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Abstract <p>At L-band frequencies, solar radio bursts (SRB) essentially function as a powerful and sudden radio interference source, causing the Global Navigation Satellite System (GNSS) receiver to experience an abruptly enhanced noise level and a simultaneous drop in C/N<sub>0</sub> or signal-to-noise ratio (SNR). This situation will become worse with strong intensity SRBs, where the tracking loops are unable to maintain lock, which causes cycle slips and even a momentary loss of some GNSS signals. In this paper, we present the details of the strong SRB event of 28 August 2022 and its effect on GNSS signals at L band frequencies over the American sector. A cubic spline based baseline fitting method was implemented to identify the affected satellites with the SNR deviations from the error-free reference level. The impact of the radio burst has been found at L1, L2 and L5 frequencies. The highest SNR deviations were recorded near 5° N latitude, with the BOGT station reporting peak values of 22.45 dB-Hz for the L2 signal and 19.62 dB-Hz for the L1 signal. From the results, SNR deviations are very significant at L2 frequencies than L1 and L5 frequencies. SRB threshold based classification procedure is implemented and GPS L1, L2 and L5 signals analysis is included. It is found that L2 signal is highly susceptible than L1 and L5 signals. Ionospheric Amplitude Index S4 is computed for the SRB affected GPS satellites. The GPS PPP error analysis is carried out to analyse the linkage between E, N, U positioning errors and SRB SNR fading levels.</p>

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Multi Frequency Analysis of Solar Radio Burst on 28 August 2022 and Its Impact on GPS Signals and Positioning Accuracy

  • 期刊论文

  • 发表日期：

    2026年7月29日

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  • G. Venkata Ramana,
  • M. Sridhar,
  • R. Lakshmi Namratha,
  • D. Venkata Ratnam

摘要

Abstract

At L-band frequencies, solar radio bursts (SRB) essentially function as a powerful and sudden radio interference source, causing the Global Navigation Satellite System (GNSS) receiver to experience an abruptly enhanced noise level and a simultaneous drop in C/N0 or signal-to-noise ratio (SNR). This situation will become worse with strong intensity SRBs, where the tracking loops are unable to maintain lock, which causes cycle slips and even a momentary loss of some GNSS signals. In this paper, we present the details of the strong SRB event of 28 August 2022 and its effect on GNSS signals at L band frequencies over the American sector. A cubic spline based baseline fitting method was implemented to identify the affected satellites with the SNR deviations from the error-free reference level. The impact of the radio burst has been found at L1, L2 and L5 frequencies. The highest SNR deviations were recorded near 5° N latitude, with the BOGT station reporting peak values of 22.45 dB-Hz for the L2 signal and 19.62 dB-Hz for the L1 signal. From the results, SNR deviations are very significant at L2 frequencies than L1 and L5 frequencies. SRB threshold based classification procedure is implemented and GPS L1, L2 and L5 signals analysis is included. It is found that L2 signal is highly susceptible than L1 and L5 signals. Ionospheric Amplitude Index S4 is computed for the SRB affected GPS satellites. The GPS PPP error analysis is carried out to analyse the linkage between E, N, U positioning errors and SRB SNR fading levels.