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针对现有飞行器测控系统遥测对接试验周期长、效率低的不足,提出一种异地遥测对接方法。通过构建异地遥测对接系统结构,得到异地遥测对接信号链路模型。基于系统时钟抖动的频率、相位和采样时间表达形式,对异地遥测对接链路中的信号进行了具体推导。在此基础上,从频率和相位2个方面,定量分析了系统时钟抖动对异地遥测对接信号相参性的影响。分析结果表明:对于Ka频段信号,当应答机端异地遥测对接系统的时钟短期频率稳定度优于1×10-11时,异地遥测对接系统引入的频率抖动Δf≤0.6Hz,相位抖动Δφ≤0.075rad,可认为异地遥测对接信号的相参性不受影响,异地遥测对接可行。
Aiming at the problem of long test cycle and low efficiency of the telemetry and docking test and measurement system of the existing aircraft, a remote telemetry docking method is proposed. By constructing the structure of the remote telemetry docking system, a remote telemetry docking signal link model is obtained. Based on the frequency, phase and sampling time representation of the system clock jitter, the signals in the remote-site telemetry docking link are specifically deduced. Based on this, the influences of the system clock jitter on the phase-to-phase telemetry docking signal are quantitatively analyzed from two aspects of frequency and phase. The analysis results show that for the Ka-band signal, when the short-term frequency stability of the transponder far-field telemetry docking system is better than 1 × 10-11, the frequency jitter Δf≤0.6Hz and the phase jitter Δφ≤0.075 rad, it can be considered that the coherence of remote remote sensing and docking signals is not affected, remote remote docking is feasible.