Patents by Inventor Mangesh M. Chansarkar
Mangesh M. Chansarkar has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 7751974Abstract: A method for navigation processing in a satellite positioning system receiver is disclosed. A method in accordance with the present invention comprises separating the three SATPS satellites into a first pair and a second pair, constructing a primary solution and an alternate solution, wherein the primary solution and the alternate solution satisfy the measurement constraints, computing a Doppler difference estimate for the primary solution and a Doppler difference estimate for the alternate solution, computing Doppler difference residuals for the first pair and the second pair of SATPS satellites, and comparing the Doppler difference residuals for said primary and alternate solutions to determine a valid solution. Typically, the computing of a Doppler difference residuals comprises differencing a measured Doppler difference from an estimated Doppler difference for the first pair and the second pair of SATPS satellites.Type: GrantFiled: March 17, 2005Date of Patent: July 6, 2010Assignee: SiRF Technology, Inc.Inventors: Keith Jacob Brodie, David Allan Tuck, Mangesh M. Chansarkar
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Patent number: 6885940Abstract: A method for navigation processing in a satellite positioning system receiver is disclosed. A method in accordance with the present invention comprises separating the three SATPS satellites into a first pair and a second pair, constructing a primary solution and an alternate solution, wherein the primary solution and the alternate solution satisfy the measurement constraints, computing a Doppler difference estimate for the primary solution and a Doppler difference estimate for the alternate solution, computing Doppler difference residuals for the first pair and the second pair of SATPS satellites, and comparing the Doppler difference residuals for said primary and alternate solutions to determine a valid solution. Typically, the computing of a Doppler difference residuals comprises differencing a measured Doppler difference from an estimated Doppler difference for the first pair and the second pair of SATPS satellites.Type: GrantFiled: October 21, 2003Date of Patent: April 26, 2005Assignee: Sirf Technology, Inc.Inventors: Keith Jacob Brodie, David Allan Tuck, Mangesh M. Chansarkar
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Publication number: 20040189516Abstract: A method for navigation processing in a satellite positioning system receiver is disclosed. A method in accordance with the present invention comprises separating the three SATPS satellites into a first pair and a second pair, constructing a primary solution and an alternate solution, wherein the primary solution and the alternate solution satisfy the measurement constraints, computing a Doppler difference estimate for the primary solution and a Doppler difference estimate for the alternate solution, computing Doppler difference residuals for the first pair and the second pair of SATPS satellites, and comparing the Doppler difference residuals for said primary and alternate solutions to determine a valid solution. Typically, the computing of a Doppler difference residuals comprises differencing a measured Doppler difference from an estimated Doppler difference for the first pair and the second pair of SATPS satellites.Type: ApplicationFiled: October 21, 2003Publication date: September 30, 2004Inventors: Keith Jacob Brodie, David Allan Tuck, Mangesh M. Chansarkar
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Patent number: 6665612Abstract: A method for navigation processing in a satellite positioning system receiver is disclosed. A method in accordance with the present invention comprises separating the three SATPS satellites into a first pair and a second pair, constructing a primary solution and an alternate solution, wherein the primary solution and the alternate solution satisfy the measurement constraints, computing a Doppler difference estimate for the primary solution and a Doppler difference estimate for the alternate solution, computing Doppler difference residuals for the first pair and the second pair of SATPS satellites, and comparing the Doppler difference residuals for said primary and alternate solutions to determine a valid solution. Typically, the computing of a Doppler difference residuals comprises differencing a measured Doppler difference from an estimated Doppler difference for the first pair and the second pair of SATPS satellites.Type: GrantFiled: August 29, 2001Date of Patent: December 16, 2003Assignee: SiRF Technology, Inc.Inventors: Keith Jacob Brodie, David Allan Tuck, Mangesh M. Chansarkar
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Patent number: 6643587Abstract: A navigation system for tracking the position of an object includes a GPS receiver responsive to GPS signals for periodically providing navigation state measurement updates to a navigation processor. The system also includes a dead-reckoning sensor responsive to movement of the object for providing movement measurements to the navigation processor. The navigation processor determines object navigation states using the navigation state measurement updates and propagates the object navigation states between measurement updates using the movement measurements.Type: GrantFiled: February 26, 2002Date of Patent: November 4, 2003Assignee: SiRF Technology, Inc.Inventors: Keith J. Brodie, Stephen F. Rounds, Mangesh M. Chansarkar
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Patent number: 6618670Abstract: The invention describes methods and apparatuses for determining a user position based on a minimization of the errors introduced into the GPS system because of clock bias, noise, multipath, or other uncertainties. By overdetermining position, for example, clock biases can be removed from the system.Type: GrantFiled: September 14, 2001Date of Patent: September 9, 2003Assignee: SIRF Technology, Inc.Inventor: Mangesh M. Chansarkar
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Patent number: 6539304Abstract: A GPS receiver includes a satellite receiver/processor having an input that receives input signals from at least one GPS satellite. The output of the receiver/processor provides satellite-related navigation information. A neural network receives the satellite-related information to obtain an output signal representative of receiver-related navigation information. The neural network includes a first node layer connected to a second node layer through a first connection layer and a third node layer connected to the second node layer through a second connection layer. Each of the node layers comprises a plurality of neurons.Type: GrantFiled: November 2, 2001Date of Patent: March 25, 2003Assignee: SiRF Technology, Inc.Inventor: Mangesh M. Chansarkar
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Patent number: 6453238Abstract: A navigation system for tracking the position of an object includes a GPS receiver responsive to GPS signals for periodically providing navigation state measurement updates to a navigation processor. The system also includes a dead-reckoning sensor responsive to movement of the object for providing movement measurements to the navigation processor. The navigation processor determines object navigation states using the navigation state measurement updates and propagates the object navigation states between measurement updates using the movement measurements.Type: GrantFiled: September 15, 2000Date of Patent: September 17, 2002Assignee: SiRF Technology, Inc.Inventors: Keith J. Brodie, Stephen F. Rounds, Mangesh M. Chansarkar
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Publication number: 20020128775Abstract: A navigation system for tracking the position of an object includes a GPS receiver responsive to GPS signals for periodically providing navigation state measurement updates to a navigation processor. The system also includes a dead-reckoning sensor responsive to movement of the object for providing movement measurements to the navigation processor. The navigation processor determines object navigation states using the navigation state measurement updates and propagates the object navigation states between measurement updates using the movement measurements.Type: ApplicationFiled: February 26, 2002Publication date: September 12, 2002Inventors: Keith J. Brodie, Stephen F. Rounds, Mangesh M. Chansarkar
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Patent number: 6351711Abstract: A GPS receiver includes a satellite receiver/processor having an input that receives input signals from at least one GPS satellite. The output of the receiver/processor provides satellite-related navigation information. A neural network receives the satellite-related information to obtain an output signal representative of receiver-related navigation information. The neural network includes a first node layer connected to a second node layer through a first connection layer and a third node layer connected to the second node layer through a second connection layer. Each of the node layers comprises a plurality of neurons.Type: GrantFiled: September 14, 2000Date of Patent: February 26, 2002Assignee: Sirf Technology, Inc.Inventor: Mangesh M. Chansarkar