Chun Yang

US Patent:

6598009, Jul 22, 2003

Filed:

Feb 1, 2001

Appl. No.:

09/773079

Inventors:

Chun Yang - Harleysville PA 19438

International Classification:

G01C 1700

US Classification:

702152, 702 94, 702150, 701200, 701213, 701215, 34235706, 34235711, 342423

Abstract:

A GPS receiver that determines its own attitude under jamming conditions is created by augmenting it with an array antenna and a novel signal processing system. The augmented signal processing system comprises a cascaded parallel architecture inserted between the array antenna and the GPS receiver. A blind adaptive nulling processor is cascaded ahead of the GPS receiver so that the GPS receiver can operate on the jamming-suppressed signals in a normal manner. A monopulse angular measurement unit in series with an attitude determination unit interacts in parallel with the blind adaptive nulling processor and the GPS receiver. Constrained beamforming adaptive monopulse is used to simultaneously place nulls in both the sum and difference beams toward jammers while maintaining the monopulse ratio for accurate angular measurement. In this way, the GPS receiver is capable of providing rotational information in addition to regular time and translation information.

US Patent:

7388541, Jun 17, 2008

Filed:

Nov 27, 2006

Appl. No.:

11/604151

Inventors:

Chun Yang - Harleysville PA, US

International Classification:

G01S 3/02

US Classification:

342464

Abstract:

A broadcast digital transmission (BDT) receiver, computer-readable media, and associated method for receiving and processing of BDT signals from a plurality of transmitters. A BDT receiver includes an antenna to intercept broadcast radio signals and an analog front-end to down-convert it to a suitable frequency for digitization. A baseband signal processor acquires and tracks designated codes in BDT signals using a generalized correlator to produce time of arrival measurements thereof. A data processor, coupled to the baseband signal processor and with input from an auxiliary sensor and a digital database, first calibrates time offsets of said transmitters relative to the BDT receiver's time base and then operates on offset-adjusted time of arrival measurements to produce a position solution.

US Patent:

7471241, Dec 30, 2008

Filed:

Jul 25, 2005

Appl. No.:

11/188258

Inventors:

Chun Yang - Harleysville PA, US

International Classification:

G01S 5/14

US Classification:

34235712, 34235715

Abstract:

A Global Navigation Satellite System (GNSS) receiver and associated method for the reception and processing of GNSS signals. The GNSS receiver includes an antenna and an analog front-end to intercept the incoming radio-frequency signal and to convert it to an appropriate intermediate frequency for digital sampling. A baseband signal processor is organized into functionally identical channels, each dynamically assigned to a different satellite visible. The baseband signal processor processes the signal samples to generate the satellite signal channel impulse response for a number of Doppler frequency shifts. This results in a two-dimensional delay-Doppler map of satellite signal responses from which the baseband signal processor extracts the code time and carrier phase and frequency parameters as well as navigation data for timing, positioning, and environment mapping in the data processor.

US Patent:

7522100, Apr 21, 2009

Filed:

Jul 1, 2005

Appl. No.:

11/173894

Inventors:

Chun Yang - Harleysville PA, US
Hansheng Wang - San Jose CA, US

Assignee:

SiRF Technology Holdings, Inc. - San Jose CA

International Classification:

G01S 1/00

US Classification:

34235712

Abstract:

A Global Navigation Satellite System (GNSS) receiver and associated method capable of acquiring weak GNSS signals from a plurality of GNSS satellites produces a GNSS signal's code time, carrier frequency, and data bit transition parameters for subsequent signal tracking and position fixing. The GNSS receiver includes a baseband signal processor with special functionalities for acquiring weak signals. In a preferred embodiment, the time and frequency uncertainty space is reduced using available information and then special techniques are used to rapidly search the remaining uncertainty space. Successive reversal of short-length correlations within a data bit interval (a block) enables data bit transition detection and data bit sign correction prior to coherent integration. Fast Fourier Transform (FFT) is applied as a bank of bandpass filters to coherently accumulate blocks of short-length correlations over extended coherent integration intervals to boost the signal power while averaging noise out despite unknown data bit transitions.

US Patent:

6407699, Jun 18, 2002

Filed:

Apr 14, 2000

Appl. No.:

09/550064

Inventors:

Chun Yang - Harleysville PA 19438

International Classification:

H04K 100

US Classification:

34235712, 342378, 342418, 375343

Abstract:

A GPS receiver and associated method that embodies high-dynamic, fast acquisition, and interference-suppressing capabilities for the reception and processing of GPS signals from a plurality of GPS satellites to produce GPS signal time and frequency parameters and navigation fixes. The GPS receiver includes an antenna and an analog front-end to intercept the incoming radio-frequency signal, band-limiting amplify the signal, and to convert it to an appropriate intermediate frequency so that it may be converted to digital form. One or more high-speed digital signal processors (DSP) constitute an all digital software baseband processor that process the sampled and quantified signals to form a two-dimensional delay-Doppler map of correlation power and to extract the signal time and frequency parameters and navigation data. The baseband processor is organized into functionally identical channels, each dynamically assigned to a different satellite visible. The baseband processor performs the incoming signal time-tagging, transformation, replica generation, interference-suppressing, delay-Doppler mapping and frequency uncertainty planning.