Keystone变换半盲速点效应的抑制和消除
doi: 10.3724/SP.J.1146.2013.00490
The Suppression and Elimination of Half Blind Velocity Effect Associated with Keystone Transform
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摘要: Keystone变换可用于补偿运动目标在脉冲多普勒(PD)雷达相参积累时间内的线性跨距离单元走动，但在多普勒模糊情况下，常规Keystone变换实现方法会出现半盲速点效应。该文分析了半盲速点效应产生的原因，并介绍了已有的半盲速点效应消除方法。为减少运算量，首先提出一种半盲速点效应抑制方法，并在此基础上提出了一种新的半盲速点效应消除方法。新方法能够对感兴趣的某个多普勒模糊区间内的所有速度目标的线性距离走动较好地进行补偿，而运算量约为已有方法的50%。理论分析和仿真结果均证明了所提方法的有效性。
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关键词:
- 脉冲多普勒雷达 /
- Keystone变换 /
- 多普勒模糊 /
- 半盲速点效应
Abstract: Keystone transform can be employed to eliminate the effects of linear range migration through resolution cells of moving targets during the coherent integration time of Pulse Doppler (PD) radar. However, with Doppler ambiguity, Half-Blind-Velocity Effect (HBVE) occurs when the conventional implementation method of keystone transform is applied. The causes of HBVE are analyzed, and the existing elimination methods of HBVE are introduced. To decrease the computation cost, a method to suppress HBVE is firstly presented, on the basis of which a new method of HBVE elimination is put forward. The proposed method can remove the linear range migration of moving targets with all possible velocities within a desired ambiguous Doppler interval, and its computation cost is reduced by almost 50% compared to the existing one. Theoretical analysis and simulation results validate the effectiveness of the presented methods. -
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