ASFIR THIRD SITE MODIFICATIONS
Final rept. Jul 1965-Aug 1966
RADIO CORP OF AMERICA MOORESTOWN NJ MISSILE AND SURFACE RADAR DIV
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Changes and additions were made to the two-site Active Swept Frequency Interferometer Radar ASFIR to provide three-site capability. Addition of the second base line 3rd Site required a new angle tracker, timing and logic modifications, new mode selection logic and revised data formatting. Distribution and generation of new RF signals were also required. New capability designed into the modification program included extended unambiguous range tracking to 3600 nmi, reduction of system timing jitter, frequency multiplexing of the range rate and angle rate signal processing, and target simulation. The total modification kit included six new racks of equipment plus considerable changes to the existing 14 racks of equipment, including relocation for optimum packaging. Verification of the changes, using the target simulator which proved to be an effective tool for system test, alignment and evaluation and by tracking Echo II, showed a considerable improvement in track loop performance and a 31 reduction in system timing jitter. Data formatting and logic compatibility were shown by producing a test data tape for data reduction. Detailed recommendations include noise reduction techniques, short term phase stability improvements, improved modulation methods, and system changes to eliminate system timing jitter and to provide AGC.
- Electrical and Electronic Equipment
- Active and Passive Radar Detection and Equipment