A radio frequency (RF) signal detection algorithm is developed based on two-dimensional Fast Fourier Transform (FFT) on phased array time series data. The sensitivity is calculated based on two-frame signal detection criterion. A collection system consisting of a linear phased array and multiple wideband digital receivers is utilized. Simulation results are presented based on the system parameters of the channelization frequency plan including the frequency range, LO, mixer, and sampling frequency. Experimental angle of arrival data are processed, and the results are shown to be in good agreement with the simulation results.
Previous study has used chirp signals to characterize the RF response of a multi-channel RF receiver [1]. The results showed a significant channel imbalance. After applying a time-reversal filter, the channel imbalance was remedied and both phase and amplitude were realigned among the channels. In the present study, the RF response of a complete multichannel receiver with antenna was characterized. A 1-8 GHz phased array antenna was mounted in an anechoic chamber and a chirp signal was used to measure the frequency response of each channel as a function of azimuth angle. Each channel's response was equalized using a time-reversal filter derived from the measured data and a combined beam pattern was formed. Time-reversal filters that steer the beam were also generated and it was found that sidelobe level worsened with larger steer angles. A simple mutual coupling model was proposed to explain the beam pattern feature.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.