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Keystone变换常常用于校正运动目标在脉冲多普勒雷达相参积累时间内的距离走动,提高回波信号的信噪比。但是常规Keystone变换应用于高速目标会存在两方面问题,首先常规Keystone变换引入插值增加了运算负担,其次若存在多普勒模糊,常规Keystone变换实现方法会出现“半盲速点”效应。文中提出了基于尺度变换的Keystone变换方法,新方法可以明显减少运算量,减小了带宽对多普勒模糊的影响,抑制了“半盲速点”效应,提高了相参积累效果。
The Keystone transform is often used to correct the moving distance of the moving target during the coherent integration time of the pulse Doppler radar and improve the signal-to-noise ratio of the echo signal. However, the application of conventional Keystone transform to high-speed target has two problems. Firstly, the interpolation of conventional Keystone transform increases the computational load, and secondly, if there is Doppler ambiguity, the conventional Keystone transform method has the effect of semi-blind speed point. In this paper, Keystone transform method based on scale transformation is proposed. The new method can reduce the computational complexity significantly, reduce the effect of bandwidth on Doppler ambiguity, suppress the effect of semi-blind velocity point and increase the effect of coherent integration.