深空测控VLBI全频谱数字基带转换方法研究

针对深空测控VLBI基带转换全频谱处理的特殊要求，提出了一种固定带宽无失真接收的无盲区高效均匀信道化和正交混频相结合的基带转换方法。通过巧妙的信道划分和低通原型滤波器矩形系数的改变，实现了可分析频带内无盲区、固定带宽无失真接收处理，利用正交混频的灵活性，设计了宽/窄带单边带输出方案，实现输出信号中心频率任意可变、带宽可选。仿真结果表明，新方法计算效率高、资源消耗少，能够实现可分析频带内全频谱基带转换功能。

Research on Deep Space TT&C VLBI Full Spectrum Digital Baseband Conversion Methods

A new VLBI baseband conversion method is proposed for special requirements of full spectrum processing in deep space TT&C. The method combines the efficient uniform channelization with the orthogonal mixing, which can realize the processing of certain bandwidth without dead zone and distortion. By clever channelization and change of low pass prototype filter shape factor, the processing of input signal analysing bandwidth without dead zone and distortion in certain bandwidth is realized. Using the flexibility of orthogonal mixing,wide band and narrow band single sideband output schemes are designed. The center frequency of output signal can be changed arbitrarily and the bandwidth can be selected by different filter cascades. Numerical simulations show that the proposed method is efficient,has less resource consumption and can realize full spectrum baseband conversion of analysing bandwidth.