用磁场传感器KMZ52设计的电子指南针

介绍了目前用于定位系统中的电子指南针的工作原理，详细论述了磁场传感器芯片KMZ52的工作原理，给出了用KMZ52磁场传感器设计电子指南针的总体设计方案和电路，同时给出了设计中的一些特殊处理方法。     

Compass、GPS和Galileo系统集总增益系数仿真分析

集总增益系数是GNSS系统间干扰分析的重要参数,需要通过仿真计算得到。介绍了集总增益系数仿真算法,利用Visualyse Professional软件构建仿真系统,仿真分析了Compass、GPS和Galileo系统不同信号的集总增益系数。计算结果的准确性已在国际电联新增导航频段609决议磋商会中得到了验证。该仿真分析方法为开展GNSS系统间干扰分析提供了一种快捷有效的手段。     

全球定位系统（GPS）技术的发展现状及未来发展趋势

文章对当前GPS技术的发展现状和未来发展趋势进行了研究和探讨,首先指出了当前GPS技术发展的三个特点,然后对GPS技术的发展趋势进行了大胆的预测和展望,提出未来GPS技术发展的四大特点。     

一种5G移动通信干扰信号定位系统

当前,运营商5G网络的部署涉及大量的频段重耕,5G行业业务又面临复杂的电磁环境,如何准确、高效的定位5G干扰源是目前业内聚焦的重要课题.本文设计了一种5G移动通信干扰信号定位系统,创新使用了方位双定向、四天线接收和高精度筛选定位等多项技术方法,能实时、高精度地定位干扰源位置,并实现了测试、分析和派单全流程的自动化处理,...     

Data/pilot combination strategies for Compass B1C signal acquisition

The new Compass B1C signal, with a power ratio of the data channel to the pilot channel of 1:3, adopts BOC(1,1) in its data channel; a new modulation, namely, a quadrature multiplexed binary offset carrier (QMBOC) in its pilot channel modulates the narrowband BOC(1,1) and the wideband BOC(6,1) components in phase quadrature with each other. To fully exploit the B1C signal and to improve the acquisition sensitivity in a degraded signal or an indoor environment, this paper proposes to combine the data and the pilot channels for B1C signal acquisition. The noncoherent, coherent, and differential coherent strategies are considered for application in the B1C signal. Considering the power inequality between the data and the pilot channels, the maximum signal‐to‐noise ratio combination (MRC) is utilized in these strategies to obtain an optimal combination. This paper also proposes to simplify the differential coherent strategy to obtain a better anti‐noise performance under stable conditions. The computer simulation results are given to verify the theoretical expressions, and some discussions with respect to the proposed strategies are provided.     

基于Android平台飞机罗盘校准系统软件的实现

为了解决了航空磁罗盘校准精度、效率低下问题,设计一套基于Android系统的面向各种飞机罗盘校准系统,此系统由座舱显控单元、牵引车显控单元、基准罗盘单元等组成,各单元通过WIFI无线网络进行通讯。对飞机上磁罗盘、光纤捷联航姿、无线电罗盘三方面进行精准校准。校准设备精度为不低于0.5°,设备供电采用锂电池供电工作时间不小于8小时。校准首次采用8点校准、12点校准两种校准模式,大大提高了罗盘校准精度。此系统对罗盘校准场地要求低,制造成本低、操作界面清晰,逻辑结构简单、科技含量高。通过对多机型的罗盘校准,确定比传统罗盘校准用时短、效率高,劳动强度低,达到很好的预期。     

基于遗忘因子递推最小二乘的无人机在线磁补偿技术研究

针对无人机飞行过程中,由于载体非平稳磁场干扰造成磁测航向角不准确的问题,提出一种结合遗忘滤波的递推最小二乘在线磁补偿方法.在分析了软、硬磁干扰机理和建立磁干扰模型的基础上,对常规递推最小二乘法加入遗忘因子修正,从而抑制磁场变化对磁补偿参数估计效果的影响.仿真和试验结果表明,在磁干扰较强且干扰磁场存在突变的情况下,此算法可以将磁航向角RMSE减小至3.8220°.该方法计算量较小,能够有效适应机载条件下的变化磁场补偿,并达到较高的航向角精度要求.     

基于北斗可穿戴式老人心率检测仪

为了实时检测老人在户外的心率健康状况,设计了一种基于北斗的心率检测仪.当老人心率异常时,可以通过穿戴式检测设备及时通知老人的监护人和医护人员,并告知确切的位置,以获得最快的医治.系统由心率信号采集与处理、GSM模块通信、北斗定位、STM32F405组成,实现对心率信号实时采集与处理,远程监护老人心率健康与定位,对北斗民用化在便携式医疗中的应用有一定的参考意义.     

多功能电池灯

多功能电池灯是长江电源厂最近研制的一种新产品,它具有照明、闪光、聚光、收音、计时(或指南针)等多种功能。本文介绍了多功能电池灯的结构和性能,这是一种设计合理、结构紧凑、性能优良的新产品。     

ColorED: Color edge and segment detection by Edge Drawing (ED)

We extend our recent edge and segment detector, Edge Drawing (GrayED), to detect edge segments in color images. Edge Drawing for color images, named ColorED, takes in a color image, and outputs a set of edge segments, each a contiguous, 1-pixel wide chain of pixels. Detected edge segments are then passed through an ‘a contrario’ validation step due to the Helmholtz principle to eliminate perceptually invalid detections. We quantitatively evaluate ColorED with different colorspaces and vector gradient operators within the precision-recall framework of the widely-used Berkeley Segmentation Dataset and Benchmark (BSDS300), and compare its results with those of GrayED and a color version of the Canny edge detector named ColorCanny. We conclude that color edge detection is in general superior to grayscale edge detection, and that ColorED with edge segment validation (ColorEDV) greatly outperforms GrayED, ColorED, and ColorCanny, producing an F-score of 0.6593 with DiZenzo and 0.6747 with the Compass operator while taking an average time of 31.5 ms for BSDS300.