code n. 1.法典;法规。 2.规则,准则;(社会、阶级等的)惯例,习俗,制度。 3.(电)码,代码,密码,暗码;代号,略号,暗号。 4.【生物学】遗传(密)码。 the civil [criminal] code民[刑]法典。 the moral code道德准则。 code of signals 信号密码(本)。 code of the school 校规。 code and conventions 规章制度。 C- Napoléon 拿破仑法典。 C- of Hammurabi (古代巴比伦的)汉穆拉比法典。 code of honour 社会礼法;决斗惯例。 code of written law 成文法典。 the International Code 国际电码。 the Morse code 摩尔斯电码。 vt. 1.把…编成法典[法规]。 2.把…译成[编成]电码;编(码);译(码)。 n. -r 【自动化】编码装置;【电讯】记发器。
The sidelobes characters of the pn codes modulated by signals are discussed taken m-sequence and kasami sequence as examples in this dissertation . it can raise the mainlobe-sidelobes ratio when the initial phase is properly chosen . the mainlobe-sidelobes ratio can even be further improved when mismatched filters are adopted 本文第二章从国防重点型号装备研制项目“北斗一号”用户机的应用需求,以m序列和kasami码为例,研究了有符号调制的伪随机序列的旁瓣特性,指出通过选择合适的伪随机序列的调制初相,可以明显的改善主旁瓣比;失配接收可以进一步提高主旁瓣比。
This article analyses the signal characteristics of several typical cw radars, and presents the principle and application of doppler radar . as one focal point, this article researches the generation and math characteristics of pseudorandom code modulated signal, analyses the spectrum of pseudorandom code phase modulation radar signal, and presents this kind of signal's application in distance and speed measurement . this article also researches the application of mono-pulse amplitude comparison radar in angle measurement finally, this article elaborates the working process of crs in uast 本文分析了几种典型的连续波雷达信号的特性,介绍了多普勒雷达的原理和应用;研究了伪随机编码信号的产生和数学特征,着重分析了伪码调相连续波雷达信号的频谱,及其在雷达测距、测速方面的应用;研究了单脉冲幅度比较体制在雷达测角中的应用;最后,阐述了超近反导系统中复合体制雷达的工作过程。
A high-resolution method for frequency measurement is strongly introduced in the paper, which is aim at detecting the frequency of regular and binary phase coding modulated pulse signals with high frequency precision . considering the popularity of linear frequency modulated ( lfm ) signal in electronic systems, this paper then referred a radon-stft arithmetic to calculate the carry frequency of lfm signal . both of these methods referred above are implemented in the signal if detection software 针对常规脉冲调制信号和脉内二相编码调制信号,本文提出一种高精度的数字化测频方法,以提高信号载频测量精度;线性调频信号作为一种典型的非平稳信号在各种领域应用十分广泛,但对其载频的数字化测量比较困难,本文利用图像处理中的radon变换与信号时频分析中的线性变换相结合的算法来完成对其载频的测量。