A novel signal presence detection strategy in beamforming spectra for weak signal detection
Kehao Zhang, Silong Tang, Ning Liu, Kai Chang, Yipeng Liu, Qun Wan · IET conference proceedings. · 2024
In complex electromagnetic environments, passive radio direction determination often encounters a challenge where distant weak signals and nearby strong signals are difficult to separate in both the time and frequency domains. Weak signals are often masked by the presence of strong signals, making detection and localization problematic. To address this issue, this paper presents an approach that leverages the spatial spectrum generated by conventional beamforming techniques, utilizing its spectral valley features as confidence indicators for the rapid evaluation of spatial spectrum-based direction determination results. This method significantly enhances the detection probability of weak signals in the presence of strong signals, while simultaneously reducing false alarms when weak signals are absent.