Description: 在软件接收机的基础上,利用鉴频器辅助鉴相器的输出,引入一个模糊逻辑控制器,使得环路能够智能跟踪信号的动态变化.实验结果证明所提出的设计方法与传统环路相比可大幅度缩短跟踪时间,减小环路滤波器带宽,并能消除周跳.-In the software receiver, based on the use of auxiliary frequency discriminator phase detector output, the introduction of a fuzzy logic controller, the loop can be intelligent tracking signal dynamics. The experimental results demonstrate that the proposed design method with the traditional loop phase than we might have to significantly reduce the tracking time, reduce the loop filter bandwidth, and can eliminate the cycle slips. Platform: |
Size: 344064 |
Author:何宁 |
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Description: The multipath performance of a given signal/receiver combination depends on various signal and receiver parameters like signal type/modulation scheme pre correlation bandwidth and filter characteristics, chipping rate of code ,relative power levels of multipath signals ,chip spacing between correlators and type of discriminator used for tracking.
For the following analyses the influence of code multipath will be illustrated by means of multipath error envelopes.
In these diagrams, the resulting ranging errors are plotted as a function of geometric path delay .the computation of
multipath errors envelops is based on the assumption, that the direct signal component is always available and that only one
multipath signal is present-The multipath performance of a given signal/receiver combination depends on various signal and receiver parameters like signal type/modulation scheme pre correlation bandwidth and filter characteristics, chipping rate of code ,relative power levels of multipath signals ,chip spacing between correlators and type of discriminator used for tracking.
For the following analyses the influence of code multipath will be illustrated by means of multipath error envelopes.
In these diagrams, the resulting ranging errors are plotted as a function of geometric path delay .the computation of
multipath errors envelops is based on the assumption, that the direct signal component is always available and that only one
multipath signal is present Platform: |
Size: 5120 |
Author:Rafal |
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Description: pi/4-qdpsk调制解调程序，能有效地进行差分解调和鉴频器解调，在一些不易提取载波的场合很有用。因此，利用仿真来研究系统是必要的。-pi/4-qdpsk modulation and demodulation process, can effectively reconcile the difference solution frequency discriminator demodulation, carrier extraction in a number of difficult situations is useful. Therefore, the use of simulation to study the system is necessary. Platform: |
Size: 1024 |
Author:红茶坊 |
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