GPS WITH AIDING FROM AD-HOC PEER-TO-PEER BLUETOOTH NETWORKS

摘要

The present invention is related to location positioning systems, and more particularly, to a method and apparatus for providing an update of ephemeris information. According to one aspect, GPS enabled devices in the signal unavailable area monitors the state of its ephemeris data and time information. When the ephemeris data and time information become out of date, the GPS enable device uses an ad hoc Bluetooth network to retrieve ephemeris data and time information from another GPS enabled device with more current data. According to further aspects, a map of a deep hole region in which GPS and other cellular signals are not available, is generated to enable power reduction and cost saving measures.

主权项

1. A method for generating a deep hole map comprising:
detecting a signal strength of at least one mobile Global Positioning System (GPS) device; comparing the detected signal strength of the at least one mobile GPS device to a predetermined signal strength threshold value; determining a last known position for the at least one mobile GPS device when the signal strength of at least one mobile GPS device is below the predetermined signal strength threshold value; determining a first fix position for the at least one mobile GPS device when the detected signal strength returns to a value above the predetermined threshold value; and transmitting the last known position and the first fix position to a crowd-sourcing server for use in generating the deep hole map.