Patent ID: 7450062
Filing Date: 2008-11-11
Classification: G01S

Abstract:
1. An integrated satellite navigation receiver and communication device combination system, comprising: a single portable device that includes a global positioning system (GPS) receiver part and a communications transceiver part; said GPS receiver part including a GPS RF-receiver, a GPS digital processor and frequency generator (GPS-chip), a GPS oscillator (oscGPS), a lower-frequency oscillator (osc said communications transceiver part including a cellphone transceiver, a digital signal processor (DSP), a phone host CPU, a divider, and a voltage controlled oscillator (VCO); wherein, at turn-on, the GPS-chip loads a default startup processor clock synthesis-frequency value for said phone CPU, and a host processor clock frequency is generated by multiplying a GPS clock that is input to a numeric controlled oscillator (NCO) that can then be digitally programmed to generate a requested output frequency; and wherein, if the GPS receiver part is tracking GPS satellites and solving for frequency error, it compensates a requested frequency by computing the error in said GPS oscillator (oscGPS) to provide a more stable frequency to said VCO.