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<p>The Wirelessly Distributed Digital Phased Array (WDDPA) is an ongoing  research program at the Naval Postgraduate School (NPS) which has numerous possible  applications in radar and communication systems. The WDDPA incorporates many array  elements randomly or nonuniformly in the environment or on a platform. Array elements  are synchronized and controlled over a wireless channel. Compared to conventional  phased array systems, its advantages are adaptability, survivability and flexibility.  Phase synchronization is a critical component of the WDDPA development. The  common phase reference is vital to steer the beam and control the radiation pattern for the  phased array system. The objective of this paper is to improve the WDDPA  synchronization operation. Previous hardware and software architectures were replaced  or modified to improve the accuracy and speed of the phase synchronization.  A series of experiments, first for hardwired channels, then for wireless channels,  were conducted successfully to verify the synchronization operation for two elements.  Several problems with the circuit were diagnosed and then addressed. The overall  performance of the improved synchronization circuit for the demonstration array was  satisfactory, allowing phases to be synchronized within 20Â° wirelessly. The architecture  for the potential successor of the synchronization circuit is introduced. It is more flexible  and robust than the current circuit and thus more desirable for future applications of the  WDDPA.
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<br>Subjects: Radar</div>
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Tsai, Yen-Chang</div>
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