射电天文研究组知识库

根据甚高频天线阵相位测量原理,提出一种利用相位检测芯片AD8302将接收机至传输馈线的两两阵元的定标信源信号的相位差转化为对应的直流电压,再用12 b量化精度单通道A/D采样,最后做误差分析及修正达到修正相位误差的方法。通过验证在低频(2 MHz等)、高频(300 MHz等)等测量条件下,系统给出的电缆相位误差的精度,如在300 MHz信号输入下,电缆之间距离误差达到了cm精度,可以广泛用于相关天线阵误差修正及电缆误差测量中。

According to the phase measuring principle of the very high frequency (VHF) antenna array, a method of using the phase detection chip AD8302 to convert the phase difference of the scaling source signal of the two array elements from receiver to transmission feeder line into the corresponding direct voltage. The single channel A/D sampling was realized with 12 bit quanti⁃zation accuracy. The error is analyzed and corrected to realize the phase error correction method. The accuracy of the cable phase error given by the system was verified in the measuring conditions of low frequency (2MHz) and high frequency (300 MHz). The error accuracy of the distance among cables can reach cm level when the input signal is 300 MHz. The system can be widely used for related antenna array error correction and cable error measurement.