基于高精度延时外放技术的通用化测控信道模拟方法

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基于高精度延时外放技术的通用化测控信道模拟方法

本发明提供一种基于高精度延时外放技术的通用化测控信道模拟方法，其基本实施过程如下：利用本振信号对输入信号S up (t)进行正交下变频，得到复基带输入信号S upB(t)；对星地时间延时τ(t)进行离散化处理；以T s 为采样间隔对复基带输入信号S upB (t)进行采样，得到复基带输入信号的采样序列，然后对其进行初始整周期α in 的延时得到S upB1 (n)；从S upB1 (n)中选择相应数据至小数延时滤波器进行滤波；将采样序列以T s 为间隔进行D/A转换，并经重构滤波后得到复基带信号的延时重构信号S uprB (t)；依据星地时间延时τ(t)，精确产生信号S upD (t)，并将其正交调制到 上，以得到固定本振信号的延时重构信号S upL1(t)；将复基带信号的延时重构信号S uprB (t)和固定本振信号的延时重构信号S upL1 (t)按下式合成，以得到最终的模拟输出信号S upr (t)。

Universal measurement and control channel simulation method based on high-precision delay external release technology

The invention provides a universal measurement and control channel simulation method based on a high-precision delay external release technology. The basic implementation process of the universal measurement and control channel simulation method is as follows: orthogonally down-converting an input signal S_up(t) through an intrinsic signal to obtain a complex baseband input signal S_upB(t); discretizing a satellite-to-ground time delay tau(t); sampling the complex baseband input signal S_upB(t) with T_s as the sampling interval, and obtaining a sampling sequence of the complex baseband input signal, and then carrying out the delay of the initial period alpha_in on the sampling sequence to obtain S_upB1(n); selecting corresponding data from S_upB1(n) to a fractional delay filter for filtering; carrying out D/A conversion on the sampling sequence at intervals of T_s, and carrying out reconstruction filtering to obtain a delayed reconstructed signal S_uprB(t) of the complex baseband signal; accurately generating a signal S_upD(t) according to the satellite-to-ground time delay tau(t) and orthogonally modulating the signal S_upD(t) to S*_upL(t) to obtain a delay reconstructed signal S_upL1(t) of the fixed intrinsic signal; and synthesizing the delayed reconstructed signal S_uprB(t) of the complex baseband signal and the delayed reconstructed signal S_upL1(t) of the fixed intrinsic signal according to the following formula described in the specification to obtain a final analog output signal Supr (t).