What is the difference between Dayang No.1 B and Dayang No.1 A?

In order to promote the development of China's ocean remote sensing and replace Ocean-1 A satellite, the State Oceanic Administration and China Aerospace Science and Technology Corporation launched the demonstration of Ocean-1 B satellite project in June 5438+ 10, 2004. In August 2004, Aerospace Dongfanghong Satellite Co., Ltd. of China Academy of Space Technology, which is responsible for satellite development, cooperated with the user department of the State Oceanic Administration and other relevant departments to complete the demonstration of user demand, load index and launch vehicle. In July, 2005, the Commission of Science, Technology and Industry for National Defense approved the establishment of Haiyang-1 B-star, and officially issued the task of developing Haiyang-1 B-star.

Satellite technical indicators. Haiyang-1 B satellite has a mass of 442.5kg and a life span of 3 years. It runs in a sun-synchronous orbit of 798 km, with a period of 1 day and a coastal imager of 7 days, and adopts three-axis stable orientation to the ground. The resolution of its water color scanner is 1 100m and the number of pixels is 1664.

What's the difference between star B and star A? According to the characteristics and special requirements of ocean water color detection, the overall index and load index of the satellite are adjusted. Compared with Haiyang-1 A star, the technical status of Haiyang-1 B star has changed greatly.

The service life of the satellite is increased from 2 years to 3 years; The pixel number of water colorimeter is increased from 1.024 yuan to 1.644 yuan, and the visual angle of water colorimeter is increased, so that the coverage period of water colorimeter is increased from 3 days to 1 day; The spectral bandwidth of the coastal imager is improved; Load imaging consists of 2 >: 3 tracks are added to the layout, and 3 tracks are detected simultaneously by water color instrument and coastal zone imager. Foreign water colorimeter or coastal zone imager detects 4 >: 5 trajectory; The storage capacity of on-board image data and the total downlink code rate of data transmission have been greatly improved. The battery array driver changed from one driving two solar wings to two driving one solar wing.

As can be seen from the above data, compared with the Haiyang-1 A star launched five years ago, the detection capability of the B star has been greatly improved. As experts from the Center for Marine Satellites and Applications of the State Oceanic Administration said. Because the pixel number of B-star payload ocean color detector is 1 0,664, which is much higher than A-star's 1 0.24, and the data recording capacity also increases exponentially, in the past, A-star could only record 1 orbital data in an overseas exploration. Star B can now record 4 to 5 tracks at a time. Therefore, 1 Haiyang-1 B star has the ocean water color detection ability equivalent to 3 Haiyang-1 A stars.

Technical state changes of large-scale systems. It is different from the launch of one arrow and two stars by Ocean-1 A star. Haiyang-1 B satellite was launched by Long March-2 C carrier rocket with one arrow and one satellite. This change will inevitably bring about changes in related interfaces.

In order to improve the reliability of the satellite, the technical status of the satellite platform has also changed greatly: the power supply capacity of the on-board power supply has been increased, and the area of the solar array has been increased to adapt to the change of the working time of the payload. Meet the requirements of user business operation; Remote control instructions and telemetry are added, which improves the ability of satellite on-orbit fault diagnosis; After the adaptability of satellite configuration is improved, the star size is appropriately larger than Haiyang-1 A star. In order to ensure the service life of 3 years, the fuel is increased from 13kg to 2 1kg.

System composition of satellite. The satellite consists of two parts: platform and payload, and consists of nine subsystems. The platform includes structure and mechanism, thermal control, attitude and orbit control, power supply, measurement and control, antenna, satellite service and overall circuit. Payload subsystem includes three subsystems: water color instrument, coastal zone imager and data transmission.

Carefully build high-quality marine satellites. The development of Haiyang-1 B star was officially launched in June 2004. The satellite cooperates with the user to complete the demonstration of load index change. In 2004, the Long March 2C carrier rocket was decided to launch a satellite. In July 2004, the user finally determined the overall requirements of the development; On June 5438+ 10, 2005, the college-level review of the scheme design of platform and payload subsystem was completed; On March 29th, 2005, the whole satellite scheme passed the review, and the development and production baseline of the satellite was determined.

In the process of satellite development, according to the satellite index requirements put forward by users, combined with the technical status of the satellite, based on the characteristics of large changes in payload and mature platform, the payload is divided into two development stages: initial sample and normal sample, and the platform products enter the business process of normal sample development step by step. Each subsystem has completed the production, testing and experiment of the product according to the requirements of the development technical process. After product acceptance, the whole satellite has completed structural assembly, pipeline welding of propulsion subsystem, leak detection, quality characteristic test, vibration test, software curing, heat balance and thermal vacuum test, magnetic test and reliability increase.

In order to ensure the long-term stable and reliable operation of the satellite, the whole satellite draws lessons from the experience of satellite engineering development in China from the early stage of model development, puts forward the reliability work plan, strengthens the reliability management, and implements the reliability engineering method of aerospace product development. At the same time, in order to strengthen the standardization of reliability work and enhance the systematicness and integrity of reliability work, the satellite put forward reliability requirements according to relevant requirements and combined with previous satellite reliability experience, and reviewed the design work.

In addition, a number of development and verification tests, such as on-orbit safety mode design, water color instrument verification test, solar wing deployment mechanism impact test and solar wing thermal vacuum test, were carried out, and 120-hour whole-satellite aging test was carried out to verify the factors affecting satellite reliability to the maximum extent, expose problems and reduce the probability of on-orbit failure.

In order to ensure the service life of the satellite for three years, by setting the satellite on-orbit safety mode, when there is a fault that may endanger the safety of the whole satellite power supply system or payload equipment, the satellite can judge and execute it independently on the ground and enter the on-orbit safety protection mode, thus blocking the fault and preventing the whole satellite from falling into a more serious fault, resulting in the complete failure of the satellite. The whole-satellite safety mode can cope with all kinds of expected faults including abnormal attitude control. After the expected failure, the satellite can enter the safety protection mode, which improves the reliability of satellite operation to a certain extent and meets the requirements of satellite service life.

In the satellite development project, micro-vibration test, vibration test, vacuum thermal test, magnetic test, docking test with users and ground stations, docking test with ground measurement and control system, docking test with launch vehicle and other large-scale tests have been carried out successively.

At the end of 2006. Haiyang-1 B satellite has completed all the work items specified in the development technical process, and the technical status of the satellite meets the design requirements, and its functions and performance indicators meet the requirements of users.

On March 1 day, 2007, Haiyang-1 B star passed the evaluation jointly held by the State Oceanic Administration and China Aerospace Science and Technology Corporation in Beijing. On March 6th, it passed the ex-factory assessment organized by the Commission of Science, Technology and Industry for National Defense. Stand by and deliver.

On April 1 1, 2007, Haiyang-1 B star was successfully launched.

On April 20, 2007, the remote sensing image of the first orbit of Haiyang-1 B star was officially received and released.

April 20th10,41. After Haiyang-1 B satellite was put into orbit, Beijing Station and sanya station of State Oceanic Administration accurately received real-time remote sensing images from the Sea of Japan to the South China Sea through coastal imager and water color scanner. The image of Haiyang-1 B star is rich in layers. Excellent image quality, clear images of Bohai Bay, Yangtze River estuary, Donghai Bridge, South China Sea and other sea areas, and rich information on ocean color and water temperature; The stable satellite attitude and excellent satellite quality exceed users' expectations.

Marine satellite ground application system is an important part of marine satellite engineering, which undertakes the task of reflecting application benefits after satellite launch. Through hard work, the State Oceanic Administration completed the system construction task within two years and completed the satellite-ground docking test as scheduled. Seven subsystems of marine satellite ground application system with independent intellectual property rights have been built, including receiving pretreatment, data processing, product archiving and distribution, application demonstration, radiation correction and authenticity testing, communication and operation control, as well as two satellite ground receiving stations in Beijing and Sanya and a marine water color remote sensing radiation correction laboratory. Therefore, Haiyang-1 satellite and ground system have become the same type of satellite ground application system designed and manufactured by China itself, with completely independent intellectual property rights, and the level is no less than that designed by the United States, Europe and Japan.

Ocean-1 b star