Horne et al. Figure 8. Performance of notched LFM waveform in dynamic environment-Simulation. The notch in the interrogation waveform is clearly visible, along with SINR improvement. The inclusion on the waveform notch compromises the autocorrelation sequence sidelobe performance. notched waveform, up to greater than 40 dB for FFAST, showing that significant gain is available from the adaptive waveform design process. The disadvantage, in addition to increased computation, and the requirement for flexible transmitting hardware is in the autocorrelation characteristics of the waveform, which exhibits a wider main lobe, resulting in decreased range resolution and increased sidelobe levels, with the likely consequence of a fall in detection probability or increased false alarm rate. Table 3 summarizes the autocorrelation characteristics for a single snapshot of the ERA Figure 9. Performance of FFAST algorithm in dynamic environment-Simulation. The TMI waveform closely resembles the target response providing further SINR improvement over the notched waveform, at a cost of degraded main lobe width and sidelobe levels in the autocorrelation sequence. JUNE 2020 IEEE A&E SYSTEMS MAGAZINE 57