摘要
I/Q解调器的误差决定了PAD的相位测量精度。本文在I/Q解调器以往的两项误差模型基础上引入三项误差模型,并给出了相应的误差校准方法。实验结果表明,这种校准方法是合理有效的。在BEFC Ⅱ工作频率2856MHz上,经校准的I/Q解调器的误差范围减小为-1.8°-0.5°,且360°范围内任意相位值的测量误差均得到了抑制。
The accuracy of PAD depends on the errors of I/Q demodulator. On the basis of conventional 2- item error model of I/Q demodulator, this paper constructs a 3-item error model and presents a corresponding calibration approach. The measuring results show that its error range has been reduced to -1. 8°-0.5°, and its residual error has also been reduced when measuring from an arbitrary phase value of 0°-360°.
出处
《核电子学与探测技术》
CAS
CSCD
北大核心
2008年第4期792-795,共4页
Nuclear Electronics & Detection Technology