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Method for Evaluating Solid State Marine Radar Interference in Magnetron Marine Radars

Previously published field test results showed significant solid state marine radar (SS-MR) interference in magnetron marine radars (M-MRs) at 0.34 nautical miles (NM) distance separation and 55 MHz frequency separation. The interference was mitigated but not completely eliminated by increasing distance separation, activating interference rejection (IR), and increasing frequency separation. The demonstration is significant but anecdotal because detailed descriptions of the SS-MR signals, M-MR, and test procedures were not provided. This paper describes a simulation and analysis method that can reliably estimate the maximum SS-MR interference power the M-MR can tolerate (i.e., its interference protection criteria (IPC)) and the corresponding minimum separation distance (MSD) for a specific frequency separation. The method showed significant interference potential with pulsed FM SS-MR signals when the M-MR was operating at short range. IPC results showed that frequency separation and IR effectively mitigated the SS-MR interference. However, nonlinear amplification effects and aggregate interference in crowed ports or harbors still need to be investigated. The method was also used to emulate the previously published field test. With qualifications, results supported field test results. However more comprehensive comparisons are called for to more fully understand the method's predictive efficacy. In the final analysis, results reported in this paper suggest the proposed method is a promising alternative to more costly and difficult to replicate laboratory and field tests. In future, this method can be used to identify problematic SS-MR signal characteristics, effective IR techniques, minimum frequency separations, and the effects of aggregate SS-MR interference.