FDA radar using Costas sequence modulated frequency increments

Frequency diverse array (FDA) radar provides new application capabilities and potentials due to its range-dependent transmit array beampattern, but the FDA using linearly increasing frequency increments produces a range and angle coupled beampattern. This paper proposes a uniform linear array (ULA) FDA using Costas sequence modulated frequency increments to produce random-like energy distribution in the transmit beampattern to decouple the range-angle-dependent of targets. In doing so, the range and angle of targets can be solely estimated through matched filtering and subspace decomposition algorithms in the receiver signal processor. Numerical results show that the proposed scheme outperforms the standard FDA in focusing the transmit energy, especially in the range dimension.