Pulse or digital communications – Receivers – Angle modulation
Patent
1996-02-01
1998-10-27
Chin, Stephen
Pulse or digital communications
Receivers
Angle modulation
375326, 375354, 375355, 375324, 375316, 375322, H04L 2714, H04L 2716, H04L 2722
Patent
active
058287051
ABSTRACT:
The carrier tracking loop technique and apparatus provides smooth, accurate frequency tracking, fast reacquisition and doppler tracking over a wide dynamic range. The loop parameters of the carrier tracking loop are varied as a function of mode, i.e. flywheel, tracking or reacquisition modes. The various modes of operation are automatically detected and loop operation is enhanced by non-linear techniques. The enhancements include fourth power sample normalization to improve performance over a large dynamic range and to ease fixed point scaling. A slope limiter is included which aids in coherent detection by reducing phase noise introduced by the carrier tracking loop. Also, a predifferentiation filter further aids in coherent detection by reducing phase noise.
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patent: 5566214 (1996-10-01), Kroeger et al.
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patent: 5644606 (1997-07-01), Martinez et al.
patent: 5684842 (1997-11-01), Daffara
patent: 5696797 (1997-12-01), Bucher et al.
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Baird Jeffrey S.
Kroeger Brian W.
Chin Stephen
Lenart R. P.
Maddox Michael
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