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为了解决传统自适应恒虚警检测器在多目标环境下检测性能下降的问题,对传统基于指数变换的恒虚警检测器 (Variability Index CFAR,VI-CFAR)的选择策略进行改进,提出了一种改进的自适应恒虚警检测器-VIHCES-CFAR。在杂波边缘环境下和多目标干扰环境下分别选择非均匀杂波估计恒虚警检测器 (Heterogeneous Clutter Estimating CFAR,HCE-CFAR)和交互式恒虚警检测器 (Switching CFAR,S-CFAR)进行处理,提高了多目标环境下的目标检测能力,有效避免了目标遮蔽的问题。实验结果表明,在检测概率为0.5的条件下VIHCES-CFAR的信噪比相对于SVI-CFAR低0.05dB,在多目标环境下检测概率为99.78%,在杂波边缘环境下检测概率控制在10-4左右,具有稳定的抗干扰能力和良好的虚警控制能力。并通过实测数据验证了VIHCES-CFAR检测器在解决目标遮蔽问题上的有效性。 相似文献
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为了抑制CDMA800网络下行频段的噪声,利用HFSS和二维电路仿真软件AWR的协同仿真,设计了同轴腔体滤波器,该滤波器利用交叉耦合结构实现了边带外的高抑制性能。所设计滤波器中心频率为875MHz,带宽10MHz;插入损耗〈-0.25dB;回波损耗〉-20dB;带外抑制〉-80dB,满足了设计要求。仿真结果表明:该滤波器结构设计尺寸小、频带宽、带外抑制高、带内插损小等,在通信领域具有良好的应用前景。 相似文献
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设计制作了一款基于微组装工艺的小型化低噪声放大器(LNA)。该器件广泛选用裸管芯、芯片电容等微型器件,采用两级放大电路结构,使用AWR与HFSS电磁仿真软件进行设计、优化和仿真,运用键合金丝微波特性进行噪声系数调试,实现较好的低噪声微波特性。最终实现了在12.25GHz-12.75GHz 工作频段,增益大于20dB,噪声系数小于1.2dB的低噪声放大器,整体电路尺寸仅为12mm×10mm×7mm。 相似文献
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为了检测电动自行车是否超速,本文设计了一种移动电动自行车测速测距系统.该设计采用77 GHz毫米波雷达,在AWR1642采集到回波信号后,在时域上进行FFT,通过计算其相位的变化、CFAR处理、峰值聚集、多普勒补偿等后,得出车辆的距离、速度和行驶角度,并用CAN总线传送数据到上位机,车辆的运动可以在MATLAB的界面进... 相似文献
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D. Suneel Varma Gopi Ram G. Arun Kumar 《International Journal of Communication Systems》2023,36(5):e5419
This paper aims to design a multi-tone radiator exploiting harmonic radiation characteristic of time-modulated antenna array for wireless information and power transmission (WIPT) and multi-operational WIPT receiver. The time-modulated linear antenna array (TMLAA) radiating simultaneously at modulating and harmonic frequencies separated in multiple switching periods is utilized as a multi-tone radiating system. TMLAA with suitable power in harmonic bands generates multi-tone radiation by employing an optimized switching sequence. The ON and OFF time instants of the TMLAA are optimized to suppress sidelobe level and enhance sideband level. A population-based optimization algorithm, teaching learning based optimization (TLBO), is employed to optimize the ON and OFF instants of the TMLAA to suppress sidelobe level and enhance sideband level. TLBO is utilized for a 16-element TMLAA with minimizing cost function to achieve the above objectives. The 16-element TMLAA with optimized switching radiates multi-tone beams with a minimum of 5 dB peak power difference exploited as WIPT. The purpose of multi-operation is accomplished by utilizing the Wilkinson power divider in the receiver system; its power dividing capability is analyzed using applied wave research (AWR). A voltage doubler type rectifier is modeled for DC generation and is tested using AWR. The DC generating capability is tested for fixed power available at various frequencies, and the fixed desired frequency with various available power levels is tested. The results show that the designed circuitry provides a maximum of 80% power conversion efficiency (PCE). 相似文献
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