Method for a space-efficient gps receiver

Title: Method for a space-efficient gps receiver

Brief Patent Description - Full Patent Description - Patent Claims

The Patent Description & Claims data below is from USPTO Patent Application 20090002231, Method for a space-efficient gps receiver.

1. In a GPS receiver, a method for storing satellite orbital parameters, comprising: receiving an ephemeris and almanac data of a satellite; comparing the week number and reference time associated with the ephemeris with the week number and reference time associated with the almanac data; and based on the comparison, selecting the more recent one of the ephemeris and the almanac data to be stored in a non-volatile memory of the GPS receiver.

2. A method as in claim 1, further comprising, when the GPS receiver is power up, retrieving from the non-volatile memory of the GPS receiver the stored almanac data or ephemeris to compile a list of visible satellites.

3. A method as in claim 1 wherein, for each satellite, only the more recent one of the ephemeris and the almanac data is stored in the non-volatile memory.

4. A method as in claim 1, wherein the non-volatile memory comprises a random access memory element.

5. A method as in claim 1 further comprising computing a position or a velocity of the satellite using the more recent one of the almanac data and the ephemeris.

6. A method as in claim 5, further comprising determining whether or not the satellite is visible to the GPS receiver based on the computing.

7. A method as in claim 1 wherein when only an ephemeris but not almanac data is available for the GPS receiver to compute a position or a velocity of a satellite, the GPS receiver computes the position or velocity of the satellite using the ephemeris.

Brief Patent Description - Full Patent Description - Patent Claims

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Patent Applications in related categories:

20090289848 - Gps for communications facility records - Methods and systems are disclosed for enhancing line records with Global Positioning System coordinates. Global Positioning System information is acquired and a line record is assembled for an address using the Global Positioning System information. ...

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Previous Patent Application:
Gps data recording apparatus and related method thereof
Next Patent Application:
Methods and apparatuses for searching for satellite signals
Industry Class:
Communications: directive radio wave systems and devices (e.g., radar, radio navigation)

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