以全球定位系统(GPS)为代表的全球卫星导航系统(GNSS)广泛应用于民用和军事各个领域,是提供时空信息服务的重要基础。但雷达信号与卫星导航信号频段部分重叠,严重影响卫星导航信号功率较弱的正常接收。为了进一步提高扫描干扰的时域抗干扰能力,本文针对扫描干扰场景,研究了扫描干扰对时域自适应抗干扰的影响,提出了一种基于自适应滤波器的定时复位方法。该方法能有效地解决扫频干扰对时域自适应抗干扰的影响,在抑制干扰的同时实现对信号的保护。仿真实验验证了本文提出的抗干扰方法的有效性。在典型仿真场景下,当定时复位周期为1 m时,扫频干扰对导航信号的影响时间小于1 m,较传统方法显著减小。本文提出的抗干扰方法对于提高卫星导航接收机在扫描干扰情况下的生存能力具有重要意义
《2030年议程》框架为共同制定地方指标提供了机会,并与水-能源-粮食关系具有相同的跨部门一体化和普遍性原则。本研究旨在开发一种定量协作方法,用于构建巴西塞拉多和卡廷加生物群落可持续性的指标和指数,同时考虑到Nexus视角与2030年议程可持续发展目标框架之间的联系和协同作用。这项研究应用于2512个城市,这些城市构成了上述生物群落的总数。该方法由四个主要部分组成:i)在专家组合作的基础上,根据指标与2030年议程的一个或多个目标的关联确定和构建指标;Ii)根据专家为每个指标赋予的目标分配的数量和重要性,通过考虑杠杆的指标生成权重;iii)考虑可持续发展目标的表现,制定可持续发展目标指标;Nexus性能,考虑到可持续发展目标之间的不同权重;Nexus协同,可持续发展目标之间的标准差;Nexus总体上是后两者的结合;考虑到治理指标赋零值,对绩效指标进行敏感性分析。 In general, the regions of MATOPIBA, northern and western of Cerrado and the Caatinga, are, on average, the areas of greatest vulnerability. The targets that respond to this inequality are related to eradicating hunger, sustainable and climate-resilient production systems, universal access to water, water quality, efficiency of multiple water uses, access to energy, and the participation of renewable energies. We found that in areas of better average nexus performance, there is also greater inequality between nexus dimensions; therefore, the Nexus overall index is penalized. The federal units and areas with the worst Nexus dimension performances and with insufficient governance measures are north and northwest of Bahia and municipalities bordering the State of Tocantins—food; Maranhão and Piauí, northeast of Mato Grosso, northwest of Goiás, Rio Grande do Norte and Paraíba—water; and Maranhão, extreme southeast of Pará, and more sparsely in Paraíba—energy.