I'm propagating the trajectories of 2 LEO satellites (altitude 700 km) in 7 days. Calculating the radial, in-track and cross-track distances to determine the risk of collision.
JSPoC states that 0.5 km in the radial direction is enough for an alert. However, in 7 days SGP4 propagation the error accumulates.
How does error accumulate in this three directions per day? How to deal with error accumulation in risk assessment?