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Analysis of radio frequency interference affecting S-band RNSS receiver
Hyung-Jun Hong1, Subin Lee1, Young-Jin Song1
1Autonomous Navigation Laboratory, Electrical and Computer Engineering, Inha University, Incheon, 22212, South Korea.
Scientific Reports
|July 15, 2026
Summary
Regional Navigation Satellite Systems (RNSS) signals in the S-band face interference from LTE and ISM bands. LTE uplinks caused the most signal degradation, impacting reception quality for systems like NavIC.
Area of Science:
- Satellite Navigation
- Radio Frequency Interference
- Signal Processing
Background:
- The S-band (2483.5-2500 MHz) is considered for Regional Navigation Satellite Systems (RNSS) like NavIC and KPS.
- Adjacent terrestrial services (LTE, ISM) pose potential interference risks to RNSS signals in this band.
Purpose of the Study:
- To investigate the impact of real-world adjacent-band interference on S-band RNSS signal reception quality.
- To evaluate the performance of different RNSS waveforms under interference conditions.
Main Methods:
- Digital generation of BPSK(1) and BOC(5,2) waveforms.
- Combination with real-world interference recordings from the Korean spectrum.
- Processing using a software-defined radio (SDR) system under various quantization and gain control scenarios.
Main Results:
- Long-Term Evolution (LTE) uplinks caused the most significant degradation in carrier-to-noise density ratio (C/N₀).
- Microwave ovens and Wi-Fi devices also introduced noticeable interference.
- The BOC(5,2) waveform was generally more susceptible to interference than BPSK(1).
- Low-bit quantization exacerbated signal degradation, while automatic gain control (AGC) offered partial mitigation.
Conclusions:
- Adjacent band interference, particularly from LTE uplinks, poses a significant challenge to S-band RNSS signal integrity.
- Receiver design choices, including waveform selection and processing techniques like AGC, are critical for mitigating interference effects.
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