小波尺度投影多普勒容限提升制导算法改进

Improved Algorithm of Wavelet Scale Projection Doppler Tolerance Enhance Guidance

在航行器制导系统设计中,多普勒容限是系统设计的重要波形参数,多普勒宽容性有利于提高目标检测性能和减少设备复杂性。传统的设计方案采用双曲调频小波的自小波变换进行多普勒容限提升,当双曲调频小波出现时间尺度耦合时,产生相似结构包络平移,检测性能无法满足制导系统设计需求。提出一种改进的基于连续小波变换尺度投影算法的多普勒容限提升算法,进行制导系统设计改进,设计目标回波的宽带模型,根据选择性衰落失真模拟接收信号,构建双曲调频小波制导检测器,降低算法复杂度。实验结果表明,该算法能提升多普勒的宽容性,有效完成低信噪比下的弱信号检测,提高航行设备的制导性能,满足现有航行器制导系统的战术要求。

In the design of vehicle guidance system, the Doppler tolerance is an important parameter of system design, andthe Doppler tolerance can improve the target detection performance and reduce the complexity of equipments. The tradition.al hyperbolic frequency modulation wavelet method has similar structure envelope migration, so detection performance can.not meet the demand of the design guidance system. A improve Doppler tolerance algorithm is proposed based on continu.ous wavelet transform scale projection algorithm, guidance system design is improved, and wideband model of target echo isdesigned. According to the selective fading distortion, the analog received signal is obtained, the hyperbolic frequency mod.ulation wavelet guidance detector is constructed, and the complexity of the algorithm is reduced. The experimental resultsshow that, the algorithm can improve the tolerance of Doppler, the weak signal detection is effectively completed under lowsignal to noise ratio, improve the performance of guidance navigation equipment, it meets the tactical requirements of exist.ing vehicle guidance system.