【作者】 王乐强；

【导师】 谭建豪；

【作者基本信息】 湖南大学 ， 控制科学与工程， 2009， 硕士

【摘要】 随着当今科技的发展,伪随机广谱复合频率信号源得到越来越广泛的应用。伪随机多频信号含有多种频率,它既具有某种随机波形的特征,又可重复产生,而且信号带宽可控,其能量集中在数个对数坐标上呈等间距分布的频率上,广泛应用于地球物理的电法勘探,无线电测量、机械在线故障检测及建筑物质量检测等方面。针对近年来农业生产和粮食储备中日益严重的鼠害问题,提出了一种用伪随机广谱复合频率电流信号,通过电磁辐射器产生的伪随机无定向旋转电磁场驱灭鼠的新技术,设计了一套能在大、中型粮库中应用的伪随机无定向旋转电磁场辐射驱灭鼠系统。以改变传统药物灭鼠危害大,容易造成环境污染和危害其他生物的缺点以及其他驱灭鼠方法的局限性。在设计中首先分析研究了伪随机多频信号理论,根据其特点得出了伪随机多频波在时间域上的表达式,在此基础上导出了伪随机多频信号的频率域表达式,对比普通方波频率和功率分配,证明了其能量分布集中在数个在对数坐标上呈等间距分布的频率上,并且其带宽可控,具有广谱的性质,该合成信号源较好的解决了多种频率同步发送时能量不平衡、相位不同步的技术难题,在许多的应用中都是非常理想的信号源。综合生物实验和流行病学调查得到的数据,详细介绍了基于伪随机广谱复合频率信号合成技术的伪随机无定向电磁场驱灭鼠系统和极低频电磁辐射装置。最后对整个系统进行了调试,通过实验验证了系统产生的复合频率的波形达到了很好的效果,在电磁辐射装置上也产生了达到要求的电磁场,整个系统已进行实际应用,该技术有着广泛的应用前景,值得进一步的研究。更多还原

【Abstract】 Along with the development of technology, pseudo-random and broad-spectrum complex-frequency signals is getting more and more application. The pseudo-random multi-frequency signal containing several kinds of frequency signals, it has the characteristics of a random waveform and can be reproduced,then bandwidth can be controlled. Its energy concentrated in a few equidistant distribution frequency on logarithmic coordinates.The signal used widely in radio measurement,geophysical electrical prospecting, machinery online fault detection, building quality inspection and other aspects.Considering the increasingly serious rodent problem in agricultural production and food reserves. This paper presents a compound with broad-spectrum pseudo-random frequency current signal, through the electromagnetic radiation generated Pseudo-random non-directional rotating electromagnetic field. And develop a set of extremely low frequency electromagnetic field radiation control system, that is applicable of large and medium-sized grain depot to expel and eradicate rodents. It could avoid the environment pollution and the negative impact to other organisms that traditional rodents control method bring on.In the study of pseudo-random multi-frequency signal,based on characteristic of pseudo-random multi-frequency signal, the expression of pseudo-random multi-frequency signal in time domain and frequency domain is found. By comparing the spectrum and power distribution of pseudo-random multi-frequency signal and square wave, the advantage of pseudo-random multi-frequency signal as high work productivity, high power supply utilization ratio. It is a good solution to energy imbalance, phase synchronization when sending composite frequency pluse. It’s a ideal wavefonn for many application.Combination the measured data of biological experiment and epidemiological investigation, the pseudo-random astatic rotary electromagnetic field expelling and eradicating rodents based on Integration Technology of Broad-spectrum of pseudo-random multi-frequency signal presented in detail.Finally, debugging the whole system. The experiments shows the synthesis signal arrive at good results. The radiation also generated the demanded electromagnetic field. The entire system has been carried out in practical applications, the technology has a wide application prospect, it is worth further study.更多还原