Adaptive Frequency Offset Selection in Frequency Diverse Array Radar

TLDR

FDA provides a range‑angle‑dependent beam through fixed frequency increments, but this rigidity limits performance in varied environments. The paper proposes an adaptive frequency offset selection scheme to steer the transmit beam direction. The scheme designs the transmit frequency increment at each step to maximize output SINR. Simulations confirm that the adaptive scheme can steer the beam to match target angle and range.

Abstract

Frequency diverse array (FDA) can provide a range-angle-dependent beam that can be controlled by using a frequency increment between adjacent elements, but the frequency increment is fixed in a basic FDA, which restraints the performance improvement in different environments significantly. In this letter, we propose an adaptive frequency offset selection scheme to control the transmit beam direction by choosing the frequency offset adaptively. In doing so, we design the frequency increment of transmit signal in each step by maximizing the output signal-to-interference-plus-noise ratio (SINR) criteria. Our proposal can adaptively adjust the beam direction to match the current target angle and range sector. The effectiveness of the proposed scheme is verified by simulation results.