Super-resolution reconstruction-based channel estimation for measured data of passive radar

In order to solve the problem of insufficient accuracy in the measured reference channel estimation for DRM (digital radio mondial) based passive radar，this paper studies a super-resolution reconstruction network-based estimation method under limited measured samples．On the design of the deep network，the frequency domain channel response obtained by the LS (least squares) channel estimation method is regarded as a low-resolution image，and is reconstructed into a high-precision channel response through VDSR (very deep super-resolution reconstruction) network，and finally the accurate estimation of the reference signal is obtained．On the construction of the training data set，due to the difficulty of obtaining a large amount of measured data corresponding to different channel environments in DRM-based passive radar，the time domain channel response is first estimated based on the measured data by the LS method to roughly determine the approximate delays and gains of the multipath in the channel．Then，based on the simulation of DRM waveform，enough training data with different channel environments is obtained to train the proposed super-resolution reconstruction network． Finally，the pre-trained model is used to predict the measured data． The experimental results show that the proposed method can achieve higher accuracy than traditional channel estimation methods. © 2023 Huazhong University of Science and Technology. All rights reserved.