code acquisition造句
例句與造句
- 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(shù)字接收機(jī)需要完成偽隨機(jī)碼捕獲跟蹤、載波恢復(fù)、糾錯(cuò)譯碼等功能。 - 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(duì)ds - cdma系統(tǒng)中的關(guān)鍵技術(shù)?擴(kuò)頻序列的捕獲?進(jìn)行了深入的研究，介紹了擴(kuò)頻序列的多種捕獲方案。 - 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(kuò)頻碼的周期的加長(zhǎng)會(huì)給衛(wèi)星導(dǎo)航定位系統(tǒng)帶來許多相應(yīng)的好處,但問題也就隨著之而來了,擴(kuò)頻碼的周期越長(zhǎng),同步捕獲所需得的時(shí)間就越長(zhǎng),而且若用傳統(tǒng)的并行捕獲方法,將極大的耗費(fèi)硬件資源,而且系統(tǒng)功耗會(huì)隨之增大。 - 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(yīng)用altera公司的最新的fpga開發(fā)工具quartusiiv5 . 1 ,采用了國(guó)際標(biāo)準(zhǔn)的硬件描述語言? vhdl語言,對(duì)數(shù)字差動(dòng)匹配濾波器和傳統(tǒng)匹配濾波器算法予以實(shí)現(xiàn),開發(fā)了該算法的軟ip核,可以對(duì)所應(yīng)用的擴(kuò)頻碼長(zhǎng)度, a / d采樣后的數(shù)據(jù)量化階數(shù),所用擴(kuò)頻碼等可進(jìn)行隨意改寫。 - 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
基于相關(guān)器解擴(kuò)的串-并混合方案由于有著可在平均捕獲時(shí)間和電路復(fù)雜程度（這是捕獲電路的兩個(gè)重要指標(biāo)）這兩個(gè)技術(shù)指標(biāo)間靈活折衷的優(yōu)點(diǎn)和易于實(shí)現(xiàn)的特點(diǎn)，本文的重點(diǎn)就放在該方案中。 - It's difficult to find code acquisition in a sentence. 用code acquisition造句挺難的
- 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(fā)終端的數(shù)學(xué)模型，分析它在噪聲干擾、相關(guān)干擾、互相關(guān)干擾下的誤碼性能，提出較佳的干擾方法和干擾碼型，并進(jìn)行仿真模擬；分析了gps的信號(hào)格式，建立了gps的原理框圖模型、信號(hào)數(shù)學(xué)模型，并對(duì)其在寬帶噪聲干擾、窄帶噪聲干擾、轉(zhuǎn)發(fā)干擾、單頻干擾等情形下的誤碼性能進(jìn)行了分析比較，提出相對(duì)較佳的干擾方法，并做了計(jì)算機(jī)模擬，針對(duì)一數(shù)字式gps接收機(jī)中擴(kuò)頻碼捕獲與跟蹤環(huán)的特性進(jìn)行分析；建立了link11和link4a數(shù)據(jù)鏈調(diào)制解調(diào)數(shù)學(xué)模型，對(duì)它們?cè)谠肼暩蓴_、單音干擾、多音干擾等下的誤碼性能進(jìn)行分析，最后對(duì)干擾情況進(jìn)行了仿真模擬。 - 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(kuò)接收機(jī)的模型之后,本文對(duì)常用的偽碼捕獲方法進(jìn)行了詳細(xì)地分析和比較,然后提出了本文的基于二維傅立葉變換技術(shù)的快速捕獲方法,并且分析了兩個(gè)目標(biāo)時(shí)的情況。