R&D Contracting Directorate, Wright-Patterson AFB OH 45433-7607

A -- GPS ANTI-JAM FILTER TECHNOLOGY PROGRAM THIS ANNOUNCEMENT IS IN TWO PARTS. THIS IS PART 1 OF 2 SOL PRDA 95-15-AAK DUE 083195 POC Contact Ardra Morgan, Contract Negotiator, (513) 255-6908. A--INTRODUCTION: GPS Anti-jam Filter Technology Program PRDA#95-15-AAK. This is a Program Research and Development Announcement (PRDA). The Wright Laboratory (WL/AAKR) is interested in receiving proposals (technical and cost) on the research effort described below. This effort will be jointly sponsored by both Wright Laboratory and the GPS Joint Program Office (JPO). Proposals in response to this PRDA shall be submitted by 31 Aug 95, 1500 hours Eastern Daylight Time, addressed to: Wright Laboratory, Directorate of R&D Contracting, ATTN: Ms. Ardra Morgan, WL/AAKR, Bldg 7, Area B, 2530 C St., WPAFB OH 45433-7607. This is an unrestricted solicitation. Small businesses are encouraged to propose on all or any part of this solicitation. Proposals submitted shall be in accordance with this announcement. Proposal receipt after the cutoff date and time specified herein shall be treated in accordance with restrictions of FAR 52.215-10. A copy of this provision may be obtained from the contracting point of contact. There will be no other solicitation issued in regard to this requirement. Offerors should be alert for any PRDA amendments that may be published. Offerors should request a copy of the WL Guide entitled ''PRDA and BAA Guide for Industry.''. This guide was specifically designed to assist offerors in understanding the PRDA/BAA proposal process. Copies may be requested from WL/AAKR, ATTN: Ardra Morgan, WPAFB OH 45433-7607, 513-255-6908/5311 (FAX: 513-255-3985). B--REQUIREMENTS: (1) BACKGROUND: The NAVSTAR Global Positioning System (GPS) provides military users high accuracy position, velocity, and time (PVT) world-wide. GPS as a force enhancer was demonstrated during Desert Storm and has since gained much attention by the war fighting community and the higher levels of DoD. This has strengthened the DoD's commitment to equipping weapon systems with GPS receivers. Along with this enormous commitment and the high level attention that GPS is receiving, is the heightened awareness of the potential vulnerabilities of GPS signal reception to intentional and unintentional RF interference. Over the past fifteen years there has been development, pre-production, and production work in the area of Electronic Counter Counter Measures (ECCM) for GPS receivers. One such ECCM filter approach that is fielded today is the null-steering Controlled Reception Pattern Antenna (CRPA) and Antenna Electronics (AE). This spatial filter set was developed with consideration to the potential threat, implementation limitations, GPS signal reception, and cost. It was developed by the Air Force's Avionics Laboratory and subsequently fielded by the GPS Joint Program Office (JPO) using late 1970's component technology. This system is flying on many of the Air Force's aircraft today, but its fielded system level performance is just now being thoroughly investigated. Future limitations of this fielded spatial filter set can be attributed to component, device and technology limitations as well as the increasing potential jamming threat. It is expected that the numbers of potential military and commercial RF communication/data signal interferers will increase along with more and new jamming threats that will likely be fielded in response to the U.S. fielding numerous GPS equipped weapon systems. (2) SCOPE: The objective of this effort is to identify, evaluate, develop, demonstrate, and deliver innovative GPS anti-jam (AJ) filter(s) that are effective against intentional and unintentional interference to GPS User Equipment (UE), with emphasis on multiple broadband Gaussian noise interferers. An anti-jam filter brassboard shall be built and tested to demonstrate higher, yet affordable AJ capabilities for GPS UE on aircraft and other airborne weapon systems beyond the year 2000. There are three phases for this program: Phase I will consist of system requirements and definition, Phase II will entail preliminary and critical design work, and Phase III will involve fabrication, assembly, integration, and testing. (3) SPECIFIC REQUIREMENTS: The filter shall be capable of suppressing a mix of interferer types, with the emphasis on multiple broadband Gaussian noise interferers (bandwidth from 100 KHz to 100 MHz). The filter shall also provide suppression capabilities against other types of interferers, including continuous wave (CW), swept CW, pulsed CW, amplitude modulated (AM) CW, phase shift keying (PSK) pseudonoise signal (20 MHz bandwidth), and narrowband and wideband frequency modulated signals. The interferers may be located anywhere within or adjacent to the 20.46 MHz bandwidths centered at the GPS L1 frequency (1575.42 MHz) or L2 frequency (1227.60 MHz). The filter shall operate in an interference environment containing at least 4 interfering sources and as many as 20 interferers with different power levels (up to 20 dB maximum to minimum power differential). The total interference power-to-signal power ratio that the filter may be subjected to from all sources is 100 - 120 dB, where the signal power is in the range from -166 dBWw minimum to -150 dBWw maximum. The interferers may be distributed anywhere over 2 pi steradians of solid angle centered at zenith relative to the local horizontal plane of a GPS receiving antenna. In addition to providing interference suppression, the filter shall allow reception of GPS satellite signals in a stressed environment by maximizing the signal power-to-interference plus noise power ratio for acquisition and tracking of the GPS signal by standard military P(Y) code UE, like RCVR 3A and Miniature Airborne GPS Receiver (MAGR). The filter shall be targeted for operation within the environment and dynamics characteristics of high performance fighter/attack aircraft, like the F-14, F-15, F-16, and F/A-18. The contractor shall evaluate the filter integration configurations which are appropriate for the proposed filter, including: (a) Embedded within UE, like RCVR 3A, MAGR, and the proposed GPS Receiver Applications Module (GRAM), and tightly coupled GPS receivers like Embedded GPS/INS (EGI), (b) Electronics (for a spatial filter, for example) integrated with the aperture, (c) Separate Line Replaceable Unit (LRU) or Shop Replaceable Unit (SRU). For any approach, the total volume required by the filter electronics should be minimized using advanced integrated circuit and packaging technologies, such as Application Specific Integrated Circuits (ASICs) and Multi-Chip Modules (MCMs). Regardless of the integration approach, the filter shall be capable of being interfaced with both RF-input (L1 and L2) and IF-input (173.91 MHz) GPS receivers. External host platform data (e.g., attitude or aiding data) or GPS receiver supplied data required by the filter shall be identified. Small size and low primary power requirements are highly desirable filter features which will permit its use with small, low power GPS receivers and on a greater number of platform types, particularly Precision Guided Munitions (PGMs). It is desirable that the filter technology allow for low unit production costs to permit its adaptation to and integration with cost-sensitive weapons systems and permit initial filter production and installation to start in CY2000 - CY2003. If a spatial filter (antenna and antenna electronics) is proposed, the following additional considerations apply. The spatial filter set will obtain null convergence times of less than 3 milliseconds for at least a mix of four jammers with a minimum differential between power levels of 20 dB. Other issues to be addressed for spatial filter design trade-off studies include: (a) Pattern forming from a system level perspective which would include null steering and beam steering/gain maintenance versus satellite directive gain loss, (b) Both null and/or beam steering with different numbers of antenna elements with respect to airframe installation and cost, (c) A typical auxiliary element designs that may provide enhanced performance, (d) Considerations for the antenna electronics include: (1) maximum complementary performance of any adaptive temporal or spectral filters with the spatial filter, (2) maximizing the use of digital electronics and reducing the amount of analog electronics, and (3) a flexible/modular architecture that is reconfigurable for the number of channels corresponding to different antenna array types and adaptable to various input/output interfaces for different GPS receiver types. During Phase I, the systems requirements and definition phase, proposed filter architecture(s) shall be evaluated with respect to overall GPS navigation performance. Specifically, simulation, analysis, existing hardware/software prototypes, etc. can be used to evaluate proposed filter performance against interference scenarios. This evaluation shall consider acquisition and tracking performance impacts on GPS UE, using the MAGR and EGI type receiver for baseline GPS receiver performance and interfaces. Trade-off studies shall be performed, as appropriate, for hardware, software/firmware, algorithm, technology insertion, ASIC, packaging, etc approaches. Enhancing technologies required for the filter shall be identified and an approach for their development/insertion shall be presented. Filter interface/integration approaches with GPS receivers identified above shall be evaluated. Practical consideration shall be given to airframe implementation costs and installation issues. Phase I shall culminate with the preparation of: (a) An interim technical report describing: 1) trade-offs and approaches for filter implementation, expected GPS receiver acquisition, tracking, and navigation performance with the proposed filter, and filter installation/integration issues, 2) program plan and schedule for Phase II and Phase III activities; (b) System/segment specification defining the filter's performance, interface, environmental, and test requirements. Phase I deliverables shall be submitted 6 months after contract award. Air Force approval shall be required at the end of Phase I to permit the contractor to continue on to Phase II. During Phase II, the preliminary and critical brassboard design implementing the selected filter architecture shall be performed. This phase shall culminate with the preparation (as appropriate for the filter design) of critical design information (e.g. filter schematics and layout diagrams, ASIC design files, packaging layouts, software design document, etc.) The software language Ada shall be used to the maximum extent possible. Air Force approval shall be required at the end of Phase II (completion of a successful Critical Design Review) to permit the contractor to continue on to Phase III. In Phase III, fabrication, assembly, integration, and testing of a limited flight-worthy filter brassboard shall be performed. The brassboard shall be integrated/interfaced with a P(Y)-code GPS receiver. The integrated brassboard shall be tested in accordance with Government-approved test plans and procedures, using contractor and/or Government laboratory and, if applicable, outdoor range facilities. Government testing may be performed at Wright Laboratory, WPAFB OH and/or Holloman AFB NM. Flight tests of the brassboard may be conducted at Holloman AFB, as an option to the baseline program. (4) DATA AND DELIVERABLE ITEMS: The following deliverable items will be required, (/T means tailored to contractor's format): (a) Conference Agenda, DI-ADMIN-81249/T, (10 times), (b) Conference Minutes, DI-ADMIN-81250/T (10 times), (c) Scientific and Technical Reports (Final Report), DI-MISC-80711/T (draft and reproducible final), (d) Funds and Man-Hour Expenditure Report, DI-FNCL-80331, monthly, (e) Scientific and Technical Reports, (Contractor's Billing Voucher), DI-MISC-80711/T, monthly, (f) Presentation Material, DI-A-3024A/T (for program reviews, charts/photos as required), (g) Scientific and Technical Reports (Interim Report for Phase I), DI-MISC-80711/T, (h) Test Plans/Procedures, DI-NDTI-80808/T, (i) Status Report, DI-MGMT-80368, monthly, (j) Contract Funds Status Report (CFSR), DI-F-6004B, quarterly, (k) Data Accession List/Internal Data, DI-A-3027A/T, semiannually, (l) Computer Software Product End Items, DI-MCCR-80700, (m) System/Segment Specification, DI-CMAN-80008A, (n) Software Design Document, DI-MCCR-80012A/T, and (o) Anti-jam filter demonstration brassboard(s). The contractor shall plan, prepare for, and present ten program reviews at 3-4 month intervals throughout the program. The Kickoff Meeting, Preliminary Design Review, and Final Review will be held at Wright-Patterson AFB while the System Requirements/Design Review and Critical Design Reviews will be held at Los Angeles AFB. All other meetings will be equally spaced and may be held at either the offeror's or their subcontractor's facilities. A draft of the Final Report shall be submitted within 30 days of the completion of the technical effort. The Final Report shall be submitted within five months of the end of the technical effort. (0195)

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