Demodulators – Amplitude modulation demodulator – Having specific distortion – noise or other interference...
Patent
1983-09-06
1986-04-22
LaRoche, Eugene R.
Demodulators
Amplitude modulation demodulator
Having specific distortion, noise or other interference...
329110, 375 83, H03D 300
Patent
active
045845344
ABSTRACT:
The invention relates to a method for demodulating a carrier wave which is phase modulated by a subcarrier wave which is phase shift modulated by baseband signals and applies especially to data transmission between a spacecraft and a ground station. The technological problem addressed is reduction of signal degradation and, consequently, of transmission power and size of the receiving antenna. According to the invention, the frequency is first down converted to an intermediate frequency (f.sub.c) which is lower than the carrier wave frequency; the subcarrier wave is extracted by phase demodulation using a Costas loop; digital sampling is performed on the signal demodulated in a Costas loop at a frequency which is twice the intermediate frequency (f.sub.c) and the bit clock frequency (f.sub.B) is regenerated in a first order phase locked loop using the subcarrier wave frequency as a reference frequency.
REFERENCES:
patent: 3993956 (1976-11-01), Gilmore et al.
patent: 4224575 (1980-09-01), Mosley et al.
patent: 4509017 (1985-04-01), Andren et al.
Drewes Gerardus
Lijphart Enno E.
Agence Spatiale Europeenne
LaRoche Eugene R.
Pascal Robert J.
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