基于微服务架构的高精度室内外综合位置服务平台设计

给出了一种高精度、综合性位置服务平台设计方案,该方案将北斗高精度定位技术、惯性导航技术及融合室分UWB等技术相结合,采用微服务架构集成多种定位产品,集位置解算、电子围栏、路径导航、多源数据融合分析等多种服务为一体,可为用户提供服务弹性扩展、功能模块敏捷开发和快速发布,同时采用“边云融合”方式部署满足大容量并发处理承载能力,并在智慧港口领域进行了试点应用,验证了平台性能。积极探索5G与北斗技术的融合共建,助力产业互联网发展。     

High-precision numerical integration: Progress and challenges

One of the most fruitful advances in the field of experimental mathematics has been the development of practical methods for very high-precision numerical integration, a quest initiated by Keith Geddes and other researchers in the 1980s and 1990s. These techniques, when coupled with equally powerful integer relation detection methods, have resulted in the analytic evaluation of many integrals that previously were beyond the realm of symbolic techniques. This paper presents a survey of the current state-of-the-art in this area (including results by the present authors and others), mentions some new results, and then sketches what challenges lie ahead.     

近距离高精度汽车定点定位通信系统

针对汽车GPS通信系统在近距离定位上的精度问题,设计了一种近距离高精度定位辅助系统,并实现了周围汽车高效实时的通信。该系统利用超声波测距技术获得汽车之间的距离,并计算相对角度。通过有效的通信初始化算法与动态更新算法,将此数据与设备通信地址进行绑定,生成完整的节点信息。对节点信息进行处理,实时构建汽车周围环境的二维平面图,从而实现汽车近距离选择性通信的目的。     

Precision position control using combined piezo-VCM actuators

This paper presents the control performance of a high-precision positioning table using the hybrid actuators composed of the piezoelectric (PZT) actuators and voice-coil motors (VCMs). The combined piezo-VCM actuator features two main characteristics, i.e., a large operation range due to the long stroke of VCM, and a high precision and heavy load positioning ability due to the actuation of PZT impact force. In this paper, a one-degree-of-freedom (1-DOF) experimental setup was configured to examine the control performance and the parametric identification for the VCM was performed based on the recursive-least-square (RLS) method. The control performance was effectively demonstrated by using a switching controller configured by an integral variable structure controller (IVSC) for the VCM to conduct rough position control and an impact force controller (IFC) for the PZT actuator to conduct fine position control. The experimental results showed that the positioning table having mass 881 g was successfully positioned within the positioning accuracy of 10 nm by both the forward and backward positioning processes. In the forward control, it totally took 1.253 s for the sliding table to reach the target position of 450 μm; in the backward control, it took 1.387 s for the sliding table moving from the position of 450 μm to the target position of 200 μm.     

High-precision and ultrafast UV laser system for next-generation flexible PCB drilling

Since conventional mechanical punching technology for Flexible Printed Circuit Board (FPCB) drilling has restricted via-hole size and depth control for multi-layer circuit boards, CO₂ and Ultra Violet (UV) laser drilling technologies have been developed. However, the FPCBs for mobile phones and Personal Digital Assistants (PDAs) require smaller via-hole diameters, since the development of thinner and higher circuit density devices is demanded. Currently, UV laser systems are widely used for FPCB drilling of 75–105 μm diameter via-holes and inspectors performs quality test manually using microscopes. We developed a high-precision UV laser microfabrication system for next-generation FPCB drilling of 15 μm diameter via-holes. The degrees of the precision of the microfabricated via-holes of 15, 35, 50 and 85 μm were mean absolute error rate of 4.4, 2.2, 2.3, and 2.2 which was fully satisfied with industrial inspection specification ±10%. The drilling speed of the system of 2800 via-holes per second at stationary state was achieved. In addition, we applied modified Greedy 2-opt algorithm to find out optimal drilling path which reduced the total time of via-hole fabrication. We successfully reduced the production time by 25% compared with the result obtained in the normal Greedy 2-opt algorithm. Moreover, we designed very accurate inspection method using Canny edge detection and geometric pattern matching algorithms and successfully applied it to the Automated Optical Inspection (AOI) module for the inspections of 15 μm diameter via-hole which was required for the fabrication of high density FPCB.     

Fabrication of arrays of line with nanoscale width and large length by electron beam lithography with high-precision stage

Fabrication of arrays of line with a nanoscale width less than 150 nm and length over 1500 μm on SU8 resist was proposed when using SEM-converted exposure system with high-precision positioning stage. Investigating the effect of the stage movement and the local-aperture contamination on stitching errors, we found that changing the deflector gain factors and the cleaning aperture after each exposure made it possible to improve stitching accuracy. Overlapping length 200 nm of line arrays was obtained with increase of 0.35% in x direction and 0.16% in y direction for deflection gain factors.     

High-precision measurement of weld seam based on narrow depth of field lens in laser welding

In laser beam welding, when the width of weld seam is less than 0.1?mm, present vision sensor-based measurements can barely obtain the seam width and seam position stably and reliably. A seam measuring method based on narrow depth of field (NDOF) is proposed in this article, which aims to detect this kind of narrow and small weld seam with great accuracy. This measurement system consists of a multiple optical magnifier, a Charge-Coupled Device/Complementary Metal Oxide Semiconductors (CCD/CMOS) camera, and an external light-emitting diode lighting unit. First, the principle of the NDOF method is explained. Second, key features of weld seam are extracted by image-processing algorithm. Lastly, the result of experiment reveals that the NDOF method can meet the demanded detection precision. Measurement accuracy for the seam width and seam position is 6 and 8?μm, respectively.     

基于高斯投影的高精度距离保障研究

为解决远程火力打击中的高精度距离保障问题，分析研究高斯投影引起的长度变形。以我国东南地区一点为例，通过修正方法、应用实例探讨对坐标逆运算结果处理方法。结果表明，该方法简便实用，满足精度要求，且能将距离误差缩小到允许误差范围以内。     

高分辨率图象实时数据采集及与微机接口

ＣＣＤ图象的解调测量法可以实现图象边缘点的高分辨率检测，达到高精度尺寸测量的目的。采用这种方法测量数据的产生速率由高频电子细分频率决定，数据量上被测量 图象中需检测的边缘点的多少决定。本文介绍了测量图象边缘间距或中心距ＣＣＤ图象解调测量法的数据采集、存贮和与微机接口方法。实现高精度、高速度、多边级点大数据量数据的实时有效采集及存贮，并可以和微机系统接口。     

内蒙古二连盆地腾格尔坳陷南缘巴彦塔拉矿床成矿地球化学研究

在多次野外踏勘取样和大量地质资料研讨的基础上研究了潜水氧化带型铀矿床的成矿特征,并按照铀元素成矿过程“源、运、积”的演化轨迹,对矿床成矿机理进行深入探讨,并按照不同成矿阶段,对成矿作用进行定量判别;对该区二次还原成矿作用以及潜水转层间的特殊成矿模式进行归纳和总结;对蚀源区花岗岩体开展古铀场和铀差场研究,取得了新的认识和成果。开展的高精度磁法测量对查明支谷底部基岩起伏变化和埋深,以及划分支谷边界、探测深部构造均提供了重要依据。