Download LAMBDA source code

The key of precise GNSS applications is to resolve the double-differenced (DD) carrier phase ambiguities. One of the methods to do this is the LAMBDA method which was introduced by Teunissen (1993) and developed at the Delft University of Technology in the 1990s. LAMBDA stands for Least-squares AMBiguity Decorrelation Adjustment.

With the LAMBDA method, the integer least squares (ILS) ambiguity estimates are computed in two steps. First the ambiguities are decorrelated, by means of the Z-transformation. The decorrelation is essential to allow for an efficient search for the integer candidate which solves the integer minimization problem. This search is the second step in the LAMBDA method.

Fill the form below and press Submit to obtain the compress file with the selected version of LAMBDA. It may be necessary to use 7zip to decompress the file. For questions or problems concerning LAMBDA please contact Sandra Verhagen at or Bofeng Li at

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