SITIS Archives - Topic Details
Program:  SBIR
Topic Num:  AF071-226 (AirForce)
Title:  Digital Antijam (AJ) Processing Application-Specific Integrated Circuits (ASIC) for Hand-held Global Positioning Satellite (GPS) Receiver
Research & Technical Areas:  Information Systems, Electronics

 The technology within this topic is restricted under the International Traffic in Arms Regulation (ITAR), which controls the export and import of defense-related material and services. Offerors must disclose any proposed use of foreign nationals, their country of origin, and what tasks each would accomplish in the statement of work in accordance with section 3.5.b.(7) of the solicitation.
  STATEMENT OF INTENT: Design advanced ASIC for GPS handhelds, a very high priority for this PEO
  Objective:  Design, develop, fabricate, and test a low-power ASIC implementing digital AJ processing for GPS hand-held receivers.
  Description:  Over the last several years, AJ technology for GPS user equipment (UE) has evolved from analog processing to more robust digital signal processing techniques like space time adaptive processing (STAP) and space frequency adaptive processing (SFAP). As a result of the significant size, power, and cost constraints associated with GPS hand-held receivers, these AJ enhancements have primarily been directed to avionics and vehicular GPS receivers. While externally mounted AJ accessories have been developed to supplement the limited inherent AJ capabilities of military hand-held receivers like PLGR and DAGR, there are significant issues with their operational viability for dismounted applications. An AJ solution for hand-helds that is both fully integrated with the hand-held unit and transparent to the user is required to meet the Navwar requirements for the dismounted soldier. What is required is to leverage the advances in microelectronics for ASIC and STAP/SFAP algorithm implementation for development of a low-power digital AJ ASIC suitable for integration within a hand-held receiver. This will be one of the technology enablers for a complete integrated AJ solution for hand-held receivers. The capability objectives for the ASIC are as follows: 1. Process at least two (desired four) channels each of L1 and L2 digital data (12 bits desired, 8 bits minimum) at IF and/or baseband with an input data rate and bandwidth compatible with P(Y)-code and M-code signal processing requirements (e.g., 60 to 90 MHz real sampling rate, 24 to 30 MHz bandwidth) 2. Power consumption ¡Ü0.6 watts 3. Size and input power voltage consistent with hand-held receiver designs such as DAGR 4. AJ performance: 1 to 3 broadband noise (depending on number of input channels implemented) and one partial band jammers: ¡Ý25 dB suppression; 1 to 3 broadband noise (depending on number of input channels implemented) and three narrowband jammers: ¡Ý30 dB suppression 5. Environmental requirements compatible with military hand-held receivers like DAGR.

  PHASE I: Perform tradeoff studies, modeling, and simulation, as required, including simulating power, size, cost, AJ performance, and environmental requirements. Develop ASIC requirements and preliminary macro cell design, and perform modeling and simulation to evaluate performance of initial design.
  
  PHASE II: Perform ASIC detailed design and develop VHDL code for ASIC fabrication. Develop test breadboards (FPGAs for example) to evaluate performance of critical/risky circuit features. Perform bit-level simulation of the ASIC to evaluate key performance requirements. Prepare a technical report describing Phase II efforts and final ASIC performance requirements. Provide VHDL code for ASIC fabrication.

  DUAL USE COMMERCIALIZATION: Military application: Will have applications for all GPS Military. Commercial application: Fabricate ASICs based on the design and VHDL code from Phase II. Develop an evaluation board for testing in a simulated jamming and GPS environment. Perform ASIC testing against Phase II requirements

  References:  1. Enhanced Anti-Jam Capability for GPS Receivers: Approved for public release, distribution unlimited R. L. Fante, J. J. Vaccaro ION GPS 1998 Nashville, TN - September 1998 2. Wideband Cancellation of Interference in a GPS Receive Array; Approved for public release, distribution unlimited; R. L. Fante, J. J. Vaccaro; IEEE Transactions on Aerospace and Electronic Systems April 2000 3. Applications of Space Time Adaptive processing, Edited By Klemm, Richard,2004, Published by Knovel Corp 2006 4. All-Digital,Spatial Anti-Jam GPS Receivers: Architecture,Implementation and Initial Performance Results, ION GPS 1999,Session D6, Bradley J. Bazuin, Craig fassler,et al 5. GSTAR SpatialTemporal Adaptive Processing (STAP), Lockheed-Martin,Defense Update International Online Defense Magazine,Year 2004,Issue 5

Keywords:  GPS, hand-held receiver, antijam, STAP, SFAP, ASIC

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