调制解调器的已调信号通过VHF通信系统进行二次调制，通过VHF通信系统的信道实现数据通信。
Modem signals will be transferred through the VHF communications system has a second modulation, through VHF communication system access to data communications.
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.
设计出了二次调制系统：采用连续可变斜率增量调制（CV SD）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.
本文将非线性调频技术引入引信探测体制中，利用线性调频波作为调制信号对射频信号进行二次调频。
In this paper, we present a new frequency modulation function on the basis of features of traditional non-linear frequency modulation signal.
本文将非线性调频技术引入引信探测体制中，利用线性调频波作为调制信号对射频信号进行二次调频。
In this paper, we present a new frequency modulation function on the basis of features of traditional non-linear frequency modulation signal.
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