Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1982-03-23
1984-12-18
Blum, Theodore M.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343433, G01S 504
Patent
active
044893272
ABSTRACT:
A direction finding system has two antennas with response patterns at 90.degree.. A sense antenna 14 is mounted to produce a sense output dependent on the received radio signal but independent of its bearing. A commutating and combining arrangement receives the antenna outputs and produces a sequence of control signals each of which represents a respective one of the following: the North-South output, the East-West output, the sum of the NS and EW outputs, the difference between the NS and EW outputs, the sum of the NS and sense outputs, and the sum of the EW and sense outputs. A receiver produces an output having a magnitude dependent on any amplitude modulation on the received radio signal but independent of its bearing. A data processing unit (a) compares particular pairs of the control signals which are not dependent on the sense antenna output to produce a bearing output dependent on the bearing of the received radio signal but independent of its sense, (b) compares the values of specific pairs of the control signals, one of each such pair being a control signal not dependent on the sense antenna output and the other being a control signal dependent on the sense antenna output, to determine the sense of the bearing, and represented by the said bearing outputs, and (c) uses the output of the receiver to render the values of the control signals independent of any amplitude modulation.
REFERENCES:
patent: 3728730 (1973-04-01), Takao et al.
patent: 3754265 (1973-08-01), Markowitz
patent: 4307402 (1981-12-01), Watanabe
Blum Theodore M.
Racal Communications Equipment Limited
Sotomayor John B.
LandOfFree
Direction finding does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Direction finding, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Direction finding will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1990888