A brief history of waveform diversity

The U.S. Air Force has set an ambitious goal to be able to anticipate, find, fix, track, target, engage, and assess - anything, anytime, anywhere [1]. We will not achieve order of magnitude improvement in detection and tracking performance solely through larger antennas and more power. Instead, advanced signal processing techniques and system concepts will be required. Achieving the sought after demanding goals will instead require a distributed network of heterogeneous sensors.