Assessment of interference from the Korean regional navigation satellite service on radiolocation service in the L6 band: a case study of FPS-117 radar

초록

A new regional navigation satellite system is being developed in Korea to provide Positioning, Navigation, and Timing (PNT) services using the L6 band, which has already been preferentially allocated to Radiolocation Services (RLS) by the International Telecommunication Union (ITU). While the ITU permits Radio Navigation Satellite Service (RNSS) operations, it requires that these operations do not interfere with RLS. Therefore, to ensure the stability of both services, it is essential to assess the potential interference of the new regional navigation satellite system with RLS in advance. This study aims to evaluate the potential interference on the FPS-117 radar, selected as a representative RLS system operating in Korea, due to the new PNT satellite system, in line with ITU radio regulations and recommendations. Considering the classified nature of specific radar parameters, the analysis employs representative operational models and conservative assumptions based on ITU recommendations. To achieve this, the paper proposes a three-step evaluation methodology and introduces an indicator to facilitate the efficient interpretation of the results. The results indicate that while the worst-case interference-to-noise ratio may reach 2.5 dB-exceeding the ITU protection threshold of -6 dB-the probability of such occurrences is negligible (less than 0.01%) and the duration is transient. Consequently, it is expected that the new PNT satellite system will not cause significant performance degradation to the FPS-117 radar.

키워드