A performance analysis of cosite filters in a collocated SINCGARS environment

The US Army conducted a development program for frequency hopping filters to reduce cosite interference. CETCD designed a cosite filter for the SINCGARS system under this program. The availability of frequency hopping filters provides the user with the opportunity to dramatically improve performance in installations now limited by cosite interference. The authors present an analysis of the CETCD cosite filter using both a computer simulation and recent field test data. The data show that when SINCGARS systems are operated with common frequency allocations in a collocated environment, the mutual interference severely degrades system performance. The data also show a significant improvement (10 dB to 50 dB, depending on hopset) in performance when the cosite filter is added to the system. Data are also presented which summarize the performance of filtered systems and describe some useful bounds on system parameters such as filter selectivity, insertion loss, bandwidth, size, and cost in an effort to aid users in specifying cosite filters