基于线性拟合的包络走动补偿方法

在低信噪比情况下,信号长时间能量积累是检测目标的一种手段。对于长时间能量积累,系统往往面临3个问题,即距离走动、多普勒漂移、波束跨越。信号处理时,必须首先把所有目标回波包络都校正到同一距离单元上,然后利用动目标检测(MTD)或者联合时频变换等方法来完成回波能量积累和检测。通常Keystone变换是完成距离走动补偿的一种有效方法,但其计算量较大,实时性差。提出了一种基于线性拟合的距离走动补偿算法,利用曲线拟合的思想来完成包络走动补偿,仿真结果验证了该方法的有效性,同时表明其具有更好的实时处理性能。

Envelope Remotion Compensation Method Based on Linear Fitting

The signal energy accumulation for long time is a means to detect targets in the circumstances of low signal noise ratio(SNR).For long time energy accumulation,the system is usually confronted with three problems:distance remotion,Doppler shift,beam across.When the signal is being processed,firstly all target echo envelopes must be corrected to the same distance unit,then the moving target detection(MTD) or the joint time-frequency conversion method,etc.are used to finish the echo energy accumulation and detection.Usually,Keystone conversion is an effective method to finish the distance remotion compensation,but the calculation quantity is large and the real-time performance is bad.This paper presents a distance remotion compensation algorithm based on linear fitting,which uses the curve fitting idea to perform the envelopment remotion compensation,the simulation results verify the validity of the method,at the same time show that the method has better real-time processing performance.