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Parameter Conditions for Phase Unwrapping and Coherent Processing in the TARF Communication

Translational acoustic radio-frequency (TARF) enables the first practical communication link across the water-air interface. In the environment with natural waves, TARF faces two problems. First, natural waves can cause wrapped phase which must be unwrapped before decoding. Second, coherence is fundamental for decoding. This paper analyzes the conditions when phase wrapping occurs, phase unwrapping succeeds, or coherence is available during coherent processing interval. These conditions propose joint requirements on the radar and natural wave parameters, which are summarized into instruction steps for radar design and operation. Besides, the ocean-wave spectrum is employed for the wave parameter analysis, as well as the evaluation of TARF performance.