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到达时延
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  time of arrival
     Further more, the method of time of arrival (TOA) estimation is analyzed in the thesis, which is the key technique for mobile position location (PL) .
     论文还对进行移动台定位的关键技术——GSM上行信号到达时延估计(TOA)进行了深入的研究。
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  “到达时延”译为未确定词的双语例句
     An assumption is verified that the multi-path arrival time differences calculated by ray model is almost the same as that by normal mode model if higher frequencies for the source are used (e.g.,frequencies range between 600Hz and 1600Hz). hi other words,the calculation of the multi-path arrival time differences by ray model is reliable.
     该方法的研究结果验证了一个重要的假设:当信号频率较高时(例如600Hz~1600Hz),用声线模型计算多途到达时延差与简正波模型得到的结果基本一致,并且声线模型计算多途到达时延差具有较高的可信度。
短句来源
     Our system uses TDOA method to locate the mobile stations. The precision of the PL is depend upon the performance of the TOA algorithms .
     本系统采用到达时延差方法 (TDOA) 定位,定位的精度依赖于TOA算法的性能。
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     So in chapter 4 we proposed a novel synchronization algorithm for MIMO-OFDM system.
     因此本文第四章提出了一种新的MIMO-OFDM同步算法,该算法适用于各发射天线信号到达时延不同的情况,具有更广泛意义,可用于分布式MIMO系统。
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     Simulated results show that assuming the water depth is around 100 metersand the signal frequency employed is around 600-1300Hz, the use of ray arrival differencesfor sound speed profile inversion is feasible.
     针对100m左右浅海和600-1300Hz的信号频率,对两种模型仿真结果进行了比较。 结果表明,声线模型仿真得到的多途到达时延差结构与简正波模型仿真的结果基本一致。
短句来源
     A Time-Of-Arrival(TOA) estimation method for CDMA system with high resolution is proposed.
     提出了一种 CDMA系统的高精度的信号到达时延(TOA)的估计方法。
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  相似匹配句对
     ARRIVAL
     到达
短句来源
     Combined estimation of time delays and DOAs of multipath signals in CDMA system system
     CDMA系统中多径信号的时延到达角的联合估计
短句来源
     Joint Estimation of Time Delays, DOAs and Doppler Shifts of Reflections form Multiple Moving Targets
     动目标多径回波的时延到达角和多普勒频率联合估计
短句来源
     Delay Characteristics for the Asynchronous Tranfer Mode
     异步传送模式的时延特性
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     Stability of networked control systems with time-delay
     时延网络控制系统的稳定性
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  time of arrival
The problem of reconstructing the boundary of an arbitrarily shaped defect formed inside an elastic body from the measured time of arrival of the reflected ultrasonic wave in the echo method is considered.
      
The rms value of the pulse time of arrival (TOA) residuals for the pulsar at the barycenter of the Solar system is 1.8 μs (the relative variation is ≈10-14 over the observing period).
      
Caused by Non-Line-Of-Sight (NLOS) propagation effect, the non-symmetric contamination of measured Time Of Arrival (TOA) data leads to high inaccuracies of the conventional TOA based mobile location techniques.
      
The onset time is defined as the interval between the time of arrival in Japan and the request for treatment.
      
The first coma rating performed immediately at the time of arrival on scene had no significant prognostic value for prediction of neurological outcome (P = 0.204) and survival (P = 0.103).
      
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A NLOS (Non line of sight) high-resolution location algorithm is proposed based on the parameters TOA(Time of Arrival) 、DOA(Direction of Arrival) and DOD (Direction Of Departure) of multiple propagation paths, which can be measured simultaneously under the scenarios where single scattering is dominant in the double-array mobile communication system. From the knowledge of DOD, the single scattering path can be reconstructed and so NLOS location problem becomes solvable. Error analysis disclosed the performance...

A NLOS (Non line of sight) high-resolution location algorithm is proposed based on the parameters TOA(Time of Arrival) 、DOA(Direction of Arrival) and DOD (Direction Of Departure) of multiple propagation paths, which can be measured simultaneously under the scenarios where single scattering is dominant in the double-array mobile communication system. From the knowledge of DOD, the single scattering path can be reconstructed and so NLOS location problem becomes solvable. Error analysis disclosed the performance of this algorithm. Simulation shows its effectiveness when no line-of-sight propagation paths exist between the mobile station and the base station.

本文基于单次散射双向移动信道模型及信道参数联合估计,利用单基站测得的多条散射路径的到达时延、到达方向和离波方向进行定位,提出了一种非直达波条件下的TDD高精度移动定位算法 随后分析了其定位误差的分布特性。仿真结果验证了非直达波条件下该算法的有效性.

The effect of sediment density, speed, attenuation of compressional wave onsound speed profile inversion using time differences of acoustic ray arrivals in shallowwater is investigated, by normal mode modeling and ray modeling through computersimulation. Simulated results show that assuming the water depth is around 100 metersand the signal frequency employed is around 600-1300Hz, the use of ray arrival differencesfor sound speed profile inversion is feasible. It is satisfactory for combating sedimentparameters...

The effect of sediment density, speed, attenuation of compressional wave onsound speed profile inversion using time differences of acoustic ray arrivals in shallowwater is investigated, by normal mode modeling and ray modeling through computersimulation. Simulated results show that assuming the water depth is around 100 metersand the signal frequency employed is around 600-1300Hz, the use of ray arrival differencesfor sound speed profile inversion is feasible. It is satisfactory for combating sedimentparameters mismatching and greatly reduces the amount of copy vector calculation forwide-band signals.

本文以简正波模型和声线模型为基础,通过计算机仿真,研究了浅海多途到达时延差结构与沉积层密度、声速、传播损失系数等参数的关系。针对100m左右浅海和600-1300Hz的信号频率,对两种模型仿真结果进行了比较。结果表明,声线模型仿真得到的多途到达时延差结构与简正波模型仿真的结果基本一致。沉积层参数失配对基于声线模型的多途到达时差反演SSP的影响为:反演声速剖面的均方根误差的变化小于1.45m/s,平均误差的变化小于2.60m/s。这说明,在所使用的频段内,浅海沉积层参数对多途到达时差反演浅海声速剖面的影响不大,工程应用中可以忽略不计。

A Time-Of-Arrival(TOA) estimation method for CDMA system with high resolution is proposed. The integrate-dump circuits are used to sample the received signals while the sampling rate is not raised, then the Discrete-Fourier-Transform(DFT) is used to transform the discrete signals to frequency domain. Based upon the CDMA signal model, the multipath channel model and the discrete frequency spectrum of the known spreading codes, the integer part of TOA with multiples of a chip interval is estimated. Then least...

A Time-Of-Arrival(TOA) estimation method for CDMA system with high resolution is proposed. The integrate-dump circuits are used to sample the received signals while the sampling rate is not raised, then the Discrete-Fourier-Transform(DFT) is used to transform the discrete signals to frequency domain. Based upon the CDMA signal model, the multipath channel model and the discrete frequency spectrum of the known spreading codes, the integer part of TOA with multiples of a chip interval is estimated. Then least square method in discrete frequency domain is used to estimate the remainder fractional part of TOA. This method has the high resolution with low operation volume while the sampling rate is not high, so it is an effective and high precise TOA estimation method.

提出了一种 CDMA系统的高精度的信号到达时延(TOA)的估计方法。在不提高采样频率的情况下,使用积分-清除电路对接收信号进行采样,将离散信号用离散傅里叶变换(DFT)转换到频率域中,然后根据 CDMA信号模型和多径信道模型以及已知的扩频码的离散频谱,估计出信号相对于一个码片周期的整数部分 TOA;再在离散频率域中用最小二乘法估计出信号到达的小数部分 TOA,该方法即使在采样频率不高的情况下,也有很高的精度,而且运算量小,因此是一种有效的高精度 TOA估计方法。

 
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