To meet the needs of electronic countermeasures and terminal penetration, hy-18a and hy-19a electronic countermeasures radio altimeters are developed. They adopt frequency agility, radiation power control, beam control, anti burning, anti blocking, echo frequency domain processing and other technologies, and have excellent anti-jamming performance. At the same time, according to echo spectrum broadening, Doppler frequency, height and other information under different sea conditions, they integrate Haiqing identification function Yes.