Defense Nuclear Agency, 6801 Telegraph Rd., Alexandria, VA, 22310- 3398

A -- HF/VHF SYSTEMS PERFORMANCE IN NUCLEAR AND NATURAL DISTURBED ENVIRONMENTS SOL DNA001-96-R-0039 POC Brian Wilt, Negotiator, (703) 325-6960, Scott Morton, Contracting Officer (703) 325-1200. The Defense Nuclear Agency (DNA) is seeking technical support in the performance of a thorough review of all DOD models of nuclear and natural disturbed environments that allow evaluation of HF/VHF systems performance and mitigation of adverse effects on performance. A comprehensive and upgraded model shall be developed which is relevant to the current operational concepts and requirements for HF/VHF systems of DOD. Focusing on DNA small structure global model, WBMOD for bottomside ionosphere, that predicts Spread Doppler Clutter (SDC) for over-the horizon radar (OTHR) and HF propagation through the oblique paths, the upgraded model shall be validated. Existing data from HF channel probe campaigns (of natural disturbed ionosphere) in the equatorial and mid-latitude regions shall be used for the validation. Further validation of nuclear environment effects on HF/VHF propagation model shall be provided by available ionspheric disturbance taped data of the FISHBOWL series of atmospheric nuclear tests. A technical database shall be provided for potential development of enhanced remote OTHR monitoring techniques for detection and tracking of low flying penetrators, small targets, or cruise missiles. A validated SDC environment model for the equatorial geometry shall be developed to analyze the performance of a new OTHR to be installed in Puerto Rico in July 1997 for counter drug operation by SOUTHCOM. All contractor personnel will require a DOD security clearance of SECRET. Note that this procurement is a Total Small Business Set-Aside with SIC Code 8731. Offerors must provide address information to the contract negotiator in order to be included on the mailing list for the solicitation. Address information must be in writing. Faxes are acceptable to the attention of Brian Wilt/AMB at fax number (703) 325-9295. Information on DNA solicitations, already released, can be obtained by calling the DNA Hotline at (703) 325-1173. Reference Synopsis No. 96-66 (0144)

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