Pushing the Limit of Range Resolution Beyond Bandwidth Constraint with Triangle FMCW

TL;DR

This paper introduces a novel signal processing method for FMCW sensing that doubles range resolution without increasing bandwidth by exploiting phase consistency in triangle FMCW signals, validated through simulations.

Contribution

It presents a new technique that surpasses traditional bandwidth limits for range resolution in FMCW systems using phase consistency analysis.

Findings

Range resolution doubled without bandwidth increase

High spectrum SNR maintained

Validated through model-based simulations

Abstract

This paper proposes a novel signal processing technique that doubles the range resolution of FMCW~(Frequency Modulated Continuous Wave) sensing without increasing the required bandwidth. The proposed design overcomes the resolution limit imposed by bandwidth by exploiting the phase consistency observed in the special frequency variation of the beat signal derived from triangle FMCW. Through this approach, the resolution is doubled while maintaining high spectrum SNR. A system model for signal processing is presented, and the energy distribution of the derived beat spectrum is analyzed. The effectiveness of the proposed technique is validated through model-based simulations.