Qelora
The computations behind the carrier-phase lessons.
Qelora teaching packages provide execution results used in the OpenGNSSLab LAMBDA and Double Difference tutorials. The website turns those exported numbers into explanatory equations, matrices and interactive figures, with the lesson data stored alongside the public pages.
LAMBDA: a controlled integer-search example
The standalone lesson starts from a synthetic three-ambiguity vector and covariance, then follows their actual Qelora solver execution. It exposes reduction factors, the integer transformation, search candidates, squared norms and a comparison between the API result and native trace. Synthetic inputs and executed solver results serve different purposes: this example explains the algorithm rather than demonstrating measured positioning accuracy.
Follow the LAMBDA numerical lessonDouble Difference: a real RINEX epoch
This lesson uses code and carrier-phase observations from two receivers at 2024-11-14 09:00:00 GPS time. Five common GPS satellites produce four double-difference pairs. The exports document selection, differencing, covariance, QR weighted least squares, LAMBDA candidate search and the constrained baseline. The lesson preserves the source convention: rover coordinates are held fixed while estimating the rover-to-base baseline.
Follow the Double Difference numerical lessonWhat the exports establish
Stored exports make the displayed arithmetic inspectable without running Qelora in the browser. The LAMBDA lesson describes an RTKLIB-style MLAMBDA kernel; it distinguishes this implementation from the original LAMBDA paper. The Double Difference lesson identifies imported and derived values, provides source hashes and labels the selected integer result as candidate-fixed, not validated.
These teaching examples do not establish multi-epoch RTK or PPK performance, independent position accuracy, or the reliability of an operational ambiguity acceptance policy. This page documents educational provenance; it does not provide a public Qelora software release or installation instructions.