Abstract
Abstract The basic frequency diverse array (FDA) using linearly increasing frequency increments generates a range-angle dependent beampattern. However, it is coupled in range and angle dimensions and is also periodic in range and time, making its applications limited. In this paper, a novel FDA beampattern synthesis approach is proposed utilizing the time-modulated double parameters based on the chaos sequence. The chirp signal mechanism is used instead of the single-frequency signal mechanism. Meanwhile, the multi-carrier architecture is used for range-angle decoupling. Satisfactory time-invariant range-angle beampattern can be synthesized for both single and multiple targets locations. Simulation results show the effectiveness of the proposed FDA scheme. Furthermore, comparative study with the existing technology indicates that the proposed approach can provide better performance in spatial focusing and side-lobe suppressing.
Highlights
First proposed in [1] and [2], frequency diverse array (FDA) technology generates beampatterns that depend on the range, angle and time by introducing a tiny frequency offset among the array elements
Timeinvariant range-angle beampattern is achieved by using the time-modulated double parameters based on the chirp signal mechanism
Numerical simulations are carried out to evaluate the performance of the proposed TMDP-FDA, and the main results are compared with the MC-FDA
Summary
First proposed in [1] and [2], frequency diverse array (FDA) technology generates beampatterns that depend on the range, angle and time by introducing a tiny frequency offset among the array elements. A novel FDA beampattern synthesis approach is proposed based on the chirp signal mechanism where frequency offset as well as chirp constant modulation are both considered. In order to eliminate the time-variant and range-periodic characteristics of the beampattern, and improve the performance of the FDA system in spatial focusing and side-lobe suppressing, a new scheme based on the time-dependent frequency offset and chirp constant is designed, namely the Time-Modulated Double-Parameter FDA (TMDP-FDA). Suppose the target position is (r0 , 0 ) , and for the nth carrier at the mth element, the frequency offset and chirp constant are defined as fn,m = f pn,m t r0. During the ith time window, the frequency offset and chirp constant for the nth carrier at the mth element are defined as f in,m = f t pn,m r0 (t). It can be seen that the angle complex weight needs to be changed for different subpulses, while the range complex weight remains unchanged during the total pulse duration
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