基于双中频并行采样的数字I/Q信号获取

针对大时宽带宽积信号模拟正交解调时难以工程实现的问题，提出了基于双中频并行采样的正交解调方法和结构。该方法和结构是模拟正交解调的推广，通过对包含相同回波信息的两路中频信号在特定时刻采样，以及对两采样序列作简单的符号转换来获取数字I/Q信号，解决了大时宽带宽积信号模拟正交解调时性能较差以及需要复杂的数字校正过程等问题，且易于工程实现与实时处理。误差分析表明，该方法和结构在大时宽带宽积信号时获取的数字I/Q信号性能优良。 

Generate the Digital I/Q Components Based on the Parallel Sampling of the Double-IF

Aiming at the poor I/Q mismatch of the analog quadrature demodulation topology under the condition of the large time-bandwidth product signals,a new method of generating the high precision digital I/Q components based on the parallel sampling of the Double-IF which by the given sampling of the different IF of the echo signal and the subsequent sign changer is proposed.The Double -IF quadrature demodulation topologies which fixed phase imbalance can be autocorrected are designed.The topologies are easy to be...