ABSTRACT
This chapter describes a method for performing array antenna pattern calculations with nonsinusoidal waveforms, those generally described in the time domain. The concept is illustrated using unipolar pulsed waveforms arranged in a pseudorandom code. The correlation properties of pseudorandomly coded waveforms are taken into account to assess system performance for systems using correlating receivers. A two-way correlatable energy pattern would be useful in predicting radar performance for a radar operating with a coded waveform and correlating receiver. One way to accomplish time-coherent integration is to use specially coded signals and a correlating receiver. The techniques used in direct-sequence spread-spectrum provide a method for coding signals such that they can easily be compressed to give the distance resolution of a single impulse. An arbitrary aperture distribution can be modeled in a sampled sense as a collection of point source radiators. Contributions from many such point sources can be used to model a continuous aperture distribution of current in a sampled sense.
