雷达目标识别是弹道防御阶段的关键环节,为节约雷达时间资源和降低对计算机处理能力的要求,需研究低数据率雷达回波信号的弹道中段目标识别方法,本文以低数据率目标高分辨一维距离像序列(High Resolution Range Profile,HRRP)为研究对象...雷达目标识别是弹道防御阶段的关键环节,为节约雷达时间资源和降低对计算机处理能力的要求,需研究低数据率雷达回波信号的弹道中段目标识别方法,本文以低数据率目标高分辨一维距离像序列(High Resolution Range Profile,HRRP)为研究对象,提出了基于图像投影法的进动频率特征提取算法和基于特征级融合的弹道中段目标识别方法,解决了由于HRRP回波序列数据率过低而导致的时频曲线周期模糊和单一特征造成目标识别准确率浮动大的问题。本文通过仿真弹道导弹中段飞行场景中弹头、重诱饵、轻诱饵、碎片目标的特性数据,同时考虑目标尺寸、形状和微运动模型等差异,结合仿真数据对本文所提算法进行验证。实验结果表明在低数据率(10~100 Hz)下,HRRP序列利用本文算法提取的进动频率特征结果误差值小于0.05 Hz,具有较高准确性和稳定性,通过特征融合方法联合进动频率和目标结构特征将弹道中段目标的识别准确率提升到了96%以上且趋于稳定。展开更多
Human body communication is proposed as a promising body proximal comanunication tech- nology for body sensor networks. To achieve low power and slmll volume ill the sensor nodes, a Ra-dio Frequency （RF） application...Human body communication is proposed as a promising body proximal comanunication tech- nology for body sensor networks. To achieve low power and slmll volume ill the sensor nodes, a Ra-dio Frequency （RF） application-specific integrated circuit transceiver tbr Human Body Commnunication （HBC） is presented and the characteristics of HBC are investigated. A high data rate On-Off Keying （OOK）/Frequency-Shift Keying （FSK） modulation protocol and an OOK/FSK delrodulator circuit are introduced in this paper, with a data-rate-to-carrier-frequency ratio up to 70%. A low noise amplifier is proposed to handle the dynamic range problem and improve the sensitivity of the receiver path. In addi-tion, a low power autonmatic-gain-control system is realized using a novel architecture, thereby render-ing the peak detector circuit and loop filter unneces-sary. Finally, the complete chip is fabricated. Simula-tion results suggest receiver sensitivity to be-75 dBm. The transceiver shows an overall power con-smxption of 32 mW when data rate is 5 Mbps, de-livering a P1dB output power of - 30 dBm.展开更多
基金This study was supported partially by the Projects of National Natural Science Foundation of China under Crants No. 60932001, No.61072031 the National 863 Program of China un-der Crant No. 2012AA02A604+3 种基金 the National 973 Program of China under Cwant No. 2010CB732606 the Next Generation Communication Technology Major Project of National S＆T un-der Crant No. 2013ZX03005013 the ＂One-hundred Talent＂ and the ＂Low-cost Healthcare＂ Programs of Chinese Academy of Sciences and the Guangdong Innovation Research Team Funds for Low-cost Healthcare and Irrage-Guided Therapy.
文摘Human body communication is proposed as a promising body proximal comanunication tech- nology for body sensor networks. To achieve low power and slmll volume ill the sensor nodes, a Ra-dio Frequency （RF） application-specific integrated circuit transceiver tbr Human Body Commnunication （HBC） is presented and the characteristics of HBC are investigated. A high data rate On-Off Keying （OOK）/Frequency-Shift Keying （FSK） modulation protocol and an OOK/FSK delrodulator circuit are introduced in this paper, with a data-rate-to-carrier-frequency ratio up to 70%. A low noise amplifier is proposed to handle the dynamic range problem and improve the sensitivity of the receiver path. In addi-tion, a low power autonmatic-gain-control system is realized using a novel architecture, thereby render-ing the peak detector circuit and loop filter unneces-sary. Finally, the complete chip is fabricated. Simula-tion results suggest receiver sensitivity to be-75 dBm. The transceiver shows an overall power con-smxption of 32 mW when data rate is 5 Mbps, de-livering a P1dB output power of - 30 dBm.
