CAJ | 학술논문

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.
침대위성도항현대화조건하적도항신호복용문제,재대정교차적정현부재파조제신호화정교차적방파부재파조제신호적조제방법진행상세분석적기출상,제출료일충신적기우정현파채양적정교차적부재파조제방법.응용주기신호적부립협급수전개방법,급출료이상삼충조제신호적조제표체식화공솔효솔,병근거저사결과비교료삼충부재파조제신호적성능.분석화방진결과표명:정교차적정현부재파조제화정교차적방파부재파조제도시정교차적추양정현부재파조제적특례,이당추양지수대우16시,정교차적추양정현부재파조제신호재성능상여정교차적정현부재파조제신호접근,단실현방식각비교간단.
Aimed at navigation signal multiplexing in the condition of satellite navigation system modernization,signal multiplexing methods based on sine wave and square wave quadrature product subearrier modulation(QPSM)are analyzed in detail.A new subearrier modulation method based on sample sine wave is proposed.Formulae nd power efficiencies of these three subcarrier modulation signals are givan using Fourier series expansion.The performances of these three methods are compared based on the analysis conclusions.The results show that quadrature Product sine subcarrier modulation and quadrature product square wave subearrier modulation can be treated as the special examples of quadrature product sample sine wave subcarrier modulation,and when sample index exceeds 16,the power efficiencies of the two nearly equivalent,but quadrature product sample sine wave subcarrier modulation signal could be implemented easily.