Pirsiavash Ali, Broumandan Ali, Lachapelle Gérard
Position, Location and Navigation (PLAN) Group, Schulich School of Engineering, University of Calgary, Calgary, AB T2N 1N4, Canada.
Sensors (Basel). 2017 Jul 5;17(7):1579. doi: 10.3390/s17071579.
The performance of Signal Quality Monitoring (SQM) techniques under different multipath scenarios is analyzed. First, SQM variation profiles are investigated as critical requirements in evaluating the theoretical performance of SQM metrics. The sensitivity and effectiveness of SQM approaches for multipath detection and mitigation are then defined and analyzed by comparing SQM profiles and multipath error envelopes for different discriminators. Analytical discussions includes two discriminator strategies, namely narrow and high resolution correlator techniques for BPSK(1), and BOC(1,1) signaling schemes. Data analysis is also carried out for static and kinematic scenarios to validate the SQM profiles and examine SQM performance in actual multipath environments. Results show that although SQM is sensitive to medium and long-delay multipath, its effectiveness in mitigating these ranges of multipath errors varies based on tracking strategy and signaling scheme. For short-delay multipath scenarios, the multipath effect on pseudorange measurements remains mostly undetected due to the low sensitivity of SQM metrics.
分析了不同多径场景下信号质量监测（SQM）技术的性能。首先，研究了SQM变化曲线，将其作为评估SQM指标理论性能的关键要求。然后，通过比较不同鉴别器的SQM曲线和多径误差包络，定义并分析了SQM方法对多径检测和缓解的灵敏度和有效性。分析讨论包括两种鉴别器策略，即用于BPSK(1)和BOC(1,1)信号方案的窄相关器技术和高分辨率相关器技术。还针对静态和动态场景进行了数据分析，以验证SQM曲线并检验SQM在实际多径环境中的性能。结果表明，尽管SQM对中长延迟多径敏感，但其在缓解这些多径误差范围方面的有效性因跟踪策略和信号方案而异。对于短延迟多径场景，由于SQM指标的低灵敏度，多径对伪距测量的影响大多未被检测到。
