由于GDOP(geometric dilution of precision)的影响,MLAT系统的定位噪声与目标几何位置有关,这将造成传统检验方法的性能下降。针对该问题,作者提出了一种应用于机场场面MLAT监视系统的目标静止/运动状态检验方法。通过所构造的归一化...由于GDOP(geometric dilution of precision)的影响,MLAT系统的定位噪声与目标几何位置有关,这将造成传统检验方法的性能下降。针对该问题,作者提出了一种应用于机场场面MLAT监视系统的目标静止/运动状态检验方法。通过所构造的归一化检验量,该方法可消除GDOP对检验性能的影响。所提方法的检验原理如下:当目标处于静止状态时,所构造的归一化检验量是中心化的Chi分布;当目标处于运动状态时,所构造的归一化检验量为非中心化的Chi分布。一种对应的滑动窗口检验方法被同时提出以便满足不同的性能要求。所提出方法经过了严格的理论推导和性能分析,并通过仿真实验证明了其有效性和合理性。该方法已在某机场实现了工程应用。展开更多
At the World Economic Forum Annual Meeting 2026 in Davos,China emerged as a steadfast advocate for multilateral cooperation and constructive dialogue,presenting a clear alternative to divisive rhetoric.CHINA’S role a...At the World Economic Forum Annual Meeting 2026 in Davos,China emerged as a steadfast advocate for multilateral cooperation and constructive dialogue,presenting a clear alternative to divisive rhetoric.CHINA’S role as a key player in shaping global development and trends stood out at the World Economic Forum(WEF)annual meeting 2026 in Davos,Switzerland.展开更多
As we enter the year 2026,the international system continues to receive shocks from Donald Trump,arguably the 21st century’s most disruptive US leader.His return to the White House in 2025 coincided with the 80th ann...As we enter the year 2026,the international system continues to receive shocks from Donald Trump,arguably the 21st century’s most disruptive US leader.His return to the White House in 2025 coincided with the 80th anniversary of the defeat of fascism and the establishment of the United Nations,the multilateral platform that carried the world’s hope for peace,restraint and collective security.The coincidence was unsettling.A world order designed to limit power now confronts a moment in which power is exercised openly,transactionally and unapologetically.展开更多
简述了组成MLAT系统的远端基站、校标系统、地面中心站及飞行动态显示系统,对MLAT的关键技术TDOA(Time Difference of Arrival,到达时间差)及MLAT系统的其他关键技术如到达信号边沿检测、时钟同步、几何精度因子(DOP)以及接收机布站优...简述了组成MLAT系统的远端基站、校标系统、地面中心站及飞行动态显示系统,对MLAT的关键技术TDOA(Time Difference of Arrival,到达时间差)及MLAT系统的其他关键技术如到达信号边沿检测、时钟同步、几何精度因子(DOP)以及接收机布站优化问题进行了剖析,并对MLAT系统的应用进行了分析。展开更多
Due to the particularity of its location algorithm,there are some unique difficulties and features regarding the test of target motion states of multilateration(MLAT)system for airport surface surveillance.This paper ...Due to the particularity of its location algorithm,there are some unique difficulties and features regarding the test of target motion states of multilateration(MLAT)system for airport surface surveillance.This paper proposed a test method applicable for the airport surface surveillance MLAT system,which can effectively determine whether the target is static or moving at a certain speed.Via a normalized test statistic designed in the sliding data window,the proposed method not only eliminates the impact of geometry Dilution of precision(GDOP)effectively,but also transforms the test of different motion states into the test of different probability density functions.Meanwhile,by adjusting the size of the sliding window,it can fulfill different test performance requirements.The method was developed through strict theoretical extrapolation and performance analysis,and simulations results verified its correctness and effectiveness.展开更多
文摘由于GDOP(geometric dilution of precision)的影响,MLAT系统的定位噪声与目标几何位置有关,这将造成传统检验方法的性能下降。针对该问题,作者提出了一种应用于机场场面MLAT监视系统的目标静止/运动状态检验方法。通过所构造的归一化检验量,该方法可消除GDOP对检验性能的影响。所提方法的检验原理如下:当目标处于静止状态时,所构造的归一化检验量是中心化的Chi分布;当目标处于运动状态时,所构造的归一化检验量为非中心化的Chi分布。一种对应的滑动窗口检验方法被同时提出以便满足不同的性能要求。所提出方法经过了严格的理论推导和性能分析,并通过仿真实验证明了其有效性和合理性。该方法已在某机场实现了工程应用。
文摘At the World Economic Forum Annual Meeting 2026 in Davos,China emerged as a steadfast advocate for multilateral cooperation and constructive dialogue,presenting a clear alternative to divisive rhetoric.CHINA’S role as a key player in shaping global development and trends stood out at the World Economic Forum(WEF)annual meeting 2026 in Davos,Switzerland.
文摘As we enter the year 2026,the international system continues to receive shocks from Donald Trump,arguably the 21st century’s most disruptive US leader.His return to the White House in 2025 coincided with the 80th anniversary of the defeat of fascism and the establishment of the United Nations,the multilateral platform that carried the world’s hope for peace,restraint and collective security.The coincidence was unsettling.A world order designed to limit power now confronts a moment in which power is exercised openly,transactionally and unapologetically.
文摘简述了组成MLAT系统的远端基站、校标系统、地面中心站及飞行动态显示系统,对MLAT的关键技术TDOA(Time Difference of Arrival,到达时间差)及MLAT系统的其他关键技术如到达信号边沿检测、时钟同步、几何精度因子(DOP)以及接收机布站优化问题进行了剖析,并对MLAT系统的应用进行了分析。
基金supported by the National Science and Technology Pillar Program of China (No.2011BAH24B06)the National Nature Science Foundation of China+1 种基金Chinese Civil Aviation Jointly Funded Foundation Project (No.U1433129)the Sichuan Provincial Department of Education Foundation(No.13ZB0287)
文摘Due to the particularity of its location algorithm,there are some unique difficulties and features regarding the test of target motion states of multilateration(MLAT)system for airport surface surveillance.This paper proposed a test method applicable for the airport surface surveillance MLAT system,which can effectively determine whether the target is static or moving at a certain speed.Via a normalized test statistic designed in the sliding data window,the proposed method not only eliminates the impact of geometry Dilution of precision(GDOP)effectively,but also transforms the test of different motion states into the test of different probability density functions.Meanwhile,by adjusting the size of the sliding window,it can fulfill different test performance requirements.The method was developed through strict theoretical extrapolation and performance analysis,and simulations results verified its correctness and effectiveness.
