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US5724316A
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GPS based time determining system and method
Assignee: VALUE STREET CONSULTING GROUP LLC
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Filing: 1995-09-26
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Granted: 1998-03-03
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Expires: 2015-09-26
Abstract
Abstract An audio entertainment/navigation system with updated time readings is provided especially for a mobile user. The navigation system receives GPS position information signals which are processed to determine current position latitude and longitude coordinates and direction of travel. A destination database includes a plurality of categorized destinations and corresponding destination position coordinates pertaining to the destinations. The destination database is stored on an interfacable memory card. A time change database is also included which contains time-related information such as time zone boundaries and special time change rules such as daylight saving time. The time-related information may be loaded into the system from an interfacable memory card. A time of day as referenced to a reference time and the date are also computed from the GPS signals. The time and date are compared with the time-related information so as to determine a current updated time and date which is used to periodically update the clock and may be displayed on a display. Also, a user may obtain a current time and date reading for a remote destination by entering the destination name or coordinates into the system.
Inventors
- 👤 Randall T. Brunts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:10
CPC Classifications
G; G08; G08G; G08G1/00; G08G1/09; G08G1/0962; G08G1/0968; G08G1/096855; G08G1/096861; G01; G01C; G01C21/00; G01C21/26; G01C21/34; G01C21/36; G01C21/3697; G04; G04R; G04R20/00; G04R20/02; G04R20/06; G08G1/096872
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
104 words
A method of providing current updated time of day, said method comprising the steps of: receiving GPS radio wave signals; determining a current position from said GPS radio wave signals; determining a reference time of day from said GPS radio wave signals; providing a clock for providing a measured time; determining a direction of travel; determining a speed of travel; determining an approximate current position as a function of the determined direction and speed of travel when GPS radio waves are unavailable; determining the current time of day as a function of the approximate current position; and displaying the determined current time of day.
Claim 2
Independent Claim
104 words
A method of providing current updated time of day, said method comprising the steps of: receiving GPS radio wave signals; determining a current position from said GPS radio wave signals; determining a reference time of day from said GPS radio wave signals; providing a clock for providing a measured time; determining a direction of travel; determining a speed of travel; determining an approximate current position as a function of the determined direction and speed of travel when GPS radio waves are unavailable; determining the current time of day as a function of the approximate current position; and displaying the determined current time of day.
Claim 3
Dependent Claim
153 words
In a GPS navigation and audio entertainment system having navigation control means, display means, a GPS receiver for receiving GPS radio wave signals and processing means for determining a current position, the improvement comprising: means for determining a reference time of day of said received GPS radio wave signals; a data base containing time-related information including time zone position boundaries mapped as a function of geographical position coordinates, said time-related information further including rules for defining changes in time; a clock for providing a measured time of day; means for determining a direction of travel; means for determining a speed of travel; means for calculating an approximate current position as a function of the determined direction and speed of travel when GPS radio wave signals are unavailable and calculating the current time of day for the approximate current position; and means for periodically updating the clock with the calculated current time of day.
Claim 4
Dependent Claim
153 words
In a GPS navigation and audio entertainment system having navigation control means, display means, a GPS receiver for receiving GPS radio wave signals and processing means for determining a current position, the improvement comprising: means for determining a reference time of day of said received GPS radio wave signals; a data base containing time-related information including time zone position boundaries mapped as a function of geographical position coordinates, said time-related information further including rules for defining changes in time; a clock for providing a measured time of day; means for determining a direction of travel; means for determining a speed of travel; means for calculating an approximate current position as a function of the determined direction and speed of travel when GPS radio wave signals are unavailable and calculating the current time of day for the approximate current position; and means for periodically updating the clock with the calculated current time of day.
Claim 5
Dependent Claim
169 words
A navigation system for use in a vehicle and having a clock which is automatically updated with a measured time of day based on time change boundaries, the system comprising: a radio wave receiver for receiving a position indicative signal and a reference time; means for determining a current position of the vehicle from the radio wave signal; memory containing time-related information including time zone position boundaries mapped as a function of geographical position coordinates, said time-related information further including rules for defining changes in time as a function of the geographical position coordinates; a clock for providing a measured time of day; means for determining a direction of travel; means for determining a speed of travel; means for calculating an approximate current position as a function of the determined direction and speed of travel when GPS radio wave signals are unavailable and calculating the current time of day for the approximate current position; and means for periodically updating the clock with the calculated current updated time of day.
Claim 6
Dependent Claim
169 words
A navigation system for use in a vehicle and having a clock which is automatically updated with a measured time of day based on time change boundaries, the system comprising: a radio wave receiver for receiving a position indicative signal and a reference time; means for determining a current position of the vehicle from the radio wave signal; memory containing time-related information including time zone position boundaries mapped as a function of geographical position coordinates, said time-related information further including rules for defining changes in time as a function of the geographical position coordinates; a clock for providing a measured time of day; means for determining a direction of travel; means for determining a speed of travel; means for calculating an approximate current position as a function of the determined direction and speed of travel when GPS radio wave signals are unavailable and calculating the current time of day for the approximate current position; and means for periodically updating the clock with the calculated current updated time of day.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-03-02 | 2001-09-01 | 2002-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-03-02 | 2005-09-01 | 2006-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-03-02 | 2009-09-01 | 2010-03-03 | $7700.00 | Window Closed / Lapsed |