CZ-4C succeeds in launching Yaogan 33-02 satellite

CZ-4C succeeds in launching Yaogan 33-02 satellite

2022/09/20 09:07
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At 07:44 on September 3, 2022, CZ-4C Y52 launch vehicle blasted off at Jiuquan Satellite Launch Center, and succeeded in sending Yaogan 33-02 satellite into the preset orbit, marking a complete success of the launch mission, and both the satellite and the rocket are developed by Shanghai Academy of Spaceflight Technology

This is the 93rd launch of CZ-4 series of launch vehicle, the 166th launch of Long March series of launch vehicle developed by Shanghai Academy of Spaceflight Technology, and also the 435th launch of Long March series of launch vehicle.

CZ-4C launch vehicle is a 3-stage liquid rocket with propellant at normal temperature, with excellent performance and extensive usages. In respect of different types of satellites, CZ-4C series of launch vehicle can adopt flexible launch plans, and is capable of launching various satellites with different orbit requirements, and also launching one satellite or several satellites at the same time, and its carrying capacity at sun-synchronous orbit can reach to 3 tons (orbit altitude: 700km).


Yaogan 33-02 satellite is mainly used in scientific experiments, territorial resource surveys, yield estimation of agricultural products, disaster prevention and reduction, etc.



Rocket test team: Strike from three directions, and join forces for battle


CZ-4C Y52 launch vehicle is the 8th launch mission of CZ-4 model this year. As the pandemic is gradually normalized, the model personnel fully carried forward the spirit of "going wherever I’m needed", adhered to the "three-only" development concept, treated each launch as the first launch, concentrated their efforts, worked steadily, and continued to practice the development model of "high quality, high efficiency and high benefits”. Given the difficulties brought by the pandemic to mission arrangement, three groups of personnel were arranged to assemble at Jiuquan Satellite Launch Center from two places. They traveled for thousands of miles only for success: the first team was a “pioneer team” that left Shanghai in advance for centralized isolation at the frontline, while the second team was a "mobile brigade" that just completed the launch mission in Taiyuan and arrived at Gobi by bus in one day, and the third team was a “special troop” that had continuously worked for days implementing general assembly, tests and entry. Given the current pandemic situation, the test team formulated special pandemic prevention measures, strictly adhered to the red line of pandemic prevention, and strictly implemented corresponding requirements of the region and the launch site. Although Jiuquan is still extremely hot in August and September, the test team members kept on working in order at the launch site with protective clothes, to ensure no delay of the task mode.


CZ-4 test team is featured with more freshmen for old positions, and experienced workers for new positions. Cang Biao, General Director of the Rocket, reminded the test team members: "freshmen taking up their positions for the first time should accumulate more experience in the actual operation at the launch site, while experienced workers should help them, and although they are experienced, they shouldn’t be negligent for their new positions, and should always remember to check the product equipment, make clear disclosure, and fully understand the technical status.” The test team carried forward the spaceflight “mentoring” tradition, and adhered to the principle of “one experienced worker mentoring one freshman”, to help the “younger generation” to experience and devote themselves to spaceflight, and move faster to join in the force to build China into a powerful country of spaceflight. Due to weather conditions, the model transfer progress was advanced, so in order to guarantee the node, the test team worked hard to guarantee the progress and the quality with the vigorous cooperation of the launch site, and then completed rocket hanging, recovery, equipment installation, product test and transfer within less than one week. By practicing at the frontline, the younger generation of spaceflight has accumulated valuable operating experience at the launch site, and will gradually play a critical role in subsequent tasks.


This is the third launch of CZ-4 mode based on full-autonomous alignment technologies, and as the previous tasks were constantly improved, a better effect was obtained in the test method, interpretation requirements and plan disposal. In addition, the test status was unified and the electric test procedure was optimized, and the efficiency was also improved, while eliminating frequent switch of status. To make the system more reliably, the rocket was subject to reliability change in the relief valve of the pressurization system, and the changed valve status is more suitable for the box pressure.


In respect of the work at the launch site, CZ-4 test team adopted “the regular meeting of daily clearing system”, “the closed-loop implementation of the to-do-list” and other management measures, to “spare no details”. Meanwhile, based on the model task features, the team also re-sorted and implemented “confirmation system strategy”, adjusted and optimized “digital management system”project, improved the effectiveness of quality assurance at the launch site, and also made the work more complete, refined and efficient.


Satellite test team:Optimize process, and improve efficiency


Yaogan 33-02 satellite development team adhered to the glorious tradition of “independent innovation, hard work, rigorousness, vigorous collaboration, and harmonious win-win”, and overcame huge difficulties and tight schedule, to guarantee the satellite development progress. In addition, by sticking to the work style of “guaranteeing node, resolving difficulties, sharing responsibilities, and daring to achieve”, the team also applied innovative thinking, optimized the process, and implemented confirmation system comprehensively, and guaranteed the quality and schedule of satellite development and launch mission.

During the pandemic, the development team adopted innovative methods, including "stand-alone remote acceptance, whole-satellite remote testing, and large system remote docking", to ensure that satellite development was completed on schedule with high quality. After the model was delivered, the test team planned in advance and implemented precise measures, to ensure that personnel from multiple regions can work on schedule according to the pandemic prevention and control requirements in Shanghai, Jiuquan, Xi'an and Beijing, to guarantee the successful completion of the launch mission.

Given the intensive launch missions and the shortage of personnel, the satellite development team implemented the requirements of Shanghai Academy of Spaceflight Technology for the optimization of satellite development process, undertook their responsibilities, and fully demonstrated and implemented the railway transport of the whole satellite, the transport of satellite with batteries, canceled the deployment test of initiating devices, and simplified test items at the launch site. After changing to the whole-satellite transport with batteries, the quantity of plug-ins operated at the launch site was reduced to 10pcs from 94pcs, and the operating time of general assembly before electric test was reduced to 1.5 days from 6 days, and high-risk items were also reduced, such as satellite closure, charged plugging and unplugging. Meanwhile, the test of initiating devices was also canceled, and more than 80 test operations and middle confirmation links were eliminated. Besides, satellite test items within the technical area were also simplified, and the configurations for both field personnel and equipment were decreased, improving the work efficiency significantly.

The development team adopted the principle of “equal standards, requirement coverage, complete projects, and effective implementation” as the factory quality assurance system, and the “implementation of responsibility, physical inspection, data comparison, and record review” as the approaches, and included satellite AIT process and result as well as success envelope line analysis, special items for delivery and other work into the confirmation items, and formed 30 general confirmation forms, and 149 data record forms, covering the content of model delivery standard, and optimizing the technical review of spaceflight models.


Meanwhile, the satellite test team also combined the quality assurance system work with the information tool of the “data package management system for satellite products of Shanghai Academy of Spaceflight Technology”, implemented “online quality assurance for the entire process”, and achieved “field paperless office”, formed 48 general confirmation forms, 283 process record forms, and achieved the objective of “same operation, same collection, and same confirmation” for quality assurance, significantly improving the working efficiency and achieving the quality objective with high efficiency.