the R&D program, will be determination of its capability for dual polarization measurements. Thorough evaluation of the capability of phased array radar to accurately measure polarization variables independent of scan angle must be carried out early in the R&D program.

Recommendation: Given the high demand for bandwidth at the proposed S-band frequency, the MPAR R&D program must determine the total required bandwidth as early as possible in the research program to ensure the feasibility of the design.

Specific Recommendations on the Costs and Cost-Benefit Considerations

Recommendation: A thorough and complete cost analysis of the total MPAR program should be performed and compared with historical life-cycle costs for the more recently and currently deployed systems such as ARSR-4 and ASR-11 that are roughly equal in performance to MPAR for air-traffic surveillance, and for NEXRAD and TDWR radars that provide a performance baseline versus MPAR for weather surveillance. A detailed baseline operations and maintenance (O&M) cost estimate should be determined for all legacy radar types to identify and quantify those highest cost radar types that are the prime candidates for life extension, upgrade or replacement. Independent cost risk analyses for the acquisition of MPAR and T-MPAR by recognized methods should be performed and frequently re-visited and updated.

Recommendation: An alternative weather-only phased array weather radar design trade study and detailed cost analysis should be performed and compared with historical life cycle costs and performance for NEXRAD and TDWR radars. This trade study and cost analysis should be compared with a more detailed MPAR cost analysis and trade study to determine if the marginal cost of adding the required aircraft surveillance capability is worth the perceived benefit of having an all-in-one system.

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