Communications: directive radio wave systems and devices (e.g. – Directive – Beacon or receiver
Patent
1993-08-24
1996-01-09
Tarcza, Thomas H.
Communications: directive radio wave systems and devices (e.g.,
Directive
Beacon or receiver
342411, 342413, 364429, G01S 116
Patent
active
054832454
ABSTRACT:
The invention relates to an instrument landing system (ILS) signal analysis device including an analog/digital converter receiving the composite signal to be analyzed and delivering a succession of values which can be processed in digital form, the signal to be analyzed being furthermore applied to a phase-locking unit which delivers for the analog/digital converter a sampling signal of frequency greater than the largest frequency of the components of the signal to be analyzed, the digital processing of the values from the converter, carried out in real time between two sampling instants, allowing determination of the parameters for modulation of the ILS signal.
The phase-lock loop is synchronized with the frequency of the signal to be analyzed, which frequency is extracted from a sub-harmonic of the 90 Hz and the 150 Hz components constituting this signal.
REFERENCES:
patent: 4301455 (1981-11-01), Yetter
patent: 4414632 (1983-11-01), Murrell
patent: 4415899 (1983-11-01), Vogel et al.
patent: 4586049 (1986-04-01), Davidson
patent: 4609921 (1986-09-01), Flynn
patent: 4728957 (1988-03-01), Hethuin
Kollmorgen Artus
Phan Dao L.
Tarcza Thomas H.
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