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This paper addresses the challenges of wideband signal beamforming in radarsystems and proposes a new calibration method. Due to operating conditions, thefrequency dependent characteristics of the system can be changed, andamplitude, phase, and time delay error can be generated. The proposed method isbased on the concept of sliding window algorithm for linear frequency modulated(LFM) signals. To calibrate the frequency-dependent errors from transceiver andthe time delay error from true time delay elements, the proposed methodutilizes the characteristic of the LFM signal. The LFM signal changes itsfrequency linearly with time, and the frequency domain characteristics of thehardware are presented in time. Therefore, by applying matched filter to a partof the LFM signal, the frequency dependent characteristics can be monitored andcalibrated. The proposed method is compared with the conventional matchedfilter based calibration results and verified by simulation results andbeampatterns. Since the proposed method utilizes LFM signal as calibrationtone, the proposed method can be applied to any beamforming systems, notlimited to LFM radars.

Calibration of Wideband LFM Radars based on Sliding Window Algorithm