NASA Langley Research Center, Industry Assistance Office, MS 144 Hampton, Va. 23681-0001

58 -- DESIGN, FABRICATION AND DELIVERY OF MILLIMETER WAVE DOLLPER RADAR POC Linda Fitzgerald, Industry Assistance Office, (804) 864-2461. In order that potential participants may learn of the interest in a specific requirement, an advanced notice is published here. Langley Research Center is hereby soliciting information for potential sources to design, fabricate and deliver a millimeter wave Doppler radar designed to detect small scale atmospheric structures in fog and rain for the purpose of detecting and tracking aircraft wake vortices. The following requirements might be adjusted to accommodate the use of commercial products that would require minimal modification. In general, performance beyond that described here is of interest in the areas of versatility, resolution, and sensitivity. The 35 to 44GHz coherent radar shall have a system noise temperature (including antenna) of less than or equal to 1500K, and AGC and I&Q outputs. A parabolic antenna system with an EL/AZ positioner is required. The positioner shall be capable of a scan rate of 12/sec, with a faster slew rate desired. A positioner step resolution of 0.1 is desired. The required range resolution of 5m may be achieved by means of a short pulse or pulse compression, and a switchable pulse-width is desired. Crossrange resolution of 7.5m or better out to a range of 1km is required. The radar minimum range shall be 250m, and a maximum range capability of 3km is desired. Switchable PRF is required with capability in the range from 24KHz to 50KHz required and additional lower rates desired. The radar should be capable of a 0dB signal to noise plus ground clutter ratio for -40dBz reflectivity within a range cell at up to 1.5km range or further. The antenna is expected to be used in the near field, and antenna performance is an important issue, since ground clutter will be a major factor in system capability. Therefore the suppression of spillover, feed leakage, and far-out sidelobes is critical. Calibration, self-test, and diagnostic capabilities for the radar system are of interest. The system should provide a digital control/data system interface with outputs for antenna position and radar setup parameters. A programmable, user-friendly controller subsystem (with source code provided) is desirable. The system will be portable and is expected to be operated in fixed locations for extended periods in a variety of weather. Vendors may respond with information on the RT unit, antenna, and antenna positioner as a unit or separately. The availability of commercial products that would require minimal modification and vendor interest and capability for full-system versus subsystem delivery will be factors in the final system design and sensor requirements. Firms having the capabilities necessary to meet the above requirement are invited to submit appropriate documentation, literature, brochures, and references to demonstrate and support that they have the necessary experience and resources to meet the above requirement. This synopsis is for information and planning purposes and is not to be construed as a commitment by the Government nor will the Government pay for information solicited. Respondents will not be notified of the results of the evaluation. Respondents deemed fully qualified will be considered in any resulting solicitation for the requirement. Firms responding should indicate whether they are a socially or economically disadvantaged business firm, an 8(a) firm or a small business, and/or woman-owned business. The Government reserves the right to consider a small business or an 8(a) set-aside based on responses hereto. Expressions of interest should be directed to Dr. Robert Neece (804) 864-1827. Closing date for submission of responses is 30 days from date of publication. In responding reference SS254. See Note ''A''. (0065)

Loren Data Corp. http://www.ld.com (SYN# 0336 19960306\58-0007.SOL)