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Makarand Shankar Phatak

from San Jose, CA
Age ~61
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Also known as:
Makarand S Phatak, Pradnya Vaze
Related to:
Sameehan M Phatak, 31Pradnya A Vaze, 57Pradnya A Vaze, 61Rishi Anant Vaze, 57
Connected to:
Amey M Phatak, 38Arvind V Phatak, 85Ashwin P Phatak, 38Damodar S Phatak, 51Devin G Phatak, 43Kaustubh Phatak, 35Kush S Phatak, 56Meena V Phatak, 91Nitin S Phatak, 63Parag V Phatak, 52

Makarand Phatak Phones & Addresses

  • San Jose, CA
  • Cupertino, CA
  • 936 Azure St, Sunnyvale, CA 94087 (408) 730-4060

Resumes

Resumes

Makarand Phatak Photo 1

Indian Institute Of Science

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Location:
San Francisco, CA
Industry:
Research
Work:

Indian Institute of Science
Skills:
Estimation and Control
Makarand Phatak Photo 2

Staff Systems Engineer

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Location:
7375 Rollingdell Dr, Cupertino, CA 95014
Industry:
Semiconductors
Work:
Sirf Technology
Staff Systems Engineer

Publications

Us Patents

Determining Position Without Use Of Broadcast Ephemeris Information

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US Patent:
7403154, Jul 22, 2008
Filed:
Nov 28, 2006
Appl. No.:
11/563896
Inventors:
Lionel J. Garin - Palo Alto CA, US
Makarand S. Phatak - Sunnyvale CA, US
Assignee:
SiRF Technology, Inc. - San Jose CA
International Classification:
G01S 5/02
US Classification:
34235715, 34235706, 342419
Abstract:
Devices and methods are described for determining position information without broadcast ephemeris data for extended time periods. A server or client device receives or collects historical state data of satellites of a satellite-based positioning system and generates predictions of future satellite trajectories for future time periods. When a server generates the predictions, the predictions are subsequently transferred to a client device. The client device selects predictions appropriate to time of interest. The time can be any time during a period of at least seven calendar days. The client device reconstructs satellite states using information on the predictions and uses the reconstructed satellite states to acquire satellite signals as appropriate to the current location and time of the client device. The client device determines and/or tracks its position using information of the satellite states and timing information of the satellite signals.

Efficient Ephemeris Coding

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US Patent:
7839324, Nov 23, 2010
Filed:
Mar 30, 2007
Appl. No.:
11/694653
Inventors:
Makarand S. Phatak - Sunnyvale CA, US
Gengsheng Zhang - Cupertino CA, US
Marlene Wan - Sunnyvale CA, US
Assignee:
SiRF Technology, Inc. - San Jose CA
International Classification:
G01S 1/00
US Classification:
34235709
Abstract:
In one embodiment, a system is provided that is operable to: predict satellite states using historical satellite state data for at least one satellite of a satellite-based positioning system; derive sets of parameters representative of the predicted satellite states; differentially compress the sets parameters into sets of compressed parameters; transmit the sets of compressed parameters to a client device over a first communication channel; uncompress the sets of compressed parameters into sets of recovered parameters; selectively reconstruct at least one reconstructed satellite state in the client device using the sets of recovered parameters; and determine the position of the client device using the at least one reconstructed satellite state along with timing information of satellite data received over a second communication channel.

Determining Position Without Current Broadcast Ephemeris

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US Patent:
7839330, Nov 23, 2010
Filed:
Oct 31, 2006
Appl. No.:
11/555074
Inventors:
Lionel J. Garin - Palo Alto CA, US
Lars Boeryd - Rancho Santa Margarita CA, US
Makarand S. Phatak - Sunnyvale CA, US
Assignee:
SiRF Technology, Inc. - San Jose CA
International Classification:
G01S 1/00
H04B 7/185
US Classification:
34235766, 34235725
Abstract:
Devices and methods are described for determining position information without broadcast ephemeris data for extended time periods. A client device is disclosed that stores satellite states determined from broadcast ephemeris and numerically integrates equations of motion with regard to the stored satellite states to determine current satellites states. The client device uses the current satellite states in conjunction with received satellite signals to determine where the satellite signals were received.

Satellite Clock Prediction

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US Patent:
7839331, Nov 23, 2010
Filed:
Mar 30, 2007
Appl. No.:
11/694430
Inventors:
Makarand S. Phatak - Sunnyvale CA, US
Lionel J. Garin - Palo Alto CA, US
Marlene Wan - Sunnyvale CA, US
Assignee:
SiRF Technology, Inc. - San Jose CA
International Classification:
G01S 19/27
US Classification:
34235766
Abstract:
Devices and methods are described for determining position information without broadcast ephemeris data for a spanned time period using predictions of future satellite states. These predictions include predictions of satellite clock bias. During the spanned time period, broadcast ephemeris is received such that a broadcast-ephemeris-derived satellite clock bias may be determined. The predictions of satellite clock bias subsequent to the receipt of the broadcast ephemeris may then be corrected based upon the broadcast-ephemeris-derived satellite clock bias.

Method And Apparatus For Weak Data Frame Sync In A Positioning System

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US Patent:
7924220, Apr 12, 2011
Filed:
Nov 24, 2008
Appl. No.:
12/277044
Inventors:
Gary Lennen - Cupertino CA, US
Makarand Phatak - Sunnyvale CA, US
William Kerry Keal - Santa Clara CA, US
Assignee:
Sirf Technology Holdings, Inc. - San Jose CA
International Classification:
G01S 19/48
H04B 1/00
US Classification:
34235731, 375149
Abstract:
The present invention is related to location positioning systems, and more particularly, to a method and apparatus of synchronizing to data frames in a positioning system signal. According to one aspect, the invention speeds up the frame synchronization process by computing a frame synchronization metric for each satellite and then combining together the metrics for all tracked satellites together, after compensating for respective signal transit times. Then the invention makes a frame sync decision on the combined satellite metric. In embodiments, an optimal combining algorithm is used based on CNO of each satellite. According to further aspects, the invention further speeds up the frame synchronization process by predicting many bits in the subframe so that more bits are known in addition to the 8-bit preamble. For example, the invention recognizes that many bits in a subframe rarely change or don't change very often. Moreover, the invention uses old ephemeris used to predict new ephemeris parameters.

Method And Apparatus For Weak Data Frame Sync In A Positioning System

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US Patent:
8134501, Mar 13, 2012
Filed:
Apr 8, 2011
Appl. No.:
13/083498
Inventors:
Gary Lennen - Cupertino CA, US
Makarand Phatak - Sunnyvale CA, US
William Kerry Keal - Santa Clara CA, US
Assignee:
CSR Technology Holdings Inc. - San Jose CA
International Classification:
G01S 19/24
US Classification:
34235763
Abstract:
The present invention is related to location positioning systems, and more particularly, to a method and apparatus of synchronizing to data frames in a positioning system signal. According to one aspect, the invention speeds up the frame synchronization process by computing a frame synchronization metric for each satellite and then combining together the metrics for all tracked satellites together, after compensating for respective signal transit times. Then the invention makes a frame sync decision on the combined satellite metric. In embodiments, an optimal combining algorithm is used based on CNO of each satellite. According to further aspects, the invention further speeds up the frame synchronization process by predicting many bits in the subframe so that more bits are known in addition to the 8-bit preamble. For example, the invention recognizes that many bits in a subframe rarely change or don't change very often. Moreover, the invention uses old ephemeris used to predict new ephemeris parameters.

Systems And Methods For Synthesizing Gps Measurements To Improve Gps Location Availability

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US Patent:
8159393, Apr 17, 2012
Filed:
Nov 5, 2007
Appl. No.:
11/934832
Inventors:
Gang Xie - Fullerton CA, US
Makarand Shankar Phatak - Sunnyvale CA, US
Mangesh Chansarkar - Irvine CA, US
Anil Kumar Kandangath - Phoenix AZ, US
Assignee:
CSR Technology Inc. - San Jose CA
International Classification:
G01S 19/38
US Classification:
34235778
Abstract:
There are situations where GPS signals are received from less than four satellites. In order to improve the GPS location availability, disclosed here are systems and methods for synthesizing GPS measurements, which, together with fewer than four available real GPS signals, can be used to calculate a position fix. In particular, GPS range measurements for lost satellites, which are satellites that were previously tracked but are now not tracked, are synthesized to improve GPS signal availability. The synthesized measurements are used along with real measurements to enable accurate position fix even when GPS satellite availability is poor. Different synthesized measurement generation schemes, depending on whether an INS/DR aiding system is available, are further described herein.

Method And Apparatus For Using Gps Satellite State Computations In Glonass Measurement Processing

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US Patent:
8248301, Aug 21, 2012
Filed:
Jul 31, 2009
Appl. No.:
12/534034
Inventors:
Mangesh Chansarkar - Irvine CA, US
Keith Brodie - Tustin CA, US
Makarand Phatak - Sunnyvale CA, US
William Kerry Keal - Santa Clara CA, US
Assignee:
CSR Technology Holdings Inc. - Sunnyvale CA
International Classification:
G01S 19/33
US Classification:
34235773
Abstract:
The present invention is related to location positioning systems, and more particularly, to a method and apparatus for using satellite state information from two or more different satellite systems in navigation processing. According to one aspect, it makes use of GPS extended ephemeris functionality to produce satellite state vector estimates for GLONASS satellites. These satellite state vector estimates can be used alone or in combination with GPS satellite vectors to provide updates to the receiver's navigation processing. According to further aspects, the GLONASS satellite position and trajectory information is extrapolated with a GPS gravity model rather than the GLONASS model, thereby allowing it to be extrapolated more accurately and for longer periods of time than the GLONASS model allows.
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Makarand Shankar Phatak from San Jose, CA, age ~61 Get Report