原子吸收法快速测定汽油中的铅、锰和铁-《郑州大学学报(工学版)》

文章信息/Info

Title:: A New Method for Multi-Aircraft Cooperative Communicationin the VHF Aeronautical Channel

Author(s):: WANG Zhong-yong’; DANG Gang’ ; YUAN Hong-boZHANG Da-peng’; ( 1.School of Information Engineering, Zhengzhou University , Zhengzhou 450001 , China; 2. Department of Aeronautic ElectronicEngineering，The First Aeronautical College of Air Force，Xinyang 464000，China)

Keywords:: aeronautical channel; amplify-and-forward (AF ) ; decode-and-forward (DF ); multi-aircraft co-operative communication

摘要:: 采用原子吸收法测定汽油中的铅、锰、铁,提出消解预处理样品,并与国标方法进行了比较.结果表明:铅、锰、铁含量在0～4 mg·L-1范围内线性关系良好,相关系数均大于0.999.铅、锰和铁的检出限分别为:0.023 mg·L-1、0.068 mg·L-1和0.012 mg·L-1,均远低于国家标准的定量下限.重复性实验得到铅、锰和铁的测量平均误差和相对标准偏差均低于0.02,方法的精密度好.样品加标回收实验得到铅、锰和铁的加标回收率分别为:92.5％～98.1％、95.6％～ 106.2％和96.8％～107.1％,回收率高、方法的准确度高.

Abstract:: In view of the high BER (Bit Error Rate ) caused by a variety of interference in the aeronauticalcommunications， this paper proposes the multi-aircraft cooperative communication scheme for the case that adirect link does or doesn ’t exist separately to improve the diversity gain in aeronautical channel.The proposedscheme could achieve high data rate，effectively resist multi-path fading， and expand the communication rangein conditions of fixed airborne communication equipment modulation and constant transmission power. By ana-lyzing whether there is a direct link for transmitting signals in VHF channel,we give both the amplify-and-for-ward and decode-and-forward cooperative communication mode based on the model of aeronautical channel.What ’s more，the maximum ratio combining method is utilized to improve the SNR ( Signal to Noise Ratio) atthe receiving end. Simulation results show that the multi-aircraft DF has optimal performance of BER when di-rect link exists , and the multi-aircraft AF has optimal performance of BER when direct link does not exist,when the parameters of air-to-air and air-to-ground channels are given.