
Tubbesing, T. H.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343 8, G01S 1360
Patent
active
044032200
ABSTRACT:
A radar system is disclosed adapted to detect relative headings between a system-equipped craft such as aircraft and ships at sea and a detected object moving relative to the ground, the system being particularly adapted to collision avoidance application. The system includes forward and rearward radar transmitter antennas, which are carried by each equipped vehicle. Each of the radar antennas is oscillated in synchronism with the other through a 180.degree. sweep, the forward radar set transmitting a scan spectrum of directional pulses of rf radiation at incremental headings through the sweep. A narrow band pass receiver detects return or echo signals in a very narrow frequency band corresponding to doppler shifted transmission frequencies. The rear radar transmits at a constant frequency and the return signal is utilized to generate a differential frequency which is the end result of a given ground speed and antenna heading. The spectrum scan of the forward transmitter is shifted in accordance with the differential frequency in order to avoid transmitting at ground echo frequency, as well as to narrow the scanning spectrum frequency to provide a highly efficient time and energy utilization in the radar scan.
REFERENCES:
patent: 2859433 (1958-11-01), Saxton et al.
Benefiel John R.
Tubbesing T. H.
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