Duty factor impact on WIFIRAD radar image quality

WIFIRAD — a passive radar demonstrator developed at the Warsaw University of Technology — utilizes signals from the WIFI networks as sources of illumination. As these WIFI signals are not continuous and the duty factor depends on the amount of transmitted data by the WIFI network nodes, authors focused on an impact of the duty factor on the quality of the detections obtained by the WIFIRAD. This paper contains a description of the illuminating signal, a short analysis of an impact of the duty factor on a shape of the cross-ambiguity function and the results of the experiments. The experiment was planned to show how the amount of the traffic in the WIFI network impacts duty factor and how it impacts crossambiguity function obtained by the WIFIRAD. The set of experiments in the bistatic configuration were conducted in an outdoor environment using a 2-node WIFI network, the WIFIRAD as radar and a car as a target. The main goal of this paper is to show how the amount of the illuminating signal impacts the range-Doppler matrix.