Communications: directive radio wave systems and devices (e.g. – With particular circuit
Patent
1996-08-02
1997-12-30
Hellner, Mark
Communications: directive radio wave systems and devices (e.g.,
With particular circuit
455 63, 455 71, G01S 1300, H04B 110
Patent
active
057035954
ABSTRACT:
A communication system includes base communication units (105, 155) facilitating a communication link with portable communication units (110) in motion relative to base communication units. The relative motion between base communication units (105, 155) and portable communication units (110) introduces Doppler frequencies into communication links (115, 165). When portable communication units (110) travel in a predictable direction (119), frequency offsets for Doppler compensation are generally predictable. However, when portable communication units (110) move erratically in relationship to a base communication unit (105, 155), frequency offsets for Doppler compensation are not easily calculated. Incorporation of velocity vector data into the frequency offset calculation for Doppler compensation provides reliable tracking and Doppler frequency compensation for erratic motion of portable communication units (110).
REFERENCES:
patent: 3715663 (1973-02-01), Laughlin et la.
patent: 3940695 (1976-02-01), Sickles, II
patent: 5095538 (1992-03-01), Dorboraw, III
patent: 5455964 (1995-10-01), Roos et al.
Frederick Robert Thomas
Miller Nathan West
Tayloe Daniel Richard
Hellner Mark
Johanson Kevin K.
Motorola Inc.
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