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随着现代化导航信号带宽的增大,由于可以大幅降低采样率,复信号采样的优势日趋明显。由于存在I/Q幅相误差,复信号采样对导航接收机伪距测量造成了一定影响。改进了信道非理想与I/Q幅相误差共同影响BPSK/QPSK信号零值测量的分析模型;在该模型基础上,推导得到了任意I/Q误差和信道非理想特性影响BOC信号伪距零值的模型;探讨了二者在频域抗干扰应用场景下引起的零值变化;理论分析与软件接收机仿真结果高度吻合,误差在1.5×10-4码片内,证明了分析模型的精确性。该分析方法可用于对高性能导航接收机信道特性进行事先约束及筛选,以确保干扰场景下的零值变化满足要求。 相似文献
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Statistical analysis for masked system life data from Marshall‐Olkin Weibull distribution under progressive hybrid censoring 下载免费PDF全文
This paper considers the statistical analysis of masked data in a series system, where the components are assumed to have Marshall‐Olkin Weibull distribution. Based on type‐I progressive hybrid censored and masked data, we derive the maximum likelihood estimates, approximate confidence intervals, and bootstrap confidence intervals of unknown parameters. As the maximum likelihood estimate does not exist for small sample size, Gibbs sampling is used to obtain the Bayesian estimates and Monte Carlo method is employed to construct the credible intervals based on Jefferys prior with partial information. Numerical simulations are performed to compare the performances of the proposed methods and one data set is analyzed. 相似文献
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ANDILE SOKOMANI 《African Security Review》2013,22(4):81-90
“Lack of money is the root of all evil” George Bernard Shaw In a environment where party financing, private funding in particular, is generally a laissez-faire business, as in most Southern African countries, there is the real risk that interest groups and wealthy individuals will buy influence in political parties and in so doing erode public confidence in the political system. Because they are neither open to public scrutiny nor subject to any legislative restraints, huge private donations can, and often do, come with strings attached. This lack of transparency and openness, as well as mechanisms to prevent it, provides ample ground for influence peddling, where those who pay the piper call the tune. Left unchecked, this party funding scenario will continue to be a serious indictment of the region's democratisation projects, crippling democracy and stunting economic development. This article consid 相似文献
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《Arms and Armour》2013,10(1):33-39
AbstractAn argument is presented that Valentine Green’s mezzotint engraving ‘Queen Elizabeth at the Head of her Army at Tilbury-Fort, A.D. 1588’ (1792) was inspired by the late 18th-century life-sized group of three figures representing the same subject that was formerly on show at the Tower of London. The mezzotint presented in Acta Historica Reginarum Angliae is the only known image of the original pre-1828 setup of the display, showing the figure of the queen in a skirt-like piece of armour that has since been re-identified as King Henry VIII’s tonlet armour. 相似文献
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Jonathan Krause Thomas S. Wilkins Christopher Baxter P.M.H. Bell Vincent Boutet-Lehouillier Malcolm Hugh Patterson 《战略研究杂志》2013,36(1):145-158
Iain McCallum, Blood Brothers Hiram and Hudson Maxim: Pioneers of Modern Warfare. London: Chatham, 1999. Pp. 224, 33 illus., 2 maps, biblio., index. £20. ISBN 1–86176–096–5. Eric Ash, Sir Frederick Sykes and the Air Revolution, 1912–1918. London and Portland, OR: Frank Cass, 1999. Pp.xviii + 268, 20 illus., 3 maps, biblio., index. £42.50/$59.50 (cloth), £18.50/$27.50 (paper). ISBN 0–7146–4828–0 and ‐4382–3. Azar Gat, Fascist and Liberal Visions of War: Fuller, Liddell Hart, Douhet, and other Modernists. Oxford: Clarendon Press, 1998. Ppviii + 334, biblio., index. £45. ISBN 0–19–820715–8. David B. Woolner (ed.), The Second Quebec Conference Revisited: Waging War, Formulating Peace: Canada, Great Britain, and the United States in 1944–1945. Basingstoke; London: Macmillan Press, 1998. Pp.xiii + 210, index. £32.50. ISBN 0–333–75970–2. Jeffrey Grey. Up Top: The Royal Australian Navy and Southeast Asian Conflicts 1955–1972. St Leonards NSW: Allen &; Unwin in association with the Australian War Memorial, 1998. Pp.xx + 380, 110 illus., 12 tables, 23 maps &; diagrams, appendices, notes, biblio., index. NP. ISBN 1–86448–290–7. Susan L Carruthers, The Media at War. Basingstoke: Macmillan, 2000. Pp.321, biblio., index. £14.99 (paper). ISBN 0–333–69143–1, also available in hardback. Edward J. Marolda and Robert J. Schneller Jr, Shield and Sword: The United States Navy and the Persian Gulf War. Washington DC: Naval Historical Center, 1998. Pp.xxi + 517, 120 illus., 14 maps, biblio., index. NP. ISBN 0–1604–9476–1. Marvin Pokrant, Desert Shield at Sea: What the Navy Really Did and Desert Storm at Sea: What the Navy Really Did. Both Westport, CT: Greenwood Press, 1999. Pp.xxiii + 265,9 illus., biblio., index. £44.95. ISBN 0–313–31023–8. Pp.xxiv + 329,12 illus., biblio., index. NP. ISBN 0–313–31024–6. David Kaularich and Ronald C. Kramer, Crimes of the American Nuclear State: At Home and Abroad. Boston: Northeastern University Press, 1999. Pp.xviii + 195, biblio., index. £42.75. ISBN 1–55553–371‐X. Stanley Hoffmann, World Disorders: Troubled Peace in the Post‐Cold War Era. Lanham, MD: Rowman &; Littlefield, 1998. Pp.viii+279, notes, index. $29.95. ISBN 0–8476–8574–8. Lawrence Freedman (ed.), Strategic Coercion: Concepts and Cases. Oxford: Oxford‐University Press, 1998. Pp.400, index. £48. ISBN 0–19–829–349–6. Stephen J. Cimbala, Coercive Military Strategy. College Station, TX: Texas A&;M University Press, 1998. Pp.229, biblio, index; $39.95. ISBN 0–89096–836–5 相似文献