In an earlier work, Prof. Nazarenko discussed an atmosphere density tracking process that operates in parallel with the orbit determination process. This atmosphere density tracking process employs ballistic coefficient data observed over short arcs from multiple satellites. The process includes: 1. A procedure for constructing the density variations that operates on a 2- or 3-hour grid. 2. A procedure for estimating the true ballistic coefficients of the employed satellites that operates on a 28- or 56-day interval (1 or 2 monthly solar cycles). 3. Procedures for forecasting the atmosphere density at future times. This paper focuses on improving the algorithm for estimating the true ballistic coefficient of the employed satellites. The main aspect of this improvement consists of applying, for updating the ballistic factors of the nonstandard satellites, a linear function of altitude to model the systematic errors. Numerical testing based on simulated data has been undertaken to verify the correctness of the algorithm. The products of the study include a proposal to work with the real data. The possibility of complex utilization of data from both NORAD and the Russian Space Surveillance System is discussed.
