Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1991-01-31
1993-04-13
Eisenzopf, Reinhard J.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
4551671, 455260, 455265, 455304, 375 1, 331 4, H04B 106
Patent
active
052030300
ABSTRACT:
A satellite transmission capturing method for the GPS receiver whereby PLL operation is stopped until the demodulation intensity of a demodulator reaches a predetermined level. The frequency of the reproduced carrier of the demodulator is consecutively changed in increments of a frequency range wider than the PLL capture range in search for satellite transmissions. This allows the demodulation intensity to reach the predetermined level in fewer frequency changing steps than ever before. Thus the time required to capture the desired satellite transmission is reduced. Where the integral time constant of a low pass filter in the demodulator is set to a value smaller than that in effect during PLL operation until the demodulation intensity of the demodulator reaches the predetermined level, a wide band demodulation intensity curve is used in search for satellite transmissions until that level is exceeded. This further widens the frequency range in which to search satellite transmissions, and the time required to capture the desired satellite transmission is further shortened accordingly.
REFERENCES:
patent: 2896169 (1959-07-01), Howell
patent: 3626426 (1971-12-01), Steinberg
patent: 3777276 (1973-12-01), Klein
patent: 4336616 (1982-06-01), Carson et al.
patent: 4374437 (1983-02-01), Citta et al.
patent: 4476580 (1984-10-01), Tanaka et al.
patent: 4498191 (1985-02-01), Rogers
Eisenzopf Reinhard J.
Faile Andrew
Pioneer Electronic Corporation
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