通用化扩频测控信道模拟器高精度固有延时在线校准方法

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通用化扩频测控信道模拟器高精度固有延时在线校准方法

本发明提供一种通用化扩频测控信道模拟器高精度固有延时在线校准方法，具体过程为：步骤1利用本振信号S upL (t)对模拟输入信号和实际模拟输出信号作正交解调，得到复基带输入信号S upB (t)和复基带模拟信号S uprB (t)；步骤2在数字域中，利用基于动态索引及拉格朗日内插的模拟运动规律对消技术消除t时刻星地时间延时τ(t)，得到数字信号S upBN1 (nT s )和S uprBN1 (nT s )；步骤3采用时延估计方法对信号S uprBN1 (nT s )和S upBN1 (nT s )间的时延进行估计，得到当前校准时间内的固有延时估计值 步骤4重复步骤2-3，得到N a 个固有延时估计值的平均值 步骤5：利用 对模拟运动规律τ(t)进行修正，利用τ m (t)取代模拟输出信号S upr1 (t)中的τ(t)，得到修正后的模拟输出信号S upr1 (t)；步骤6重复步骤2-5，实时地消除固有延时变化对高精度模拟的影响。

High-precision inherent delay online calibration method for universal spread spectrum measurement and control channel simulator

The invention provides a high-precision inherent delay online calibration method for a universal spread spectrum measurement and control channel simulator. The high-precision inherent delay online calibration method comprises the specific steps that 1, a simulation input signal and an actual analog output signal are orthogonally modulated by an intrinsic signal S_upL(t) to obtain a complex baseband input signal S_upB(t) and a complex baseband analog signal S_uprB(t); 2, in the digital domain, the satellite-to-ground time delay tau(t) at the t moment is eliminated through a dynamic index and Lagrangian interpolation based simulated motion law cancellation technique to obtain digital signals SupBN1(nTs) and S_uprBN1(nTs); 3, a time delay between the signals S_uprBN1(nTs) and S_upBN1(nTs) is estimated through a time delay estimation method to obtain inherent delay estimation values in the current calibration time; 4, the step 2 and the step 3 are carried out repeatedly to obtain the average value of the Na inherent delay estimation values; 5, the simulated motion law tau(t) is modified based on the average value, tau(t) in an analog output signal S_upr1(t) is replaced through tau_m(t), and then the modified analog output signal S_upr1(t) is obtained; and 6, the steps 2-5 are carried out repeatedly to eliminate the influence of inherent delay changes on high-precision simulation in real time.