Report on Investigation of Anti-Jam Receivers for Search Radar

This report covers the work done at this Laboratory during the past year, on anti-jam receivers for search radar equipments. The first part of the report covers the development of a standard test procedure to be used in the testing of all a-j receivers handled at the laboratory. The second part covers the investigation of the a-j characteristics of the PPI with a view to determining what characteristics the system as a whole, as well as the PPI itself, must possess if the PPI is to perform well in the presence of jamming. This is followed by three parts covering the work done on three specific systems. The SC-3 was thoroughly investigated and field changes recommended to bring it up to date in a-j performance. Several models of the receiver for the AN/TPS-1B Marine Radar System were tested during its development by Bell Telephone Laboratories, and recommendations for improvements were made. The original receiver for the XBF-1 system, under development at this laboratory, was tested and a a new receiver for this system was built and tested in order to test several new back-bias systems and compare their performance. A great deal has been learned of the fundamentals of anti-jamming during this work and these fundamentals are discussed as they come up in the work. The final part contains a summary of the design features necessary in an a-j receiver together with references to specific earlier divisions of the report in which the discussions of particular requirements occur.