Also it can effectively solve the main " four - threat " of single radar system . however , there ' s some problems must to be resolved , such as time synchronization , space and phase synchronization , signal processing , and clutter constricting , etc . this thesis concentrates on the time synchronization and phase synchronization of bistatic radar system 双基地雷达体制和系统结构上的特殊性决定了它在技术上具有不同于传统雷达的一些特点，所以双基地雷达系统的研制首先需要解决时间同步、频率和相位同步、空间同步、信号处理、杂波抑制等关键技术。
The statistical characteristic of extrinsic information from component decoders is discussed . based on it , ? it is explained that the related curves of input - output snr could be used to measure the performance and convergence of iterative decoding ; ? two types of turbo iterative stopping criteria are designed ; ? the methods to updating snr estimation in the process of iterative decoding is provided ; ? a way to implement synchronization of carrier phase by serial concatenation scheme is devised 在分析迭代译码输出外部信息的统计特性基础上?考察了迭代译码器输入输出snr关系曲线，并说明它可以作为衡量迭代译码性能和收敛性的工具； ?设计了两类新的turbo迭代译码停止准则； ?提出了在迭代译码过程中更新snr估计的方法；国防科学技术大学研究生院学位论文设计了利用外部信息统计量实现载波相位同步的串行级联方案。
This paper put forward the realization method of a kind of multi - function general use inverter system which added other functions based on the independent sine wave inverter , it not only can be used as independent inverter power supply but can be used as an in - support mode ups which realize synchronous with the phase of power grid voltage and realize to switch with power grid mutually , it also can realize three phase ac output by the combination of three synchronous inverters , experiment proved it in this way has a stronger ability of resisting three phase unbalance load 本文提出了一种基于独立正弦波逆变器的功能之上复合其他功能而成的多功能通用逆变电源系统的实现方法，此系统不仅可以作为独立逆变电源使用，还可以与电网电压的相位同步，作为后备式正弦波ups使用，在逆变电源和电网的相互切换时能做到对负载无影响，同时还可以由三台逆变器进行组合自同步实现三相对称交流输出，实验证明这种方式具有较强的抗三相不平衡负载的能力。
Based on the simulation results , the key techniques for the design of turbo codes , including the choice of component codes , the design of interleaver , trellis termination schemes and puncturing methods , are discussed deeply . by measuring the statistical characteristic of extrinsic information from component decoders , new iterative stopping criteria and snr estimation updator are devised . also , it is used to implement synchronization of carrier phase 本文首先对turbo码的基本编译码原理进行分析，在仿真结果的基础上对turbo码设计中的分量码选择、交织器设计、编码器状态归零方案以及删余方式等部分关键问题进行探讨；通过考察外部信息的统计特性，设计了新的迭代停止准则和snr估计更新器，并利用外部信息实现串联载波相位同步；最后对turbo均衡进行简要分析。
