GPS receiver utilizing a communication link
March 8, 2016. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesNavigation system and method Receivers for navigation satellite systems Method of doppler searching in a digital GPS receiver Digital global positioning system receiver Method and apparatus for deriving pseudo range from earth-orbiting satellites Low power digital receiver Efficient detection and signal parameter estimation with application to high dynamic GPS receiver CPS transform correlation receiver and method Exploration system and method for high-accuracy and high-confidence level relative position and velocity determinations Vehicle tracking and security system InventorAssigneeApplicationNo. 612582 filed on 03/08/1996US Classes:342/357.12, GPS receiver signal processing701/213, Using Global Positioning System (GPS)701/214Means to improve accuracy of position or locationExaminersPrimary: Blum, Theodore M.Attorney, Agent or FirmForeign Patent References
International ClassesH04B 007/185G01S 005/02 AbstractA GPS receiver in one embodiment includes an antenna which receives GPS signals at an RF frequency from in view satellites; a downconverter coupled to the antenna for reducing the RF frequency of the received GPS signals to an intermediate frequency (IF); a digitizer coupled to the downconverter and sampling the IF GPS signals at a predetermined rate to produce sampled IF GPS signals; a memory coupled to the digitizer storing the sampled IF GPS signals (a snapshot of GPS signals); and a digital signal processor (DSP) coupled to the memory and operating under stored instructions thereby performing Fast Fourier Transform (FFT) operations on the sampled IF GPS signals to provide pseudorange information. These operations typically also include preprocessing and post processing of the GPS signals. After a snapshot of data is taken, the receiver front end is powered down. The GPS receiver in one embodiment also includes other power management features and includes, in another embodiment the capability to correct for errors in its local oscillator which is used to sample the GPS signals. The calculation speed of pseudoranges, and sensitivity of operation, is enhanced by the transmission of the Doppler frequency shifts of in view satellites to the receiver from an external source, such as a basestation in one embodiment of the invention.Other References
| |
