Agency: Department of Defense | Branch: Navy | Program: STTR | Phase: Phase I | Award Amount: 80.00K | Year: 2011
An emitter detection and localization (EML) technique has been researched and developed that utilizes long-coherent integration. This technique enables EML over a broad range of emitter frequencies and signal types. The EML system is composed of sensor nodes and a processing center that carries out the bulk of the signal processing. Adaptive network bandwidth utilization is applied to make the system practical.
Agency: Department of Defense | Branch: Navy | Program: STTR | Phase: Phase II | Award Amount: 333.23K | Year: 2013
We propose to build an emitter localization and detection system that can geolocate signals in the 800-2400 MHz range. The system can be rapidly-deployed, provide accurate emitter locations, deals with many-emitter problem explicitly, and can find low-power emitters.
Coherent Navigation, Inc. | Date: 2010-09-23
A method of countering GNSS signal spoofing includes monitoring a plurality of GNSS signals received from a plurality of GNSS signal sources and comparing broadcast data to identify outlying data, which is excluded from generation of a navigation solution defined by the plurality of GNSS signals. The outlying data can be a vestigial signal from a code or carrier Doppler shift frequency. The method includes triggering a spoofing indicator upon identification of the outlying data or other phenomenon. The phenomenon can include a shift in a phase of a measured GNSS navigation data bit sequence or a profile phenomenon of a correlation function resulting from correlation of the incoming GNSS signals with a local signal replica. The profile phenomenon can be the presence of multiple sustained correlation peaks. A nullifying signal can be generated and superimposed over a compromised signal.
Coherent Navigation, Inc. | Date: 2010-09-23
A method for upgrading GNSS equipment to improve position, velocity and time (PVT) accuracy, increase PVT robustness in weak-signal or jammed environments and protect against counterfeit GNSS signals (spoofing). A GNSS Assimilator couples to an RF input of existing GNSS equipment, e.g., a GPS receiver, and extracts navigation and timing information from available RF signals, including non-GNSS signals, or direct baseband aiding, e.g., from an inertial navigation system, frequency reference, or GNSS user. The Assimilator fuses the diverse navigation and timing information to embed a PVT solution in synthesized GNSS signals provided to a GNSS receiver RF input. The code and carrier phases of the synthesized GNSS signals are aligned with those of actual GNSS signals to appear the same at the target receiver input. The Assimilator protects against spoofing by continuously scanning incoming GNSS signals for signs of spoofing, and mitigating spoofing effects in the synthesized GNSS signals.
Coherent Navigation, Inc. | Date: 2014-04-03
A system and method of continuous carrier wave reconstruction includes a radio navigation receiver that includes one or more processors, memory coupled to the one or more processors, and an input for receiving a signal from a transmitter. The signal has a phase. The one or more processors are configured to obtain phase lock on the received signal, extract first phase information from the received signal, detect a loss in phase lock on the received signal, and extrapolate second phase information while phase lock is lost using a model of the phase. In some embodiments, the one or more processors are further configured to reconstruct the carrier signal based on the first and second phase information. In some embodiments, the one or more processors are further configured to scale the first and second phase information from a first nominal frequency of the received signal to a different second nominal frequency.
Coherent Navigation, Inc. | Date: 2014-02-24
A navigation system includes a navigation radio and a sensor onboard a vehicle. The navigation radio receives and processes low earth orbit RF signals to derive range observables for a corresponding LEO satellite. A sensor is operable to generate at least one of vehicle speed data, acceleration data, angular rate data and rotational angle data under high vehicle dynamics. The navigation radio includes a navigation code operable to obtain a position, velocity and time solution (a navigation solution) based on the one or more range observables, ephemerides for the corresponding LEO satellite, a heading pseudomeasurement, a navigation radio altitude pseudomeasurement; one or more vehicle velocity pseudomeasurements orthogonal to the altitude pseudomeasurements; and the generated at least one of vehicle speed data, acceleration data, angular rate data and rotational angle data. The navigation radio uses the navigation solution to acquire a GPS signal during interference with a coarse acquisition GPS signal.
Agency: Department of Homeland Security | Branch: | Program: SBIR | Phase: Phase II | Award Amount: 140.05K | Year: 2014
Our Phase II effort in response to DHS SBIR Topic H-SB013.1-004 we propose to investigate the development of a next-generation, ground- and air-based, tiered, inexpensive, low-power, high-performance GPS emitter detection and localization system. The system will provide high-accuracy (high-sensitivity), real-time or near-real-time estimates of position, velocity, transmit frequency, and transmit power level of multiple, moving, low-power (10 mW) emitters in the GPS L bands (L1, L2, and L5). It will work in conjunction with deployed GPS equipment and possibly Govt-issue smartphones to provide additional measurements of GPS emitters.. The system will quickly and accurately detect and localize GPS threats to critical infrastructure, including jamming, spoofing, advanced adaptive and cognitive threats, and natural threats such as solar radio bursts and scintillations. The tiered system consists of ground- and air-based sensor nodes, deployed GPS equipment, smartphones, and a centralized processing capability. The new sensors will use TDOA/FDOA and angle-of-arrival technology to precisely localize GPS jammers and spoofers, including less precise but higher density smartphone data. The specific product to be developed is a GPS emitter detection and localization system that can be deployed locally or over a region. The product will be available to DHS, FAA, FCC and many DoD and IC agencies. Commercial value is in transitioning the technology into the GPS test and simulation markets. A smartphone- and web-based service will report GPS outages and events. Today, the TRL is 3 and we expect it to be TRL 5 or 6 by the end of the Phase-II contract.
Agency: Department of Homeland Security | Branch: | Program: SBIR | Phase: Phase I | Award Amount: 99.99K | Year: 2013
In response to DHS SBIR Topic H-SB013.1-004 we propose to investigate the development of a next-generation, tiered, inexpensive, light-weight, low-power, high-performance GPS emitter detection and localization system. The system will provide high-accuracy (high-sensitivity), real-time or near-real-time estimates of position, velocity, transmit frequency, and transmit power level of multiple, moving, low-power emitters in the GPS L bands (L1, L2, and L5). It will work with existing deployed GPS equipment. Reporting of events will make use of existing technology, if applicable. At the end of Phase I, we plan to have a solid understand of GPS vulnerabilities understanding of GPS dependencies and vulnerabilities in the Energy, Communications, and Transportation Sectors and a prototype design for a GPS emitter detection, localization, and reporting system for these three sectors. At the end of Phase II, we anticipate having a much deeper understanding of GPS dependencies and vulnerabilities in these sector plus the Emergency Services Sector. We plan to deploy a prototype GPS emitter detection, localization, and reporting system. We also plan to carry out a demonstration of the capability at NAVFEST or a suitable test environment. Today, the TRL is 3 and we expect it to be TRL 5 or 6 by the end of the Phase-II contract.
Agency: Department of Defense | Branch: Army | Program: SBIR | Phase: Phase I | Award Amount: 99.84K | Year: 2014
We propose a software-defined radio solution that consists of a GNSS chip and signals of opportunity. Our solution uses satellite and other terrestrial signals of opportunity to improve the anti-jam, anti-spoof, and indoor positioning performance of a receiver. Our Phase-III goal is a handheld portable and optional integrated transmitter.
Agency: Department of Defense | Branch: Navy | Program: SBIR | Phase: Phase I | Award Amount: 79.92K | Year: 2014
We propose to develop a SAASM ultra-tightly-coupled GPS/INS system that provides 75 dB of AJ during track and greater than 60 dB of AJ during acquisition. The system relies on existing SAASM boards coupled with navigation software developed by Coherent Navigation. Our system is designed for UAVs and other airborne platforms.