High Resolution Delay Estimation in Urban GNSS Vehicular Navigation
Bibliographic record
Abstract
Multipath propagation causes major impairments to satellite based navigation systems and is often the dominant source of accuracy degradation and a major issue for high precision Global Navigation Satellite System (GNSS) applications. Most of the commonly used time-of-arrival estimation techniques cannot provide the required estimation accuracy in severely dense multipath environments such as urban canyons. In this paper, the Doppler spectrum broadening (Doppler spread) of the fast fading channel (where the rate of the variations of the channel is faster than the symbol rate of the signal) resulting from the motion of the receiver or surrounding objects is employed for the purpose of signal decorrelation for the high-resolution estimation of multipath delays through the subspace-based Multiple Signal Classification (MUSIC) technique. Specifically, delay-domain correlator outputs at different Doppler frequencies will be combined to enhance the rank of the signal autocorrelation matrix. Theoretical simulation and processing results of real data collected in downtown Calgary are presented to compare the performance of the proposed method with the spatial-temporal-diversity based MUSIC technique and a widely available algorithm in commercial GNSS receivers, namely the double-delta correlator technique. The performance metrics are based upon pseudorange and positioning errors. The pseudoranges and positions computed by the proposed techniques are compared to the reference trajectory established using a high precision Inertial Measurement Unit (IMU) .
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".