基于分布式地面站天线的空间功率合成

doi:10.7527/S1000-6893.2016.0001

Abstract

Abstract:

Signal uploaded by Earth station of global navigation satellite system (GNSS) is weak when reaching satellite, and it is vulnerable to interference, then the antennas have the demand of multi-target uploading in peacetime and single target enhancing in jamming-time. A kind of spatial power combining is presented to enhance the upload signal using distributed antenna in Earth station since earth stations in GNSS are time synchronized with high precision. The upload signals at receiver on satellite are phase course synchronized with phase pre-compensation. Then the impact of phase error and power error on power combining efficiency is analyzed, so we obtain the constraint relationship between initial phase measure precision and relative positioning precision under certain efficiency. Also the quality and ant-jamming of synthesized signal in the receiver are analyzed. The theoretical and simulation results show that, when initial phase measure precision and relative positioning precision are both less than 0.2, the combining efficiency of 4 elements is more than 75% among the scan elevation range of over 10° and can be improved when the higher initial phase measure precision and relative positioning precision are available. But the transmiting power error can hardly affect the combining efficiency when efficiency larger than 75% is demanded. Distributed beam scanning antenna can enhance the power of the upload signal, so it can provide a solution to power enhancement suffered by self-propelled and miniaturized Earth station by arraying distributed antennas to achieve flexible combining and configurations of beam and power.

Key words: satellite navigation, distributed antennas, beam scan, phase pre-compensation, combining efficiency

CLC Number:

ZHANG Ke, LIU Zengjun, NIE Junwei, ZHU Xiangwei, SUN Guangfu. Spatial power combining based on distributed antennas in Earth station[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2016, 37(6): 1912-1920.

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Spatial power combining based on distributed antennas in Earth station

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