Electronic Systems Center, Operational Contracting Division, Services and Repairs Branch, PKOP, Hanscom AFB, MA 01731-1806

J -- MAINTENANCE AND UPGRADE SERVICES FOR THE GRAVITY GRADIOMETER SURVEY SYSTEM (GGSS) SOL F19650-95-R0080 DUE 060195 POC TSgt James C. Bradley, Contracting Specialist, 617-377-3362, FAX 617-377-4324; Glendon A. Hatton, Contracting Officer, 617-377-. Sources are sought for services to repair, refurbish, and maintain the Gravity Gradiometer Survey System (GGSS). The GGSS is a unique, one-of-a-kind, mobile gravity surveying system developed for the Defense Mapping Agency and the Air Force Phillips Laboratory by Bell Aerospace Textron Corporation to perform air and ground surveys. The GGSS has remained largely unused for the last five years. The intent of this contract is to support a minimal overhaul of the GGSS and to provide support and post-mission processing for subsequent ground survey operations. The overhaul shall include but is not limited to: replacement of the Uninterruptible Power Supply (UPS), removal of the current single antenna GPS receiver and replacement with an Ashtech 4 antenna, 3DF GPS Attitude Control Unit (ACU) or equivalent, integration of the output data from the antenna and the ACU into the GGSS data reduction process, a mechancial tune-up including but not limited to the engine, safety equipment, and overall inspection of the vehicle to ensure roadworthiness, removal and cleaning of the fuel tanks, cleaning and purging of the fuel lines, replacement of the two existing air conditioning units, removal of the Air Force Gravity Gradient Instruments (GGIs) and replacement with Government Supplied Advanced Development Model GGIs (security clearances will be required to work with the GGIs and for all subsequent data processing), modification of the GGSS Isolation Platform to improve the performance of ground operations by increasing damping and moving the isolator resonance frequency away from that of the vehicle suspension. In addition, the contract will require the contractor to perform testing and calibration to assure proper functionality of the GGSS to include but not limited to: GGSS System verification through actual data collection and mission post processing and analysis, self gradient calibrations of the system using data collected at a number of azimuth, pitch angle, and roll angle combinations. Road tests of the GGSS will be performed to demonstrate full tensor gradient operation. All post-processed full tensor gradient and location data will be provided to the Air Force, in a mutually agreed digital form following each road test and survey. The approximate issue/response date will be 1 Jun 95. No telephone requests. Only written or faxed requests received directly from the requestor are acceptable. See Numbered Note(s): 22. (0094)

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