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Shaowei Han

from Palo Alto, CA
Age ~60
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Also known as:
Shao Wei Han, Shao-Wei Han, Haowei Han, Wei Han Shao, Han Shao-Wei
Phone and address:
3087 South Ct, Palo Alto, CA 94306
(650) 251-9826
Related to:
Jeff N Han, 33Ping Wang, 64Ping Wang, 58
Connected to:
Agnes K Han, 70Ahyoung Han, 37Amber J Han, 48Ami Han, 41Andres S Han, 31Angel B Han, 39Anne E Han, 58Antonio Han, 28Ariel S Han, 46Bae C Han, 70

Shaowei Han Phones & Addresses

  • 3087 South Ct, Palo Alto, CA 94306 (650) 251-9826
  • Menlo Park, CA
  • 207 Bradford Dr, Sunnyvale, CA 94089 (408) 745-9645
  • San Jose, CA

Education

Degree: Associate degree or higher

Publications

Us Patents

Enhanced Real Time Kinematics Determination Method And Apparatus

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US Patent:
7042390, May 9, 2006
Filed:
Jul 2, 2003
Appl. No.:
10/610541
Inventors:
Shaowei Han - Palo Alto CA, US
Kevin Xinhua Chin - Palo Alto CA, US
Assignee:
Thales North America, Inc. - Santa Clara CA
International Classification:
G01S 5/14
US Classification:
34235702, 34235704
Abstract:
A method of and computer-readable medium containing instructions for high accuracy, reliable position determination. A high precision GPS-RTK system using the present novel techniques is initialized instantaneously or near instantaneously. To improve the computational efficiency and to improve the reliability of the procedure, advances in data functional and stochastic modeling, validation criteria, adaptation and system design were achieved. A position estimate using an integrated method is determined. Ambiguity resolution of the position estimate is enhanced by applying a quality control procedure using derived validation criteria. A second position estimate based on the enhanced ambiguity resolution is derived.

Enhanced Real Time Kinematics Determination Method And Apparatus

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US Patent:
7148843, Dec 12, 2006
Filed:
Jul 2, 2003
Appl. No.:
10/610541
Inventors:
Shaowei Han - Palo Alto CA, US
Kevin Xinhua Chin - Palo Alto CA, US
Assignee:
Thales North America, Inc. - Santa Clara CA
International Classification:
G01S 5/14
US Classification:
34235702, 34235704
Abstract:
A method of and computer-readable medium containing instructions for high accuracy, reliable position determination. A high precision GPS-RTK system using the present novel techniques is initialized instantaneously or near instantaneously. To improve the computational efficiency and to improve the reliability of the procedure, advances in data functional and stochastic modeling, validation criteria, adaptation and system design were achieved. A position estimate using an integrated method is determined. Ambiguity resolution of the position estimate is enhanced by applying a quality control procedure using derived validation criteria. A second position estimate based on the enhanced ambiguity resolution is derived.

Automatic Decorrelation And Parameter Tuning Real-Time Kinematic Method And Apparatus

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US Patent:
7298319, Nov 20, 2007
Filed:
Apr 19, 2004
Appl. No.:
10/826270
Inventors:
Shaowei Han - Palo Alto CA, US
Liwen Dai - Pomona CA, US
Assignee:
Magellan Navigation, Inc. - Santa Clara CA
International Classification:
G01S 5/14
G01C 21/20
US Classification:
34235702, 701213
Abstract:
A method of and computer-readable medium containing instructions for high accuracy, reliable position determination. The ADAPT-RTK Technology (Automatic Decorrelation and Parameter Tuning Real-Time Kinematic technology) is described using an innovative decorrelation algorithm to decorrelate the correlation between L1 and L2 measurements through a functional model and a stochastic model reducing the impact on performance of distance dependent biases.

System And Method For Fast Initialization Of Navigational Satellite Signal Receivers

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US Patent:
7324045, Jan 29, 2008
Filed:
May 6, 2005
Appl. No.:
11/124413
Inventors:
Jun Mo - San Jose CA, US
Hansheng Wang - San Jose CA, US
Chi-Shin Wang - Half Moon Bay CA, US
Shaowei Han - Palo Alto CA, US
Assignee:
SiRF Technology, Inc. - San Jose CA
International Classification:
G01S 1/00
H04B 7/185
H04B 1/00
US Classification:
34235715, 34235712, 34235702, 375147
Abstract:
The present invention provides a method and apparatus for a satellite navigation receiver to lock onto satellite signals in the cold start mode with no information on the receiver position, the satellite position, or time estimates stored in the receiver's memory. All satellites in a positioning system are divided into groups based on the satellite constellation structure. In an embodiment, the positioning system is the Global Positioning System (GPS) and all GPS satellites are divided into three groups. During initialization of the receiver, the satellites are searched per group to lock onto at least one satellite signal. Other satellites are then searched in a given order based on their respective distance or proximity to the first satellite acquired. This method reduces the Time-to-First-Fix (TTFF) ordinarily required by conventional receivers in the cold start mode.

Method And Apparatus For Self-Calibration And Adaptive Temperature Compensation In Gps Receivers

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US Patent:
7459984, Dec 2, 2008
Filed:
May 26, 2005
Appl. No.:
11/140492
Inventors:
Chi-Shin Wang - Half Moon Bay CA, US
Jun Mo - San Jose CA, US
Shaowei Han - Palo Alto CA, US
Hansheng Wang - San Jose CA, US
Assignee:
Sirf Technology Holdings, Inc. - San Jose CA
International Classification:
H03L 1/00
G01S 1/00
US Classification:
331176, 331158, 331 66, 34235706, 342352, 34235713
Abstract:
The invention provides a method and apparatus to optimally estimate and adaptively compensate the temperature-induced frequency drift of a crystal oscillator in a navigational signal receiver. A Read-Write memory encodes two tables, one for looking up frequency drift values versus temperature readings and another one for valid data confirmation on the first table. The initially empty look-up table is gradually populated with frequency drift values while the receiver computes the frequency drift along with its position. During initial start of the receiver or re-acquisition of satellite signals, the stored frequency drift value corresponding to the current temperature is used. If no valid frequency drift value is available, the frequency drift value is computed based on the existing frequency drift values in the table. This invention reduces the Time-To-First-Fix (TTFF) of the receiver and enables the receiver to self-calibrate, thus no additional factory calibration would be necessary.

Navigational Positioning Without Timing Information

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US Patent:
7535414, May 19, 2009
Filed:
Jun 7, 2007
Appl. No.:
11/759769
Inventors:
Shaowei Han - Palo Alto CA, US
Assignee:
SiRF Technology Holdings, Inc. - San Jose CA
International Classification:
G01S 1/02
G01S 5/14
US Classification:
34235704, 34235705, 34235712
Abstract:
Provided herein are systems and methods that enable a navigation receiver to determine receiver position using a low ppm (Parts Per Million) Real Time Clock (RTC) under weak satellite signal reception conditions without the need for timing information from navigation satellites or aiding systems. Under weak signal conditions, the receiver is unable to demodulate navigation data bits but may be able to synchronize with the one ms PN sequences and 20 ms data bit edges of a received signal. In this case, the receiver is unable to determine the signal travel time from the navigation data bits resulting in one ms and/or 20 ms integer ambiguities in the travel time. Systems and methods are provided for resolving these one ms and/or 20 ms integer ambiguities and correct or reconstruct the pseudorange measurements accordingly. The reconstructed pseudorange measurements are used to accurately determine the receiver position.

Method And Apparatus For Navigation Data Downloads From Weak Signals

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US Patent:
7545317, Jun 9, 2009
Filed:
Nov 10, 2006
Appl. No.:
11/558611
Inventors:
Shaowei Han - Palo Alto CA, US
Assignee:
SiRF Technology, Inc. - San Jose CA
International Classification:
G01S 1/00
H03K 9/00
US Classification:
34235702, 34235706, 34235712, 375316
Abstract:
The present invention provides systems and methods that enable a standalone receiver capable of downloading navigation data under weak signal conditions. In an embodiment, a standalone navigation receiver generates predicted satellite orbits based on the tracking history of the satellites stored in the receiver. The tracking history comprises historical navigation data previously received from the satellites. The receiver uses the predicted satellite orbit to generate navigation data such as ephemeris and almanac. Since the predicted satellite is accurate, the generated navigation data is similar to the navigation data transmitted by the navigation satellites, and can therefore be used by the receiver to correct the downloaded navigation data bits. Thus many of the bits of a downloaded navigation word, especially the higher order significant bits of the word can be corrected. The remaining bit errors can be resolved based on a parity check of the word.

Method And Apparatus In Standalone Positioning Without Broadcast Ephemeris

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US Patent:
7564406, Jul 21, 2009
Filed:
Nov 10, 2006
Appl. No.:
11/558614
Inventors:
Shaowei Han - Palo Alto CA, US
Assignee:
SiRF Technology, Inc. - San Jose CA
International Classification:
G01S 1/00
US Classification:
34235712
Abstract:
The present invention provides methods and system for enabling a standalone navigation receiver capable of generating receiver specific predicted satellite orbits based on historical navigation data collected by and stored in the receiver. Thus, the navigation receiver is able to use the predicted satellite orbits to obtain better Time-To-First-Fix (TTFF) and position accuracy without the need of connecting to a remote server and the associated communications system. In an embodiment, a standalone navigation receiver having sufficient memory collects navigation data from navigation satellites and generates predicted satellite orbits using the collected navigation data. Under weak signal conditions when decoding of the navigation data is not possible, the receiver uses the predicted satellite orbits to predict the accurate satellite positions or the set of ephemeris and the associated pseudoranges. The predicted orbits may be accurate for several days without the reception of broadcast ephemeris.
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Shaowei Han from Palo Alto, CA, age ~60 Get Report