In deep space exploration,many engineering and scientific requirements require the accuracy of the measured Doppler frequency to be as high as possible.In our paper,we analyze the possible frequency measurement points...In deep space exploration,many engineering and scientific requirements require the accuracy of the measured Doppler frequency to be as high as possible.In our paper,we analyze the possible frequency measurement points of the third-order phase-locked loop(PLL)and find a new Doppler measurement strategy.Based on this finding,a Doppler frequency measurement algorithm with significantly higher measurement accuracy is obtained.In the actual data processing,compared with the existing engineering software,the accuracy of frequency of 1 second integration is about 5.5 times higher when using the new algorithm.The improved algorithm is simple and easy to implement.This improvement can be easily combined with other improvement methods of PLL,so that the performance of PLL can be further improved.展开更多
针对高速机动目标多普勒频率展宽引起的相参积累散焦损失等问题,提出了易于工程实现的目标回波信号预处理方法。该方法构建了多普勒频移变化与加速度、角速度的关系模型。理论分析和仿真表明:在动目标检测(MTD)中相参积累散焦损失由多...针对高速机动目标多普勒频率展宽引起的相参积累散焦损失等问题,提出了易于工程实现的目标回波信号预处理方法。该方法构建了多普勒频移变化与加速度、角速度的关系模型。理论分析和仿真表明:在动目标检测(MTD)中相参积累散焦损失由多普勒频移变化率等多个因素所决定,其大小在-20lg N dB至0dB之间(N为相参积累的脉冲数)。通过提出的多普勒频移补偿方法,可有效消除多普勒频率展宽对MTD相参积累的影响,提高雷达在复杂杂波背景中对高速机动目标的检测能力。展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.11773060,11973074,U1831137 and 11703070)National Key Basic Research and Development Program(2018YFA0404702)+1 种基金Shanghai Key Laboratory of Space Navigation and Positioning(3912DZ227330001)the Key Laboratory for Radio Astronomy of CAS。
文摘In deep space exploration,many engineering and scientific requirements require the accuracy of the measured Doppler frequency to be as high as possible.In our paper,we analyze the possible frequency measurement points of the third-order phase-locked loop(PLL)and find a new Doppler measurement strategy.Based on this finding,a Doppler frequency measurement algorithm with significantly higher measurement accuracy is obtained.In the actual data processing,compared with the existing engineering software,the accuracy of frequency of 1 second integration is about 5.5 times higher when using the new algorithm.The improved algorithm is simple and easy to implement.This improvement can be easily combined with other improvement methods of PLL,so that the performance of PLL can be further improved.
文摘5G超密集网络(ultra-dense network,UDN)的引入是为了提升吞吐量,特别是针对静态和低速场景,因此,无法同时满足高吞吐量和高移动速度的需求。对于未来需要同时支持高容量和高速移动的6G新场景,提出一种同心圆模型(homocentric sphere model,HSM)的网络架构,采用控制面/用户面数据分离、多发送接收节点(transmission and reception point, TRP)协同传输的方法来处理密集部署网络中多普勒效应影响大和TRP频繁切换的问题,使得该模型成为密集部署网络下提升网络容量、应对高速移动的有效方法。数据结果证明,所提的HSM有效减小了密集组网高速移动场景下多普勒频移效应,同时能够提供更高的网络遍历频谱效率。
文摘针对高速机动目标多普勒频率展宽引起的相参积累散焦损失等问题,提出了易于工程实现的目标回波信号预处理方法。该方法构建了多普勒频移变化与加速度、角速度的关系模型。理论分析和仿真表明:在动目标检测(MTD)中相参积累散焦损失由多普勒频移变化率等多个因素所决定,其大小在-20lg N dB至0dB之间(N为相参积累的脉冲数)。通过提出的多普勒频移补偿方法,可有效消除多普勒频率展宽对MTD相参积累的影响,提高雷达在复杂杂波背景中对高速机动目标的检测能力。
