Waveform synthesis for ultra wideband radar

This paper investigates the Fourier synthesis method of waveform generation for ultrawide band (UWB) radar. From Fourier theory, any periodic signal can be decomposed into a sum of weighted sinusoids. Conversely a periodic signal can be generated by a suitably weighted sum of sinusoids. Thus any periodic waveform can be synthesized by summing the outputs of several harmonically related oscillators. This paper extends the waveform generation beyond simple base-band periodic pulses. Generation of complex amplitude coded waveforms at base-band is described. Coded waveforms with accurate control of pulse shape and pulse repetition interval (PRI) can be generated. These waveforms will allow pulse compression and coherent integration of UWB signals and thus reducing the need for very large power sources which are required for conventional impulse radar implementation