Direction-Finding Based on Time-Modulated Array Without Sampling Synchronization

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Abstract
A two-element direction-finding method based on time modulated array (TMA) without sampling synchronization which exploits new asymmetric time sequences is proposed. The necessity of synchronization between the radio frequency (RF) switches and analog-to-digital converter (ADC) for existing direction-finding methods based on TMA and the influences of synchronization errors on the phases of different harmonics are firstly analyzed and modeled. By considering asymmetric time sequences and the mathematical relationship between adjacent harmonics, the proposed method can estimate the direction of arrival (DOA) without synchronization. Compared to the existing methods, the proposed method avoids the synchronization between the ADC and RF switches while keeps the similar accuracy performance. Numerical simulations are provided to show the feasibility and effectiveness of the proposed method. A simple Sband two-element TMA is fabricated to show the synchronization problem and verify the direction-finding method.
Funding Information
  • National Natural Science Foundation of China (61901263)
  • the SAST Independent RD Plan (ZY2018-23)

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