Spacecraft rendezvous trajectory safety quantitative performance index eliminating probability dilution

In view of the probability dilution problem of the existing quantitative indexes of rendezvous trajectory safety performance using collision probability,this paper proposes a new quantitative index of rendezvous trajectory safety performance by well combining collision probability with warning threshold.The proposed new index increases monotonously as the position errors of the chaser spacecraft increase,therefore it can effectively overcome the problems of the reduction in the largest performance value and the advancement in the most dangerous time induced by the probability dilution.The proposed new index is applied to the safety design of close range rendezvous missions.The mission’s safety requirements for initial navigation precision and the safe region of initial and final keeping points’positions with a certain navigation precision are analyzed,and several valuable conclusions about the relation between position navigation precision and velocity navigation precision as well as the relation between keeping points’positions and navigation precision are obtained.     

Normal-distribution-test algorithm for range spread target detection

A range spread target detection algorithm based on the normal distribution test is proposed. Based on the fact that the range spread target signal generally does not follow normal distribution, the range spread target detection problem is equivalent to the normal distribution test problem. Analysis show that the normal distribution test detector has the characteristic of constant false alarm rate. The performance of the proposed detector is analyzed. Numerical experimental results based on simulation and measured high range resolution profile data show that the proposed detector outperform the energy integration detector.     

基于门限动态调整的最优协作检测方法

为提高协作频谱感知的检测效率、减少系统的反馈开销,提出一种基于门限动态调整的最优协作检测方法。在单节点检测错误概率最小的情况下,导出能量检测中门限值与信噪比的关系表达式,利用二分法求得不同信噪比下的动态门限值。根据系统恒虚警率和恒检测率计算最优协作用户数,并与动态门限值相结合得到系统检测错误概率。仿真结果表明,该方法协作检测概率较高,检测错误概率较低。     

Biochemical and behavioral evidence foe hybridization between fire ants,Solenopsis invicta andSolenopsis richteri (Hymenoptera: Formicidae)

Behavioral and biochemical evidence is presented for hybridization between the fire ants,Solenopsis richteri andS. invicta. The response of the two species to extracts of their trail pheromones presented as a point source is clearly species-specific; however, hybrid workers responded to parental Dufour's gland extracts and parental workers responded to Dufour's gland extracts of the hybrid. The behavioral evidence for hybridization was confirmed by gas Chromatograph comparison of the Dufour's gland extracts of the three fire ant forms, which showed a pattern for the hybrid that was intermediate to the two parental species.     

基于CAN总线的住宅小区安防系统

提出了一种基于CAN总线的住宅小区安防系统。在介绍CAN总线的主要特征的基础上，具体分析了该系统的结构和硬件接口，构建了TCAN总线的高层通信协议，并且阐述了系统的软件设计。该系统能够实时处理住宅小区内各种报警信息，具有可靠性高、通信速度快和成本低等特点，有广泛的市场应用前景。     

乙烯装置电加热器预防性维护

干气提浓乙烯装置脱氧系统、脱砷系统共有四台电加热器：E-402（600kW）、E-404（560kW）、E-406（500kW）、E-407（200kW）。该电加热器自投用以来运行平均每5分钟就会出现一次内部超温报警，电加热器自保停机，每次停机后需要人工现场复位，等待内部温度降到设定温度后才能重新本文从介绍电加热器的工作原理入手，分析其在：工艺中加热方式，找出影响加热器不能稳定工作的原因。     

ROK101007蓝牙模块及其在无线火灾自动报警系统中的应用

ROK101007是Ericsson公司生产的一种实现蓝牙功能的中短距离通信模块.从应用的角度出发,将ROK101007作为通信模块集成到无线火灾自动报警系统中,对蓝牙技术在火灾报警中的应用进行了探讨和研究,并给出了火灾自动报警系统原理框图和ROK101007与单片机及上位机的接口电路,及相应的主要软件设计方法.     

多路热释电红外智能检测报警装置

被动型热释电红外报警器把红外线的隐蔽性很好地应用于报警系统中。利用热释电红外传感器作为探头，进行非接触式远距离检测，将感测到的红外信息转换成电压信号，经过单片机处理，完成数码显示和语音报警功能，从而实现了防盗报警功能，达到了安全防护的目的。     

GSM无线数据传输在消防系统中的应用

介绍了一种基于GSM系统短消息机制的无线数据传输方式在消防系统运行监视中的应用,及短消息模块与单片机系统的接口电路设计。无线数据传输方式为消防系统的及时报警和排除故障提供了可靠的技术保证。     

基于数据融合智能检测的家居安全报警系统的设计

文章介绍了多传感器数据融合技术、智能检测系统的特点及智能家居安全报警系统软件的设计方法。文章采用PC机不同键盘信号来代替各传感器实时采集家庭的水、煤气、电、火情、偷盗、健康、抢劫、空气质量等报警信号。从键盘上直接输入信号，通过PC板卡型处理器，并进行数据融合后，做出正确的判断，从而根据不同的信号发出不同的报警响声。这种家用智能安全报警软件除可用于家庭外，也可用于大型室外设施场所。