Scanning beam receiver system with coherent post-detection signa

Details Scanning beam receiver system with coherent post-detection signa Scanning beam receiver system with coherent post-detection signa

1977-01-25

1978-08-15

Wilbur, Maynard R.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343108M, G01S 144

Patent

active

041076869

ABSTRACT:
A receiving system for a time-reference, scanning beam radio guidance system in which the scanning beam, an offset frequency reference signal and a time reference signal are provided from the ground beacon location. The receiving system includes a first detector responsive to the scanning beam and offset reference signals to provide a spectrum centered about the offset signal. A bandpass filter with sloping skirts on both sides of the center (offset) frequency provides tapering, with decreasing amplitude response on each side of the center frequency, the width of the spectrum being a function of the aperture of the beam transmitting antenna at the ground beacon. Angular information is determined by thresholding the beam signal to find two points on either side of beam center, averaging these times and comparing with the time-reference signal to air-derive angular navigational data, especially for aircraft landing approach systems.

REFERENCES:
patent: 3141166 (1964-07-01), Strong et al.
patent: 4053892 (1977-10-01), Earp

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