• Title/Summary/Keyword: BOC

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A Novel BOC(n,n) Correlation Function for Maritime Satellite Communications (해양 위성 통신을 위한 BOC(n,n) 신호의 새로운 상관함수)

  • Lee, Youngseok;Lee, Seong Ro;Yoon, Seokho
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.38C no.3
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    • pp.296-302
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    • 2013
  • The binary offset carrier (BOC) modulation has attracted much attention as a new physical layer implementation for satellite communication and global navigation satellite systems. In this paper, we propose a new correlation function for sine-phased BOC signals. Specifically, we separate a sub-carrier pulse into several rectangular pulses, and then, generate a number of partial correlation functions. Finally we combine the partial correlation functions to yield an unambiguous correlation function with no side-peak. From numerical results, it is demonstrated that the proposed correlation function provides a significant tracking performance improvement over the conventional correlation functions.

Practical and Green Approach for N-Boc Protection of Amines Catalyzed by Indion 190 Resin (Indion 190 수지에 의한 아민촉매의 N-Boc protection의 실용적이며 친환경적 접근법)

  • Chaskar, Atul;Yewale, Sampat;Langi, Bhushan;Deokar, Hrushikesh
    • Journal of the Korean Chemical Society
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    • v.53 no.4
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    • pp.422-426
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    • 2009
  • An efficient, chemoselective and practical protocol for N-Boc protection of amines using di-tertbutoxypyrocarbonate $(Boc)_{2}O$ in presence of Indion 190 resin. Resin was easily separated from the reaction mixture by filtration and reused in subsequent reactions without any apparent loss of activity. Simple workup, mild condition, short reaction time and high yield are some of the striking features of the present process.

A Generalized Advanced Region Correlation (G-ARC) Scheme for BOC(pn,n) Modulated Code Tracking in GNSS (BOC(pn,n) 변조된 확산신호의 부호동기추적을 위한 일반화된 이른영역상관기법)

  • Yoo, Seung-Soo;Lee, Young-Yoon;Kim, Yeong-Moon;Yoon, Seok-Ho;Kim, Sun-Yong
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.34 no.3C
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    • pp.329-340
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    • 2009
  • This paper proposes a novel code tracking scheme to track the fine code synchronization for BOC(pn,n) modulated spreading signals. The correlation function of BOC(pn,n) modulated spreading signals has been several peaks. In this paper, we observe that the correlation function in the advanced offset region remains almost unchanged, due to the multipath signals being received later than a line-of-sight signal. Based on this observation, we propose a novel code tracking scheme which is called the advanced region correlation (ARC) method for BOC(n,n) modulated spreading signals. And, we compare with the code tracking accuracy between the conventional and proposed methods in the static multipath and land mobile satellite system channels through the Monte-Carlo simulation. Then, base on the proposed scheme, we propose the generalized-ARC (ARC) scheme for BOC(pn, n) modulated spreading signals.

Generating Method of an Unambiguous Correlation Function for AltBOC Signal Tracking (AltBOC의 코드 추적을 위한 비모호 상관함수 생성 기법)

  • Woo, Sunghyuk;Chae, Keunhong;Lee, Seong Ro;Park, Soonyoung;Yoon, Seokho
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.40 no.5
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    • pp.957-963
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    • 2015
  • The autocorrelation of an alternative binary offset carrier (AltBOC) signal provides an improved positioning accuracy because of its narrow main-peak. However, The AltBOC signal has a disadvantage that the autocorrelation of the AltBOC signal has multiple side-peaks which incur a severe positioning error. In this paper, we propose a generating method of an unambiguous correlation function for AltBOC signal tracking. Specifically, we first obtain symmetric partial correlation functions, and subsequently, we obtain an unambiguous correlation function by combining them. In numerical results, it is confirmed that the proposed correlation function provides better tracking error standard devation (TESD) performances comparing with the conventional correlation functions.

Galileo BOC(1,1) Signal Tracking using GPS/Galileo Software Receiver

  • Lim, Deok-Won;Park, Chan-Sik;Lee, Sang-Jeong
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • v.2
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    • pp.285-289
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    • 2006
  • In this paper, a design and implementation of GPS/Galileo software receiver is given. As a GPS receiver, it is able to perform every function of receiver such as acquisition, code and carrier tracking, navigation bit extraction, navigation data decoding, pseudorange calculations, and position calculations. A method to acquire and track the Galileo BOC(1,1) signal is also required because the correlation of BOC(1,1) signal has multiple peaks different from that of GPS signal. Therefore, a method to detect the main-peak in correlation function of BOC signal is required to avoid false acquisition. In this paper, very-early, very late correlation is implemented to track the correct main peak. The performance of implemented GPS/Galileo software receiver with BOC(1,1) signal tracking feature is evaluated with GPS/Galileo IF signal generator.

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Development of Galileo E5 Signal Receiving Software for AltBoc Signal Modulation (AltBOC 변조 특성을 활용한 Galileo E5 신호 수신 소프트웨어 개발)

  • Jeon, Sang-Hoon;So, Hyoung-Min;Lee, Taik-Jin;Kim, Ghang-Ho;Jeon, Seung-Il;Kim, Chong-Won;Kee, Chang-Don;Lee, Sang-Uk;Kim, Jae-Hoon
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.37 no.9
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    • pp.855-862
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    • 2009
  • This paper contains the signal receiving algorithm for Galileo E5 AltBOC signal and the development of Galileo E5 signal receiving software. The software runs the process from signal acquisition to extracting measurement data to get navigation solution. It uses logged IF data file as an input. In signal acquisition stage, 1ms and delayed 1ms data are used for reducing correlation ross from secondary code and navigation bit conversion. Signal tracking stage is made of two stages which are coarse tracking and fine tracking. It is for taking advantage of AltBOC characteristic and resolving ambiguity problem due to BOC modulation. The functions of software are verified by signal processing using logged IF data from commercial GNSS simulator.

A Novel Unambiguous Correlation Function for Cosine-Phased BOC Signal Tracking (코사인 위상 이진 옵셋 반송파 신호 추적에 알맞은 새로운 비모호 상관함수)

  • Kim, Hongdeuk;Lee, Youngseok;Yoon, Seokho
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.38A no.5
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    • pp.409-415
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    • 2013
  • In this paper, we propose a correlation function using newly designed local signals for cosine-phased binary offset carrier (BOC) signal tracking. First, we divide a sub-carrier pulse over one pseudo random noise code period into multiple rectangular pulses, and subsequently, design novel local signals. Then, we obtain a correlation function with no side-peak based on a combination of correlations between the newly generated local signals and received cosine-phased BOC signal. From numerical results, it is confirmed that the proposed correlation function provides a tracking performance improvement over the conventional correlation functions in terms of the tracking error standard deviation.

Comparison of isoButoxycarbonyl derivatives, tert.-butyldimethylsilyl derivatives, with US EPA Method in the sensitivity of Alkylphenols, Chlorophenols, and Bisphenol A Potential field-screening applications of GC/MS-SIM (기체 크로마토그래피/질량분석기를 이용한 field-screening 적용을 위한 알킬페놀류, 클로로페놀류 및 비스페놀 A의 isoBOC 유도체, TBDMS 유도체와 US EPA 방법의 비교)

  • Kim, Hyub;Hong, Jong-Ki;Kim, Yong-Hwa;Kim, Kyoung-Rae
    • Analytical Science and Technology
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    • v.15 no.3
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    • pp.196-213
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    • 2002
  • The alkylphenols, chlorophenols and bisphenol A were determined by gas chromatography/mass spectrometry-selected ion monitoring mode followed by three work-up methods for comparison; EPA method, isoBOC derivatization method and TBDMS derivatization method. Eleven phenols in water samples were extracted with dichloromethane. Also, solid-phase extraction (SPE) with XAD-4 and subsequent conversion to isobutoxycarbonyl derivatives or tert.-butyldimethylsilyl derivatives for sensitive analysis with the selected ion-monitoring (SIM) mode. The recoveries were 85.1~109.9% (EPA method) and 90.3~126.6% (isoBOC derivatization and TBDMS derivatization), respectively. The method detection limit of bisphenol A for SIM were 0.732 ${\mu}g/{\ell}$ (EPA method), 0.002 ${\mu}g/{\ell}$ (isoBOC derivatization) and 0.021 ${\mu}g/{\ell}$ (TBDMS derivatization). The SIM responses were linear with the correlation coefficient varying 0.9755~0.9981 (isoBOC derivatization), and 0.9908~0.9996 (TBDMS derivatization). When these methods were applied to treated wastewater sample from a polyethylene plant, the concentrations of 11 phenols were below the method detection limit.

Enzymatic synthesis of sugar esters of L-lysine and L-aspartic acid

  • Jeon, Gyu-Jong;Park, O-Jin;Sin, Mun-Sik;Yang, Ji-Won
    • 한국생물공학회:학술대회논문집
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    • 2001.11a
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    • pp.646-647
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    • 2001
  • The enzymatic synthesis of conjugates of lysine and aspartic acid with D-glucose was studied. Optimase M-440 showed the very poor regioselectivity in the transesterification of $N{\alpha}$,$N'{\varepsilon}-di-t-Boc-L-Lys-OTFE$ and N-t-Boc-L-Asp-diOTFE with D-glucose. The acylation of glycosidic -OH and primary -OH of D-glucose occurred. However, Optimase M-440 catalyzed only the acylation of primary -OH group in the transesterification of $N{\alpha}$,$N'{\varepsilon}-di-t-Boc-L-Lys-OTFE$ and N-t-Boc-L-Asp-diOTFE with ${\alpha}-$ and ${\beta}-methylglucopyranoside$ in high yields without any other transesterification. Optimase M-440 also discriminated carboxyl groups of N-t-Boc-L-Asp-diOTFE.

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Part-Per-Trillion level determination of Alkylphenols, Chlorophenols and Bisphenol A using GC/MS-SIM in Tap Water

  • Kim, Hyub
    • Proceedings of the Korea Society of Environmental Toocicology Conference
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    • 2003.10a
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    • pp.149-149
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    • 2003
  • A new technique is proposed for the determination of alkylphenols, chlorophenols and bisphenol A in tap water. The sample preparation consists of a solid phase extraction (SPE) of alkylphenols, chlorophenols and bisphenol A from a water sample with XAD-4 and subsequent conversion to isobutyloxycarbonyl (isoBOC) derivatives or tert.-butyldimethylsilyl (TBDMS) derivatives for sensitive analysis with the GC/MS-SIM mode. The recoveries were 86.6∼105.2 % (isoBOC derivatization) and 97.6∼484.5 % (TBDMS derivatization), respectively. The limit of quantitation of alkylphenols, chlorophenols and bisphenol A for SIM were 0.001∼0.050 $\mu\textrm{g}$/l (isoBOC derivatization) and 0.003∼0.050 $\mu\textrm{g}$/l (TBDMS derivatization). The SIM responses were linear with the correlation coefficient varying 0.9755∼0.9981 (isoBOC derivatization), and 0.9908∼0.9996 (TBDMS derivatization). The derivative methods and their application to tap water samples will be disscussed.

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