Enhancement of small doppler frequencies detection for LFMCW radar

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PeerJ Computer Science

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Introduction

Lfmcw radar detection and processing

The transmitted signal of an FMCW radar can be modulated as follow (Levanon & Mozeson, 2004): ST(t)=ATcos(2πfct+2πt0fT(τ)dτ)

=ARcos(2πfc(ttd)+BT(12t2td.t)+fD.t)
Where AR represents the received signal amplitude. The target information can be obtained by mixing the transmitted and received signals in time domain and filtered using low-pass filter (LPF) to generate the intermediate frequency (IF) signal SIF(t) as: SIF(t)=12cos(2π(fc.2RoC)+2π(±2RoC.BT+2fcvC)t)

Where fm is the modulated frequency, Δf is the receiver bandwidth and C is speed of light. Extraction of target information such as range and speed based on 2D-FFT is illustrated as shown in Fig. 2.

The proposed processor

Where x(n) and y(n) represent the output of FFT processor and the output of the proposed filter respectively. The transfer function of the proposed filter can be written as: Y(Z)=X(Z)(10.5Z1)

Computer simulation

Off-pin targets

Middle-pin targets

Hardware implmentation

Conclusion

Supplemental Information

Additional Information and Declarations

Competing Interests

The authors declare that they have no competing interests.

Author Contributions

Sameh Ghanem conceived and designed the experiments, performed the experiments, analyzed the data, performed the computation work, prepared figures and/or tables, authored or reviewed drafts of the paper, and approved the final draft.

Data Availability

The following information was supplied regarding data availability:

Code is available in the Supplemental Files.

Funding

The authors received no funding for this work.

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