粗精匹配结合的矢量道路辅助惯性导航算法

针对无源环境下无法采用卫星导航定位方式对惯性导航系统的累积误差进行修正的问题,提出一种采用高精度的矢量道路数据进行粗精匹配的导航校正算法。该方法首先通过分析惯导轨迹的特征标示点以及外接矩形,剔除明显的误匹配道路和冗余道路,获取待匹配道路集合;进而,结合ICCP算法具有匹配精度较高,匹配结果较稳定的优点,完成惯导轨迹位置误差的补偿和校正;最后,根据匹配方差和历史匹配轨迹对匹配结果的准确性进行分析和判断。仿真实验结果表明,该算法能够提高惯性导航定位误差的校正精度,减少在复杂道路交叉口等情况的误匹配。     

基于路网惯导载体路径匹配的ICCP算法改进

惯性导航作为一种独立、便捷、稳定的导航方式,在众多对导航定位有特殊要求的领域正发挥着难以替代的作用。但惯性导航的误差会随时间逐渐积累,以至于出现较大偏差,直接影响了导航定位效果,因而在实际应用中是否能准确快速实时修正定位误差至关重要。针对目前普遍使用的轨迹匹配方法 ICCP算法,在数字化路网中惯导机动载体的路径匹配基础上对该算法的几个主要环节进行了改进。最后对照实验进行验证,实验表明,改进后算法的效率和精度有了显著提高。     

利用ICCP的水下地磁匹配导航算法

分析了传统水下导航定位方法的局限,研究了基于ICCP的水下地磁自主导航算法。首先,研究了局域地磁场建模方法,认为多面函数构建局域地磁场模型较优;然后,研究了ICCP地磁导航算法,并对其作了改进;最后,以所建立的局域地磁场模型为背景,进行了地磁匹配算法的仿真实验,给出了该算法的精度指标及影响因素。     

ICCP重力匹配算法在局部连续背景场中的实现

提出了在具有统一解析式连续背景场基础上实现迭代最近等值线的匹配算法,建立了局部连续背景场的最近点搜索模型,采用BFGS拟牛顿方法实现置信范围内最近等值点精确定位。分别对连续背景场的ICCP匹配算法和离散背景场的ICCP匹配算法进行了两组对比仿真实验。实验结果表明,连续背景场的IC-CP匹配算法在搜索最近等值点方面有了较大改进,匹配精度有了较大提高。     

不同地磁匹配导航算法比较研究

地磁匹配导航的关键技术之一是稳定高效的匹配算法。本文将ICCP算法与蚁群智能算法在地磁匹配导航中的应用效果进行了仿真实验。实验结果表明:ICCP算法具有较好的全局性,但算法复杂,导致实效性差;蚁群算法搜索效率高,实效性强,具有较强的适用性和鲁棒性。从这个角度来说,蚁群算法更加适合于地磁匹配导航。     

利用改进的ICCP算法辅助导航

文中研究了ICCP算法的基本原理,分析了ICCP算法的特点,针对ICCP实时性差的不足,借鉴计算机编程思想中的移位寄存器原理给出了改进ICCP算法,同时,改进ICCP算法中每个采样点都可以有多个匹配结果,通过对这些匹配结果求加权平均可以有效消弱结果中的随机误差,从而提高了匹配的可靠性。并通过一个仿真实例,表明改进ICCP算法可以有效改善ICCP算法的实时性,经度方向精度与ICCP算法相当,纬度方向精度有明显的提高。     

利用TERCOM与ICCP进行联合地磁匹配导航

为解决地磁匹配导航中TERCOM算法精度较差I、CCP算法容易产生局部收敛且匹配速度较慢的缺陷,提出了一种联合TERCOM与ICCP的水下地磁匹配导航新方法。对此算法中的粗匹配及其性能进行了分析,同时,对精匹配及改进ICCP算法进行了研究,解决了传统匹配导航算法精度、速度及完备性不能兼得的问题。     

基于ICCP匹配算法的海底地形匹配辅助导航

利用海底地形辅助导航是水下载体导航技术致力研究的新方向,采用ICCP算法作为对准匹配算法,利用实测地形数据和已知地形数据库,进行仿真计算,修正惯性导航系统累计误差,得到水下载体的最佳匹配位置,以提高水下载体的导航精度。     

基于Matcom混合编程的ICCP算法仿真实现

阐述了利用Matlab和Visual C++实现ICCP算法的优缺点,提出了Matcom和Visual C++混合编程实现ICCP算法的新方法。利用Matcom提供的函数库,在Visual C++环境下实现了ICCP算法仿真系统。该方法较大地改善了复杂算法仿真系统的开发效率,最终的仿真效果也较好地吻合了理论要求。     

Influence of particle and surface quality on the vitrinite reflectance of dispersed organic matter: Comparative exercise using data from the qualifying system for reflectance analysis working group of ICCP

The development of a qualifying system for reflectance analysis has been the scope of a working group within the International Committee for Coal and Organic Petrology (ICCP) since 1999, when J. Koch presented a system to qualify vitrinite particles according to their size, proximity to bright components and homogeneity of the surface. After some years of work aimed at improving the classification system using photomicrographs, it was decided to run a round robin exercise on microscopy samples. The classification system tested consists of three qualifiers ranging from excellent to low quality vitrinites with an additional option for unsuitable vitrinites. This paper reports on the results obtained by 22 analysts who were asked to measure random reflectance readings on vitrinite particles assigning to each reading a qualifier. Four samples containing different organic matter types and a variety of vitrinite occurrences have been analysed. Results indicated that the reflectance of particles classified as excellent, good or poor compared to the total average reflectance did not show trends to be systematically lower or higher for the four samples analysed. The differences in reflectance between the qualifiers for any given sample were lower than the scatter of vitrinite reflectance among participants. Overall, satisfactory results were obtained in determining the reflectance of vitrinite in the four samples analysed. This was so for samples having abundant and easy to identify vitrinites (higher plant-derived organic matter) as well as for samples with scarce and difficult to identify particles (samples with dominant marine-derived organic matter). The highest discrepancies were found for the organic-rich oil shales where the selection of the vitrinite population to measure proved to be particularly difficult. Special instructions should be provided for the analysis of this sort of samples. The certainty of identification of the vitrinite associated with the vitrinite reflectance values reported has been assessed through a reliability index which takes into account the number of readings and the coefficient of variation. The same statistical approach as that followed in the ICCP vitrinite reflectance accreditation program for single seam coals has been used for data evaluation. The results indicated low to medium dispersion for 17 out of 22 participants. This, combined with data from other sets of comparative analyses over a long period, is considered an encouraging result for the establishment of an accreditation program on vitrinite reflectance measurements in dispersed organic matter.