Approach for space-based radar manoeuvring target detection and high-order motion parameter estimation
Approach for space-based radar manoeuvring target detection and high-order motion parameter estimation
复制标题
天基雷达机动目标检测与高阶运动参数估计方法
DOI：
10.1049/iet-rsn.2014.0192
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发表时间：
2015-06
影响因子：
1.7
通讯作者：
Du Wentao
中科院分区：
文献类型：
--
作者：
Huang Penghui;Liao Guisheng;Yang Zhiwei;Shu Yuxiang;Du Wentao
由于天基雷达的微弱能量和机动运动，对机动目标的检测是一项具有挑战性的任务。延长积分时间是增加信号能量的有效方法，可以提高目标检测性能。然而，随着积分时间的增加，机动目标的径向速度、径向加速度和径向加速度率会引起回波信号的线性距离走动、二次距离曲率、二次距离曲率和多普勒频率漂移，从而降低目标检测性能。为了解决这个问题，提出了一种新的方法，实现了参数分离变换分离的加速度。然后，利用Hough变换和三阶Keystone变换对线性偏移和距离偏移进行补偿，通过一维搜索得到速度和加速度。该方法利用方位慢时间的对称性，将距离压缩后的距离频域数据与时间反演后的距离频域数据相乘，分离出加速度;利用三阶Keystone变换校正距离曲率。仿真结果表明，该方法能有效地估计机动目标的径向速度、径向加速度和径向加速度率，从而实现信号能量的精细积累。
The detection of manoeuvring target for space-based radar is a challenging task because of its weak energy and manoeuvring motion. Prolonging the integration time is an effective method to increase signal energy, which can improve the target detection performance. However, with the increase of integration time, the radial velocity, radial acceleration and radial acceleration rate of manoeuvring target will induce linear range walk, quadratic-range curvature, cubic-range curvature and Doppler frequency migration of echo signal, which may degrade the performance of target detection. To solve this problem, a novel method is proposed that implements a parameter separation transform to isolate the acceleration. Then, the velocity and the acceleration rate can be obtained via one-dimensional search after the compensation of linear and cubic-range migration based on Hough transform and third-order Keystone transform. The kernel steps are as follows: (i) the acceleration is isolated by multiplying the range-compressed data in range frequency domain by its time-reversed data according to the symmetrical property of azimuth slow time; (ii) the cubic-range curvature is corrected by a third-order Keystone transform. The simulation results demonstrate the effectiveness of the proposed method in estimating radial velocity, radial acceleration and radial acceleration rate of a manoeuvring target, thereby the signal energy can be finely accumulated.
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