摘要: |
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。 |
关键词: 深空测控 甚长基线干涉测量 全频谱基带转换 均匀信道化 正交混频 |
DOI: |
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基金项目: |
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Research on Deep Space TT&C VLBI Full Spectrum Digital Baseband Conversion Methods |
JIANG Kun,WANG Yuan-qin,LIANG Sheng |
(Academy of Equipment, Beijing 101416,China) |
Abstract: |
A new VLBI baseband conversion method is proposed for special require
ments of full spectrum processing in deep space TT&C. The method combines the ef
ficient uniform channelization with the orthogonal mixing, which can realize the
processing of certain bandwidth without dead zone and distortion. By clever cha
nnelization and change of lowpass prototype filter shape factor, the processin
g
of input signal analysing bandwidth without dead zone and distortion in certain
bandwidth is realized. Using the flexibility of orthogonal mixing,wideband a
n
d narrowband singlesideband output schemes are designed. The center frequenc
y
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 c
onversion of analysing bandwidth. |
Key words: deep space TT&C;VLBI full spectrum baseband conversion uniform channelization orthogonal mixing |