基于数字波束扫描定位技术的非线性节点探测器

Nonlinear junction detector based on digital beam scanning orientation technology

文中提出一种对非线性目标进行实时大角度定位的非线性节点探测器,利用4×4天线单元实现数字波束形成及不同的波束方位指向,可在较大范围得到探测目标的粗定位;并通过水平与垂直方向的双基线四接收通道来计算回波相位差,得到探测目标的细定位。文中通过创新性地异构FPGA,实现探测器信号处理单元集成数字波束扫描和比幅-比相复合测向的非线性目标实时探测方案,能够在保证实时性的基础上,解决相位法测向过程中相位模糊的问题,并提高探测器的探测范围以及探测目标的定位精度。所提出的探测器具有16组发射4接收通道,扫描范围为±45°,探测灵敏度大于-125 dBm,扫描定位时间为100 ms。整机具备可视化人机交互界面且重量仅3 kg,能很好地满足手持式非线性节点探测的市场需求。

A nonlinear junction detector for real-time and large-angle positioning of nonlinear target is proposed in this paper.The 4×4 antenna unit is used to implement digital beamforming and different beam-pointing,and the coarse positioning of the detected target can be obtained in a larger range.The dual baseline 4 receiving channels in horizontal and vertical directions can be used to calculate the echo phase difference to obtain the fine positioning of the detected targets.By means of innovative heterogeneous FPGA,the real-time nonlinear target detection scheme with integrating digital beam scanning and amplitude-comparison phase-comparison composite direction-finding of the detector signal processing unit is realized,which can solve the phase ambiguity in the direction-finding process of phase method on the basis of ensuring real-time performance and improve the detection range of the detector and the positioning accuracy of the detected target.The proposed detector has 16 transmitting and 4 receiving channels,its scanning range is±45°,its detection sensitivity is greater than-125 dBm,and its scanning positioning time is 100 ms.The complete detector has a visual human-computer interaction interface and weighs only 3 kg,which can well meet the market demand for handheld nonlinear junction detection.