| Small video information monitoring satellite also called video small satellite can obtain the target regioned video information,so as to realize continuous monitoring the dynamic situation of the target region.For one point,due to the limited resolution,the orbital altitude of video satellites is usually low so that coverage time of one single satellite is short.Besides,the cost of building a video constellation in order to achieve global coverage is beyond allowable budget.Therefore,constructing a regional coverage constellation is one of the effective ways to solve the problem of deploying long-term surveillance in local hotspots.For another point,satellite intelligence is limited due to the insufficient on-board resources.The human-in-the-loop mode integrates human and machine intelligence into the satellite control loop and effectively solves the problem of tracking moving targets under complex environments in regional surveillance.This paper takes the video small satellite constellation system based on human-in-the-loop mode for regional coverage as the research object,and carries out research on constellation design,ground station deployment and constellation system effectiveness evaluation,which includes:1.Explaining the related concepts,characteristics and requirements for the constellation system object to man-in-the-loop,introducing several commonly used constellation configurations,and analyzing the ground station deployment requirements for the needs of the man-in-the-loop.2.Aiming at the problem of constellation design for target area coverage,a method of common ground trajectory constellation network design for human-in-the-loop target area is proposed.The satellite orbit designed by this method can continuously cover the target region multiple times per day,and the constellation network design is able to achieve long-term coverage of the target region.Using Donglang as the target region for simulation analysis,repeated ground-track constellation schemes with different networking methods was designed,and compared with the Walker constellation in performance such as the revisit time,coverage,duration and constellation versatility.The comparison and analysis have verified that compared with the Walker constellation,the repeated ground-track constellation has more advantages when designing for target region coverage,and can achieve better coverage with fewer satellites.3.Aiming at the problem of ground station deployment that satisfies the human-in-the-loop satellite control and real-time data transmission requirements,a ground station deployment method considering the satellite digital transmission beam angle is proposed,and the ground station deployment scope under different beam angles is given.Based on the designed scheme of satellite constellation,and using the simulation analysis of Donglang as the target region,the ground station deployment plan for the target region is designed,and the visibility verification is carried out,which proves the effectiveness of the method.4.Aiming at the effectiveness evaluation problem of human-in-the-loop-based constellation system,a method is proposed.This method can quantitatively evaluate the effectiveness of the human-in-the-loop video constellation system based on various mission requirements.The evaluation result of the constellation system is analyzed,and the decision-making basis of the constellation system is obtained.Based on the designed repeated ground-track constellation and the ground station deployment plan,four constellation system schemes were designed as evaluation cases,and the constellation system schemes of different satellite networking and different ground station deployment methods were simulated and verified,the simulation results demonstrated the feasibility of the evaluation method.This research provides theoretical supports for the construction of regional coverage video satellite constellation systems and a reference basis for the deployment and application of mobile ground stations.It also has practical significance in assisting our country quickly deal with regional emergencies. |
