Did You Know...
...Chester Carlson was a patent agent who tired of having to make multiple copies of patent applications using the only duplication method available at the time: carbon paper. In 1959 he came up with a new copying system and took it to IBM for evaluation. The "experts" at IBM determined potential sales to be only 5,000 units because people wouldn't want to use a bulky machine when they had carbon paper. Carlson's invention was the xerography process, the company founded on the system is Xerox.
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| Number | Title | Issue Date |
| 7598909 | Keeping accurate time for a hybrid GPS receiver and mobile phone when powered off A hybrid navigation satellite receiver and mobile telephone uses only two crystal oscillators. One that operates a master clock around 27-MHz and that consumes milliwatts of power. The other oscillator consumes only microwatts of power and operates continuously on b... | 10/06/2009 |
| 7592951 | Device and method for minimizing the number of crystal oscillators used in an integrated navigation receiver and cellphone A hybrid navigation satellite receiver and mobile telephone uses only two crystal oscillators. One that operates a master clock around 27-MHz and that consumes milliwatts of power. The other oscillator consumes only microwatts of power and operates continuously on b... | 09/22/2009 |
| 7498983 | Extended range high sensitivity SPS positioning receiver A roving extended range high sensitivity satellite positioning system receiver provides position fixes in adverse signal conditions as low as minus 150 dbm and with as few as three satellites by measuring the bit phase of the navData message and the codephase, and f... | 03/03/2009 |
| 7495609 | Mobile GPS aiding data solution A mobile GPS-aiding system uses a GPS reference receiver to collect GPS navigation messages, a GPS-aiding data network server to distribute over the Internet all ephemeris and almanac data gleaned from the navigation messages, a number of commercial broadcast radio ... | 02/24/2009 |
| 7463188 | Wireless CPU GPS application A wireless handheld GPS-enabled device and supporting system comprises a wireless CPU that functions as a host processor, a GPS chipset to provide GPS measurements, and a GPS application hosted by the wireless CPU. Other applications are also hosted by the wireless ... | 12/09/2008 |
| 7437138 | All CMOS GPS receiver with noise-matched high impedance on-chip antenna A GPS receiver depends on CMOS technology for both its GPS digital signal processing (DSP) and radio frequency (RF) stages. A resulting increase in RF input noise generated by the CMOS RF input is overcome by placing the antenna on-chip or on a lid of an application... | 10/14/2008 |
| 7415353 | Satellite-position table messaging A navigation satellite receiver accepts satellite-position table messages comprising truncated GPS ephemeris parameters. In particular, at least one of the two harmonic corrections to inclination angle, Cic and Cis, are not communicated and not used in the solution ... | 08/19/2008 |
| 7362263 | Keeping accurate time for a hybrid GPS receiver and mobile phone when powered off A hybrid navigation satellite receiver and mobile telephone uses only two crystal oscillators. One that operates a master clock around 27-MHz and that consumes milliwatts of power. The other oscillator consumes only microwatts of power and operates continuously on b... | 04/22/2008 |
| 7224950 | Estimating GPS reference frequency drift from PDC-handset VCO-bursts A combination mobile phone and navigation satellite receiver comprises a circuit for correcting GPS receiver reference frequency drift by using VCO burst information periodically received by a PDC handset. A corrected GPS receiver reference frequency drift then enab... | 05/29/2007 |
| 7200414 | Client-aiding with cellphones in a 150-KM radius area A cellphone system comprises a GPS reference station located with a telephone cell site. Such GPS reference station tracks the GPS satellites visible to its local area and estimates the Doppler for each such GPS satellite. The system also includes mobile GPS receive... | 04/03/2007 |
| 7123190 | Skipping z-counts and accurate time in GPS receivers A navigation-satellite receiver comprises high-sensitivity radio frequency front-end and navigation processor associated with a client CPU. The client CPU runs an operating system that serially communicates with the navigation processor. The client CPU is also able ... | 10/17/2006 |
| 7019689 | Skipping z-counts and accurate time in GPS receivers A navigation-satellite receiver comprises high-sensitivity radio frequency front-end and navigation processor associated with a client CPU. The client CPU runs an operating system that serially communicates with the navigation processor. The client CPU is also able ... | 03/28/2006 |
| 6941109 | Computing network path delays so accurate absolute time can be forwarded from a server to a client A navigation-satellite receiver support data network comprises a server connected to the Internet to provide initialization information to clients for faster cold starts. The server includes a GPS receiver that provides for tracking of a constellation of navigation ... | 09/06/2005 |
| 6714160 | Real time clock for GPS receivers A navigation-satellite receiver comprises a real-time clock that can be slaved to the highly accurate time base of the GPS system. During such times, the amount of correction and the operating temperature are both tracked. It is assumed the operating temperature wil... | 03/30/2004 |
