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<p>Navigation with Indian Constellation (NavIC), earlier known as the Indian Regional Navigation Satellite System (IRNSS), is an effort made by the Indian Space Research Organization to provide navigation services to the Indian subcontinent and its nearby regions. Since May 2023, NavIC has been providing the Standard Positioning Service (SPS) on three frequency bands, namely, L5 (centered at 1176.45&#xa0;MHz), S (centered at 2492.028&#xa0;MHz) and L1 (centered at 1575.42&#xa0;MHz) through its newest satellite, NVS-01, launched on May 29, 2023. The SPS signal broadcast in the L1 Band of NVS-01, employs Synthesized Binary Offset Carrier (SBOC) modulation scheme. An important and vital subsystem of the NavIC ground segment is the network of IRNSS Range and Integrity Monitoring Stations (IRIMS). The fundamental measurement engine of an IRIMS station is the NavIC reference receiver. One of the dominant sources of noise for a reference receiver is signal multipath. Traditional multipath mitigation methods such as High Resolution Correlator perform well for Binary Phase Shift Keying signals. However, this method is not optimal for multipath mitigation of SBOC signals. A novel method for the mitigation of multipath effect has been investigated and has been developed for SBOC signals using the shaping of S-curve. This technique performs exceptionally well in the mitigation of multipath experienced by SBOC signals like the NavIC L1 signal. This paper details the novel method developed and the results obtained. The paper also provides a comparative performance analysis of the multipath mitigation in SBOC signals by the new method with that of other methods.</p>

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A Novel Multipath Mitigation Tehnique for NavIC SBOC Signal

  • 期刊论文

  • 发表日期：

    2025年4月12日

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  • T. Subramanya Ganesh,
  • Suresh Dakkumalla,
  • Sharda Vashisth,
  • Amitava Sen Gupta

摘要

Navigation with Indian Constellation (NavIC), earlier known as the Indian Regional Navigation Satellite System (IRNSS), is an effort made by the Indian Space Research Organization to provide navigation services to the Indian subcontinent and its nearby regions. Since May 2023, NavIC has been providing the Standard Positioning Service (SPS) on three frequency bands, namely, L5 (centered at 1176.45 MHz), S (centered at 2492.028 MHz) and L1 (centered at 1575.42 MHz) through its newest satellite, NVS-01, launched on May 29, 2023. The SPS signal broadcast in the L1 Band of NVS-01, employs Synthesized Binary Offset Carrier (SBOC) modulation scheme. An important and vital subsystem of the NavIC ground segment is the network of IRNSS Range and Integrity Monitoring Stations (IRIMS). The fundamental measurement engine of an IRIMS station is the NavIC reference receiver. One of the dominant sources of noise for a reference receiver is signal multipath. Traditional multipath mitigation methods such as High Resolution Correlator perform well for Binary Phase Shift Keying signals. However, this method is not optimal for multipath mitigation of SBOC signals. A novel method for the mitigation of multipath effect has been investigated and has been developed for SBOC signals using the shaping of S-curve. This technique performs exceptionally well in the mitigation of multipath experienced by SBOC signals like the NavIC L1 signal. This paper details the novel method developed and the results obtained. The paper also provides a comparative performance analysis of the multipath mitigation in SBOC signals by the new method with that of other methods.