Data‐driven target localization using adaptive radar processing and convolutional neural networks

Author:

Venkatasubramanian Shyam1ORCID,Gogineni Sandeep2,Kang Bosung3ORCID,Pezeshki Ali4,Rangaswamy Muralidhar5,Tarokh Vahid1

Affiliation:

1. Duke University Durham North Carolina USA

2. Information Systems Laboratories Inc. Dayton Ohio USA

3. University of Dayton Research Institute Dayton Ohio USA

4. Colorado State University Fort Collins Colorado USA

5. AFRL Wright‐Patterson Air Force Base Ohio USA

Abstract

AbstractLeveraging the advanced functionalities of modern radio frequency (RF) modeling and simulation tools, specifically designed for adaptive radar processing applications, this paper presents a data‐driven approach to improve accuracy in radar target localization post adaptive radar detection. To this end, we generate a large number of radar returns by randomly placing targets of variable strengths in a predefined area, using RFView®, a high‐fidelity, site‐specific, RF modeling & simulation tool. We produce heatmap tensors from the radar returns, in range, azimuth [and Doppler], of the normalized adaptive matched filter (NAMF) test statistic. We then train a regression convolutional neural network (CNN) to estimate target locations from these heatmap tensors, and we compare the target localization accuracy of this approach with that of peak‐finding and local search methods. This empirical study shows that our regression CNN achieves a considerable improvement in target location estimation accuracy. The regression CNN offers significant gains and reasonable accuracy even at signal‐to‐clutter‐plus‐noise ratio (SCNR) regimes that are close to the breakdown threshold SCNR of the NAMF. We also study the robustness of our trained CNN to mismatches in the radar data, where the CNN is tested on heatmap tensors collected from areas that it was not trained on. We show that our CNN can be made robust to mismatches in the radar data through few‐shot learning, using a relatively small number of new training samples.

Funder

Air Force Office of Scientific Research

Publisher

Institution of Engineering and Technology (IET)

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