荧光定量PCR技术在环境微生物检测中的应用

阐述了实时荧光定量PCR技术的原理、特点及其在环境微生物检测中的应用与研究进展,分析了该技术在环境微生物检测中存在的问题,并探讨了存在的问题,以及其发展和应用前景。     

探空火箭时差定位及定位算法研究

面对空间环境监测日益增多的需求,而常用的接收、跟踪定位设备却比较笨重且灵活性差,不能满足既机动灵活又适合于多种场合的要求.据此提出了一种基于时差定位(TDOA)的探空火箭定位方法及约束加权最小二乘定位算法.该方法具有接收可靠、移动灵活、定位精度高、成本低等特点,可用于多种场合的探空火箭定位、数据接收和处理.      

基于特征参数趋势进化的故障诊断和预测方法

 采用时间序列方法对可以表征系统故障状态的特征参数的趋势进化进行预测,同时考虑特征参数的概率分布特性,给出了对系统进行故障诊断和预测的方法。在已获得特征参数监测数据的基础上,分别对具有广义强度/故障阈值确定分布或故障模式特征参数空间分布两种形式的故障判据,提出了利用二次指数平滑预测模型对系统未来某时刻的故障状态进行预测的方法。给出包括故障概率和故障指数在内的故障诊断和预测结果形式,可进一步为系统的维修决策等提供参考。     

A new technique for direction of arrival estimation for ionospheric multipath channels

A novel array signal processing technique is proposed to estimate HF channel parameters including number of paths, their respective direction of arrivals (DOA), delays, Doppler shifts and amplitudes. The proposed technique utilizes the Cross Ambiguity Function (CAF), hence, called as the CAF-DF technique. The CAF-DF technique iteratively processes the array output data and provides reliable estimates for DOA, delay, Doppler shift and amplitude corresponding to each impinging HF propagated wave onto an antenna array. Obtained results for both real and simulated data at different signal to noise ratio (SNR) values indicate the superior performance of the proposed technique over the well known MUltiple SIgnal Classification (MUSIC) technique.     

CFM56系列发动机部件技术综述

综述了CFM56系列大涵道比发动机在风扇叶片、防冰、吞水、燃烧室、尾喷管方面所采用的结构技术。     

MEMS陀螺仪随机漂移仿真和试验

为了提高使用精度,研究了某微机电系统(MEMS,Micro Electro Mechanical System)陀螺仪的随机漂移模型.应用时间序列分析方法对经过预处理的陀螺仪量测数据进行建模,提出采用状态扩增法设计Kalman滤波器.进行速率试验和摇摆试验,验证了在静态和恒定角速率条件下,滤波后的误差均值和标准差分别为滤波前的55%和12%.针对在摇摆运动时随着振幅的增加滤波效果下降的问题,设计了自适应Kalman滤波器,分析了衰减因子的选取原则.仿真结果表明:常值衰减因子法和自适应衰减因子法都能显著改善摇摆运动时的滤波效果,而自适应衰减因子法的精度更高.     

CBERS-02B卫星TDICCD相机的相对辐射定标方法及结果

文章根据CBERS-02B卫星TDICCD相机(简称HR相机)的特点,介绍HR相机的辐射定标方案,并对试验结果进行分析和比较,最后给出了HR相机的在轨辐射校正方案。该方案已经成功应用于HR图像数据的相对辐射校正,对于其它TDICCD相机的相对辐射校正具有参考意义。     

"空中列车"系统的研究与设计

本文主要介绍了“空中列车”系统的研究与设计,即采用一艘动力艇牵引几艘拖艇的多艇串联的方法,对飞艇的总体和局部进行了研究与设计。     

Design and experiment of onboard laser time transfer in Chinese Beidou navigation satellites

High-precision time synchronization between satellites and ground stations plays the vital role in satellite navigation system. Laser time transfer (LTT) technology is widely recognized as the highest accuracy way to achieve time synchronization derived from satellite laser ranging (SLR) technology. Onboard LTT payload has been designed and developed by Shanghai Astronomical Observatory, and successfully applied to Chinese Beidou navigation satellites. By using the SLR system, with strictly controlling laser firing time and developing LTT data processing system on ground, the high precise onboard laser time transfer experiment has been first performed for satellite navigation system in the world. The clock difference and relative frequency difference between the ground hydrogen maser and space rubidium clocks have been obtained, with the precision of approximately 300 ps and relative frequency stability of 10E−14. This article describes the development of onboard LTT payload, introduces the principle, system composition, applications and LTT measuring results for Chinese satellite navigation system.     

GPS载波相位时间传递软件的实现

研究了基于精密单点定位原理的GPS载波相位时间传递方法的数学模型和数据处理方法,设计了相应的程序流程,并基于Visual C++和Fortran混合编程的方式编写了相应的计算程序GPSCPTT V1.0。采用实际观测数据进行实验验证,结果表明,软件可以实现高精度的时间传递。