基于等效和差波束的相控阵雷达宽带信号测角方法

A Wideband Angle-measure Method for Phased Array Radar Based on Equivalent Sum-difference Beam

宽带信号可通过提取目标一维像来支持目标识别等需求,在现代雷达中的作用十分重要。然而,由于多散射点目标的宽带回波特性和相控阵雷达的宽带特性,宽带信号的检测与跟踪一直未能很好地在工程上实现。实际装备的宽带脉冲一般在窄带跟踪脉冲的中间插入。在多目标和宽带需求量大的场景下,这种宽窄交替的调度方式极大增加了雷达的资源消耗,削弱了雷达多目标能力。文中提出了一种基于宽带等效和差波束的相控阵雷达宽带信号测角方法。该方法对宽带信号带内多个频点的接收和差波束做等效拟合,形成等效和差波束,进而通过等效和差波束形成宽带角敏曲线。将该方法应用于某相控阵雷达开展飞机和卫星等实际目标探测,验证了方法的有效性。

Wideband signal plays a very important role in modern radar,which is usually used for high range resolution profile extraction to support target recognition.However,the test and angle measurement of wideband signal still remains a problem in radar industry,due to the characteristics of the echo of multi-scatter target and the characteristics of wideband phased array radar.In real application,the wideband pulses are usually inserted between narrowband tracking pulses.In multi-target scenes,this narrow-widealternating scheduling method causes intense rise of time consumption and sharp decline of multi-target ability.In this paper a new method of wideband angle measurement for phased array radar based on equivalent sum-difference beam is proposed.The equivalent sum and delta beam fitting is obtained with different frequency in the frequency band of wideband signal.The wideband angle sensitive curve is then got from the equivalent sum-difference beam.The new method is applied on real phased array radar to detect airplanes and satellites.The results show that the new method is effective in wideband signal angel measurement.