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四川的大学《无线传感器网络及地的应用》17春在线作业2

四川的大学《无线传感器网络及地的应用》17春在线作业2
四川的大学《无线传感器网络及地的应用》17春在线作业2

一、单选题(共13 道试题,共32.5 分。)V 1. 在ZigBee技术中,物理层采用直接序列扩频(DSSS)技术,当频率采用868MHz时,使用()信道。

A. 单

B. 4

C. 10

D. 16

2. 在ZigBee技术中,物理层采用直接序列扩频(DSSS)技术,当频率采用 2.4GHz时,使用()信道。

A. 单

B. 4

C. 10

D. 16

3. 一个ZigBee网络可容纳多达()个从设备和一个主设备,一个区域内可同时布置多达

()个ZigBee网络。

A. 100;32

B. 100;64

C. 254;64

D. 254;100

4. 无线传感器网络的底层标准一般沿用无线个域网()的相关标准部分。

A. IEEE 802.5

B. IEEE 802.4

C. IEEE 802.15

D. IEEE 802.3

5. 在ZigBee技术中,物理层采用直接序列扩频(DSSS)技术,当频率采用 2.4GHz时,能够提供()的传输速率。

A. 20kbps

B. 40kbps

C. 80kbps

D. 250kbps

6. 在ZigBee技术中,物理层采用直接序列扩频(DSSS)技术,当频率采用868MHz时,能够提供()的传输速率。

A. 20kbps

B. 40kbps

C. 80kbps

D. 250kbps

7. 在ZigBee技术中,物理层采用直接序列扩频(DSSS)技术,当频率采用915MHz时,使用()信道。

A. 单

B. 4

C. 10

D. 16

8. 传感器节点中,哪种单元能耗可以忽略()。

A. 处理器单元

B. 信息融合单元

C. 无线传输单元

D. 传感器单元

E. 电源管理单元

9. 动态电压调节要解决的核心问题是实现微处理器计算负荷与工作()之间的匹配。

A. 电流;频率

B. 电压;阻抗

C. 电压;频率

D. 电流;阻抗

10. 建立无线传感器网络与Internet或者其他外部网络的端到端的连接是()层。

A. 2

B. 3

C. 4

D. 5

11. ZigBee技术通常采用的频率是()。

A. 868MHZ

B. 915MHZ

C. 2.4GHZ

D. 3G HZ

12. 在ZigBee技术中,物理层采用直接序列扩频(DSSS)技术,当频率采用915MHz时,能够提供()的传输速率。

A. 20kbps

B. 40kbps

C. 80kbps

D. 250kbps

13. 在无线网络通信中,能量消耗E与通信距离d存在关系:E=kdn,通信能耗与距离的()次方成正比。

A. 网络层

B. 传输层

C. 链路层

D. 会话层

二、多选题(共27 道试题,共67.5 分。)V 1. 在电源模块设计中,下面()电池是唯一没有毒性的可充电电池。

A. 锂聚合物电池

B. 镍铬电池

C. 银锌电池

D. 镍锰电池

D

2. ZigBee网络系统的软件设计主要过程包括()。

A. 建立Profile

B. 初始化

C. 连接通信节点

D. 编写应用层代码

BD

3. 在源信息、传感器与环境之间的关系里,下面哪些是源信息()。

A. 源数据

B. 噪声

C. 源波形

D. 源图像

E. 杂波

CD

4. 节点连接度是指节点可探测发现的()个数。网络连接度是所有节点的()的平均值,

它反映了传感器配置的密集程度。

A. 邻居跳数

B. 邻居节点

C. 邻居层数

D. 邻居数目

D

5. 传感器节点通常由()部分组成。

A. 处理器单元

B. 信息融合单元

C. 无线传输单元

D. 传感器单元

E. 电源管理单元

CDE

6. 天线的设计主要从()三个指标来衡量天线的性能。

A. 天线增益

B. 天线噪声比

C. 天线效率

D. 电压驻波比

CD

7. ZigBee的逻辑设备按其功能可分为()。

A. 协调器

B. 路由器

C. 感应器

D. 终端设备

BD

8. 无线通信模块由()组成。

A. 传感器电路

B. 换能器

C. 无线射频电路

D. 天线

D

9. 在收集信息的过程中,如果各个节点单独地直接传送数据到汇聚节点,则是不合适的,

主要原因()。

A. 浪费通信带宽和能量

B. 节点离汇聚节点太远

C. 信号容易发生冲突

D. 降低信息收集的效率

D

10. 信息安全就是要保证网络中传输信息的安全性。对于无线传感器网络而言,具体的信息安全需求内容包括()。

A. 数据的格式

B. 数据的机密性

C. 数据鉴别

D. 数据的完整性

E. 数据的实效性

CDE

11. 在传感器网络的安全设计分析中,物理层面临的主要问题是无线通信的干扰和节点的沦陷,遭受的主要攻击包括()。

A. 病毒传播

B. 信息窃听

C. 拥塞攻击

D. 物理破坏

D

12. 目前已有几种成熟的传感器网络时间同步协议,其()被认为是三种最基本的传感器网络时间同步机制。

A. TINY/MINI-SYNC

B. TPSN

C. RBS

D. CDMA

BC

13. 在ZigBee技术中,通常它的网络层支持三种拓扑结构()。

A. 总线型(Bus)结构

B. 簇树型(ClusterTree)结构

C. 网状(Mesh)结构

D. 星型(Star)结构

CD

14. 在ZigBee技术中,通常它的有效覆盖范围是()~()之间。

A. 5m

B. 10m

C. 50m

D. 75m

D

15. ZigBee则定义了网络()规范。

A. 互联

B. 传输

C. 管理

D. 应用

BD

16. 根据数据融合是否基于应用数据的语义,将数据融合技术分为三类()。

A. 依赖于管理的数据融合

B. 依赖于应用的数据融合

C. 结合BD两种技术的数据融合

D. 独立于应用的数据融合

CD

17. 传感器节点中,哪种单元能耗比较大()。

A. 处理器单元

B. 信息融合单元

C. 无线传输单元

D. 传感器单元

E. 电源管理单元

C

18. IEEE 802.15.4定义了短距离无线通信的()规范。

A. 应用层

B. 物理层

C. 会话层

D. 链路层

D

19. 传感器节点中,哪种状态能耗比较大()。

A. 发送状态

B. 接收状态

C. 空闲状态

D. 休眠状态

BC

20. 传感器网络的安全性需求主要来源于()两个方面。

A. 后台安全

B. 通信安全

C. 信息安全

D. 融合安全

C

21. ZigBee技术具有那些特点()。

A. 低价格

B. 低速率

C. 低频率

D. 低功耗

E. 低干扰

BD

22. 根据数据进行融合操作前后的信息含量,可以将数据融合分为()两类。

A. 放大融合

B. 无损失融合

C. 信息修正融合

D. 有损失融合

D

23. 下面哪些内容属于数据融合()。

A. 数据发射

B. 情况评估和预测

C. 跟踪与识别

D. 数据后台处理

E. 数据关联

CE

24. 通常计算机网络的研究与设计方法包括()。

A. 分析方法

B. 数字方法

C. 实验方法

D. 模拟方法

CD

25. 后台管理软件通常由()四个部分组成。

A. 数据库

B. 数据处理引擎

C. 中间件

D. 图形用户界面

E. 后台组件

BDE

26. 在分布式系统中,时间同步涉及()两个不同的概念。

A. 网络时间

B. 局部时间

C. 物理时间

D. 逻辑时间

D

27. 数据融合的主要方法是()。

A. 优选法

B. 贝叶斯估计法

C. 统计决策理论

D. 神经网络方法

CD

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