Keeping up with the needs of the troops to engage in scientific research
【Knowledge·Military·Life】
"Where am I?" "Where am I going?" In the perilous deep sea, if there is no inertial navigation system, the submarine is a "headless fly".
Wei Guo, an associate researcher at the School of Frontier Interdisciplinary Sciences at the National University of Defense Technology, has followed the team to develop the inertial navigation system for 14 years. He has almost single-handedly overcome the core algorithm problem of the inertial navigation system, helping our submarines to have a "brain" with high-precision autonomous navigation capabilities. .
"Being able to contribute to great powers and weapons", Wei Guo is very proud.
"This algorithm you have to win"
Wei Guo's tutor is Professor Long Xingwu, an expert in the field of laser gyroscope and its inertial technology in my country. Wei Guo is one of the few students of Teacher Long who studies measurement and control technology.
"Mr. Long has always only given the general direction to the students, and he has very high requirements for engineering." In 2007, Wei Guocai, who was just a graduate student, learned that he even has knowledge in "screwing screws", "We must consider stress balance, and the first one must be spared. Afterwards, the screws should be gradually applied diagonally in order..." Mr. Long's meticulous attention to detail deeply influenced Wei Guo's scientific research style.
In the inertial navigation system, the laser gyro is the hardware core, and the navigation algorithm is the software core.
At the critical stage of the development of the engineering prototype, Wei Guo, who is still studying for a doctoral degree, was ordered to tackle the core navigation algorithm of the system urgently. Long Xingwu asked: "Wei Guo, you must win the algorithm of the previous model!"
In the absence of relevant data and supporting software, Wei Guo used "stupid methods" to understand the interfaces one by one, adjust the program, and "understand the temperament of the top", trying to find a way to make the top play 100% or even 120% in the system. % efficiency.
For 3 months, he worked hard in the laboratory on the first floor of the basement.
"The mobile phone signal there is weak and quiet." Adjusting the program is a meticulous task. Tens of thousands of lines of code need to be checked repeatedly. A line of code that has been passed more than 20 times a week ago will be checked several times a week later. Half-width errors are not tolerated.
"Any problem with the algorithm is not a small problem, it directly affects the accuracy of the system," he said earnestly.
In the windowless and poorly ventilated "little black room", in front of an old-fashioned desk one meter square, Wei Guo wrote a software algorithm suitable for a high-precision inertial navigation system.
"It can perceive the subtle errors caused by the periodic changes of the geophysical field." At that time, only two domestic navigation systems could achieve such accuracy, and the National Defense Science and Technology University was one of them.
"We must ensure the important tasks are guaranteed"
When Wei Guo boarded a new type of submarine for the first time, he was nervous and excited: "I told myself that we must ensure the important tasks of the army." Wei Guo is tall and the space in the cabin is small. In order to debug equipment, he squatted for a day. , covered in oil stains.
During this protection, Wei Guo discovered: "The new submarine is different from ordinary submarines, and its internal heating and cooling is not severe."
The original temperature compensation algorithm of the inertial navigation system follows the aviation mode of rapid heating and cooling, and the algorithm that does not match the environment will affect the long-term accuracy of the system.
Wei Guo customized the temperature box, simulated the temperature environment of the new submarine, measured data, modified the algorithm, and finally established a temperature compensation model suitable for the new submarine.
One problem was solved, and a new one appeared - the inertial navigation system took a long time to start, and the Navy must set sail immediately after receiving the order, requiring the equipment to be activated in an emergency.
After calculation, Wei Guo determined that the mobility of the carrier could be improved by losing a certain degree of system accuracy. He proposed the zero position holding technology of the navigation inertial navigation system to save time and improve the accuracy at the same time.
In addition, he improved the Kalman filter based on the submarine motion characteristics and rotational modulation technology, and realized the start-up and comprehensive correction at sea without damping, ensuring that the system still has high precision without external information.
With the increase in the number of inertial navigation systems used by the troops, the officers and soldiers also asked: "I don't know which set has the highest accuracy when using it. Can you test it?" Therefore, Wei Guo developed a joint positioning system that can evaluate the navigation accuracy of different systems before sailing. The device, after the submarine dives, realizes the complementarity of the two sets and improves the common accuracy. The Navy evaluates the device as "relying on the existing, superior to the existing.
Some officers and soldiers said: "I thought that the college could not solve our practical problems, but now it seems that you are really good!"
"Where the needs of the army are, our research will go deep." Relying on the scientific research attitude of striving for perfection, Wei Guo successively won the first and second prizes of military science and technology, and a certain research achievement was evaluated by the appraisal committee as "domestic leading, international advanced". .
"Going out can't disgrace the country"
The heavy results could have been "digested" for a period of time, but Wei Guo, who couldn't sit still, found a new challenge - to carry out international peacekeeping tasks.
As a military observer in the Juba theater in South Sudan for the first time, he worked overtime and was familiar with various standard operating procedures and combat orders in the mission area, the pronunciation of spoken English in various countries, the communication and logistics in the team, and different types of patrol and verification tasks..." Come out Peacekeeping is to represent China's image, and it cannot embarrass the country." In the tense peacekeeping, Wei Guo still guaranteed scientific research tasks.
"Before going abroad, I automated everything that could be automated at hand." For example, for turntable calibration, Wei Guo wrote a program to ensure that it can be completed with one click.
There were some things he needed to do manually, so Wei Guo took advantage of the 5-hour time difference between South Sudan and China to hurry up.
When my domestic colleague fell asleep, it was just dark and he was working overtime.
During the peacekeeping period, Wei Guo followed up an in-flight navigation project in cooperation with other units, and achieved a good result in the overall comparison test. After returning to China, he was selected into the military high-level scientific and technological innovation talent project.
At the end of the peacekeeping mission, Wei Guo was awarded the United Nations Peace Medal, the highest honor of the "Commander-in-Chief's Commendation" of the troops of the United Nations Mission in South Sudan, and the comprehensive performance was rated as the highest level - "outstanding" by the United Nations.
Returning to China from the haunted South Sudan, when the plane landed at Pudong Airport, Wei Guo breathed in the air of his motherland.
He said: "I have experienced a foreign battlefield full of gunpowder smoke, and now I return to a scientific research battlefield without gunpowder smoke. I have a better understanding of the direction I should go. A strong country can only have confidence outside, and the hard power of science and technology is one of our greatest confidence. ."
(Reporter Liu Xiaobing, correspondent Yan Jin)