基于VLBI的上行组阵标校技术研究

天线组阵能否完全替代大口径天线有一个关键性难题,就是天线阵是否支持上行链路组阵。深空航天器无法将不同地面天线的上行信号对齐,所以上行链路信号的调整必须在地面完成。针对上行组阵发射机相位调整问题,提出一种基于VLBI(Very Long Baseline Interferometry,甚长基线干涉测量)技术的接收模式天线上行组阵标校方案,并对标校精度进行了简要分析。将上行链路时延分解为几何时延和发射系统时延,建立了几何时延模型,通过标定接收时延和发射时延,便可以得到天线阵元间的相位标校值。理论分析结果表明,该方案具有一定的可行性,对上行组阵相位标校的研究具有一定的借鉴意义。

Calibration of Uplink Arrays Using VLBI

Whether an antenna array supports uplink array is a key issue for the total replacement of a large aperture antenna with antenna array.Adjustments of uplink signals have to be done on ground as it is not possible for deep space spacecraft to align uplink signals of different ground antennas.A scheme of receive mode uplink array calibration based on VLBI is proposed to perform phase adjustments of uplink array transmitter, and the calibration accuracy is analyzed briefly.The uplink delay is decomposed into geometric delay and transmit system delay,and a geometric delay model is established.The phase calibration value between antenna array elements can be got through calibration of receive delay and transmit delay.The theoretical analysis results show that the scheme has certain feasibility and significance to study of uplink array calibration.