GECAM satellite system design and technological characteristic

The Gravitational wave high-energy Electromagnetic Counterpart All-sky Monitor (GECAM) is proposed to explore the significant opportunity of the gravitational wave multi-messenger astronomy by monitoring the gravitational wave high-energy electromagnetic counterpart in all-sky. Based on the satellite science and observation requirements, we propose the design philosophy and schemes of the GECAM satellite system, including the system configuration and main technical parameters, observation requirement analysis, and satellite orbit, attitude, and operation mode design. Further, we summarize the technical characteristics and solutions of satellites, including the satellites all-sky field of view burst source location technology, multi-constraint satellite pointing design, the real-time downlink telemetry technology of trigger information based on the Beidou-3 global position reporting system, the integrated design electronics with low cost and high reliability, and the electromagnetic compatibility design of highly intensive satellite. The GECAM satellite can achieve an all-sky field of view, high sensitivity, good positioning accuracy, and wide energy coverage through system design and optimization. Also, it has the capability of on-orbit trigger positioning and quasi-real-time downlink of detection alerts, satisfying the comprehensive requirements of the detection of gravitational wave gamma-ray bursts and other high-energy transient sources.