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针对卫星导航现代化条件下的导航信号复用问题,在对正交叉积正弦副载波调制信号和正交叉积方波副载波调制信号的调制方法进行详细分析的基础上,提出了一种新的基于正弦波采样的正交叉积副载波调制方法。应用周期信号的傅立叶级数展开方法,给出了以上三种调制信号的调制表达式和功率效率,并根据这些结果比较了三种副载波调制信号的性能。分析和仿真结果表明:正交叉积正弦副载波调制和正交叉积方波副载波调制都是正交叉积抽样正弦副载波调制的特例,而当抽样指数大于16时,正交叉积抽样正弦副载波调制信号在性能上与正交叉积正弦副载波调制信号接近,但实现方式却比较简单。
Aiming at the problem of navigation signal multiplexing under the condition of satellite navigation modernization, based on the detailed analysis of the modulation method of the orthogonal cross product sine subcarrier modulation signal and the orthogonal cross product square subcarrier modulation signal, a new sinusoidal Wave sampling orthogonal cross product subcarrier modulation method. By using the Fourier series expansion method of periodic signals, the modulation expressions and power efficiencies of the above three modulation signals are given, and the performances of the three subcarrier modulation signals are compared according to these results. The results of the analysis and simulation show that the orthogonal cross-product sinusoidal subcarrier modulation and the orthogonal cross-product square subcarrier modulation are all special cases of the orthogonal cross product sinusoidal subcarrier modulation. When the sample index is more than 16, the cross-product sinusoidal subcarrier modulated signal In performance and the positive cross-product of the sinusoidal sub-carrier modulation signal close, but the realization is relatively simple.