This article summarizes the reports and researches on detection system of STSS published in domestic and foreign literature, summarizes the development process of STSS detection system from a single geostationary orbit to a combined large elliptical orbit, then to the development process of the high-track network and the low-track network cooperate with each other. It also summarizes the development process of infrared detectors from single-band to multi-band, from line scan with less detection pixels to line scan with more detection pixels and large-area staring array. The application scenarios, overall scheme, and overall parameters of the STSS detection system are sorted out, and the core technical indicators are analyzed for the overall parameters. From the perspective of the development process of the US early warning satellite system and the technical characteristics of the space-based infrared system, US early warning satellite technology is of great significance to research on US defense programs, equipment, and system capabilities.
Spacecraft cluster flight, which is a novel multi-spacecraft flight mode, has become an important research direction of distributed space system for the future, especially has unique advantage in continuous detection on area. Aiming at the satellite group formed by several satellite clusters, an orbit design method satisfying the long-term continuous and stable area-coverage is proposed. The basic dynamic model is built under the influence of J2 perturbation, the calculation method of "node period" and "node day" is put forward and then the long-term continuous stable group orbit initialization design conditions are built. Validation of orbit design is made under the typical scenario and through the STK simulation, the simulation results show that this design method can realize the fixed time revisiting and long-term stability of coverage of the target area.