For it has many unique advantages , pseudo - noise linear m - sequence binary phased coded cw signal is widely used in the new generation air defense systems 偽隨機(jī)m序列相位編碼連續(xù)波信號(hào)體制由于其固有的優(yōu)點(diǎn),在新一代地空制導(dǎo)雷達(dá)中得到了廣泛的應(yīng)用。
However , the traditional spreading codes are usually deterministic pseudo - noise ( pn ) codes , which can be duplicated , potentially compromising the transmission security . then the time varying and random spreading codes are expected 為了提高擴(kuò)頻通信系統(tǒng)的抗干擾性、降低信號(hào)被截獲的概率,我們希望擴(kuò)頻碼是隨機(jī)的、動(dòng)態(tài)變化的。
Based on the statistics characteristic of prc - phase - modulation cw phase - array guidance radar , this thesis discusses the signal processing method and cfar algorithm of multiple repetition frequency pseudo - noise m - sequence phase coded signal 本文結(jié)合偽碼調(diào)相連續(xù)波信號(hào)體制的特點(diǎn),深入研究了多參差重復(fù)頻率偽隨機(jī)m序列相位編碼信號(hào)的處理方法和恒虛警檢測(cè)算法。
Traditional spread spectrum communication adopts pseudo - noise ( pn ) codes as spreading codes . however , pn sequence is fixed and periodic , which threatens the transmission security . self - encoded spread spectrum ( sess ) employs random spreading sequences that are extracted from the random information data , abandoning the fixed sequence 傳統(tǒng)的擴(kuò)頻通信廣泛采用偽噪聲( pseudo - noise , pn )序列作為擴(kuò)頻序列, pn序列具有類噪聲特性,但它實(shí)際上是確定的周期序列,容易被復(fù)制。
Simulations on the key technique of spread spectrum communications are studied here , according to the characteristic of lduwarc system , issues concerning pseudo - noise codes , spread spectrum method , correlation receiving and synchronization . we also design an error correction code for the system 論文還對(duì)擴(kuò)頻通信的關(guān)鍵技術(shù)進(jìn)行了仿真研究,針對(duì)遠(yuǎn)程聲遙控系統(tǒng)的特點(diǎn),討論了擴(kuò)頻碼、擴(kuò)頻方式、相關(guān)接收和同步問(wèn)題,同時(shí)討論了適合遠(yuǎn)程聲遙控系統(tǒng)的糾錯(cuò)編碼技術(shù)。