A New Pseudorandom Emission Waveform Modulation Method for Electromagnetic Detection

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Abstract
Multidominant-frequency pseudorandom waveforms are widely used in electromagnetic detection to enhance resolution and robustness. Conventional synthesis methods for such waveforms are limited by fixed spectral configurations, constrained amplitude ratios, and low adaptability to dynamic field environments. To address these critical constraints, this study introduces a novel graphical modulation method based on pulsewidth modulation (PWM) harmonic analysis. The proposed method improves adaptability and frequency diversity in PRW generation for electromagnetic detection. Theoretical analysis reveals the harmonic distribution characteristics of traditional PWM signals, leading to an innovative dual-frequency modulation strategy that combines adjacent and frequency-doubled waveforms. This breakthrough enables programmable harmonic structures, overcoming the limitations of conventional rigid or complex pseudorandom synthesis architectures. At present, no adequate model exists for a chaotic-based adaptive pseudorandom sequence generator, applied in digital encryption, that is capable of producing square-wave pseudorandom sequences while simultaneously controlling their spectral characteristics. Further research and development are needed in this area. Simulation and experimental results demonstrate the proposed method’s capability to reconfigure (1, 2, 4), (1, 3, 5), and (1, 3, 7)-type dominant frequency distributions in real time. This provides robust technical support for dynamic detection in complex electromagnetic environments, addressing the key needs of high-efficiency and high-accuracy geological surveys and energy exploration.
Funding Information
  • Deep Earth Probe and Mineral Resources Exploration – National Science and Technology (2024ZD1003000)
  • National Natural Science Foundation of China (423B2412)
  • Science and Technology Development Plan Project of Jilin Province, China (20240602061RC)

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