Patent ID: 7701388

Claim:
A receiver for receiving wireless signals from transmitters to calculate location information, comprising: a first tuner for converting a global positioning system (GPS) signal from an original frequency to a first intermediate frequency (IF), the GPS signal having a signal strength; a second tuner for converting a digital broadcasting system (DBS) signal to a second intermediate frequency (IF), the DBS signal having a signal strength; a signal detecting unit for detecting the presence of the GPS signal and the DBS signal, measuring the signal strength of detected signals and outputting a signal indicating a positioning mode based on a ratio between measured signal strength; a hybrid signal processing unit in communication with the first tuner, the second tuner, and the signal detecting unit, the hybrid signal processing unit capable of operating in standalone GPS mode, standalone DBS mode, or assisted mode according to the positioning mode and determining positions of the transmitters and an arrival time difference between each detected signal received at the receiver; and a measurement data processing unit coupled to the hybrid signal processing unit for determining the location information of the receiver based on the positions of the transmitters and the arrival time difference.