响应询问 meaning in English

echo request

Secondary surveillance radar ( ssr ) is a hot issue in radar signal processing . from traditional ssr to monopulse ssr , a new - style ssr responder which is based on different frequencies transceiver is widely given more attention now . this responder is grounded on mode s ( selective ) technology
二次雷达一直是国内外雷达信号处理领域的研究热点,由传统的二次雷达到单脉冲二次雷达,发展至今,基于模式s技术的一种新型的基于机载异频收发机响应询问的二次雷达正在得到广泛关注。