FDA Beampattern Synthesis With Both Nonuniform Frequency Offset and Array Spacing

The frequency diverse array (FDA) can generate a beampattern with dual dependence on angle and range by adding a smaller frequency component to the carrier frequency. To overcome the range-angle dependent in the classical FDA, several FDA frameworks with nonuniform frequency offset are proposed to obtain a dot-shaped beampattern. To obtain the dot-shaped beampattern with better performance, a symmetry FDA with both nonuniform frequency offset and array spacing is proposed. The symmetry nonuniform frequency offset is adopted to generate the dot-shaped beampattern, whereas the nonuniform array spacing is introduced to suppress sidelobes in the both range and angle directions. Numerical simulation results validate the improved performances of the proposed FDA in terms of the suppressed sidelobe level and the improved anti-interference ability, compared with the symmetric logarithmic frequency offset FDA.