How do I design the waveform for a stepped frequency radar for high range resolution imaging?

A stepped-frequency radar achieves high range resolution by transmitting a series of N narrowband pulses at equally spaced frequencies across a total bandwidth B, then coherently processing the received echoes to synthesize a wideband waveform equivalent to a single pulse with bandwidth B. The range resolution is: delta_R = c / (2B), identical to a conventional wideband radar with bandwidth B, but the instantaneous bandwidth of each transmitted pulse is much narrower (B/N). The waveform design involves: selecting the total bandwidth B (B = c / (2 x delta_R); for 0.15 m range resolution: B = 1 GHz; for 1 m resolution: B = 150 MHz), selecting the number of frequency steps N (more steps provide better sidelobe performance in the synthesized range profile; typical N = 64-1024 steps; the unambiguous range is: R_unambiguous = c / (2 x delta_f) where delta_f = B/N is the frequency step size), selecting the step size delta_f (delta_f = B / N; for B = 1 GHz and N = 256: delta_f = 3.91 MHz; unambiguous range = 38.3 m), and selecting the dwell time at each frequency (the dwell time must be long enough to: complete the round-trip propagation to the maximum target range, allow the receiver to settle and sample the return signal, and achieve the required SNR per step). The coherent processing combines the amplitude and phase of each frequency step into a synthetic range profile using an inverse DFT (IDFT): the IDFT of the frequency-domain measurements produces the range profile of the target.