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radio signals
相关语句
  无线电信号
     Automatic Recognition of Short Range Radio Signals
     近程无线电信号的自动识别
短句来源
     Ultra Wide-band (UWB) wireless communication technology transmits data through sending pulse radio signals directly.
     超宽带(UWB)无线通信通过直接发送脉冲无线电信号传送数据。
短句来源
     The scanning could be scheduled far in ad-vance of handover,however there's a risk of 802.11 stations(STA) to use out-of-date information by the time ofhandover due to unpredictable rapid change in radio signals.
     这个扫描的定时超前于移交,然而由于无线电信号不可预测的快速变化,802.11 station可能利用移交的时间使用过时的信息。
短句来源
     2. Analyses of the GPS signal characteristicThe analyses are conducted on the ambiguity characteristics of typical commercial radio signals including broadcast signals, television signals, mobile communication signals and satellite signals.
     分析了用于无源雷达照射源的典型商业无线电信号(广播、电视、移动通信和卫星)的模糊函数特性,在比较它们的距离和多普勒分辨力的基础上,进一步分析了GPS信号双基雷达模糊函数,同时也从双基雷达能量、距离、多普勒与分辨单元面积等方面的关系揭示了GPS信号性能优势,结果表明GPS信号可作为无源雷达照射源。
短句来源
     The automatic recognition and parameter estimation techniques of communication signals can be utilized in the authentication and spectrum management for radio signals.
     通信信号的自动识别与参数估计技术可用于有关职能部门对无线电信号进行认证、实施频谱监管。
短句来源
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  “radio signals”译为未确定词的双语例句
     Recognition of Proximity Radio Signals Based on the Discrete Wavelet Transformation
     基于离散小波变换的近程信号自动识别
短句来源
     Based on the coherent reception theory of radio signals and the theory of digital signal processing, the effects of carrier frequency offset, sampling clock offset, and symbol timing offset on OFDM signals are exploited.
     讨论了多载波传输系统的接收同步理论,以无线信号的相干接收和数字信号处理理论为基础,就载波频偏、采样钟偏差和符号定时偏差对OFDM信号的影响进行了分析,对基于保护间隔的符号定时与载波频偏估计算法和多种现有频偏、采样钟与符号定时偏差的频域估计算法进行了研究。
短句来源
     Based on receiving and measurement of radio time signals of short waves at Shanghai Observatory during a long period (1976-1985), this paper described the measurement of propagation time of several radio signals, BPM, JJY, WWVH, RID and RWM.
     本文根据上海天文台接收短波无线电时号的长期测量结果(1976-1985)讨论几个短波无线电时号BPM、JJY、WWVH、RID和RWM至上海的传输时间测量问题。
短句来源
     Modulation Recognition of Software Radio Signals Based on Neural Networks
     软件无线电中调制信号的神经网络识别方法
短句来源
     As we know that the refraction of the neutral atmosphere on radio signals is one of the important error sources in GPS surveying.
     中性大气对GPS信号的折射影响是GPS测量的重要误差源之一。
短句来源
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  相似匹配句对
     THE JOINT CORRECTIONS OF RADIO TIME SIGNALS
     我国的综合时号改正数
短句来源
     Automatic Recognition of Short Range Radio Signals
     近程无线电信号的自动识别
短句来源
     Information and Signals
     信息与信号
短句来源
     of broadcasting signals.
     主要实现了对异地广播信号的实时监测,录音,数据存储,异常告警等功能。
短句来源
     Software Radio
     软件无线电
短句来源
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  radio signals
With a fast paper speed (typically 1 cm/sec) and the WWVB radio signals superposed on the seismic trace, absolute timing accuracy of up to 10 msec is achieved.
      
The article first describes in chronological order the observations on the propagation of radio waves during the solar eclipses, and the development of the conflicting results on the similar transmissions of radio signals.
      
The narrowband measurements were devised to measure attenuation of radio signals and the wideband techniques to measure multipath impulse responses and their associated root mean square delay spread.
      
Directional antennas can adaptively select radio signals of interest in specific directions, while filtering out unwanted interference from other directions.
      
A number of effects that influence achievable synchronization accuracies, relating to the operating conditions of broadcasting radio stations as well as the transmission of radio signals, are discussed.
      
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Experiments were made to study the effects of an artificial plasma sheath on the performance of a meter wave band antenna surrounded by the plasma and on the decay of the wave passing through that plasma. The plasma density in this experiment is about 10810-1010/cm3 and the radio signal fed in antenna has a frequency range of 80-150 MHz which is much lower than the plasma frequency. The results showed that such a plasma layer made the signal field strength some 20 meters away a decrease of more than...

Experiments were made to study the effects of an artificial plasma sheath on the performance of a meter wave band antenna surrounded by the plasma and on the decay of the wave passing through that plasma. The plasma density in this experiment is about 10810-1010/cm3 and the radio signal fed in antenna has a frequency range of 80-150 MHz which is much lower than the plasma frequency. The results showed that such a plasma layer made the signal field strength some 20 meters away a decrease of more than 10 db and that input impedance of the antenna changed a lot. These results were also discussed and compared with theory.

对660—760mm长的米波半波天线在人工等离子体包围下的辐射性能和特性阻抗受到的影响以及电波穿过等离子体后场强的衰减进行了实验研究。等离子体浓度为10~8—10~(10)/cm~3。天线工作频率80—150MHz,远低于等离子体频率。结果表明这样的薄层等离子体(20cm厚)鞘套使电波场强衰减达十几分贝,输入阻抗明显改变。文中对这些实验结果进行了初步的分析和讨论。

The radio signals came from the sky are received by the antenna and the receiver. The radio signals are transformed into the optical informations by the acoustic-optical deflector. Then we could sample, store and proccess data with photodiod array and microcomputer, for example, we could make the real spetrogram analyses. With the system, we could subtracte the background, therefore we can raise the signal, noise rate.

光电二极管阵与计算机连用进行图象处理。在卫星遥感图象传播和光学信息处理方面已得到广泛的应用。在射电天文领域里,接收到的宇宙无线电信息,可以通过声光调制变为光学量,然后用光电二极管阵和微计算机进行存储和数据处理。比如可进行实时频谱分析。并且,通过计算机处理后,可大大提高系统的性能。比如可以减去光路系统中背景杂散光的影响,也可以从较强的背景噪声和有规律的干扰中提取出更微弱的信号。

In this paper a method for measuring network frequencycharacteristic with TP801A single-board computer adding suitable interface is introduced. It can act as an exainple applying microcomputer to the electronic measurement. The test results show that frequency range measured with the device is 15Hz-4kHz. The phase range is ±5°-175°. The errors of measured values are as follows. The phase is equal to or less than 1.4? The amplitude is equal to or less than 4%. The method is simple, convenient and accurate. The...

In this paper a method for measuring network frequencycharacteristic with TP801A single-board computer adding suitable interface is introduced. It can act as an exainple applying microcomputer to the electronic measurement. The test results show that frequency range measured with the device is 15Hz-4kHz. The phase range is ±5°-175°. The errors of measured values are as follows. The phase is equal to or less than 1.4? The amplitude is equal to or less than 4%. The method is simple, convenient and accurate. The system can be used to measure the control signals in industry and low-frequency radio signals. Also, it can be used in the teaching of the laboratory experiment course.

本文介绍一种用 TP801A 单板机加适当接口,测试网络频率特性的方法,可作为微型计算机在电子测量领域中应用的一个实例。其测试频率为15Hz~4kHz,相位为±(5°~175°)。测量误差值:相位≤1.4°,幅值≤4%。此测试方法简便、直观、准确,可代替复杂昂贵的测试仪器。本系统可用在工业控制信号及低频无线电信号的测量中,也可用在基础课的实验教学中。若采用更高速的uc及数据处理功能强的计算机组成测试系统,测试的频率将会更高,功能也将大大增强。

 
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