VHF航空信道下一种多机协作通信新方法-《郑州大学学报(工学版)》

文章信息/Info

Title:: Rapid Determination of Lead，Manganese，and Iron in Gasoline withAtomic Absorption Spectrophotometry

Author(s):: YANG Zhi-ling; Henan Provice Product Quality Supervision and Inspection Center,Zhengzhou 450004, China

Keywords:: atomic absorption spectrophotometer; gasoline; lead; manganese; iron

摘要:: 针对航空通信中各种干扰导致的高误码率问题,对有无直接链路的情形分别提出多机协作通信提高分集增益的方法.该方法在机载通信设备调制技术和发射功率不变的条件下实现了高速率传输,有效抵抗多径衰落,扩大通信范围.通过分析VHF信道中是否存在直接链路,给出了基于航空信道模型的放大转发和解码转发协作通信方式,用最大比合并的方法提高了接收端的信噪比.仿真结果表明,在给定的空空和空地信道参数下,在直接链路存在下多机DF协作的误码性能最优,在无直接链路存在下多机AF协作的误码性能最优.

Abstract:: Abstract: An atomic absorption spectrophotometry method for the determination of Pb，Mn，and Fe in motorgasoline was studied. Digestion method for pretreatment of samples was proposed. And comparison of methodbetween this work and national standard was carried out.The results showed that the linear relation betweenabsorbance and ion concentration were good in the range of 0 ~4 mg ·L-’. The correlation coefficients wereall more than 0.999.The detection limit of Pb，Mn，and Fe which were all lower than the quantitative lowerlimits of national standard were 0.023 mg · L ’,0.068 mg · L’， and 0.012 mg ·L ’ , respectively.Theaverage error and relative standard deviation of measurement were all lower than 0.02 which showed that thep-recision and accuracy of this method is satisfied. The values of recovery of Pb，Mn， and Fe were in the rangeof 92.5% ~98.1% ,95.6% ~106.2% , and 96.8% ~107.1 % , respectively. It showed that the recovery ishigh and the method is accurate.The content of Pb，Mn，and Fe in five kinds of motor gasoline were deter-mined by methods of this work and national standard with an average error lower than 3. 5% which showed thatthe method is reliable.