Research on Observable Frequency Band Analysis of Solar Radio Current in L-band Based on Simple Thresholding and CUSUM Joint Algorithm

L-band solar radio burst is a potential influencing factor of navigation system instability, through the L-band precision solar current volume monitoring events of solar burst interfering navigation can be found in real time, for this reason Yunnan Astronomical Observatory headquarters intend to establish an L-band multi-frequency point solar radio monitoring system. An effective assessment of the radio environment is essential for the stable access to observational data from the monitoring system. This paper introduces the radio monitoring readiness study of the monitoring platform, and conducts a 100-hour test of the L-band radio environment in the Fenghuangshan area of the Headquarters of the Yunnan Astronomical Observatory. In this paper, an algorithm based on the improved threshold of Simple Thresholding algorithm and CUSUM algorithm is proposed, and 7 radio passbands with less 5 MHz radio interference between the Beidou B1, B2, B3 frequency points, GPS L1 and L2 frequency points are selected, namely 1 551-1 555 MHz, 1 596-1 600 MHz, 1 161-1 165 MHz, 1 221-1 225 MHz, respectively. 1 246-1 250 MHz, 1 291-1 295 MHz, 1 231-1 235 MHz, its cleanliness rates are 98.329%, 98.301%, 98.315%, 98.335%, 98.224%, 97.650%, 98.260%, all of which meet the needs of solar observation. It provides a basis for the next step of receiver design and signal processing.