隨機碼 的英文怎麼說
中文拼音 [suíjīmǎ]
隨機碼
英文
hatted code-
As a result, pseudorandom code acquisition and tracking, carrier recovering, error correction and decoding functions are needed in the if digital receiver
因此，其中頻數字接收機需要完成偽隨機碼捕獲跟蹤、載波恢復、糾錯譯碼等功能。In chapter 5 the jamming such as phase modulation noise, binary pseudo random sequence and multiple pseudo targets are discussed
第五章對雷達干擾進行了闡述，主要的干擾信號有連續噪聲調相干擾、偽隨機碼噪聲干擾、多假目標干擾。And a few module of quasi random code modulation signal and a radar signal processing module which can extract the information of velocity and range are carried on. the result can be applied on radar systems
接下來實現了幾種偽隨機碼調制信號的模塊以及提取速度距離信息的雷達信號處理模塊，成果可用於實際的雷達系統。This paper discusses a algorithm of file encryption based on random factor
本文提出一種基於隨機碼數列的文件加密演算法。The project fulfills two of very important funcitons in a fh communication system - the generation of pn code and the synthesizing of hopping frequencies, and unites them together efficiently
該方案完成了跳頻通信系統中極為重要的兩個功能：偽隨機碼的產生和跳變頻率的合成，並將它們有機地結合在一起。This dissertation adopts a universal digital ds / dmpsk modulation and demodulation scheme which is based on fpga. this scheme adopts quadrature balanceable modulation, intermediate frequency sampling, digital matched filtering, delay differential demodulation techniques and so on. it directly processes the digital signals on intermediate frequency without down - conversion, and doesn ’ t need pseudo random codes synchronization and carrier wave extraction circuits
本文採用了一種基於fpga的通用數字調制解調方案，該方案在調制端採用了正交平衡調制技術，在解調端採用了中頻帶通采樣、數字匹配濾波、延時差分解調等技術，直接在中頻上進行數字信號處理，不需要進行下變頻，也不需要增加額外的偽隨機碼同步捕獲和載波提取電路。The catching time of pn code for ds - cdma
偽隨機碼的捕捉時間The selection of the pn sequence is very important because it influences the quality of the channel measurement directly. so it is discussed in this paper. because this system is a set of software radio, that is to say that the system is based on the pc platform and all other function is implemented by programming, so the selection of correlation fast algorithm, which is used in receiver frequently, is also very important
本文對直序擴頻技術進行了系統地研究，對其中偽隨機碼的選擇直接影響到通道測量的質量的問題進行了討論，因為本系統是一套軟體無線電，即以pc機為平臺，其他的功能都由軟體編程完成，所以對信號接收中大量使用的相關的快速演算法的選擇也至關重要。The software synchronization method, which can be used to recovery the eye diagram of asynchronous sampling data, was analyzed
分析了利用異步取樣數據實現軟體同步恢復從而獲得隨機碼信號眼圖的演算法，為今後的應用研究打下基礎。Then we introduce pulse position modulation ( ppm ) using pn code and analysis its multi - access performance, system capacity and power spectrum density. on the basis of those analyses, we study the pulse shape and the anti - jamming ability of the system. at last, multiple access with pseudochaotic time hopping is introduce
本文首先闡述了uwb脈沖通信系統的基本原理，重點介紹了用偽隨機碼跳時的ppm （脈沖位置調制）調制，分析了他的多址性能、系統容量和功率譜密度，在此基礎上研究了改進性能的發射信號形狀和系統抗干擾能力，最後介紹了偽混沌碼跳時的多址方式。2, studying the character of the output of the laser used on the practical qkd system, and design and made a photo - electronic detection circuit to accomplish the necessary photo ? electronic conversion for the practical qkd system. 3, designed two balance true random codes generators for qkd system, they are based on physical random source. and analyzed randomicity of the generators
三、設計製作了量子保密通信用的真隨機碼發生器，先後製成了兩臺樣機，一臺採用窄帶隨機信號源，一臺採用寬帶隨機源，並研究了隨機源對隨機碼的隨機性的影響，最後進行了隨機性的分析。Pseudon - random code of direct - sequence spread - spectrum commnunication system
直接系列擴頻通信中的偽隨機碼The pseudorandom codes have a good autocorrelation of double - values. in recent years, to solve the problems of anti - interference and the ambiguity of range and velocity, a lot of countries do much research to change the waveform of radar signal. the most important improve is to use symmetrical pulses to interrupt frequency modulated continuous wave ( fmpcw )
早期的fmicw採用偽碼序列截斷，偽隨機碼具有良好的雙值自相關特性，其中最常用的是m序列截斷的fmicw 。近年來，為了解決抗干擾和測距、測速模糊問題，許多國家已對雷達信號波形的改進進行了研究。Besides, the impacts of several different kinds of transmitted pulses on ber performance are investigated with numerical examples. further, we discuss the design of optimal pulse in the context of this thesis
此外，本文還比較了幾種常見脈沖，常見偽隨機碼對系統誤碼率的影響，並對最優脈沖的設計進行了初步探討。In the end, implementation of if digital receiver unit of tdrss user transponder by the method of fpga and dsp cooperation design are completed successfully, which leads to good ds - ss if receiver design for the signal whose carrier frequency is 3mhz, pseudorandom code rate is 3mchips / s, data rate is 10kbps, frequency offset is no more 1khz, and modulation mode is bpsk
最後，完成了該中頻數字接收機設計，並對其進行調試和測試。測試結果表明，該接收機能對載頻為3mhz ，頻偏不大於1khz ，偽隨機碼速率為3mchips / s ，信息碼速率為10kbps ， bpsk調制的直接序列擴頻中頻信號進行接收，基本滿足設計要求。Choice and implement of pn sequence in spread spectrum communication system in asic chip ' s development
擴頻通信晶元開發中偽隨機碼的選擇及實現This chapter is a base of next chapter. mathematics theory and pseudo stochastic code theory for spread spectrum modulation sequence are introduced, and simulink experiment and analysis about correlation performance of the most common use spectrum modulation sequence are processed, these experiment contact to performance parameters of the spread spectrum sequence. the correlation performance and address quantity are compared between m sequence and gold sequence
本章是第五章的理論基礎，介紹了擴頻調制序列的數理基礎和偽隨機碼理論，同時聯系調制序列的性能指標對最常用的兩種擴頻調制序列的相關性能進行了模擬研究和分析討論，比較了m序列和gold序列互相關特性和地址數。It is an unperiod and an irregular course. it is not convergence but dose have a bound, while it is sensitive to its initial value. for all these special performance, chaos has a excellent outlook in the application of telecommunication, especially in the generation of pn sequence
混沌現象是在非線性動態系統中出現的確定性的，類似隨機的過程，這種過程非周期，是一種貌似無規則的運動，不收斂但有界，且對初值具有及其敏感的依賴性，這些獨具特色的性質使得混沌在通信應用領域尤其在偽隨機碼的產生方面有著很好的應用前景。Algorithm and design for pseudo - random sequence ultrasonic spread spectrum distance measurement system
偽隨機碼超聲擴頻測距系統設計與演算法The algorithm encrypt a file by random factor by bit add xor add circular cryptographic key
該演算法採用按位隨機碼數列+異或+循環密鑰的方式進行加密。分享友人