The Dalian-1 Lianli satellite,a 17-kg 12U high-resolution remote sensing CubeSat,was developed to validate a series of innovative technologies,including submeter high-resolution remote sensing imaging,the highreliabil...The Dalian-1 Lianli satellite,a 17-kg 12U high-resolution remote sensing CubeSat,was developed to validate a series of innovative technologies,including submeter high-resolution remote sensing imaging,the highreliability OpenHarmony real-time operating system(RTOS),and the nontoxic hydroxylamine nitrate propulsion system.Launched on 2023 May 10,aboard the Tianzhou-VI cargo spacecraft,the satellite was successfully deployed into orbit on 2024 January 18,following 253 d of in-orbit storage at the China Space Station.Most traditional micro/nanosatellites have poor reliability and real-time performance due to the lack of an RTOS.The satellite uses the free,high-reliability OpenHarmony RTOS with a small kernel for memory-limited microcontroller subsystems.The OpenHarmony RTOS was ported to 3 attitude determination subsystems—a magnetometer,a digital interface sun sensor,and an attitude measurement unit—to test its feasibility in micro/nanosatellites.The ground test and on-orbit verification focused on realtime performance and reliability.Ground tests indicated that the task switching time of the OpenHarmony RTOS averaged≤2μs,and the 3 subsystems continuously and stably operated for more than 1,000 h,and the stable update rate of data for all 3 subsystems had been substantially improved.During on-orbit operations,the telemetry data from the 3 subsystems were normal,demonstrating high stability and reliability and the ability to quickly respond to external events or data.These results lead to the conclusion that the real-time performance and reliability of the subsystems were substantially enhanced after being ported with the OpenHarmony RTOS.Additionally,with the assistance of the 3 subsystems,the Dalian-1 Lianli satellite successfully captured remote sensing images with a resolution better than 1 m,meeting the expected requirements.It is anticipated that in future space missions,more micro/nanosatellites will adopt subsystems ported with the OpenHarmony RTOS.展开更多
基金support provided by the National Key Research and Development Program of China(Project No.2021YF E0116000)the Fundamental Research Funds for the Central Universities(Project No.DUT22ZD208).
文摘The Dalian-1 Lianli satellite,a 17-kg 12U high-resolution remote sensing CubeSat,was developed to validate a series of innovative technologies,including submeter high-resolution remote sensing imaging,the highreliability OpenHarmony real-time operating system(RTOS),and the nontoxic hydroxylamine nitrate propulsion system.Launched on 2023 May 10,aboard the Tianzhou-VI cargo spacecraft,the satellite was successfully deployed into orbit on 2024 January 18,following 253 d of in-orbit storage at the China Space Station.Most traditional micro/nanosatellites have poor reliability and real-time performance due to the lack of an RTOS.The satellite uses the free,high-reliability OpenHarmony RTOS with a small kernel for memory-limited microcontroller subsystems.The OpenHarmony RTOS was ported to 3 attitude determination subsystems—a magnetometer,a digital interface sun sensor,and an attitude measurement unit—to test its feasibility in micro/nanosatellites.The ground test and on-orbit verification focused on realtime performance and reliability.Ground tests indicated that the task switching time of the OpenHarmony RTOS averaged≤2μs,and the 3 subsystems continuously and stably operated for more than 1,000 h,and the stable update rate of data for all 3 subsystems had been substantially improved.During on-orbit operations,the telemetry data from the 3 subsystems were normal,demonstrating high stability and reliability and the ability to quickly respond to external events or data.These results lead to the conclusion that the real-time performance and reliability of the subsystems were substantially enhanced after being ported with the OpenHarmony RTOS.Additionally,with the assistance of the 3 subsystems,the Dalian-1 Lianli satellite successfully captured remote sensing images with a resolution better than 1 m,meeting the expected requirements.It is anticipated that in future space missions,more micro/nanosatellites will adopt subsystems ported with the OpenHarmony RTOS.
