摘要
高速、高机动隐身飞行器严重压缩了防空导弹雷达导引头的探测威力,而通过增加相参积累时间提高导引头灵敏度是解决此问题的有效技术途径之一。提出一种基于瞬时测频原理的长时间相参积累算法,用于脉冲多普勒雷达导引头对隐身目标的检测。该算法将电子对抗领域成熟的瞬时测频技术创新应用于雷达导引头的目标检测过程中,通过对弹目相对加速度的盲估计,补偿回波信号中的二次项,使得因弹目相对加速度产生的频谱展宽问题得以解决。补偿后的回波信号相参积累时间得以增加,这使得导引头检测灵敏度随之提高。仿真条件下,此算法将导引头的截获灵敏度提高了12.5dB,作用距离提升一倍有余。此算法还可以推广应用到弹目加加速度或者更高次项存在的情况。
The high speed and high maneuvering stealth aircrafts severely compress the detection power of the radar seeker. It is one of the effective ways to solve this problem by increasing the time of phase-coherent accumulation to improve the sensitivity of the seeker. A long time phase-coherent accumulation algorithm based on instantaneous frequency measurement (IFM) is proposed to detect the stealth target for pulse Doppler radar seeker. This algorithm is applied to the target detection of radar seeker with the mature IFM technology in the field of electronic countermeasures. Through the blind estimation of the relative acceleration between missiles and targets and compensating the quadratic term in the echo signal, the spectrum broadening problem caused by the relative acceleration can be solved. After compensation, the accumulation time of the echo signal is increased, which improves the detection sensitivity of the seeker. By the simulation condition, this algorithm increases the intercept sensitivity of the seeker by 12.5 dB, which means the range is increased by more than one time. This algorithm can also be applied in the situation where higher order accelerated velocity exists.
作者
王卓
郑学合
常晓兰
WANG Zhuo;ZHENG Xuehe;CHANG Xiaolan(Beijing Institute of Remote Sensing Equipment, Beijing 100854, China;Defense Technology Academy of China Aerospace Science and Industry Corporation Limited, Beijing 100854, China)
出处
《系统工程与电子技术》
EI
CSCD
北大核心
2019年第5期1000-1006,共7页
Systems Engineering and Electronics
关键词
长时间相参积累
加速度盲估计
瞬时测频
高机动隐身目标
导引头
long time phase-coherent accumulation
the blind estimation of acceleration
instantaneous frequency measurement (IFM)
high maneuvering stealth target
seeker