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Integrated Communication and Navigation Measurement Signal Design for LEO Satellites with Side-Tone Modulation
Xue Li1, Yujie Feng2, Linshan Xue3
1Ctr Commun and Tracking Telemetry Command, Chongqing University, Chongqing 400044, China.
Sensors (Basel, Switzerland)
|September 27, 2025
Summary
This study integrates Orthogonal Frequency Division Multiplexing (OFDM) signals with sidetone signals for enhanced Low Earth Orbit (LEO) satellite communication and precise ranging. The novel system improves efficiency and accuracy, reducing power needs and boosting ranging precision.
Area of Science:
- Satellite Communication Systems
- Signal Processing
- Aerospace Engineering
Background:
- Traditional Low Earth Orbit (LEO) satellite systems face challenges with complexity, resource waste, and interference due to separate communication and measurement functions.
- Integrating communication and ranging functions is crucial for improving efficiency in LEO satellite systems.
Purpose of the Study:
- To propose an integrated Orthogonal Frequency Division Multiplexing (OFDM) signal system combining sidetone signals for communication and precise measurement in LEO satellites.
- To address system complexity, resource waste, and interference issues in conventional LEO satellite systems.
Main Methods:
- Utilizing OFDM technology with multi-frequency sidetone signals and short-period coprime pseudorandom codes for composite ranging codes.
- Implementing a dual-mode channel estimation algorithm to merge results from ranging pilots and sidetone signals.
- Employing an adaptive ranging mode switching mechanism for balancing ranging accuracy and spectral efficiency.
Main Results:
- Achieved a bit error rate of approximately 10-3 at 6 dB Signal-to-Noise Ratio (SNR), reducing transmission power by 3 dB compared to conventional methods.
- Obtained centimeter-level ranging accuracy of approximately 0.02 m, an improvement of 3-4 orders of magnitude over traditional pilot methods.
- Demonstrated significant enhancement in system performance through integrated channel estimation and adaptive ranging.
Conclusions:
- The proposed integrated system offers a high-precision, high-efficiency solution for LEO satellite communication and ranging.
- The system effectively reduces bit error rate and transmission power while significantly improving ranging accuracy.
- Future work should include comprehensive error modeling for practical deployment considering hardware imperfections and environmental variations.
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