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A -- GPS SYSTEM LEVEL ARCHITECTURE SOL PRDA 96-34 DUE 060696 POC Technical Contact Point: Major Norah Hill, (310)363-5761; Contracting Officer: Ms CC Coleman, (310)363-6360. This amendment to the original PRDA, published 22 Apr 96, clarifies Section B-REQUIREMENTS and expands Section D-PROPOSAL PREPARATION INSTRUCTIONS. The original proposal submittal date of 6 Jun 96, 1500 PDT, remains unchanged. Section B-REQUIREMENTS, paragraph (1) is changed to read as follows: (1) Technical Description: The purpose of this Evaluation Study is to develop a systems-level solution that will protect the Department of Defense (DoD) and U.S. Allies operational use of GPS during times of conflict, while preventing use of GPS by adversaries with minimal impact on civil use outside of the area of conflict. The Evaluation Study will include an investigation into material and non-material solutions to increase protection for U.S. forces from enemy jamming and spoofing of GPS. Relevant technologies which may be considered are: antenna technologies, adaptive nulling or beamforming techniques, post-correlation beamforming or nullforming techniques, antijam filters, utilization and increase of body maskings effects, or any other technologies or techniques which may prove effective against GPS jamming. Section B-REQUIREMENTS, paragraph 1(b) is changed to read as follows: Establish and maintain a Decision Database (reference : MIL-Std-499B draft dated 5/6/94, para 6.4.5). Section D-PROPOSAL PREPARATION INSTRUCTIONS, paragraph (2)Technical/Management Proposal, subparagraph (f), is changed to read as follows: (f) proposed protection options for U.S. forces from enemy jamming and spoofing of the GPS, ranging from non-material techniques to major retrofit of user equipment, (g) technical and tactical limitations of protection options, (h) implications of prevention techniques on protection requirements and vice-versa, and (i) technologies and techniques that the contractor expects to clarify over the course of the study. (0124)

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