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A novel method for reading multi-resonator based chipless RFID tags using an UWB linear chirp signal is presented in this paper. For the reader, a coherent frequency modulated continuous wave (FMCW) bi-static radar receiver architecture is used. A signal processing technique based on Hilbert transform is used to decode tag's data by detecting both amplitude and phase information. Accurate detection of the tag is achieved in simulations. With this interrogation technique, a very low cost chipless RFID reader with only one voltage controlled oscillator (VCO) is possible. In contrast to previous generation readers, this reader does not need any calibration tag to decode data.