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 Spread spectrum code, also known as ranging code or pseudo-random noise code. It has been extensively studied and its application has rapidly expanded with the development of its research. In addition to its applications in communications, radar, navigation and cryptography, it has also been applied in the field of automatic control, computer, acoustics and optics measurement, Digital tracking, frequency measurement and digital network and so on. What we study here is the pseudo-random sequence (m-sequence) of the longest period. And its short cut m sequence. Detailed analysis