Satellite communication plays a vital role in modern military and civilian applications, but its susceptibility to interference has driven the development of various anti-jamming techniques. This article summarizes six key foreign technologies: spread spectrum, coding and modulation, antenna anti-jamming, on-board processing, transform-domain processing, and amplitude-domain processing, along with adaptive link techniques, analyzing their principles and applications.
1. Spread Spectrum Technology
Spread spectrum enhances anti-jamming capability by expanding signal bandwidth, reducing power spectral density. Direct Sequence Spread Spectrum (DSSS) uses pseudo-random codes to widen the signal bandwidth, dispersing narrowband interference energy. This is critical in military satellite communications, countering intentional jamming (e.g., co-frequency or broadband noise interference) to ensure secure command and intelligence transmission.
2. Coding and Modulation Technology
Advanced error-correcting codes (e.g., Turbo codes, LDPC) combined with high-order modulation (e.g., PSK, QAM) improve spectral efficiency while mitigating interference-induced errors. For example, LDPC with high-order QAM enhances commercial satellite services (e.g., HDTV, internet) and ensures robust military communication in contested environments.
3. Antenna Anti-Jamming Technology
Adaptive and smart antennas dynamically adjust beam patterns to nullify jammers. Adaptive antennas steer nulls toward interference sources, while smart antennas use multi-array processing for spatial filtering. These are vital in military SATCOM to counter electronic warfare threats.
4. On-Board Processing (OBP) Technology
OBP performs signal demodulation, decoding, and routing directly on satellites, reducing ground relay vulnerabilities. Military applications include secure local processing to prevent eavesdropping and optimized resource allocation for efficiency.
5. Transform-Domain Processing
Techniques like FFT and wavelet transforms convert signals to frequency or time-frequency domains for interference filtering. This combats broadband and time-varying jamming, improving adaptability in complex electromagnetic environments.
6. Amplitude-Domain Processing
Limiters and Automatic Gain Control (AGC) suppress strong impulsive interference (e.g., lightning or enemy jamming), protecting receiver circuits and maintaining link stability.
7. Adaptive Link Technology
Real-time adjustments to coding, modulation, and data rates based on channel conditions (e.g., SNR, BER) ensure reliable communication despite weather or jamming. Military systems leverage this for resilience in dynamic warfare scenarios.
Conclusion
Foreign anti-jamming technologies employ multi-layered approaches spanning signal processing, coding, and adaptive systems. Military use prioritizes robustness and security, while commercial applications focus on efficiency. Future advancements may integrate AI and real-time processing to counter evolving threats.
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Post time: Jul-29-2025