Pulse or digital communications – Repeaters – Testing
Patent
1990-06-15
1992-03-03
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
375 97, 36471511, 36472806, H03K 5159
Patent
active
050938460
ABSTRACT:
In the signal acquisition system disclosed herein, frequency, phase and time uncertainties are resolved essentially simultaneously by including a preselected code group in the transmitted signal and by applying the received signal to a differential detector and then to a passive differential matched filter, the parameters of which are selected in correspondence with a code group, thereby to generate a corresponding series of complex match values. The absolute magnitude of the complex sum of the match values is maximized when the received signal is modulated by the preselected code group. When the presence of the code group in the received signal is detected, the phasing of the complex sum is detected thereby to determine carrier frequency offset. A directly detected version of the received signal is applied to a corresponding masking filter and the phase of a resultant sum signal is detected to determine carrier phase offset.
REFERENCES:
patent: 4161033 (1979-07-01), Martinson
patent: 4244029 (1981-01-01), Hogan et al.
patent: 4498141 (1985-02-01), Cooper
patent: 4754457 (1988-06-01), Bright et al.
Holt Anthony P.
Walton, Jr. J. Rodney
Pahl Jr. Henry D.
Safourek Benedict V.
Sundstrand Data Control Inc.
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