Pre-acquisition frequency offset removal in a GPS receiver
June 26, 2017. 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 ReferencesPrecorrelation digital spread spectrum receiver Low power digital receiver CPS transform correlation receiver and method System and method for receiving and decoding global positioning satellite signals Signal processing method for a GPS receiver Method and apparatus for tracking the position and velocity of airborne instrumentation All digital maximum likelihood based spread spectrum receiver Method and apparatus for accelerating code correlation searches in initial acquisition and doppler and code phase in re-acquisition of GPS satellite signals Very low power high accuracy time and frequency circuits in GPS based tracking units GPS receiver and method for processing GPS signals Patent #: 5884214 InventorsAssigneeApplicationNo. 883160 filed on 06/26/1997US Classes:375/136, Receiver342/402, Doppler342/418, Doppler342/419, Portable375/142, Having correlation-type receiver375/150Correlation-type receiverExaminersPrimary: Chin, StephenAssistant: Park, Albert Attorney, Agent or FirmForeign Patent References
International ClassesH04L 027/30G01S 001/44 G01S 003/52 G01S 005/02 AbstractA direct sequence spread spectrum receiver samples an incoming signal and stores the sample in memory. Prior to sampling and storage, the incoming signal is translated to an IF signal. Also prior to storage, the IF signal is corrected for a frequency offset signal. The frequency offset may be caused by many sources, Doppler shift or local oscillator error, for example. Once the signal is corrected for the frequency offset, the signal sample is stored in memory. The signal sample is read from memory as necessary to process the signal. Such a receiver is useful in global positioning satellite (GPS) signal processing where the incoming signal contains several satellite transmissions encoded with CDMA encoding. | |
