摘要
雷达信号多脉冲长时间积累是提高雷达检测性能的重要手段。当雷达探测高速运动目标时,目标的径向加速度将引起二次距离走动,使雷达检测性能大大降低。针对此问题,提出一种消除距离走动二阶项的新方法。该方法首先对目标回波进行广义二阶Keystone变换,然后在慢时间域通过解线调的思路估计多普勒调频斜率,进而补偿多普勒高阶项,最后对补偿后信号再进行广义二阶Keystone变换,从而完全消除距离走动。仿真结果证明了该方法的有效性。
The improvement of radar detection performance is commonly realized by the way of multi- pulses long-term accumulation. However, when the radar detects high-speed targets, there will be a seconda- ry range walk caused by radial acceleration, which makes the radar detection performance degrade greatly. To solve this problem, a novel method to eliminate the secondary range walk suggested. First, we employ generalized second order Keystone transform on the echo signal. Then the high order of Doppler frequency is compensated by dechirping. At last, the generalized second order Keystone transform is again used to elimi- nate the secondary range walk completely. Computer simulation results confirm the effectiveness of the pro- posed method.
出处
《雷达科学与技术》
2013年第1期45-50,共6页
Radar Science and Technology
基金
国家自然科学基金(No.61178068)
四川省青年科学基金(No.2011JQ0024)
关键词
高速目标探测
长时间相参积累
跨距离单元走动
广义二阶Keystone变换
high-speed target detection, long-time coherent integration~ walk across range cells~ gener-alized second order Keystone transform
