Toyon Research Corp. | Date: 2011-08-12
A radio-based navigation system uses a small multi-mode direction-finding antenna and a direction-finding receiver to determine platform position, velocity, attitude and time while simultaneously providing protection against narrowband and broadband sources of interference. Global Navigation Satellite System (GNSS) signals such as those from a Global Positioning System (GPS) provide attitude measurements with a compact multi-mode direction-finding antenna (e.g., a small two-arm spiral with improved angle-of-arrival performance over the entire hemisphere enhanced through use of a conductive vertical extension of the antenna ground plane about the antenna perimeter and/or conductive posts placed evenly around the antenna perimeter) that provides protection against jammers. The multi-mode spiral may be treated as an array of rotationally-symmetric antenna elements. The GPS receiver architecture may be modified for direction-finding and thereby attitude determination by increasing the number of input signals from one to at least two while minimizing the required number of correlators and mixers.
Agency: Department of Defense | Branch: Air Force | Program: SBIR | Phase: Phase II | Award Amount: 750.00K | Year: 2016
ABSTRACT:Toyon proposes to develop a power-aware high-integrity navigation system for size, weight, and power constrained platforms, which provides improved electronic protection against broadband and narrowband jammers, as well as repeaters, spoofers, and multipath using a small-aperture antenna. Power-saving design changes are proposed to all aspects of the system, including the radio-frequency (RF) front-end, analog-to-digital conversion (ADC), anti-jam (AJ) GPS processing, correlation processing, and navigation processing. All changes are compatible with the Selective Availability Anti-Spoof Module (SAASM) and future Common GPS Module (CGM) processing. The navigation performance of the system is enhanced through new electronic support capabilities that include direction finding (DF), attitude determination, and jammer geolocalization. Anti-jam processing requirements are reduced by as much a 95%, depending on the specific circumstances. The highly integrated system design provides an ultra-tightly coupled (UTC) GPS/IMU architecture with the IMU and antenna having a common center-of-mass, thereby reducing lever-arm errors, and carrier-phase distortions are minimized through novel processing techniques. In addition, variable dynamic range algorithms reduce power consumption by matching the system dynamic range to the jammer signal power, thereby making the proposed Power-Aware Miniature Attitude-determining Anti-jam GPS/INS (MAAGI) system highly attractive for small platforms with severe size, weight and power (SWAP) constrains.BENEFIT:The Power-Aware Miniature Attitude-determining Anti-jam GPS/INS (MAAGI) system has the potential to revolutionize anti-jam GPS systems for C-SWAP-constrained systems in both civilian and military applications. The scalable design will permit the same architecture to serve diverse classes of platforms, thereby increasing the system utility and sales, and therefore reducing its cost. Furthermore, ultra-tightly coupled (UTC) GPS/INS systems have the ability to improve the anti-jam GPS performance of platforms whether or not they are capable of supporting large antenna arrays or have severe cost and power constraints.
Agency: Department of Defense | Branch: Army | Program: SBIR | Phase: Phase II | Award Amount: 499.99K | Year: 2015
Toyon Research Corporation proposes a Phase II SBIR project for development and delivery of a complete prototype system which performs 3D tracking and fluorescence measurement for transgenic zebrafish. The developed prototype will include both commercial off-the-shelf (COTS) hardware selected to optimize the collection of zebrafish fluorescence measurements, and advanced algorithms for stereo fluorescence video processing. The proposed algorithms include stereo sensor calibration enabling accurate 3D tracking, fluorescence clutter suppression enabling accurate measurement of dim fluorescence signals, and 3D tracking in a track-before-detect framework for near-optimal tracking of multiple fish in dim fluorescence video. In Phase II, the developed algorithms will be implemented in C++/CUDA software for efficient processing using a commercial off-the-shelf desktop or laptop computer. During Phase II, Toyon will deliver the complete prototype to the Army and support Army personnel in using the developed system. Toyon will also pursue other government transition and commercialization opportunities for the developed technology.
Agency: Department of Defense | Branch: Air Force | Program: SBIR | Phase: Phase II | Award Amount: 749.78K | Year: 2015
ABSTRACT: In the Phase-I program, Toyon explored the capability of antenna arrays to perform direction finding (DF) of jammers in the Global Navigation Satellite System (GNSS) band (1.1-1.6 GHz). Antennas included controlled radiation pattern antennas (CRPAs) consisting of four to seven elements, plus a distributed aperture array with four asymmetrically arranged elements. The distributed array provided the best accuracy because it provides the largest effective aperture. The proposed Phase-II effort will design, build, test, and deliver distributed aperture arrays with up to 12 GNSS-band elements, off-the-shelf 12-channel digital receivers covering the GPS L1 and L2 bands, and a data processing/display/user-interface system to DF one or more jammers and to display and track the jammer location through a Windows based GUI. The array and receiver system will be suitable for testing on a UAV or ground vehicle. The system will be tested in Toyons anechoic chamber, but will ultimately be field tested at Government sites such as White Sands Missile Range. We also plan to test CRPA antennas from Phase I, since they will be plug compatible with our receiver and processing system and may be useful themselves as anti-jam GPS antennas in conjunction with jammer-location platforms. BENEFIT: Toyons approach to this SBIR focuses on developing a distributed aperture array, an accompanying set of receiver and signal processing electronics, and a user friendly GUI to display the estimated jammer locations. Toyons distributed aperture array has the potential to provide geolocation estimation accuracies that are higher quality compared to if a conventional CRPA were used. Toyons multi-channel electronics system is compatible with both distributed aperture arrays and conventional CRPAs. Toyons plan to also experiment with conventional off-the-shelf CRPAs will allow for high levels of flexibility in the development of a GPS jammer geolocating tool.
Agency: Department of Defense | Branch: Army | Program: STTR | Phase: Phase I | Award Amount: 150.00K | Year: 2015
Assured position, navigation and time (PNT) require constant vigilance against intentional and unintentional sources of coherent and non-coherent interference. The Global Positioning System (GPS) is especially vulnerable to attacks and must be defended through electronic protection (EP) measures such as anti-jam (AJ) and anti-spoof (AS). The proposed effort will design and demonstrate GPS-based attitude (GPS/A) determination algorithms in conjunction with algorithms for direction-finding (DF), anti-jam, spoof detection and mitigation, and demonstrate those algorithms with real-time embedded hardware. At the conclusion of the Phase I effort Toyon will demonstrate the DF/AJ/AS and GPS/A performance of a brassboard system under the presence of both coherent and non-coherent sources of interference with minimal phase distortions to the received GPS signal. The demonstration results will be used to design a prototype system that will be developed, fabricated, and demonstrated under operational conditions during the Phase II effort.