That is an internal DLR algorithm. It is not possible to share the source code publicly. If you need to estimate channel parameters I can recommend Superfast Line Spectral Estimation that is available online: github.com/badrinarayan/astlinespec
It provides superior performance compared to SAGE algorithm for channel estimation that is the backbone of KEST. Then implementing a stacked Kalman filter to track multipath components is doable using the KEST original paper from Thomas Jost: Detection and Tracking of Mobile Propagation Channel Paths
If you need Channel-SLAM I could provide some guidelines but again the code is not publicly available.
