英语翻译2 Phase error analysisA Septentrio PolaRxS was used to a

英语翻译
2 Phase error analysis
A Septentrio PolaRxS was used to analyse PLL performance under the effects of an ionospheric scintillation event.The ionospheric scintillation event was characterised by means of experimental data collected at a typical low latitude station during disturbed conditions.The experimental data consisted of raw intensity and phase for all the PRNs in view at a given instant.Scintillation indices were calculated in postprocessing and used to identify the most suitable
event for the evaluation of the PLL performance.The most suitable event was characterised by an initial 20 minutes of very low scintillation activity (S4 ≤ 0.1),20 minutes of moderate to strong scintillation (0.6 ≤ S4 ≤ 1) and 20 minutes of low scintillation activity (S4 ≤ 0.2),as shown in Figure 1.
The signal perturbations (in both intensity and phase) corresponding to such a scintillation scenario were then extracted from the experimental data by essentially separating the high frequencies of interest from the low frequencies fluctuations in the received signal.Then,the signal perturbations were suitably ingested into a Spirent GSS8000 signal simulator,which simulated the nominal signals of the PRNs of interest together with the perturbations in input.The effects on a commercial receiver were recorded by using the Septentrio PolaRxS receiver,which is able to record post-correlated I/Q samples at 50 Hz sampling rate.Scintillation indices and phase error statistics were then calculated by using this type of raw data.
An example of the results is shown in Figure 2.The upper plot shows the estimate of the received signal intensity (at 50 Hz sampling rate) throughout the simulated scintillation event.The second plot (from the top) shows the phase error (at 50 Hz sampling rate) during the simulated event.The third plot shows the standard deviation of the phase error (averaged over one minute intervals) and is intended to provide a measure of the phase jitter in real time during the simulated fading event.The bottom plot shows the lock time on L1 throughout the event.The example in Figure 2 refers to a PLL configuration in which the bandwidth was 15Hz,the threshold in the lowest deviation from the nominal C/N0 was −20dB − Hz and the pre-detection integration time was 10ms.On the other hand the example shown in Figure 3 refers to a PLL configuration in which the only difference from the previous configuration was the bandwidth,this time set to a value of 10Hz.

两相误差分析
一个Septentrio PolaRxS被用来分析锁相环性能的影响下一个电离层闪烁的事件.电离层闪烁的事件是怀著收集试验数据的方法在一个典型的低纬度站在扰动条件.实验数据包括原料的强度和相位在PRNs针对给定的瞬间.闪烁指数计算和后置处理是用来识别最合适
事件进行锁相环的性能.最适合的事件有相当一个初始20分钟很低的闪烁活动(S4≤0.1),20分钟的中度至强闪烁(S4≤0.6≤1)和20分钟的低闪烁活动(S4≤0.2),如图1所示.
信号扰动(在两个强度和相位)对应于这样一个闪烁场景然后提取通过基础实验数据分离感兴趣的高频率低频率波动从接收信号.然后,信号扰动是成为一个Spirent适当摄入GSS8000信号模拟器,名义进行了模拟信号的感兴趣的PRNs一起在输入扰动.对一个商业接收机采用Septentrio记录PolaRxS接收器,就是能记录post-correlated I / Q样品50赫兹采样率.闪烁相位误差统计指标,然后采用计算这种类型的原始数据.
其结果的一个例子如图2所示.上面的图谋表明估计接收信号强度(50赫兹采样率在整个模拟闪烁的事件.第二个情节(从头顶)显示的相位误差(50赫兹采样率)在模拟的事件.第三个图谋表明的标准偏差的相位误差(平均超过一分钟间隔),旨在提供一个衡量相位抖动实时模拟衰落在事件.底部图谋表明锁定时间在L1整个事件.在图2例指的是一个锁相环配置带宽是15赫兹门槛,最低背离名义C /渺茫−−20分贝是赫及pre-detection整合时间是10女士.另一方面,例子如图3指的是一个锁相环配置唯一的区别,从以往的配置文件被带宽,这次值调整到10赫兹.