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通过对双目视觉测量系统的研究,建立了双目视觉测量系统的误差模型,并分析了系统结构参数对测量结果的影响。在理论上对系统结构参数(两光轴夹角、基线距离)与测量精度之间的关系进行了系统、详尽的分析,得出了测量系统的位置误差对距离方向上的精度影响较大;光轴夹角的变化对测量误差影响不大,而距离方向的误差随着基线距离的增加而减小的结论。本文建立的误差模型对具体的双目视觉测量系统的设计具有指导作用。 相似文献
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GNSS测姿系统的天线设置是影响测姿精度的重要因素之一;针对GNSS天线设置对测姿精度的影响问题,在分析GNSS测姿算法的基础上,对天线设置的3个决定因素,即天线数量、基线夹角和基线长度与姿态角误差的关系进行了理论推导,仿真分析了三者对测姿误差的影响程度;理论推导结果表明,对航向角、俯仰角和横滚角的测量至少需要三个固定天线,天线构成的固定基线相互垂直时姿态角的误差较小,姿态角的误差与基线长度的平方成反比;仿真结果验证了上述结论并进一步表明,两基线长度分别为1 m、2 m、3 m时,航向角和俯仰角的误差分别在2°、1°、0.5°以内,横滚角的误差分别在3°、2°、1°以内。 相似文献
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冗余机械臂的避障问题一直是工业机器人应用领域的研究热点之一;为了改进传统避障算法的不足,提出了一种多运动障碍物的避障算法;该算法利用各障碍物的运动状态得到与机械臂之间的最小预测距离,并将其利用雅可比转置矩阵转化为机械臂对应杆件上的躲避速度,再将躲避速度引入梯度投影法中求得机械臂的关节角速度,并通过积分得到避障运动中机械臂的关节角度值,在完成末端轨迹跟踪的同时实现冗余机械臂的实时避障;利用一款七自由度冗余机械臂对该算法进行了仿真验证,结果表明该算法能有效实现冗余机械臂对多运动障碍物的避障。 相似文献
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基于氧气A吸收带的baseline拟合距离反演算法 总被引:1,自引:0,他引:1
目标红外被动测距的实现同气体及其波段的选取密切相关。氧气A吸收带具有独特的谱线结构,对于火箭羽流或者高温辐射体的距离探测,氧气A吸收带是最佳的距离反演通道。利用该特点,详细研究了逐线积分算法(LBLRTM),并设计了氧气A带吸收系数及标准光谱计算软件;利用A吸收带吸收光谱带外数据,采用多项式拟合方法,实现基线(baseline)拟合,进而得到带平均透过率;在不同的距离条件下,将两种带平均透过率进行对比,误差在1.9%左右,拟合精度较高,该方法为后续距离的精确反演提供了理论依据。 相似文献
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通过实验和理论方法系统地研究了以低聚(芴-亚乙烯基)为官能团的蒽基线型低聚物(An-OFVn (n=1~4)) 的光物理性质. 稳态光谱测量表明:芴-亚乙烯基单元的增加会导致吸收光谱的红移,并抑制低聚物间激基缔合物的形成. 量化计算表明:随着芴-亚乙烯基单元的增加,HOMO,LUMO能级及带隙逐渐趋于常量. 支臂上的电子云分布也逐渐增强,使得低聚物吸收光谱的形状逐步趋向于支臂本身吸收光谱的形状. 时间分辨荧光测试表明,当低聚物中芴-亚乙烯基单元的数目≥2后,激基缔合物的辐射寿命几乎是不变的. 在非线性光学测试中,双光子荧光产率和双光子吸收截面都会随着芴-亚乙烯基单元的增加逐渐增强,并于芴-亚乙烯基单元的数目为4时接近一个极值. 相似文献
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讨论了银道面内的引力场强分布和太阳在银河系中所受引力与到银心距离r的关系,指出引力场强g并不是与r的平方成反比,这是由于银河系的大小和形状不能忽略造成的.强调了万有引力定律的适用条件. 相似文献
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R. A. Vadov 《Acoustical Physics》2005,51(3):265-270
The disagreement between the experimental and calculated positions of the first convergence zone are known from many publications. The most probable cause for such a disagreement, namely, the incorrect specification of the input data for the calculations, is considered. The lack of simultaneity between the hydrological surveys of the region and the acoustic experiments is emphasized. The experimental data obtained by the author in five ocean regions are presented. These data characterize the diurnal variability of the distance from the source to the nearest boundary of the convergence zone. The relations proposed by different researchers for calculating the sound speed from the temperature, salinity, and hydrostatic pressure are analyzed. It is shown that these relations lead to a substantial difference in the estimated depth dependence of the hydrostatic gradient of the sound speed. The position of the first convergence zone is calculated for the propagation conditions determined by vertical temperature and salinity profiles with the subsequent recalculation of these profiles into sound speed profiles by using eight different formulas known from the literature. It is shown that different formulas lead to different values of the distance to the first zone; this difference is substantially greater than that between the calculations and experiment. The necessity of improving the recalculation relations in view of the experimental data on sound propagation in natural oceanic waveguides, including the data on the actual positions of the convergence zones, is emphasized. 相似文献
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J. Šlechta 《Czechoslovak Journal of Physics》1968,18(10):1299-1308
On the basis of the classical theory of radiation produced in incomplete Coulomb interaction, a formula is derived for the coefficient of the bremsstrahlung of fully ionized plasma. In the region of rectilinear approximation a comparison is made with the results of the quantum formula derived from the Born approximation. Furthermore, the influence of dispersion upon the emission coefficient is taken into account; some relations for the region of dispersion are given. 相似文献
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The investigation was made of the dependence of the intensity of Tl, Ga, Mo, Mg, Mn, Sn, Bi, Ni, Zn, Pt and Au spectral lines and the plasma parameters (temperature T, electron concentration ne, degree of 6 ionnization α) from concentration of lithium additive. 相似文献
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SJ Rose 《Contemporary Physics》2013,54(2):109-121
In this paper we describe experiments conducted with high-power lasers that are attempting to replicate, for a very short time and in miniature, conditions found in the Sun. Experiments to date have reached conditions in the outer part of the Sun. To reach the Sun's centre requires compression of material to very much greater than solid density and heating to over ten million degrees. To achieve this, a new class of experiments and a new generation of high-power lasers are required. 相似文献
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Technical Physics - The object of this work is the apokamp—a new type of plasma jet, which is formed from a bright offshoot emerging at the bending point of a channel of a high-voltage... 相似文献
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We consider associated production of squarks and gluinos with the lightest supersymmetric particle (LSP), or states nearly degenerate in mass with it. Though sub-dominant to pair production of color SU(3)-charged superpartners, these processes are directly sensitive to the wavefunction composition of the lightest neutralinos. Exploiting event-shape variables - including some introduced here for the first time - we are able to identify the composition of the LSP by selecting events involving a single high-pT jet recoiling against missing transverse energy. We illustrate the proposed technique on a set of benchmark cases and propose methods for applying these results in more realistic experimental environments. 相似文献