Abstract
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.
Highlights
Many global navigation satellite systems (GNSS) applications have strict reliability requirements as they involve Safety of Life (SoL)services and critical missions such as aviation, maritime and land transportation
Results show that Signal Quality Monitoring (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
SQMeven metrics is lessposition and the multipath performance of the is significantly better than that of the geometry degradation
Summary
Many GNSS applications have strict reliability requirements as they involve Safety of Life (SoL). Sensors 2017, 17, 1579 diversity (e.g., [4,5]) is another solution to reduce multipath which relies on different polarization and arrival angles of the reflected signals These methods, require special hardware (antenna) considerations and modifications. In the context of reliability, the general approach to satisfy some level of navigation integrity is to detect and exclude (or de-weight) distorted measurements when exclusion does not degrade measurement geometry significantly (e.g., [7,8,9]) In this way, Signal Quality Monitoring (SQM). SQM metric effectiveness and sensitivity are defined based on multipath range error envelopes and the proposed SQM profiles These results are accompanied with an analytical discussion to evaluate SQM performance under different multipath scenarios.
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