二次调制

文中给出了数传电台内部的组成、信号流程和接口时序等总体架构，重点介绍了采用二次调制技术的MODEM模块和接收发射通道的详细实现方案。

It describes the collectivity framework such as composition , signal flow and interface sequence of the data transmission radio and makes emphases on how to realize the MODEM module and transmission / receiving channel that adopts the remodulation mode .

基于上行和下行信号之间的时序交错，我们提出了一种相位二次调制方法以消除瑞利后向散射噪声。

After reviewing the different techniques of RBS mitigation we proposed a novel idea of Phase remodulation based on Time Interleaving between downstream and upstream signals to mitigate RBS noise .

设计出了二次调制系统：采用连续可变斜率增量调制（CVSD）实现模拟话音信号与数字编码的转换，采用二进制相对相移键控（2DPSK）作为数字调制方式。

A twice modulation is designed : , CVSD was adopted to realize conversion between analog and digital voice signals , 2DPSK was used as the digital modulation mode .

文中详述了二次调制与解调的实现方法以及它在系统中的应用。

The paper expatiated on the second modulation and demodulation method applied in the system .

信号进行二次调制，引入两个参考信号分别对信号进行互相关处理，从而能抑制与参考信号同频率的干扰。

Modulating twice the signal to be tested and cross correlating it in turn with two reference signals , we are able to do so .