Micro-Doppler Ambiguity Resolution for Wideband Terahertz Radar Using Intra-Pulse Interference

Area of Science:

• Radar Systems Engineering
• Signal Processing
• Electromagnetics

Background:

• Micro-Doppler signatures are crucial for target recognition but often cause ambiguity in terahertz radar due to high carrier frequencies.
• Existing parameter estimation methods struggle with micro-Doppler ambiguity in the terahertz band.

Purpose of the Study:

• To propose and validate a novel method for micro-Doppler ambiguity resolution in wideband terahertz radar.
• To mitigate the issue of significant micro-Doppler effects in the terahertz frequency band.

Main Methods:

• A micro-Doppler ambiguity resolution method utilizing intra-pulse interference processing is developed.
• The proposed method reduces the apparent micro-Doppler frequency by several orders of magnitude.
• Experiments were conducted using a 0.22 THz wideband radar system.

Main Results:

• The intra-pulse interference processing effectively reduces micro-Doppler signatures, resolving ambiguity.
• Experimental validation demonstrated the method's effectiveness on a 0.22 THz radar system.
• Monte Carlo simulations confirmed high estimation precision and excellent noise immunity.

Conclusions:

• The proposed intra-pulse interference method successfully resolves micro-Doppler ambiguity in wideband terahertz radar.
• The technique offers a viable solution for accurate target recognition in the terahertz band.
• The method exhibits robust performance with high precision and noise immunity.