有限带宽信道条件下的Double-delta技术多径抑制性能分析及优化设计

The Multipath Mitigation Performance of Double-delta Technique in Band-limited Receiver Channels

以一种基于码跟踪多径误差包络的多径抑制性能评估准则为基础,首先根据Double-delta技术的基本原理,首次推导出了其在无限带宽时的码跟踪多径误差公式,并由此得出了Double-delta技术的理论性能计算公式;然后以数值计算的方法分析了不同信道带宽条件下Double-delta技术的多径抑制性能。仿真结果表明,当信号传输链路的信道带宽有限时,Double-delta技术的多径抑制性能在其相关间隔与信道单边带宽的乘积等于1时达到最优。

Double-delta technique is one of the most widely-used and actively-investigated multipath mitigation techniques in GNSS.It is significantly important to analyze the multipath mitigation performance of Double-delta technique in band-limited receiver channels,but seldom has it been referred in any former researches.The multipath error formula for Double-delta technique is derived for the first time after the introduction of tits basic theory.Three criteria,envelope peak,effective envelope length and envelope area,for multipath mitigation capability evaluation based on the multipath error envelope and their calculation formulae in infinite channel band are introduced.With these criteria,the multipath mitigation performance of Double-delta technique with different channel bandwidths are calculated and analyzed.It is drawn from the simulation that when the product of the correlator spacing and the single-side bandwidth is equal to one,the best multipath mitigation performance is achieved for Double-delta technique.