NASA/Goddard Space Flight Center, Code 214.6, Greenbelt, MD 20771

A -- TELECOMMUNICATIONS PAYLOADS DUE 071700 POC Kellie J Murray, Contract Specialist, Phone (301) 286-2271, Fax (301) 286-1709, Email kmurray@pop200.gsfc.nasa.gov -- Kellie J Murray, Contract Specialist, Phone (301) 286-2271, Fax (301) 286-1709, Email kmurray@pop200.gsfc.nasa.gov WEB: Click here for the latest information about this notice, http://nais.msfc.nasa.gov/cgi-bin/EPS/bizops.cgi?gr=D&pin=51#NAS5-9727 1. E-MAIL: Kellie J Murray, kmurray@pop200.gsfc.nasa.gov. NASA Goddard Space Flight Center (GSFC) intends to obtain services from the Johns Hopkins University Applied Physics Laboratory (APL) on a sole-source basis for independent analysis, evaluation, and simulation of the performance of the telecommunications payloads of the Tracking and Data Relay Satellites (TDRSS). These satellites are currently under development by Hughes Space and Communication Co. (HSC) and scheduled to be launched starting in mid 2000. The TDRS satellites will replenish the existing Space Network (SN) constellation of on-orbit TDRS spacecraft, which are rapidly approaching the end of their design life. The TDRSS replenishment program will extend existing SN capabilities into the second decade of the 21st century, and augment the current SN support capabilities with an enhanced multiple access (MA) User service and new single access (SA) Ka-band User services with increased bandwidth, channel capacity, and frequency agility to support significantly higher User data rates. It will alsoprovide inter-operability with the prototype and operational TDRSS spacecraft under development by the European Space Agency (ESA) and the Japanese National Space Development Agency (NASDA). NASA requires independent analysis, evaluation, and simulation of the performance of the TDRSS telecommunications payloads as part of the overall replenishment program. APL has provided independent analysis, evaluations, and simulations of TDRSS telecommunications systems performance since the 1970s time frame associated with the early design, and integration and test of the first TDRS satellites. APL has done analysis and simulations of specialized areas of TDRSS telecommunications (the MA ground implemented phased array system and TDRSS single access antenna autotrack acquisition and track) and has performed independent assessments and critiques of TDRSS performance in the operational SN including special task support of the investigations into MA system operability in the first year of TDRSS orbital operations. APL has specialized expertise in the area of Signal Processing Workstation (SPW) modeling of TDRSS communications of the existing TDRS satellite telecommunications payloads and the modifications to existing undocumented C language macro driven SPW models necessary to accurately model TDRSS system capabilities. Interested organizations may submit their capabilities and qualifications to perform the effort in writing to the identified point of contact not later than 4:30pm local time on 7/17/00. Such capabilities/qualifications will be evaluated solely for the purpose of determining whether or not to conduct this procurement on a competitive basis. A determination by the Government to not compete this proposed effort on a full and open competitive basis, based upon responses to this notice is solely within the discretion of the Government. An Ombudsman has been appointed. See NASA Specific Note "B". See CBDNET Notes 12, 22, 25, and 26 as they apply to this synopsis. Any referenced notes can be viewed at the followingURL: http://genesis.gsfc.nasa.gov/nasanote.html Posted 06/30/00 (D-SN470877). (0182)

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