Multiple Access Active sonar (MAAS)

The Multiple Access Active Sonar (MAAS) program utilizes a unique algorithm to design frequency hopping chip sequences and associated processing to provide wideband waveforms which are extremely robust to the presence of reverberation, doppler, multipath, and interference from other in-band signals. The waveforms, and their related specialized processing algorithms, are applicable to all forms of active sonar, including multistatic systems. Generation of frequency hopping waveforms, and subsequent processing of the echoes are computationally inexpensive, and initial algorithms have successfully been incorporated into in-buoy hardware for air ASW demonstrations.