US Patent No: 6,239,742
Number of patents in Portfolio can not be more than 2000
Method and apparatus for satellite positioning system based time measurement
Stats
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May 29, 2001
Issued date -
Apr 17, 2000
filing date -
09/550,450
serial no -
In Force
status
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Abstract
A method and apparatus for measuring time related to satellite data messages which are used with satellite positioning systems (SPS). In one method, a first record of at least a portion of a satellite data message is received at an entity, which is typically a basestation. The first record is compared with a second record of the satellite data message, where the first record and the second record overlap at least partially in time. Then a time is determined from this comparison, and this time indicates when the first record (or the source from which the first record was obtained) was received at a remote entity which is typically a mobile SPS receiver. Various other methods of the invention are described and various apparatuses of the invention are also described. The methods and apparatuses measure time of day using SPS signals without reading the satellite data messages which are transmitted as data within these signals. The methods and apparatuses are suitable for situations in which the received signal level is too weak to allow reading of the satellite data messages.
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First Claim
Related Publications
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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
|---|---|---|---|
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| 5,319,374 Precise universal time for vehicles | 131 | 1993 | |
| 5,510,797 Provision of SPS timing signals | 93 | 1993 | |
| 5,521,887 Time transfer system | 42 | 1993 | |
| 5,625,556 Accurate time standard for vehicle operation | 23 | 1995 | |
| 5,841,026 Automatic transference between real-time operation and post-processing in a GPS survey system | 25 | 1996 | |
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| 5,225,842 Vehicle tracking system employing global positioning system (GPS) satellites | 395 | 1991 | |
| 5,379,224 GPS tracking system | 291 | 1991 | |
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| 5,317,323 Passive high accuracy geolocation system and method | 225 | 1993 | |
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| 4,449,830 Method and apparatus for measuring elapsed time between an initiating event and a dependent event | 19 | 1981 | |
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| 5,640,442 Technique for determining propagating and clear frequency to be used in wide area wireless data communications network | 26 | 1996 | |
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| 5,317,322 Null processing and beam steering receiver apparatus and method | 24 | 1993 | |
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| 4,734,701 Null processing receiver apparatus and method | 30 | 1986 | |
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| 5,570,097 Retransmitted GPS interferometric system | 19 | 1995 | |
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| 5,420,592 Separated GPS sensor and processing system for remote GPS sensing and centralized ground station processing for remote mobile position and velocity determinations | 191 | 1993 | |
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| 5,117,232 Global system positioning receiver | 38 | 1991 | |
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| 5,812,087 Method and apparatus for satellite positioning system based time measurement | 274 | 1997 | |
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| 4,445,118 Navigation system and method | 461 | 1981 | |
Patent Citation Ranking
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Nov 29, 2012 |
| Fee | Large entity fee | small entity fee | micro entity fee |
|---|---|---|---|
| Surcharge - 11.5 year - Late payment within 6 months | $160.00 | $80.00 | $40.00 |
| Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
| Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |