[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fBPWEQ7KsMMhMNOGN4Piborm5xRAa3Duuz-wZYmgFgXc":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":8,"question":15,"related":16,"source":27,"type":78},[],"2026-03-30 16:30:19",331577937,[],{"count":9,"courseId":10,"courseImg":11,"courseName":12,"workId":13,"workName":14},17,"53e1d2ef4961cca8eea3e23969ad2cb9","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F03a579384a6dc297c89809b582fcc767.png","默认课程","work_50837447","3.5窄带随机过程","正弦波加窄带高斯噪声的包络服从______分布,当正弦波幅度为0时退化为瑞利分布",[17,29,38,47,56,65,75,79,84,94],{"answer":18,"createTime":19,"id":20,"options":21,"question":26,"source":27,"type":28},[],"2026-03-23 18:20:02",327316635,[22,23,24,25],"E[I(t)]=0,E[Q(t)]≠0","E[I(t)]≠0,E[Q(t)]=0","E[I(t)]=0,E[Q(t)]=0","E[I(t)]≠0,E[Q(t)]≠0","若窄带随机过程r(t)的均值为0,则其同相分量I(t)和正交分量Q(t)的均值满足( )","v1",0,{"answer":30,"createTime":19,"id":31,"options":32,"question":37,"source":27,"type":28},[],327316636,[33,34,35,36],"振幅调制分量和相位调制分量","包络和相位","同相分量和正交分量","基带信号和载波信号","窄带随机过程的一般表达式可写为r(t)=a(t)cos(ω₀t+φ(t)),其中a(t)和φ(t)分别称为( )",{"answer":39,"createTime":19,"id":40,"options":41,"question":46,"source":27,"type":28},[],327316637,[42,43,44,45],"瑞利分布","莱斯分布","均匀分布","指数分布","正弦波Acos(ω₀t+θ)加窄带高斯噪声n(t)=n_I(t)cosω₀t - n_Q(t)sinω₀t的合成信号为r(t)=[Acosθ+n_I(t)]cosω₀t - [Asinθ+n_Q(t)]sinω₀t,其包络a(t)的概率密度函数服从( )",{"answer":48,"createTime":19,"id":49,"options":50,"question":55,"source":27,"type":28},[],327316638,[51,52,53,54],"功率谱密度集中在零频率附近","功率谱密度带宽远小于载波频率","功率谱密度带宽等于载波频率","功率谱密度带宽大于载波频率","窄带随机过程的功率谱密度通常满足以下哪个条件",{"answer":57,"createTime":19,"id":58,"options":59,"question":64,"source":27,"type":28},[],327316639,[60,61,62,63],"I(t)和Q(t)是相关的高斯过程","I(t)和Q(t)是独立的高斯过程,且方差相等","I(t)和Q(t)是非高斯过程","I(t)的方差大于Q(t)的方差","窄带高斯随机过程的同相分量I(t)和正交分量Q(t)满足以下哪个性质",{"answer":66,"createTime":19,"id":67,"options":68,"question":73,"source":27,"type":74},[],327316640,[69,70,71,72],"同相分量I(t)和正交分量Q(t)均为高斯过程","I(t)和Q(t)的方差相等","I(t)和Q(t)互不相关","r(t)的包络服从高斯分布","窄带高斯随机过程r(t)的统计特性包括以下哪些",1,{"answer":76,"createTime":5,"id":6,"options":77,"question":15,"source":27,"type":78},[],[],2,{"answer":80,"createTime":5,"id":81,"options":82,"question":83,"source":27,"type":78},[],331577938,[],"窄带随机过程是指其功率谱密度集中在某一载波频率f₀附近,且带宽Δf远小于f₀,即满足______条件的随机过程",{"answer":85,"createTime":86,"id":87,"options":88,"question":93,"source":27,"type":28},[],"2026-04-28 09:43:26",353434495,[89,90,91,92],"找到了一条从新民主主义向社会主义过渡的道路,确立了社会主义制度","对适合中国国情的社会主义道路进行了艰苦的探索","把马克思主义中国化,取得新民主主义革命的胜利,建立新中国","积累了经济落后的国家进行社会主义建设的经验","毛泽东最伟大的历史功绩和杰出的贡献是( )",{"answer":95,"createTime":86,"id":96,"options":97,"question":102,"source":27,"type":28},[],353434497,[98,99,100,101],"群众路线","思想路线","工人路线","农民路线","中国共产党的根本工作路线是( )"]