GPS/CAPS双模定位解算的Kalman滤波算法

利用改进的自适应Kalman滤波算法实现GPS／CAPS双模卫星导航定位解算。首先，利用描述机动载体运动的“当前”统计模型建立GPS／CAPS双模定位的Kalman滤波模型，在此基础上结合Sage—Husa自适应滤波算法建立离散的自适应扩展Kalman滤波方程。然后，对该自适应滤波算法进行改进，当经收敛性判据判断滤波呈发散趋势时．切换至强跟踪Kalman滤波算法．既保证了滤波器的可靠收敛又保证了定位的精度和效率。最后的仿真结果表明．该算法县有效可行的．     

Definition of a practical multi-criteria procedure for selecting the best coagulant in a chemically assisted primary sedimentation process for the treatment of urban wastewater

Chemically assisted primary sedimentation (CAPS) or chemically enhanced primary treatment (CEPT) consists of adding chemicals in order to increase the coagulation, flocculation and sedimentation of raw wastewater. Over the last twenty years, the use of CAPS has increased due to the development of better coagulants and flocculation enhancers, stricter standards as well as the need for low-energy treatment technologies, especially in developing countries. This paper defines a very simple multi-criteria procedure to be used in order to select the best combination of coagulant and dose when using jar tests. It is based on the adoption of the following 5 criteria: COD percentage removal, sludge volume after 2 h, coagulant dose, coagulant cost, pH percentage variation. The mathematical affordability of the procedure was tested by comparing it with the well known analytic hierarchy process.     

A CAPS Marker that Distinguishes the Barley Yellow Mosaic Disease Resistance Locus rym1 Derived from Chinese Landrace ‘Mokusekko 3’

A Cleaved Amplified Polymorphic Sequences (CAPS) marker has been developed from a restriction fragment length polymorphism (RFLP) marker probe, MWG2134, of barley. This CAPS marker can easily distinguish varieties resistant to Barley Yellow Mosaic disease from susceptible varieties. This suggests that our CAPS marker is useful in distinguishing rym1‐carrying varieties from non‐carrying ones. The results obtained with this marker were compared with resistance tests performed on infested fields. The molecular assay corresponded well with the resistance tests in all varieties/lines and, therefore, it is helpful in distinguishing rym1 in lines in which other rym genes or quantitative trait loci are present.     

基于Socket的卫星地球站数据管理系统

本文简要介绍了基于CAPS系统的海洋环境卫星监测系统(CAPS-OC),研究了卫星地球站数据管理系统的实现方法,比较了单接收机和多接收机两种模式下数据管理系统客户端软件和服务器端软件的框架设计,提出了基于Socket技术的多接收机管理系统框架。在Windows环境下采用WinSock控件实现了系统由单接收模式到多接收机工作模式的转变。结果表明,该工作模式结构设计合理,编写的系统软件性能稳定,运行可靠,大大提高了服务器对硬件资源的利用率,降低了卫星地球站的硬件成本和人力成本,为站点的业务化运行及未来系统的进一步升级提供了技术支持。     

CAPS-OC终端控制系统软件设计与实现

介绍CAPS-OC终端在海洋资料浮标观测系统中的工作原理及在海洋资料浮标上的工作过程,阐述CAPS-OC终端控制系统软件的设计与实现,并对其中的多串口芯片关键技术进行说明。通过对CAPS-OC终端在大型锚系浮标观测系统上的双向通信和定位实验,结果表明,CAPS-OC终端及核心控制软件具有良好的稳定性和可靠性。     

移动互联时代的EVDO无线网络信令处理能力探讨

通过对网络主流设备的主要信令流的分析,得到适合不同话务模型下的信令处理能力评估方法,同时通过评估测试,得到主流设备处理瓶颈及能力大小的参考。     

降雨对于CAPS微小卫星终端通信的影响

中国区域卫星定位系统（CAPS）是卫星导航通信一体化的系统。当利用CAPS微小卫星终端系统进行卫星通信时,所用的天线口径极小,增益低,终端的有效全向辐射功率EIRP。较小,整个通信链路的余量较小。虽然C波段的降雨衰减远没有Ku波段大,但是相对于微小卫星终端的整个卫星通信链路来说,降雨带来的信号衰减、地球站接收天线G／T值的变化以及对卫星通信上、下行链路载噪比的影响也是不可忽视的。文章对这些影响进行了分析,并利用ITU—R给出的降雨衰减预报模式,给出了C波段的降雨衰减的计算方法及结果,并且分析了降雨对CAPS微小卫星通信系统的整个链路余量的影响。     

Characterisation of a thermostable family 42 β-galactosidase (BgalC) family from Thermotoga maritima showing efficient lactose hydrolysis

A β-galactosidase gene (TM_1195) of Thermotoga maritima was cloned and expressed in Escherichia coli. The recombinant β-galactosidase (BgalC), belonging to glycosyl hydrolase (GH) family 42, was purified to homogeneity with 23.4-fold purification and a recovery of 36.6%. Its molecular mass was estimated to be 78 kDa by SDS–PAGE. BgalC exhibited maximum activity at an optimal pH of 5.5 and an optimum temperature of 80 °C. The enzyme displayed important properties, such as stability over a broad pH range of 5.0–9.0 and thermostability up to 75 °C. K_m values of BgalC for p-nitrophenyl-β-galactopyranoside (pNPGal), o-nitrophenyl-β-galactopyranoside (oNPGal) and lactose were 1.21, 7.31 and 6.5 mM, respectively. BgalC was efficient in complete removal of lactose from milk. BgalC is significantly one of the few β-galactosidases from family 42 displaying significant hydrolysis of lactose. These properties make BgalC an ideal candidate for commercial use, in the production of lactose-free milk.     

Fast template matching using correlation‐based adaptive predictive search

We have developed the Correlation‐based Adaptive Predictive Search (CAPS) as a fast search strategy for multidimensional template matching. A 2D template is analyzed, and certain characteristics are computed from its autocorrelation. The extracted information is then used to speed up the search procedure. This method provides a significant improvement in computation time while retaining the accuracy of traditional full‐search matching. We have extended CAPS to three and higher dimensions. An example of the third dimension is rotation where rotated targets can be located while again substantially reducing the computational requirements. CAPS can also be applied in multiple steps to further speed up the template matching process. Experiments were conducted to evaluate the performance of 2D, 3D, and multiple‐step CAPS algorithms. Compared to the conventional full‐search method, we achieved speedup ratios of up to 66.5 and 145 with 2D and 3D CAPS, respectively. © 2003 Wiley Periodicals, Inc. Int J Imaging Syst Technol 13, 169–178, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/ima.10055     

CAPS气压测高的仿真分析

CAPS气压测高可以获取用户所在位置的高度,结合该气压测高技术,CAPS利用同步轨道(GEO)上的通信卫星构建导航星座实现用户的三维定位。针对区域用户,本文给出了CAPS气压测高的工作流程,并结合实测的气象参数,仿真分析了测高的精度。结果表明,仿真分析与实测的结果基本一致,CAPS气压测高的精度可以满足一般导航用户的需求。