| US 7,580,794 B2 | ||
| Remote subscription unit for GNSS information | ||
| James M. Janky, Los Altos, Calif. (US); David G. Bird, Thornton, Colo. (US); and Ann Ciganer, San Mateo, Calif. (US) | ||
| Assigned to Trimble Navigation Limited, Sunnyvale, Calif. (US) | ||
| Filed on Jun. 26, 2006, as Appl. No. 11/474,691. | ||
| Application 11/474691 is a continuation of application No. 11/328364, filed on Jan. 09, 2006, granted, now 7,089,113, filed on Aug. 08, 2006. | ||
| Application 11/328364 is a continuation of application No. 10/744925, filed on Dec. 23, 2003, granted, now 7,020,555. | ||
| Prior Publication US 2007/0055445 A1, Mar. 08, 2007 | ||
| Int. Cl. G10K 15/02 (2006.01); G06F 19/00 (2006.01) | ||
| U.S. Cl. 701—213 [701/214; 342/357.12; 380/277] | 30 Claims |
| 1. A global navigation satellite system (GNSS) subscription unit, comprising:
receiver circuitry for receiving a GNSS aiding signal from a GNSS information server, said GNSS aiding signal having a plurality
of items encrypted with a plurality of subscription keys;
a subscription key generator for providing certain ones of said subscription keys corresponding to certain ones of said items
for which the unit has subscriptions;
a GNSS information decrypter for decrypting said certain items with said certain subscription keys; and
a GNSS receiver for using said decrypted items for processing a GNSS satellite signal, wherein:
said items in said GNSS aiding signal include at least one of GNSS correction information for improving accuracy of a GNSS
position computed by the GNSS receiver, GNSS acquisition information for improving sensitivity in the GNSS receiver to said
GNSS satellite signal or GNSS acquisition information for improving speed for acquiring said GNSS satellite signal in the
GNSS receiver.
|