Snaptrack Incorporated

Qualcomm Incorporated

Nextnav, LLC

Spacenet, Inc.

Ge Capital Spacenet Services, Inc.

Other

Intel Corporation

Gilat Satellite Networks Ltd.

Diablo Research Corporation

Whisper Communications, Inc.

Precision Tracking, Inc.

Norman Franklin Krasner

Arun Raghupathy

Leonid Sheynblat

Andrew Sendonaris

Mark Leo Moeglein

Edward Vincent Jolley

Chen Meng

Philip M Freidin

Thomas George Wolf

Joseph S Chan

Charles A Glorioso

David George Decker

Richard John Girerd

Leland M Farrer

Robert F Garry, Jr

Bruce Joseph Currivan

David Harold Coleman

Anthony P Mauro

Jagadish Venkataraman

Allen P Edwards

Michael J Serrone

Paul A Conflitti

Bhaskar Nallapureddy

Ronald Loye Kronz

Sameet Deshpande

Brian J Glinsman

William A Check

Robert F Fleming, Iii

Anjali Jha

David B Kim

Joseph A Chisholm

Paul Conflitti

William G Xenakis

Edward V Jolley

Embodiments describe determining position by selecting a set of digital pseudorandom sequences. The magnitudes of the cross-correlation between any two sequences of the chosen set are below a specified threshold. A subset of digital pseudorandom sequences are selected from the set such that the magnitudes of the autocorrelation function of each member of the subset, within a specified region adjacent to the peak of the autocorrelation function, are equal to or less than a prescribed value. Each transmitter transmits a positioning signal, and at least a portion of the positioning signal is modulated with at least one member of the subset. At least two transmitters of the plurality of transmitters modulate respective positioning signals with different members of the subset of digital pseudorandom sequences.

Coding in a positioning system

A position location system comprises transmitters that broadcast positioning signals. Each broadcasted positioning signal comprises a pseudorandom ranging signal. The position location system includes a remote receiver that acquires and measures the time of arrival of the positioning signals received at the remote receiver. During an interval of time, at least two positioning signals are transmitted concurrently by the transmitters and received concurrently at the remote receiver. The two positioning signals have carrier frequencies offset from one another by an offset that is less than approximately twenty-five percent of the bandwidth of each positioning signal of the two positioning signals. Cross-interference between the positioning signals is reduced by tuning the remote receiver to a frequency of a selected signal of the two positioning signals and correlating the selected signal with a reference pseudorandom ranging signal matched to a transmitted pseudorandom ranging signal of the selected signal.

Cell organization and transmission schemes in a wide area positioning system

Devices, systems, and methods for sending positional information from transmitters/beacons. In one implementation a transmitter generates a range block including a ranging signal and a hybrid block including positioning data, and sends the range block and hybrid block at different times. A user device may receive signals from a plurality of transmitters and generates position/location information using trilateration and measured altitude information in comparison with transmitter altitude information.

Signaling in a wireless positioning system

Generating signals from non-GNSS transmitters, and processing the signals using a GNSS positioning module. Systems and methods identify a chipping rate, identify a PN code length, generate a PN code that has a length equal to the identified PN code length, generate a positioning signal using the identified chipping rate and the generated PN code, and transmit the positioning signal from the transmitter. The PN code length may produce, at the identified chipping rate, a PN code duration that is equal to or is a multiple of a PN code duration used in a GNSS system, the identified chipping rate may be equal to or a multiple of a chipping rate used in a GNSS system, and the identified PN code length may be equal to or a multiple of a PN code length used in a GNSS system.

Systems and methods for generating signals from terrestrial transmitters, and for processing the signals using GNSS receiver hardware

Devices, systems, and methods for improving performance in positioning systems. Performance may be improved using disclosed signal processing methods for separating eigenvalues corresponding to noise and eigenvalues corresponding to one or more direct path signal components or multipath signal components.

Methods and apparatus for improving time of arrival determination

Cell organization and transmission schemes in a wide area positioning system (WAPS)

An interference removal filter that includes a combination of a first filter and a second filter, where the first filter passes signals over a frequency range of size B with a variation of less than +/&#x2212;3 dB, where the peak value of the impulse response of the second filter is displaced in time from the peak value of the impulse response of the first filter by at least 2/B time units, and where the combination of the first filter and the second filter produces a notch in frequency at a frequency location within the frequency range.

Interference mitigation for positioning systems

Systems and methods for improving performance in terrestrial and satellite positioning systems. Signal processing systems and methods are described for selecting, from among a set of codes, certain codes having desired autocorrelation and/or cross-correlation properties. Systems and methods for generating, encoding, transmitting, and receiving signals using the selected codes are also described.

Systems and methods for pseudo-random coding

Described are systems and methods for estimating a position of receiver using ranging signals from different regions in a network of transmitters. In some embodiments, each ranging signal that exceeds a quality criterion is assigned to one of several defined regions based on a characteristic of that ranging signal. A maximum number of ranging signals per region may be selected and used during trilateration.

Directional pruning of transmitters to improve position determination

Systems and methods for improving performance in terrestrial and satellite positioning systems are disclosed. Signal processing systems and methods are described for selecting, from among a set of codes, certain codes having desired autocorrelation and/or cross-correlation properties. Systems and methods for generating, encoding, transmitting, and receiving signals using the selected codes are also described.

Growing community of inventors

Redwood City, CA, United States of America

Norman Franklin Krasner