Joint Design of FDA Waveform and Receive Filter for Integrated Detection and Countermeasure

The increasing complexity of modern electromagnetic operating environments demands advanced electronic systems that support concurrent multifunctionality. This paper presents a joint design method for frequency diverse array (FDA) waveform and receive filter to enable simultaneous target detection and non-cooperative radar (NCR) electronic countermeasure (ECM). The considered scenario involves multiple airborne targets, non-cooperative platforms, and signal-dependent interference sources distributed across different angular sectors. To ensure ECM compatibility, the FDA waveform is constrained to resemble the prescribed countermeasure waveforms, while waveform-and-angle-dependent receive filters are designed to enhance target detection and suppress interferences. The joint optimization problem is formulated to maximize the output signal-to-interference-plus-noise ratio (SINR) while minimizing the similarity between the FDA waveform and the predefined countermeasure waveforms, subject to practical constraints including transmit energy (TE) and constant modulus (CM). This non-convex problem is decomposed into tractable subproblems and solved iteratively using an alternating minimization (AM) framework. The convergence of the proposed algorithm is established through rigorous theoretical analysis. Numerical simulations validate the effectiveness of the proposed approach.