High resolution radar range imaging method using bandwidth extrapolation

The high resolution radar demands transmitting ultra wide bandwidth chirp signals, which consequently leads to increasing the system complexity and expenses. The frequency domain AR model for radar chirp signals was presented in the paper based on the bandwidth extrapolation technique together with linear prediction algorithm to broaden the effective bandwidth of the signal. The performance estimation function, namely the prediction error as a function of the linear error prediction filter length, was derived through analyzing large numbers of computer simulation experiment results. It is of considerable importance to determine the linear error prediction filter length for optimizing the bandwidth extrapolation parameters. It is demonstrated by the theoretical analysis and simulation results that the bandwidth extrapolation method is feasible and effective for increasing bandwidth of the radar signal to obtain higher range resolution.