LAMBDA Algorithm for GPS Ambiguity Resolution with MATLAB Implementation

This article presents the MATLAB source code for the famous LAMBDA (Least-squares AMBiguity Decorrelation Adjustment) algorithm used in GPS ambiguity resolution. The algorithm employs integer least-squares estimation with decorrelation techniques to efficiently resolve carrier-phase ambiguities in GPS signal processing, significantly improving positioning accuracy and reliability. Key implementation aspects include Z-transformation for decorrelation, integer searching strategies, and validation procedures. Mastering MATLAB programming and understanding this algorithm's code structure - particularly the matrix operations for ambiguity covariance transformation and efficient integer candidate search methods - are fundamental skills for GPS software development. By studying and applying this source code, developers can deepen their understanding of GPS technology, master core techniques in GPS software development, and establish a solid foundation for creating more efficient and high-quality GPS applications.