【摘要】 <正> 扩频码又叫测距码或伪随机噪声码。人们已对它作了广泛的研究,它的应用已随着对其研究发展而迅速扩展,除应用于通信、雷达、导航及密码学外,还应用于自动控制、计算机、声学与光学的测量、数字式跟踪、测频及数字网络等方面。本文所研究的是最长周期的伪随机序列(m序列)。及其短截式m序列。详细分析了更多还原

【Abstract】 Spread frequency code,i.e.ranging code or PRN, has been studied widiy and used in many aspects, which include communication, radar, navigation and cipher, as well as automatic control, computer, acoustics and optics measuring, digital tracking, frequency measuring and digital net etc.. In this paper, the characteristics and generating method of m sequence and shortened m sequence were studied. The characteristic of shortened m sequence and the method of calculating the feedback words and detecting the words were analysed in detail, By means of computer, we got the 756 feedback words and detecting words of shortened m sequence in case of n=14 and we also analysed the code polynomial, histogram, correlation function and feedback words, detecting words of m sequence and shortened code. This analysing software is a complete software package.更多还原