航海仪器题库旧

航海仪器题库旧
航海仪器题库旧

第七章航海仪器

7.1 现代定位电子仪器

7.1.2 GPS/DGPS卫星导航系统

7.1.2.1 GPS/DGPS卫星导航系统工作原理、精度及在航海上的使用注意事项

2713. GPS卫星导航系统分为距离型、多普勒型和距离多普勒混合型系指按分类。

A.工作方式

B.工作原理

C.测量的导航定位参量

D.用户获得的导航定位数据

2714. GPS卫星导航系统是导航系统。

A. 近距离

B.远距离

C.中距离

D.全球

2715. GPS卫星导航系统是一种卫星导航系统。

A.多普勒

B.测距

C.有源

D.测角

2716. GPS卫星导航仪可为定位。

A.水上、水下

B.水下、空中

C.水面、海底

D.水面、空中

2717. 卫星的导航范围可延伸到外层空间,指的是从。

A.地面

B.水面

C.近地空间

D.A+B+C

2718. GPS卫星导航系统可为船舶在。

A.江河、湖泊提供定位与导航

B.港口及狭窄水道提供定位与导航

C.近海及远洋提供定位与导航

D.A+B+C

2719. GPS卫星导航仪可为。

A.水下定位

B.水面定位

C.水面、空中定位

D.水下、水面、空中定位

2720. GPS卫星导航可提供全球、全天候、高精度、。

.连续、不实时定位与导航A

B.连续、近于实时定位与导航

C.间断、不实时定位与导航

D.间断、近于实时定位与导航

2721. GPS卫星导航系统可提供全球、全天侯、高精度、连续导航。 A.不实时

B.近于实时

C.水下、水面

D.水下、水面、空中

2722. GPS卫星导航系统可提供全球全天侯高精度导航。

A.不实时

B.连续近于实时

C.间断不实时

D.间断近于实时

2723. GPS卫星导航系统与NNSS卫星导航系统相比较,其优点是。 A.连续定位

B.定位精度高

C.定位时间短

D.A+B+C

2724. GPS卫星导航系统由部分组成。

A.2

B.3

C.4

D.5

2725. GPS卫星导航系统由颗卫星组成。

A.24

B.18

C.30

D.48

2726. GPS卫星分布在个轨道上。

A.3

B. 6

C.18

D.24

2727. GPS卫星导航系统共设置颗GPS卫星,分布在个轨道上。

A.21+3,8

B.18+3,6

C.21+3,6

D.18+3,8

2728. GPS卫星的轨道高度为千米。

A.1946

B.1948

C.1100

D.20183

2729. GPS卫星运行的周期为。

A. 3小时

B.6小时

C.12小时

D. 106分钟

2730. GPS卫星导航系统的卫星运行周期为。

A.3小时

B.约12小时

C.6小时

D.106分钟

2731. GPS卫星经过某一地区上空,每天约提前分钟。

A.3

B.4

C.3~5

D. 30

2732. 卫星信号的覆盖面积主要取决于。

A.发射功率

B.卫星天线高度

C. 轨道高度

D.地面接收站的高度

2733. 在GPS卫星导航系统中,卫星的轨道高度为。

A.1948千米

B.1946千米

C.20200千米

D.19100千米

2734. 利用CPS卫星定位,在地平线7.°5以上,至少可观测到颗卫星。 A.3

B.4

C.5

D.6

2735. 利用GPS卫星定位,在地平线,至少可以见到4颗卫星。

A. 以上

B.5°

C.7.°5

D.15°

2736. 利用GPS卫星定位,在地平线,至少可观测到5颗卫星。

A.以上

B.5°

C.7.°5

D.15°

2737. 利用GPS卫星定位,在地平线以上,至少可见到。

A.3颗卫星

B.4颗卫星

C.5颗卫星

颗卫星11.D.

2738. GPS卫星导航系统发射信号的频率是。

A.1575.42兆赫,1227.60兆赫

B.399.968兆赫,149.988兆赫

C.10.2千赫,13.6千赫,11.33千赫

D.1602兆赫+N×0.5625兆赫,1246兆赫+N×0.4375兆赫

2739. GPS卫星导航系统发射两种频率的信号。

A.1602兆赫十0.5625兆赫,399.968兆赫

B.1246兆赫+0.43175兆赫,149.988兆赫

C.1227.60兆赫,1575.42兆赫

D.1948兆赫,1946兆赫

2740. 单频道GPS卫星导航中,接收的频率是。

A.1750兆赫~1850兆赫

B.2200兆赫~2300兆赫

C.1227.60兆赫

D.1575.42兆赫

2741. 双频道GPS卫星导航仪接收的频率是。

A.399.968兆赫、149.988兆赫

B.1602兆赫+Nx0.5625兆赫、1264兆赫+Nx0.4375兆赫

C.9970兆赫、3000兆赫

D.1575.42兆赫、1227.60兆赫

2742. 双频道GPS卫星导航仪所接收的频率的信号是用CA码和P码调制的频率的信号仅用P码调制了。

A.1227.60兆赫,1575.42兆赫

B.1575.42兆赫,1227.60兆赫

C.两个频率均用CA码及P码调制

D. 两个频率均用P码调制

2743. 双频道GPS卫星导航仪所接收的1575.42兆赫频率的信号是用调制的,1227.60兆赫频率的信号用调制的。

A.CA码和P码,P码

B. P码,CA码和P码

C.CA码,CA码

D. P码,P码

2744. 双频道GPS卫星导航仪所接收的频率的信号是由P码调制的频率的信号是由CA码和P码调制的。

A.1227.60兆赫,1575.42兆赫

B. 1575.42兆赫,1227.60兆赫

C.两个频率均用CA码和P码调制

D.两个频率均用P码调制

2745. 双频道GPS卫星导航仪所接收的1227.60兆赫频率的信号是用调制的,1575.42兆赫频率的信号是用调制的。

A.CA码和P码,P码

B.P码,CA码和P码

C.CA码,CA码

码P码,P. D.

2746. GPS卫星导航系统中,载波频率是用CA码和P码调制的,载波频率是用P 码调制的。

A.1227.60兆赫,1575.42兆赫

B.1575.42兆赫,1227.60兆赫

C.1570兆赫

D.1850兆赫

2747. GPS卫星导航系统中,载波频率是用P码调制的,载波频率是用CA码和P 码调制的。

A.1570兆赫

B.1850兆赫

C.1227.60兆赫,1575.42兆赫

D.1575.42兆赫,1227.60兆赫

2748. GPS卫星导航系统发射的L信号的频率由码调制。1A.P

B.Y和P

C.CA

D.CA和P

2749. GPS卫星导航仪采用。

A.码片搜索方式搜索GPS卫星信号

B.频率搜索方式搜索GPS卫星信号

C.A+B

D.A、B均不对

2750. GPS卫星导航系统各颗卫星发射的不同o

A.频率

B.伪码

C.时间

D.幅度

2751. GPS卫星信号波的调制信号是。

A.CA码

B.P码

C.P码和CA码

D.H码

2752. GPS卫星导航仪中所使用的CA码是一种。

A.快速、短周期的伪随机二进制序列码

B.慢速、短周期的伪随机二进制序列码

C.快速、长周期的伪随机二进制序列码

D.慢速、长周期的伪随机二进制序列码

2753. GPS卫星导航系统中所使用的CA码是的伪随机码。

A.快速、短周期

B.低速、短周期

C.低速、长周期

D.快速、长周期

2754 在GPS卫星导航系统中CA码的码率为。

兆赫1602. A.

B.1246兆赫

C.1.023兆赫

D. 10.23兆赫

2755. GPS卫星导航系统中所使用的P码是的伪随机码。

A.快速、短周期

B.低速、短周期

C.低速、长周期

D.快速、长周期

2756. GPS卫星每帧电文需时秒,完整的历书需时分钟。

A.20,2

B.15,4.5

C.30,8.5

D.30,12.5

2757. 从GPS卫星信号中可以提取。

A.多普勒频移信息

B.卫星轨道参数

C.对流层折射误差

D.A+B+C

2758. GPS卫星导航仪在定位过程中根据识别各颗GPS卫星。

A.伪码

B.频率

C.莫尔斯码呼号

D.时间顺序

2759. GPS卫星导航仪采用搜索电路。

A.码片

B.频率

C.A+B

D.A或B

2760. 通常,商船上使用码的GPS卫星导航仪定位与导航,其码率为。

A. P,10.23兆赫

B.P,1.023兆赫

C.CA,10.23兆赫

D.CA,1.023兆赫

2761. 单频道CA码GPS卫星导航仪所接收的载波频率是。

A.1227.60兆赫

B.1750~1850兆赫

C.2200~2300兆赫

D.1575.42兆赫

2762. 单通道GPS卫星导航仪系指。

A.选择GPS卫星L频率的信号1 B.选择GPS卫星CA码信号

C.GPS卫星导航仪用一个接收通道

D.选择GPS卫星P码信号

2763. 商船上用的最多的GPS卫星导航仪是 GPS卫星导航仪。

A.单通道、单频、CA码、时序型

B.双通道、单频、CA码、时序型

C.单通道、单频、CA码、多路复用型

D.多通道、双频、CA码和P码、连续型

2764. GPS卫星导航仪的载波使本机跟踪载波在频率和相位上和接收的载波对准,自动捕获和跟踪卫星。

A.码

B.信号

C.电文

D.载波

2765. 卫星测距定位指确定船位的方法是测量。

A.用户到卫星的距离

B.用户到卫星的距离差

C.用户到卫星的距离和

D.A+B+C

2766. GPS卫星导航仪测得的距离不是用户到卫星的真正距离,其中包括。

A.卫星时钟偏差

B.信号传播误差(电离层折射误差,对流层折射误差)

C.用户时钟偏差

D.A+B+C

2767. 海洋船利用GPS卫星导航仪进行二维定位时,至少选择颗GPS卫星。

A.3

B.4

C.6

D.11

2768. 在进行三维定位中,至少需颗GPS卫星。

A.2

B.3

C.4

D.5

2769. 在进行二维定位中,至少需颗GPS卫星,其中第3颗卫星用来估算出偏差。

A.4,用户时钟

B.3,用户时钟

C.4,卫星时钟

D.3,卫星时钟

2770. 在进行三维定位中,至少需颗CPS卫星,其中第4颗卫星用来估算出偏差。

A.4,用户时钟

B.5,用户时钟

C.4,卫星时钟

D.5,卫星时钟

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