Huan-Wan Tseng

8269667, Sep 18, 2012

Nov 16, 2011

13/373494

Wallace E. Vander Velde - Winchester MA, US
John H. Cafarella - Swampscott MA, US
Huan-Wan Tseng - Westford MA, US
George Dimos - Lexington MA, US
Triveni N. Upadhyay - Concord MA, US
Jianhui Luo - Westborough MA, US

Mayflower Communications Company, Inc. - Burlington MA

G01S 19/53

34235736

A system and method for determining the roll rate and roll angle of a spinning platform by using the measured phase and/or amplitude differences between the GPS satellite signals received on two or more antennas. The measured signal differences and the navigation solution from a GPS receiver are processed in a roll filter to obtain the desired information. Data from non-GPS measurement sources is optionally provided to update the navigation solution. Although of wide applicability, the invention is uniquely suited to the measurement of roll rates and roll angles of fast spinning platforms with small baselines in the presence as well as in the absence of jamming, and where the antennas are separated from each other by distances that are a fraction of the GPS signal wavelength.

7994971, Aug 9, 2011

Jan 9, 2008

12/008141

Wallace Vander Velde - Winchester MA, US
John Cafarella - Swampscott MA, US
Huan-Wan Tseng - Westford MA, US
George Dimos - Lexington MA, US
Triveni Upadhyay - Concord MA, US

Mayflower Communications Company, Inc. - Burlington MA

G01S 19/54

34235737

A system and method for determining the roll rate and roll angle of a spinning platform, using the measured phase differences between the GPS satellite signals received on two or more antennas. The measured phase differences and the navigation solution from a GPS receiver are processed in a Kalman filter to obtain the desired information. Data from non-GPS measurement sources is optionally provided to update the navigation solution. Although of wide applicability, the invention is uniquely suited to the measurement of roll rates and roll angles of fast spinning platforms with small baselines, in which the antennas are separated from each other by distances that are a fraction of the GPS signal wavelength.

20100289687, Nov 18, 2010

May 15, 2009

12/454306

Wallace E. Vander Velde - Winchester MA, US
John H. Cafarella - Swampscott MA, US
Huan-Wan Tseng - Westford MA, US
George Dimos - Lexington MA, US
Jianhui Luo - Westborough MA, US

G01S 7/36
G01S 19/14
G01S 19/40

342 16, 34235736, 34235759

A system and method for determining the roll rate and roll angle of a spinning platform in a jamming environment, by suppressing the interference signals from the received GPS signals and using the measured phase and amplitude differences between the GPS satellite signals received on two or more antennas. The measured signal differences and the navigation solution from a GPS receiver are processed in a roll filter to obtain the desired information. Data from non-GPS measurement sources is optionally provided to update the navigation solution. Although of wide applicability, the invention is uniquely suited to the measurement of roll rates and roll angles of fast spinning platforms with small baselines in the presence of jamming, and where the antennas are separated from each other by distances that are a fraction of the GPS signal wavelength.

20130169477, Jul 4, 2013

Jan 3, 2012

13/374551

Jianhui Luo - Wayland MA, US
Wallace E. Vander Velde - Winchester MA, US
Huan-Wan Tseng - Westford MA, US
Triveni N. Upadhyay - Concord MA, US

G01S 19/54

34235737, 34235736

System and method for determining the roll rate and roll angle of a spinning platform. The IQ amplitude and/or phase characteristics of GPS signals received at a single receiver antenna are measured using the signals output directly by a correlator that is driven at the satellite tracking frequency used for forming the navigation solution. The roll rate and roll angle are determined in real time by a Roll filter, which is preferably an Extended Kalman Filter (EKF) employing probabilistic data association, whose inputs include the measured IQ characteristics and the navigation solution. Data from non-GPS measurement sources is optionally provided to update the navigation and/or roll solution.

20200241145, Jul 30, 2020

Jan 29, 2019

16/260468

- Bedford MA, US
Huan-Wan Tseng - Westford MA, US
William LeComte - Burlington MA, US

Mayflower Communications Company, Inc. - Bedford MA

G01S 19/21
G01S 19/24
G01S 19/23

System and method for concurrently protecting Iridium and GPS L1/L2 band received satellite signals against interference signals (e.g., jamming signals) using space-time adaptive processing (STAP). While the GPS signal is protected against jamming using Nulling of the interfering signals, the Iridium signal is protected using Beamforming. A single broadband small controlled reception pattern antenna (sCRP) array receives both the GPS (L1 and L2) and Iridium signals for the STAP-based antijam solutions outputting filtered Iridium and GPS signals. Use of a common (small) broadband antenna and common front end signal processing of the received signals enables an integrated system for use on size, weight, and power constrained platforms such as drones, unmanned aerial vehicles (UAVs), and helicopters.

20150226856, Aug 13, 2015

Dec 2, 2013

14/093572

- Burlington MA, US
Jianhui Luo - Wayland MA, US
Huan-Wan Tseng - Westford MA, US

Mayflower Communications Company, Inc. - Burlington MA

G01S 19/21

System and method for mean phase compensation of code and carrier phase distortions induced by Space Time Adaptive Processing (STAP) filters used for removing interferences from received GPS signals. The phase distortion is mitigated (without the use of beamforming) using a single STAP filter for processing the GPS satellite channels in which appropriate bundling of constraints is applied to the filter weights. The complete solution can be contained in the antenna electronics with no required changes to the legacy GPS receiver.