FMNet: Latent feature-wise mapping network for cleaning up noisy micro-doppler spectrogram

Chong Tang, Wenda Li, Shelly Vishwakarma, Fangzhan Shi, Simon J. Julier, Kevin Chetty

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Micro-Doppler signatures contain considerable information about target dynamics. However, the radar sensing systems are easily affected by noisy surroundings, resulting in uninterpretable motion patterns on the micro-Doppler spectrogram (μ-DS). Meanwhile, radar returns often suffer from multipath, clutter, and interference. These issues lead to difficulty in, for example, motion feature extraction and activity classification using micro-Doppler signatures. In this article, we propose a latent feature-wise mapping strategy, called feature mapping network (FMNet), to transform measured spectrograms so that they more closely resemble the output from a simulation under the same conditions. Based on measured spectrogram and the matched simulated data, our framework contains three parts: an encoder which is used to extract latent representations/features, a decoder outputs reconstructed spectrogram according to the latent features, and a discriminator minimizes the distance of latent features of measured and simulated data. We demonstrate the FMNet with six activities data and two experimental scenarios, and final results show strong enhanced patterns and can keep actual motion information to the greatest extent. On the other hand, we also propose a novel idea which trains a classifier with only simulated data and predicts new measured samples after cleaning them up with the FMNet. From final classification results, we can see significant improvements.
Original languageEnglish
Article number5106612
Number of pages12
JournalIEEE Transactions on Geoscience and Remote Sensing
Early online date21 Oct 2021
Publication statusPublished - 2022


  • Activity classification
  • adversarial autoencoder (AAE)
  • deep learning (DL)
  • feature mapping
  • micro-Doppler spectrogram (μ-DS)
  • passive WiFi radar (PWR)
  • variational autoencoder (VAE)


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