1) low C/NO
低载噪比
1.
Therefore,kinds of methods for frequency refinement for C/A code can\' t work well for P code,especially under low C/NO.
GPS信号的P码码速率是C/A码的10倍,所以捕获时搜索相同时长的码相位需要做10倍点数的相关运算,相关运算通常用频域FFT实现,而硬件平台对FFT点数的限制使捕获得到的多普勒频率估计误差很大,因此C/A码的各种精频测量方法不能适用于低载噪比下的P码接收。
3) CNR
载噪比
1.
CNR Analysis of CDMA used in Fiber to the Railway;
CDMA在FTTR中应用的载噪比分析
2.
Effect of Initialization Conditions on the Reflectivity and CNR of Ge_2Sb_2Te_5 Phase-change Optical Disk;
初始化条件对Ge_2Sb_2Te_5相变光盘反射率和载噪比的影响
3.
The influence of the ionosphere,rain,multipath distortion,Doppler shift,the CNR of received signal and the design of the antenna used in the satellite are described.
阐述了大气层、降雨、多径失真、多普勒频移对星载AIS通信的影响,接收到的星载AIS信号的载噪比以及星上天线的设计等。
4) carrier-to-noise ratio
载噪比
1.
The noise figure of erbium-doped fiber amplifiers (EDFAs) can be derived from the degradation of carrier-to-noise ratio by the cable TV analyzer.
介绍了利用CATV分析仪,通过测量光放大器引起的系统载噪比劣化来推算光放大器噪声系数的方法,给出了噪声系数与载噪比劣化之间的关系。
2.
The computational formula and every influence factor of the carrier-to-noise ratio of CATV system are discussed, the concrete methods of lifting carrier-to-noise ratio are put forward.
探讨了CATV系统载噪比的计算公式及各种影响因素,并提出了提高载噪比的一些具体措施。
3.
Then the multiplex efficiency and the influence of intermodulation term on receivers\' carrier-to-noise ratio are thoroughly analyzed.
首先提出了易于卫星实现的3路信号Interplex复用结构,然后深入分析了复用效率和交调项对接收机的载噪比影响,最后以现代化GPS卫星Block IIR-M的L1信号复用为例,给出了定量分析结果。
5) C/N
载噪比
1.
Influence of Output Level to Modulator C/N;
输出电平对调制器载噪比的影响
2.
Primary Research on C/N Rate of Fibre-optical Network and Nonlinear Distortion;
光纤网络载噪比与非线性失真初探
3.
This paper describes three points:it s hard to measure C/N accurately,video signal from far-front- end makes the relation between C/N and S/N_(w) dis-corresponding,DTV demands C/N lower than analog TV for receiving a good quality picture.
论述了3个观点：准确测量载噪比是很困难的；远地前端的信号使C/N和S/N_((W))的关系失衡；数字电视比模拟电视具有更强的抗噪声性能。
6) carrier to noise ratio
载噪比
1.
Accuracy considerations in the G/T value measurement of the earth station using carrier to noise ratio direct method;
载噪比直接法测量地球站G/T值的精度研究
2.
The difficulties met in the automatic measurement of the carrier to noise ratio (CNR) for magneto-optical disks is discussed, and the spectrum signature of the signals produced by spectrum analyzer is analyzed.
分析了实现磁光盘载噪比CNR指标自动化测试的障碍和谱信号的特性，针对CNR测试中存在的特殊性，即测试精度依赖于对载波频率处的信号谱幅值和噪声谱幅值的测量误差，而与两者出现的时间无关。
3.
We introduce the concepts about carrier to noise ratio(CNR),CTB,XM and Eb/No in the field of CATV.
介绍了有线电视系统中的载噪比(CNR)、组合三次差拍比(CTB)、交调指数(XM)以及门限值(Eb/No)的含义,并讨论了载噪比与组合三次差拍比、交调指数以及门限值之间的关系。
补充资料：噪噪切切
1.犹言嘈嘈切切。指弦乐器上大弦和小弦发出的高低不同的声音。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条