| 摘要: |
| 针对深空测控系统高精度测量对于信道附加相噪的要求，采用直接数字频率合成（DDS）正交调制方法设计频率综合器。通过巧妙的试验和外推方法，择优选取电压型鉴相器，在锁相环相噪模型的基础上，全面分析各部分相噪的贡献，综合设计环路带宽，有效控制附加相噪，实现低相噪频综器最理想的目标，即环路带内的相噪完全由参考决定，带外的相噪由压控振荡器（VCO）决定，并采用两源互比的方法完成1 Hz极低相位噪声的测试，测试结果为-73 dBc/Hz，与设计结果完全一致。该方法对于测控站极低相噪的设计具有一定参考价值。 |
| 关键词: 深空测控系统 高精度测量；1Hz相噪 直接数字频率合成器；正交调制 电压型鉴相器 |
| DOI： |
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| 基金项目: |
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| Low phase noise design technology of frequency synthesizer at 1 Hz for deep space TT&C system |
| DU Dan |
| () |
| Abstract: |
| For the additional phase noise requirements on channels in deep space TT&C system with high accuracy measurement,a frequency synthesizer is designed using direct digital synthesizing(DDS) quadrature modulation. A voltage-type phase discriminator is selected by smart test and extrapolation method. Based on phase noise model of phase locked loop,contributions from all parts of phase noise are analyzed. So the idealest performance of frequency synthesizer with low phase noise,i.e. loop in-band phase noise is depended on reference frequency,and out-band phase noise is determined by voltage-controlled oscillator(VCO),is implemented by loop bandwidth integrated design and efficient additional phase noise control. The 1 Hz low phase noise is tested through comparing two sources and it is -73 dBc/Hz,which is consistent with design result. This method is valuable to low phase noise design in deep space TT&C ground station. |
| Key words: deep space TT&C system high accuracy measurement 1 Hz phase noise direct digital synthesizer quadrature modulation voltage-type phase discriminator |
