星地测控链路中的功率控制策略研究

Research on power control strategy in TT&C link between satellite and ground

摘要:

对于卫星来说,能源是极其重要的资源,为有效节约星上能源、延长卫星寿命,研究了星地测控链路的功率控制策略。首先,分析了造成星地测控链路信号衰减的因素,在此基础上,建立了卫星下行链路信噪比计算模型,然后,在保证地面设备能够正确解调星上遥测数据的前提下,在星地测控链路中,提出了基于信噪比平衡准则的闭环功率控制策略,最后,利用构建的计算模型,仿真分析了所提功率控制策略对卫星功耗的影响和对雨衰的抑制作用。研究结果表明,所提的功率控制策略能大幅降低卫星功耗,且复杂度低,具有工程实践性,同时,对雨衰有较强的抑制作用,能有效提高设备跟踪时长,保证卫星下行信号接收。

Abstract:

For satellites, energy is an extremely important resource. In order to save the energy and prolong the life of satellite, the power control strategy of TT C link between satellite and ground is studied. First of all, the factors causing signal attenuation of TT C link between satellite and ground are analyzed. On this basis, the calculation model of signal-to-noise ratio of satellite downlink is established. Then, on the premise that the ground equipment can demodulate the satellite telemetry data correctly, a closed-loop power control strategy based on the signal-to-noise ratio balance criterion is proposed in TT C link between satellite and ground. Finally, the influence of the proposed power control strategy on satellite power consumption and rain attenuation is simulated and analyzed by using the calculation model. The results show that the proposed power control strategy can greatly reduce the power consumption of the satellite, and has low complexity and engineering practicality. At the same time, it has a strong inhibitory effect on rain attenuation and can effectively improve the tracking time of equipment to ensure the satellite downlink signal reception.