NCCOSC RDTE Division, Code D214B, 53570 Silvergate Avenue, Bldg. A33, San Diego, CA 92152-5113

58 -- NAVSTAR GPS SATELLITE CONSTELLATION SIMULATOR SOL N66001-97-R-0063 POC Contract Specialist, Ms. Jennifer Townsend, Code D213, (619)553-5199. Contracting Officer, Ms. Charmaine Joworski, (619)553-4536. POC for copy, Mr. J.C. Norris, (619)553-4331. This modification corrects synopsis #079268 appearing June 2, 1997. The description should read as follows: The Naval Command, Control and Ocean Surveillance Center Research, Development, Test, and Evaluation Division (NRaD) intends to negotiate a firm fixed price, sole source contract in accordance with FAR Part 12 with Interstate Electronics Corporation of Anaheim, CA for the following commercial off-the-shelf item: * Model SCS 2400 NAVSTAR GPS Satellite Constellation Simulator which combines the differential capability, Wide Area Augmentation System (WAAS), Local Area Augmentation (LAAS) capability, Receiver Autonomous Integrity Monitoring (RAIM), attitude determination capability, 12 Satellite vehicles to be able to combine the GPS, WAAS, LAAS, RAIM signals, and be SA-AS capable on both LI/L2 GPS frequencies. This system will allow for complete simulation of all possible satellite combinations in a classified and unclassified constellation. It will include the capability to test differential GPS receivers, all-in-view GPS receivers and it will have the capability to test very precise carrier phase GPS receivers. It will include software drivers to allow for existing NRaD derived simulation software to externally drive the simulator. The system will be fully configured and factory integrated. The above item must be able to interface with the existing systems at NRaD. The NRaD system is composed of real-time control software which is hosted on a VAX 4000 computer system. The real-time control software communicates with a 486 processor personal computer (PC) over an ethernet net link. The PC controls the satellite signal generators to simulate the required RF signals. The real-time software also communicates with various PCs via an ethernet link which are used to simulate different receiver interfaces. The Simulator must be capable of generating very precise carrier/code phase signals, 12 full L1/L2 GPS Y-code signals, combination L1/L2 GPS signals, WAAS, LAAS, RAIM capability, attitude determination to the centimeter range, update rates of at least 250 Hz from an external source (PC) with the update rate fully deselectable down to 10 Hz for some existing projects at NRaD. The solicitation document will be issued approximately on 17 July 1997. For copies of the solicitation, only written requests will be honored. Facsimile letters are acceptable at (619)553-6976. See Numbered Note(s): 22. (0181)

Loren Data Corp. http://www.ld.com (SYN# 0310 19970702\58-0007.SOL)