Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite
Patent
1995-08-25
1997-01-07
Tarcza, Thomas H.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a satellite
455 121, 342352, G01S 502
Patent
active
055921752
ABSTRACT:
In a communication system (10) having at least one communication unit (26) (CU) and at least one satellite (12, 170) which projects communication cells (176, 180) toward the CU (26), a method for determining a CU's location involves identifying (202) optimal communication cells (180) in which an intersection (112) between a time delay contour (106) and a Doppler contour (103) falls below an acceptable level, informing (206) the CU (26) to contact a location determination unit (330) when the CU (26) is within an optimal communication cell (180), and determining (212) the CU position at that time. Additionally, the method can achieve a better approximation of the CU position by calculating (244) a CU position relative to a second CU, and/or by using (282-290) a direction-finding unit to more accurately locate the CU (26).
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Motorola Inc.
Phan Dao L.
Tarcza Thomas H.
Whitney Sherry J.
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