Parameters of a propagated object state in a radar tracking system are converted from an object state domain to a measurement domain. The measurement domain includes parameters of a superposition of a chirp and a Doppler frequency of the reflected signal and the Doppler frequency. Deltas between measured states and propagated states are computed in the measurement domain to improve updating of the object state. An object track is more accurately updated based on the object state delta. Data association may be performed simultaneously in both the measurement domain and object domain. Propagated object state parameters in object domain coordinates can be checked for signal collisions to avoid signal collision errors. An improved noise model is also constructed in the measurement domain.