Telecommunications – Receiver or analog modulated signal frequency converter – Local control of receiver operation
Patent
1981-11-05
1984-10-23
Bookbinder, Marc E.
Telecommunications
Receiver or analog modulated signal frequency converter
Local control of receiver operation
455226, H04B 116, H04B 1700
Patent
active
044792557
ABSTRACT:
An apparatus for acquiring and collecting messages aboard a satellite which are transmitted via respective radio-signals over different frequencies from a plurality of beacons comprises a receiver having an adjustable gain control input. An automatic gain control loop is provided for maintaining the gain of the receiver at a constant value. While the input frequencies of each input signals and time of arrival thereof are not exactly known, it is known that all these input frequencies are contained within a predetermined input frequency band which is periodically scanned by a frequency analyzer. This analyzer operates by scanning the center frequency of a band pass filter over the input frequency band and detecting the level of signals at the output of this filter for a plurality of successive frequencies within this input frequency band. The detected levels are digitized. The resulting digitized level indications are statistically analyzed and the result of this statistical analysis is used for adjusting the level of the gain control input of the receiver. According to an embodiment, only those detected levels which correspond substantially to input signals carrying messages retained for demodulation are used for determining an average level indication over a time period such as that for a full revolution of the satellite. The thus determined average level is compared with a reference value to adjust the receiver gain, thus eliminating gain variations due, for example, to aging of the components.
REFERENCES:
patent: 3042800 (1962-07-01), Gluth
patent: 4225976 (1980-09-01), Osborne et al.
"Decision Directed Automatic Gain Control"-NASA'S Jet Propulsion Laboratory Spring 1979, NASA Tech. Briefs, p. 10.
Geesen Michel
Ludwig Daniel P.
Mourant Jacques
Bookbinder Marc E.
Centre National d'Etudes Spatiales
Electronique Marcel Dassault
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