Time reference scanning beam microwave landing system

Details Time reference scanning beam microwave landing system Time reference scanning beam microwave landing system

1982-03-15

1984-12-18

Blum, Theodore M.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343378, G01S 116

Patent

active

044893264

ABSTRACT:
The disclosure teaches a method, and an apparatus for carrying out the method, for determining the time between TO and FRO received waveforms from the time reference scanning beam (TRSB) of a microwave landing system (MLS). In accordance with the invention, the time interval between the TO and FRO received waveforms is determined by correlating the received waveforms with apriori waveforms representative of the TO and FRO waveforms respectively. The apriori waveforms are generated by having a process construct matched filters for these waveforms. A FRO received waveform is used to provide an apriori representation of a TO received waveform and vice-versa. In one embodiment of the invention, the TO and FRO waveforms which are used to construct the matched filters are time reversed.

REFERENCES:
patent: 3495077 (1970-02-01), Hiltz et al.
patent: 3906213 (1975-09-01), Meriaux et al.
patent: 4017862 (1977-04-01), Wild
patent: 4019184 (1977-04-01), Dorey
patent: 4025775 (1977-05-01), Beauvais et al.
patent: 4169245 (1979-09-01), Crom et al.
patent: 4306238 (1981-12-01), Enein
patent: 4306239 (1981-12-01), Enein
patent: 4333081 (1982-06-01), Hofgen
"Time Reference Microwave Landing System Multipath Control Techniques", by R. J. Kelly, Journal of the Institute of Navigation, vol. 23, No. 1.
"Comparison Study of MLS Airborne Signal Processing Techniques", by R. J. Kelly and E. F. C. La Berge, 1978, I.E.E.E. document 78CH1336-7 NAECON.

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