Armanment Directorate Contracting Division (WL/MNK), Eglin AFB FL 32542-6810

A -- ADVANCED GPS INERTIAL NAVIGATION TECHNOLOGY (AGINT) PART 1 OF 2 SOL PRDA NO. MNK-96-0002 POC Linda Weisz at (904) 882-4294, ext 3206. A--INTRODUCTION: This is a Program Research and Development Announcement (PRDA). PART 1 OF 2. The Wright Laboratory Armament Directorate (WL/MNAG) is interested in receiving proposals (technical, cost, and past performance) on the Advanced GPS Inertial Navigation Technology (AGINT) effort described below which is jointly sponsored by Wright Laboratory and the Global Positioning System (GPS) Joint Program Office (JPO). Proposals in response to this PRDA shall be submitted by 30 January 1996, 3:00 P.M. CT, addressed to Wright Laboratory, Armament Contracting Division, Building 13, 101 W. Eglin Blvd, Suite 337, Eglin AFB FL 32542-6810, Attn: Linda Weisz (WL/MNK). This is an unrestricted solicitation. Small Businesses are encouraged to participate. 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. This PRDA may be amended to allow subsequent submission of proposal dates. Offerors should be alert for any PRDA amendments that may permit subsequent submission of proposal dates. B--REQUIREMENTS: (1) Technical Description: (A) Background: The inception of the DOD funded NAVSTAR GPS (Global Positioning System) dates back to the late sixties and early seventies. The intent of the program was to provide for an all weather, world wide, day or night, high accuracy, navigation and guidance capability for weapon platforms and systems. The general principal upon which the GPS is based is computation of a users position (the GPS receiver position) based on a distance to known points in space (GPS satellite positions). This is accomplished by means of a constellation of GPS satellites that continually transmit low-power spread-spectrum pseudo-random information messages which are then processed by GPS receivers. From the received message, user position and velocity can be calculated. This method provides a navigation precision previously unattainable. Some characteristics Ef the GPS make it particularly susceptible to jamming or spoofing. This is primarily because GPS signals are transmitted by satellites operating at well-known frequencies and well-defined modulation characteristics at low signal-to-noise (SNR) ratios. Consequently, future precision weapons such as the Joint Direct Attack Munitions (JDAM) or the Joint Stand-Off Weapon (JSOW), must have the ability to reject deliberate or inadvertent jamming attempts by enemy sources to defeat the guidance system. GPS has some antijam (AJ) immunity built into the signal structure, however, the modest jamming-to-signal (J/S) performance and long acquisition times associated with conventional GPS receivers are inadequate for the high jamming and high dynamic environments of tactical weapons. Recently, WL/MNAG has begun to address some of the concerns of receiver AJ performance, size, and cost with its Tactical High Antijam GPS Guidance (THAGG) and Tactical GPS Antijam Technology (TGAT) programs. Together these programs were successful in achieving the design and prototype of a lightweight, low power, small circular error probable (CEP) receiver with significant AJ performance within the tactical weapon volume, environment, and cost constraints. These programs provide an excellent base to draw upon for the next generation integrated AJ GPS/Inertial Measurement Unit (IMU) systems. (B) Scope: The Air Force Wright Laboratory Armament Directorate has a need for the development of a reliable, accurate, miniaturized, low cost, high AJ Advanced Tactical Weapon Guidance System (ATWGS) capable of operating in a high dynamic flight environment against a mixture of multi-type GPS jammers. The guidance system shall consist of a miniature antenna array and smart beam/null forming electronics integrated with an all-in-view GPS receiver that is tightly coupled (i.e., single Kalman filter) with a tactical-grade IMU. Incorporation of other core enabling technologies which will enhance system performance are: Wide Area GPS Enhancement (WAGE), receiver autonomous integrity monitoring (RAIM), Enhanced GPS for Combat Systems (EGCS), THAGG, TGAT, dual L1 and L2 utilization with carrier phase smoothing, and direct Y-code acquisition. Additionally, JPO requirements such as the Selective Availability Anti-Spoofing Module (SAASM) and GPS Receiver Applications Module (GRAM) must be included in design parameters. There are three phases for tEis program: Phase I is structured as a 15 month effort consisting of a requirements review (3 mo), breadboard design (6 mo), assembly (3 mo), and characterization testing (3 mo). Phase II (a contractual option for a 30 month effort exerciseable at the discretion of the government) will consist of a brassboard design (1 yr), fabrication and integration (1 yr), and testing (6 mo). Phase III (a second contractual option exerciseable at the discretion of the government) will consist of contractor field maintenance support for internal government testing (6 mo). (C) Requirements: The ATWGS shall consist of a conformal, small, surface mounted GPS weapon antenna, an all-in-view L1/L2 receiver tightly coupled (e.g., single Kalman filter) with a low cost, tactical-grade IMU (1 deg/hr drift rate) with no greater than 3 meters non-static accuracy without differential GPS aiding (i.e., without a datalink) and time-to-first-fix (TTFF) of 15 seconds given an initial GPS time uncertainty of 150 microseconds in a 75 dB interference-to-signal power ratio environment, including direct P(Y)-code acquisition. The ATWGS shall be comprised of a tightly coupled AJ/GPS/IMU navigation system. The maximum permissible power supplied to the ATWGS should be less than 30 watts. The ATWGS shall conform with current design trends including support of instrumentation ports which will allow for detailed component characterization testing and future development. Additionally, the navigation processor shall have at least a 50% spare memory capacity and processing capability for future expansion. The ATWGS shall have the capability of typical tactical weapon communications with a host aircraft for simulation and test purposes. The ATWGS shall be capable of obtaining GPS tracking in a mix of interferer types: continuous wave (CW), swept CW, pulsed CW, amplitude modulated 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 (1575.42 MHz) or L2 (1227.60 MHz) frequencies. The ATWGS shall operate in an interference environment containing as few as 1 and as many as 20 interferers with different power levels (up to 20 dB maximum/minimum power differential). The maximum interference-to-signal power ratio that the ATWGS may be subjected to from all sources Es 120 dB, where the signal power is in the range of -166dBw minimum to -150dBw maximum. The interferers may be distributed at any angle within 4 pi steradians measured from a unit sphere whose center is aligned along the local horizontal plane of the GPS receiving antenna. In addition to providing interference suppression, the ATWGS shall allow reception of GPS satellite signals in a stressed environment by maximizing the signal-to-interference power plus noise power ratio for acquisition and tracking of the GPS signal. The ATWGS shall be targeted for operation within high dynamic environments and characteristics of a tactical weapon system. The total volume and power required by the brassboard ATWGS 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 technologies used to reduce the size of the brassboard ATWGS, the brassboard ATWGS shall have a total volume no larger than 100 cubic inches with a maximum diameter of no more than 5 inches. It is desirable that the brassboard ATWGS technology allow for low unit production costs ($12K) to permit its adaptation and integration with cost-sensitive weapons systems. If WAGE corrected data is to be utilized in the GPS receiver, the receiver should have the capability of directly accepting the WAGE-corrected ephemeris/clock data (via the host vehicle) and the capability of extracting the WAGE corrections from the satellite vehicle messages directly. The modes should be selectable. If a spatial filter (antenna and antenna electronics) is proposed for the ATWGS, the following additional considerations apply. The spatial filter set will obtain null convergence times of less than 1 milliseconds for a mix of a minimum of four jammers with differential power levels of at least 20 dB. Other issues to be addressed for spatial filter design trade-off studies include: 1) Pattern forming from a system level perspective which would include null steering and beam steering/gain maintenance versus satellite directive gain loss, 2) Both null and/or beam steering with different numbers of antenna elements with respect to airframe installation and cost, 3) A typical auxiliary element design that may provide enhanced performance, 4) Considerations for the antenna electronics include: a) maximum complementary performance of aEy adaptive temporal or spectral filters with the spatial filter, and b) maximizing the use of digital electronics and reducing the amount of analog electronics. SEE PART 2 OF 2. (0335)

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