1 Noise enhanced binary hypothesis-testing in a new framework
標(biāo)簽: hypothesis-testing enhanced binary Noise
上傳時(shí)間: 2016-06-02
上傳用戶:siguazgb
普通GPS接收機(jī)在特殊環(huán)境下,如在高樓林立的城市中心,林木遮擋的森林公路,特別是在隧道和室內(nèi)環(huán)境的情況下,由于衛(wèi)星信號(hào)非常微弱,載噪比(Carrier Noise Ratio,C/No)通常都在34dB-Hz以下,很難有效捕獲到衛(wèi)星信號(hào),導(dǎo)致無法正常定位。惡劣條件下的定位有廣闊的發(fā)展和應(yīng)用前景,特別是在交通事故、火災(zāi)和地震等極端環(huán)境下,快速準(zhǔn)確定位當(dāng)事者所處位置對(duì)于降低事態(tài)損失和營救受傷者是極為重要的。歐美和日本等發(fā)達(dá)國家也都制定了相應(yīng)的提高惡劣條件下高靈敏度定位能力的發(fā)展政策。而高靈敏度GPS接收機(jī)定位的關(guān)鍵在于GPS微弱信號(hào)的處理。 本課題的主要研究內(nèi)容是針對(duì)GPS微弱信號(hào)改進(jìn)處理方法。針對(duì)傳統(tǒng)GPS接收機(jī)信號(hào)捕獲中的串行搜索方法提出了基于批處理的微弱信號(hào)捕獲方法,來提高低信噪比情況下微弱信號(hào)的捕獲能力,實(shí)現(xiàn)快速高靈敏度的準(zhǔn)確捕獲;針對(duì)捕獲微弱信號(hào)處理大量數(shù)據(jù)導(dǎo)致的運(yùn)算量激增,運(yùn)用雙塊零拓展(Double Block Zero Padding,DBZP)處理方法減少運(yùn)算量同時(shí)縮短捕獲時(shí)間。針對(duì)傳統(tǒng)GPS接收機(jī)延遲鎖相環(huán)跟蹤算法提出了基于卡爾曼濾波的新型捕獲算法,減小延遲鎖相環(huán)失鎖造成的信號(hào)跟蹤丟失概率,來提高惡劣環(huán)境下低信噪比信號(hào)的跟蹤能力,實(shí)現(xiàn)微弱信號(hào)的連續(xù)可靠跟蹤。通過提高GPS微弱信號(hào)的捕獲與跟蹤能力,進(jìn)而使GPS接收機(jī)在惡劣環(huán)境下衛(wèi)星信號(hào)微弱時(shí)能夠?qū)崿F(xiàn)較好的定位與導(dǎo)航。 通過擬合GPS接收機(jī)實(shí)際接收到的原始數(shù)據(jù),構(gòu)造出不同載噪比的數(shù)字信號(hào),分別對(duì)提出的針對(duì)微弱信號(hào)的捕獲與跟蹤算法進(jìn)行仿真比較驗(yàn)證,結(jié)果表明,對(duì)接收機(jī)后端信號(hào)處理部分作出的算法改進(jìn)使得GPS接收機(jī)可以更好的處理微弱信號(hào),并且具有較高的靈敏度和精度。文章同時(shí)針對(duì)提出的數(shù)據(jù)處理特征使用FPGA技術(shù)對(duì)算法主要的數(shù)據(jù)處理部分進(jìn)行了初步的構(gòu)架實(shí)現(xiàn)并進(jìn)行了板級(jí)驗(yàn)證,結(jié)果表明,利用FPGA技術(shù)可以較好的實(shí)現(xiàn)算法的數(shù)據(jù)處理功能。文章最后給出了結(jié)論,通過提出的基于批處理和基于DBZP方法的捕獲算法以及基于卡爾曼濾波的信號(hào)跟蹤算法,可以有效地解決微弱GPS信號(hào)處理的難題,進(jìn)而實(shí)現(xiàn)微弱信號(hào)環(huán)境下的定位與導(dǎo)航。
標(biāo)簽: FPGA GPS 信號(hào)實(shí)時(shí)處理
上傳時(shí)間: 2013-05-31
上傳用戶:cccole0605
數(shù)字信號(hào)處理與噪音抑制Advanced Digital Signal Processing and Noise Reduction,這個(gè)是第二版。
標(biāo)簽: 數(shù)字信號(hào)處理
上傳時(shí)間: 2013-04-24
上傳用戶:Avoid98
普通GPS接收機(jī)在特殊環(huán)境下,如在高樓林立的城市中心,林木遮擋的森林公路,特別是在隧道和室內(nèi)環(huán)境的情況下,由于衛(wèi)星信號(hào)非常微弱,載噪比(Carrier Noise Ratio,C/No)通常都在34dB-Hz以下,很難有效捕獲到衛(wèi)星信號(hào),導(dǎo)致無法正常定位。惡劣條件下的定位有廣闊的發(fā)展和應(yīng)用前景,特別是在交通事故、火災(zāi)和地震等極端環(huán)境下,快速準(zhǔn)確定位當(dāng)事者所處位置對(duì)于降低事態(tài)損失和營救受傷者是極為重要的。歐美和日本等發(fā)達(dá)國家也都制定了相應(yīng)的提高惡劣條件下高靈敏度定位能力的發(fā)展政策。而高靈敏度GPS接收機(jī)定位的關(guān)鍵在于GPS微弱信號(hào)的處理。 本課題的主要研究內(nèi)容是針對(duì)GPS微弱信號(hào)改進(jìn)處理方法。針對(duì)傳統(tǒng)GPS接收機(jī)信號(hào)捕獲中的串行搜索方法提出了基于批處理的微弱信號(hào)捕獲方法,來提高低信噪比情況下微弱信號(hào)的捕獲能力,實(shí)現(xiàn)快速高靈敏度的準(zhǔn)確捕獲;針對(duì)捕獲微弱信號(hào)處理大量數(shù)據(jù)導(dǎo)致的運(yùn)算量激增,運(yùn)用雙塊零拓展(Double Block Zero Padding,DBZP)處理方法減少運(yùn)算量同時(shí)縮短捕獲時(shí)間。針對(duì)傳統(tǒng)GPS接收機(jī)延遲鎖相環(huán)跟蹤算法提出了基于卡爾曼濾波的新型捕獲算法,減小延遲鎖相環(huán)失鎖造成的信號(hào)跟蹤丟失概率,來提高惡劣環(huán)境下低信噪比信號(hào)的跟蹤能力,實(shí)現(xiàn)微弱信號(hào)的連續(xù)可靠跟蹤。通過提高GPS微弱信號(hào)的捕獲與跟蹤能力,進(jìn)而使GPS接收機(jī)在惡劣環(huán)境下衛(wèi)星信號(hào)微弱時(shí)能夠?qū)崿F(xiàn)較好的定位與導(dǎo)航。 通過擬合GPS接收機(jī)實(shí)際接收到的原始數(shù)據(jù),構(gòu)造出不同載噪比的數(shù)字信號(hào),分別對(duì)提出的針對(duì)微弱信號(hào)的捕獲與跟蹤算法進(jìn)行仿真比較驗(yàn)證,結(jié)果表明,對(duì)接收機(jī)后端信號(hào)處理部分作出的算法改進(jìn)使得GPS接收機(jī)可以更好的處理微弱信號(hào),并且具有較高的靈敏度和精度。文章同時(shí)針對(duì)提出的數(shù)據(jù)處理特征使用FPGA技術(shù)對(duì)算法主要的數(shù)據(jù)處理部分進(jìn)行了初步的構(gòu)架實(shí)現(xiàn)并進(jìn)行了板級(jí)驗(yàn)證,結(jié)果表明,利用FPGA技術(shù)可以較好的實(shí)現(xiàn)算法的數(shù)據(jù)處理功能。文章最后給出了結(jié)論,通過提出的基于批處理和基于DBZP方法的捕獲算法以及基于卡爾曼濾波的信號(hào)跟蹤算法,可以有效地解決微弱GPS信號(hào)處理的難題,進(jìn)而實(shí)現(xiàn)微弱信號(hào)環(huán)境下的定位與導(dǎo)航。
標(biāo)簽: FPGA GPS 信號(hào)實(shí)時(shí)處理
上傳時(shí)間: 2013-04-24
上傳用戶:變形金剛
微弱信號(hào)檢測(cè)裝置 四川理工學(xué)院 劉鵬飛、梁天德、曾學(xué)明 摘要: 本設(shè)計(jì)以TI的Launch Pad為核心板,采用鎖相放大技術(shù)設(shè)計(jì)并制作了一套微弱信號(hào)檢測(cè)裝置,用以檢測(cè)在強(qiáng)噪聲背景下已知頻率微弱正弦波信號(hào)的幅度值,并在液晶屏上數(shù)字顯示出所測(cè)信號(hào)相應(yīng)的幅度值。實(shí)驗(yàn)結(jié)果顯示其抗干擾能力強(qiáng),測(cè)量精度高。 關(guān)鍵詞:強(qiáng)噪聲;微弱信號(hào);鎖相放大;Launch Pad Abstract: This design is based on the Launch Pad of TI core board, using a lock-in amplifier technique designed and produced a weak signal detection device, to measure the known frequency sine wave signal amplitude values of the weak in the high Noise background, and shows the measured signal amplitude of the corresponding value in the liquid crystal screen. Test results showed that it has high accuracy and strong anti-jamming capability. Keywords: weak signal detection; lock-in-amplifier; Launch Pad 1、引言 隨著現(xiàn)代科學(xué)技術(shù)的發(fā)展,在科研與生產(chǎn)過程中人們?cè)絹碓叫枰獜膹?fù)雜高強(qiáng)度的噪聲中檢測(cè)出有用的微弱信號(hào),因此對(duì)微弱信號(hào)的檢測(cè)成為當(dāng)前科研的熱點(diǎn)。微弱信號(hào)并不意味著信號(hào)幅度小,而是指被噪聲淹沒的信號(hào),“微弱”也僅是相對(duì)于噪聲而言的。只有在有效抑制噪聲的條件下有選擇的放大微弱信號(hào)的幅度,才能提取出有用信號(hào)。微弱信號(hào)檢測(cè)技術(shù)的應(yīng)用相當(dāng)廣泛,在生物醫(yī)學(xué)、光學(xué)、電學(xué)、材料科學(xué)等相關(guān)領(lǐng)域顯得愈發(fā)重要。 2、方案論證 針對(duì)微弱信號(hào)的檢測(cè)的方法有很多,比如濾波法、取樣積分器、鎖相放大器等。下面就針對(duì)這幾種方法做一簡要說明。 方案一:濾波法。 在大部分的檢測(cè)儀器中都要用到濾波方法對(duì)模擬信號(hào)進(jìn)行一定的處理,例如隔離直流分量,改善信號(hào)波形,防止離散化時(shí)的波形混疊,克服噪聲的不利影響,提高信噪比等。常用的噪聲濾波器有:帶通、帶阻、高通、低通等。但是濾波方法檢測(cè)信號(hào)不能用于信號(hào)頻譜與噪聲頻譜重疊的情況,有其局限性。雖然可以對(duì)濾波器的通頻帶進(jìn)行調(diào)節(jié),但其噪聲抑制能力有限,同時(shí)其準(zhǔn)確性與穩(wěn)定性將大打折扣。
標(biāo)簽: 2012 TI 電子設(shè)計(jì)大賽 微弱信號(hào)
上傳時(shí)間: 2013-11-04
上傳用戶:lty6899826
Abstract: This application note describes a new generation of digital-input Class D audio amplifiers that achieve high PSRRperformance, comparable to traditional analog Class D amplifiers. More importantly, these digital-input Class D amplifiersprovide additional benefits of reduced power, complexity, Noise, and system cost.
標(biāo)簽: 數(shù)字輸入放大器 系統(tǒng)設(shè)計(jì)
上傳時(shí)間: 2013-12-20
上傳用戶:JIUSHICHEN
Abstract: Most magnetic read head data sheets do not fully specify the frequency-dependent components andare often vague when specifying other key parameters. In some cases, the specifications of two very similarheads from two different manufacturers might be quite different in terms of parameters specified and omitted.The limitations in the data sheets make designing an optimum card reading system unnecessarily difficult andtime consuming. This document outlines a strategy to overcome the above shortcomings and offers guidelinesto overcome the Noise issues.
標(biāo)簽: MCR 噪聲環(huán)境 磁卡讀寫器
上傳時(shí)間: 2013-11-13
上傳用戶:dysyase
The MAX17600–MAX17605 devices are high-speedMOSFET drivers capable of sinking /sourcing 4A peakcurrents. The devices have various inverting and noninvertingpart options that provide greater flexibility incontrolling the MOSFET. The devices have internal logiccircuitry that prevents shoot-through during output-statchanges. The logic inputs are protected against voltagespikes up to +14V, regardless of VDD voltage. Propagationdelay time is minimized and matched between the dualchannels. The devices have very fast switching time,combined with short propagation delays (12ns typ),making them ideal for high-frequency circuits. Thedevices operate from a +4V to +14V single powersupply and typically consume 1mA of supply current.The MAX17600/MAX17601 have standard TTLinput logic levels, while the MAX17603 /MAX17604/MAX17605 have CMOS-like high-Noise margin (HNM)input logic levels. The MAX17600/MAX17603 are dualinverting input drivers, the MAX17601/MAX17604 aredual noninverting input drivers, and the MAX17602 /MAX17605 devices have one noninverting and oneinverting input. These devices are provided with enablepins (ENA, ENB) for better control of driver operation.
標(biāo)簽: 17600 MAX 數(shù)據(jù)資料
上傳時(shí)間: 2013-12-20
上傳用戶:zhangxin
Abstract: If sensitive analog systems are run from one supply without the sufficient bypassing to eliminate Noise,
上傳時(shí)間: 2013-11-23
上傳用戶:qiulin1010
Abstract: Specifications such as Noise, effective number of bits (ENOB), effective resolution, and Noise-free resolution inlarge part define how accurate an ADC really is. Consequently, understanding the performance metrics related to Noise isone of the most difficult aspects of transitioning from a SAR to a delta-sigma ADC. With the current demand for higherresolution, designers must develop a better understanding of ADC Noise, ENOB, effective resolution, and signal-to-Noiseratio (SNR). This application note helps that understanding.
標(biāo)簽: ENOB 模數(shù)轉(zhuǎn)換器
上傳時(shí)間: 2013-10-16
上傳用戶:x18010875091
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