doi:10.1007/978-3-319-94821-8_19Wolfram KahlSpringer, Cham
Alignment:Auto Base Type:Integer Base Type Properties Allow Negative:Auto Analysis Default Sort Property:Ascending Analysis Default Total Property:No Analysis Grouping Property:Auto Analysis Usage Property:None Auto Displace Negative:Auto ID:4742 (non-default) Model:Foundation (non-default) Rotate Sign:A...
checkNoConsumption Method [AX 2012] BOMCalcCheckIndirectCost.checkNoCostPrice Method [AX 2012] BOMCalcCheckIndirectCost.checkUseFallBack Method [AX 2012] BOMCalcCheckIndirectCost.new Method [AX 2012] BOMCalcCheckIndirectCost::construct Method [AX 2012] BOMCalcCheckIndirectCost::newBOMCalcBase Method...
视距条件下,无线信号无遮挡地在发信端与接收端之间直线传播,这要求在第一菲涅尔区(First Fresnel zone)内没有对无线电波造成遮挡的物体,如果条件不满足,信号强度就会明显下降,电磁波多径传播就会产生不良影响,导致通信质量下降,甚至中断通信。 所需的天线高度由障碍物高度决定,并考虑60%的余量以补偿菲涅耳区条件。请保...
菲涅耳区是在收发天线之间,由电波的直线路径与折线路径的行程差为nλ/2的折点(反射点)形成的、以收发天线位置为焦点,以直线路径为轴的椭球面。其中n=1的区域是对信号作主要贡献的区域,称为第一菲涅耳区,亦称有效区。 2、有限区域 当坚硬物体突入菲涅耳区内的信号通道时,锐边衍射就会使部分信号偏转,致使其到达接...
备注:要保证无人机无线图传可靠传输度98%,一般要留17dB的裕量。 -空中损耗:(dB) -接受信号强度:(dBm) -链路余量:(dB) 频率MHz 距离km 发射天线增益dBi 接受天线增益dBi 发射线损dB 接受线损dB 发射功率dBm 接受灵敏度dBm 联系信息 手机/微信:吕晓星 158-1140-9609 / 李朝辉 166-1988-5624 / 王先生 166...
视距传播距离=4.12×(√发射天线高度+√接收天线高度)。 例如,发射塔相对地面平均海拔高度的绝对差为150米,发射天线安装高度为10米,无人机飞行高度500米,则计算公式如下:无线电视距极限传播距离=4.12×(√160+√500)=144.24KM。则无人机有效直视通信距离约为 Re = 100KM。
WolframKahlW. Kahl. The teaching tool CalcCheck a proof-checker for Gries and Schneider's "logical approach to discrete math". In J.-P. Jouannaud and Z. Shao, editors, Proc. of CPP'11, volume 7086 of LNCS, pages 216-230. Springer, 2011....
The article reports on the findings of the study conducted by the researchers of the University of Bristol's Center for Academic Primary Care which found out that men with mild hypercalcaemia had 11.5 percent risk of developing ...
Check drawn from Union National Bank payable to W. R. Calcord for the amount of $87.50 from the account of Babbitt Bros., dated August 31, 1886.Babbitt Brothers Trading Company