code acquisition 中文意思是什麼

code acquisition 解釋
碼的捕獲
  • code : n 1 法典；法規。2 規則，準則；（社會、階級等的）慣例，習俗，制度。3 （電）碼，代碼，密碼，暗碼；...
  • acquisition : n. 1. 取得，獲得；習得。2. 取得物，獲得物[人]。3. 【無線電】探測。
  1. Fast acquisition in pn code receiver with dsp fpga technology

    的擴頻接收機快捕技術
  2. 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。
  3. This paper investigates the key technology of the ds - cdma system - psendonoise ( pn ) code acquisition technology. various pn code acquisition scheme has been introduced here

    本文對ds - cdma系統中的關鍵技術?擴頻序列的捕獲?進行了深入的研究，介紹了擴頻序列的多種捕獲方案。
  4. However, the longer length of c / a code, the more hardware resource and power it cost. this dissertation commits research on algorithm of c / a code acquisition in satellite navigation position system, and compares the acquisition means of digital differential matched filter ( ddmf ) with traditional means, and also achieves ddmf with the vhdl language and fpga platform

    擴頻碼的周期的加長會給衛星導航定位系統帶來許多相應的好處，但問題也就隨著之而來了，擴頻碼的周期越長，同步捕獲所需得的時間就越長，而且若用傳統的并行捕獲方法，將極大的耗費硬體資源，而且系統功耗會隨之增大。
  5. At last the algorithm of ddmf is achieved by the investigation tool of altera company ? quartus ii and the vhdl language, and its ip core is also achieved which is used not only in the satellite navigation position system, but also in the long pn code dsss system. ddmf investigated in the dissertation gives a good way to design the rapid pn code acquisition in the beidou project, and the technology has the definite theory and practice significance

    此外還應用altera公司的最新的fpga開發工具quartusiiv5 . 1 ，採用了國際標準的硬體描述語言? vhdl語言，對數字差動匹配濾波器和傳統匹配濾波器演算法予以實現，開發了該演算法的軟ip核，可以對所應用的擴頻碼長度， a / d采樣后的數據量化階數，所用擴頻碼等可進行隨意改寫。
  6. Because the hybrid acquisition scheme ( combines parallel search with serial search ) based on the correlator provides the flexibility in the trade - off between the mean acquisition time and system complexity and is easy to implement, it ? focus on the scheme here. on the other hand, this paper analyzes the effect of multiple access inference ( mai ) on the code acquisition performance for the multipath fading channels

    基於相關器解擴的串-並混合方案由於有著可在平均捕獲時間和電路復雜程度（這是捕獲電路的兩個重要指標）這兩個技術指標間靈活折衷的優點和易於實現的特點，本文的重點就放在該方案中。
  7. The signal format of gps is analyzed, the principle models and mathematical models are established, the ber performance is analyzed in a channel interfered with wide - bandwidth awgn, narrow - bandwidth awgn, transmitted signal, single - tone signal respectively. based on the results above interference methods are discussed and simulated. then the performance of code acquisition and code trace of a digital gps receiver are discussed. the modem of linkl 1 and link4a are modeled and their ber performances are analyzed and simulated in channel s interfered with awgn, single - tone signal and multi - tone signal respectively

    建立了jtids的收發終端的數學模型，分析它在噪聲干擾、相關干擾、互相關干擾下的誤碼性能，提出較佳的干擾方法和干擾碼型，並進行模擬模擬；分析了gps的信號格式，建立了gps的原理框圖模型、信號數學模型，並對其在寬帶噪聲干擾、窄帶噪聲干擾、轉發干擾、單頻干擾等情形下的誤碼性能進行了分析比較，提出相對較佳的干擾方法，並做了計算機模擬，針對一數字式gps接收機中擴頻碼捕獲與跟蹤環的特性進行分析；建立了link11和link4a數據鏈調制解調數學模型，對它們在噪聲干擾、單音干擾、多音干擾等下的誤碼性能進行分析，最後對干擾情況進行了模擬模擬。
  8. This paper introduces a project based on code division multiplexed that is used to realize four el channels ' s wireless transportation. after briefly introducing the whole structure of the device of transportation, this paper introduces mainly implemention of the hardware. futhermore, the discussion concerning the selection of principles in code acquisition and the threshold setting of code acquisition on continous pilot in the receiving unit is given. at the same time, the methods about how to design the parameters of dll is introduced in this paper. in addtion, how to solve the actual problems in debugging the hardware is also provided

    本文提出了一種基於碼分復用技術的四路e1數據擴頻無線傳輸設備的實現方案。在介紹整個擴頻數傳設備實現框圖的基礎上，重點介紹了硬體平臺的實現；接收單元捕獲策略的研究及其捕獲門限的確定方法；以及接收單元dll環路參數設計方法；並給出了調試過程中遇到的實際問題及其解決措施。基於調試所遇到的問題，論文的最後提出了這套數傳設備的改進方案。
  9. After establishing the model of intermediate frequency direct sequence spreading spectrum ( if dsss ) receiver, comparing and analyzing several conventional code acquisition methods, code and carrier two - dimension fast acquisition scheme based on two - dimension fft is proposed. finally, the situation for two targets is analyzed

    首先在建立了中頻直擴接收機的模型之後，本文對常用的偽碼捕獲方法進行了詳細地分析和比較，然後提出了本文的基於二維傅立葉變換技術的快速捕獲方法，並且分析了兩個目標時的情況。
  10. The results arc discussed and analyzed in four aspects ; chunking and vocabulary acquisition, comprehensible input and vocabulary acquisition, meaningful learning and vocabulary acquisition, perception, code, retrieval and vocabulary acquisition

    本文從四個方面詳細討論並分析了本實驗的結果，包括組塊與詞匯習得，可理解的輸入與詞匯習得，有意義的學習與詞匯習得，感知、編碼、提取與詞匯習得。
  11. By complementing the proposed scheme with methods to estimate the fractional code delay, the acquisition unit an provide high quality delay estimates such that it can instead of the delay locked loop in the traditional ds receiver. after dispreading successfully, this dissertation introduces a method to estimate the doppler - shift directly from some samples based maximum likelihood estimation, and then revise it forwardly

    在成功解擴之後，本文利用最大似然估計從l個樣點中直接估計出殘余多普勒頻偏，並進行前向頻偏校正，來代替傳統擴頻接收機中的科斯塔斯環，經模擬證明該方法的估計精度完全滿足解調的要求。
  12. The performance targets of acquisition and tracking : the code rate of pseudorandom signals is 1m - 5mhz, the code length is 255. 511, the receiving sensitivity is - 118dbm, the dynamic range is 70db. the doppler of carrier is 75khz, the time that 10 targets are captured within 0. 2s

    捕獲和跟蹤的性能指標：偽隨機信號碼率1m 5m比特/秒，碼長是255 、 511 ，接收靈敏度是- 118db ，信號動態范圍是70db載波普勒是75khz ，目標捕獲在0 . 2秒內。
  13. A pn code phase acquisition with non - coherent sequential detection

    基於非相干序貫檢測器實現的偽碼捕獲器
  14. This article works over a mathod named large step fast acquisition to capture the pn code in the receiver, which was originally put forward for the acquisition and synchronization of long pn code under the condition of low signal to noise ratio ( s / n )

    本文主要研究了大步進快速捕獲法，該方法是針對低信噪比下長擴頻碼的捕獲和同步問題提出的。
  15. In this thesis, first, we present the theory of sess system, the generation of the sess spreading code and its characteristics and the acquisition theory of conventional spread spectrum communication system. an efficient acquisition scheme based on periodically transmitting the synchronization head, which is composed of binary chaotic codes, using the matched filter and automatic decision threshold - level control based on a so - called constant false alarm criterion for sess system is present. the acquisition model of sess system is built and simulated in the awgn channel, the raleigh fading channel and imulti - address interfere condition

    本文首先概述了自編碼擴頻通信的原理、自編碼擴頻序列的產生方法及其特性和擴頻通信系統編碼同步的理論，然後針對自編碼擴頻通信系統提出了擴頻序列捕獲方案:周期性地加入混沌序列同步碼，並採用恆虛警率匹配濾波器捕獲法;在加性白高斯噪聲通道、瑞利衰落通道和多址干擾情況下進行了模擬，分析了各種捕獲性能:在選擇性能最優的混沌序列、適當的序列長度、虛警概率及門限值的情況下，可以獲得較短的捕獲時間和較大的捕獲概率。
  16. Pn code synchronization algorithm based on serial - search acquisition scheme and delay - looked loop tracking is discussed in detail

    闡述了基於滑動相關捕獲及延遲跟蹤環跟蹤的偽碼同步技術的設計與實現。
  17. Frame synchronization, acquisition and tracking of cc - codes are simulated. continual special code insertion method is used in the simulation of frame synchronization

    分別對幀同步、完全互補碼的捕獲、擴頻碼序列的跟蹤進行了模擬研究。
  18. C a code - coarse acquisition code

    粗捕獲碼
  19. Coarse acquisition code c a

    粗捕獲碼
  20. Coarse acquisition code

    粗捕獲碼
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