【摘要】 文中研究了一种无线电定位的新方法,该方法首先将直接序列的扩频信号分成两路低速的窄带信号,然后每路窄带信号再调制互相正交的载波发射,在接收端恢复出原来的高速直扩信号,再使用常规方法得到传输时延,测量出目标的距离。通过分析和仿真,将常规直扩系统的性能和该扩频测距系统的性能做了比较,结果证明在码噪声可忽略的情况下,该方法在带宽仅占常规直扩系统一半的情况下,能够达到与常规直扩测距系统几乎完全相同的测距不确定性,有效地利用了频谱。更多还原

【Abstract】 The paper investigates new method to exploit sequencesplit in radiolocation system. The technique first splits conventional DSSS (Direct Sequence Spread Spectrum) signal into two lowerrate, narrowerbandwidth components, then these are transmitted by modulating orthogonal carriers, signals are recombined at receiver. By analysis and simulation, its performance compared to that of conventional DSSS system. The analytical results indicate that the range measurement uncertainty of this technique can be made almost identical to that of conventional wideband system assuming that code self-noise is negligible, but spectrum efficiency can be improved greatly compared with conventional wideband system.更多还原