Identification and Compensation for D-Dot Measurement System in Transient Electromagnetic Pulse Measurement

Area of Science:

• Electromagnetics and Signal Processing
• System Identification and Control Theory

Background:

• Accurate measurement of transient pulsed electromagnetic (EM) fields is crucial for electromagnetic compatibility (EMC) analysis.
• D-dot sensors with numerical integration are standard for electromagnetic pulse (EMP) measurement but suffer from signal distortion due to non-ideal frequency response and noise.
• Existing methods struggle with dynamic performance limitations of sensors.

Purpose of the Study:

• To develop a robust system identification and compensation method for D-dot sensors to improve transient EM field measurement.
• To address the limitations of numerical integration in reconstructing distorted signals from D-dot sensors.
• To enhance the dynamic characteristics and signal recovery accuracy of EM field measurement systems.

Main Methods:

• Employed a nonlinear Hammerstein model for system identification of D-dot sensors using laboratory calibration data.
• Utilized a two-step identification approach with low and high-frequency pulse excitation modes to model ultra-wideband sensor characteristics.
• Developed a compensation system based on the identified nonlinear Hammerstein model for practical E-field signal recovery.

Main Results:

• Successfully identified and modeled the nonlinear dynamic behavior of the D-dot sensor.
• The developed compensation system significantly improved the sensor's dynamic characteristics.
• The compensation approach demonstrated superior performance in recovering incident E-field signals compared to the traditional integration method.

Conclusions:

• The nonlinear Hammerstein model provides a reliable framework for understanding and improving D-dot sensor performance.
• The proposed compensation system effectively overcomes the limitations of conventional signal recovery techniques.
• This advancement offers a more accurate and robust method for transient pulsed EM field measurements.