MODEL FOR DETERMINING FLIGHT TIMES OF EARTH REMOTE SENSING SPACECRAFT MOVING IN CIRCULAR ORBITS OVER THE EMERGENCY PUBLIC WARNING AREA

The article considers the issue of determining the flight times of the orbital constellation of Earth remote sensing spacecraft moving in circular orbits over the emergency warning zone of the population (the territory at risk of the occurrence of dangerous natural phenomena and technogenic processes rapidly developing in time and space, posing an immediate threat to the life and health of people on it). As part of solving the problem, an algorithm for determining the flight times of the orbital constellation was developed, computational experiments were performed, pessimistic estimates of the maximum number of flights of a given orbital constellation of spacecraft were obtained, and time gaps in the observability of the emergency warning zone were established. The algorithm and model are based on a
graph-analytical method for studying the motion of spacecraft using the basic theorems of spherical trigonometry.