CBERS-1 satellite infrared multispectral scanner s

e707004304

CBERS-1 satellite infrared multispectral scanner subsystem

Scanning mirror scan conversion from positive to negative scans, require large scanning mirror to provide its population the reverse torque generated by the motor drive control circuit alone in this moment is difficult to achieve, so the design uses a spring to provide reverse torque. The spring component requirements include: 1) to provide units suitable reverse torque; 2J quality small; 3) stiffness should be large enough; 4) has a good linear and high stiffness characteristics of the implementation of the recovery approach as follows: 1) on-chip take full advantage of the spring leaf spring in the form of small deformation, the small load condition with high linearity and high elasticity of the advantages. 2) The election density, high modulus, good fatigue properties of materials. 3) to optimize the design. Optimized geometry, makes the stress distribution, and in high-stress conditions, the stability. Long life. 4) The impact of reed contact surface for the head of a special shape design, the reed in the deflection, the two relative sliding contact surface to reduce,[link widoczny dla zalogowanych], increase rolling friction, reducing friction and wear caused by the amount of energy loss and improve recovery coefficient and prolong life. 5) optimize the process to ensure that the cut leaf spring groups and linear degree of consistency. And other high-Sentinel: CBERS-1 satellite infrared multispectral scanner subsystem 336) in the corresponding collision block, embedded in non-metallic composite materials, to effectively absorb the energy generated by the collision shock, reduce noise, to resolve the collision between anti-cold welding problems. Technology developed by the above leaf spring assembly is simple, reliable, easy to process. In practice, fully achieve the desired results, and reduce noise, vibration small, mirror on the structure and the impact of the body is small, the disturbance on the satellite platform to meet the requirements of the satellite attitude control, in order to verify the performance of the stability of leaf spring assembly and life, 107 times its fatigue life test results showed that no significant changes in the stiffness of the reed, stable at 0.5%. 2.4 The high stability of the scanning device design and development of base 1) base on the requirements of three-axis scanning device overall stiffness:> 3000kg · f / ram; resonant frequency greater than 160Hz. 2) to implement ways to use the overall structure of cast titanium alloy ring, and the lightweight design. The vibration test assessment, to design specifications, to meet the requirements. 2.5 low-power, high accuracy, high stability control technology meter locking phase-locked scanning device driver motor and motor drive control circuit is to ensure the accuracy of scanning subsystem, an important part of motion characteristics. Control the scanning mirror swing required to achieve the overall requirements of indicators. Solutions include: 1) design uses a brushless DC limited angle,[link widoczny dla zalogowanych], the torque motor and the speed of the motor function combined, the results of a compact, good control characteristics. 2) control circuit using proven, reliable locking, lock control and speed feedback. The accuracy and stability of the optical signals provides the position signal, give it away PLL section, the phase frequency detector, and provides for the signal; use of speed feedback signal generated by the motor speed feedback control 3) and flexible pivot, the magnetic compensation, together constitute the leaf spring torque balance system so that the swing speed of scanning mirror even, to ensure that scan linearity, consistency and repeatability scan positive and negative indicators. 2.6 In view of system integration testing techniques, scanning subsystem set of optical, mechanical, electrical, thermal, magnetic in one, a complex, and each has a relative independence, the process of mutual coupling, there is some interference and does not match Therefore, we must rely on the careful assembly and debugging the ground to achieve the target, establish a set tune,[link widoczny dla zalogowanych], test methods is required. The measures taken are as follows: 1) scanning mirror assembly for static balance. Reduce the influence of gravity, reducing difficult to control and reduce the disturbance of IILMSS subject. 2) on the reed,[link widoczny dla zalogowanych], the dynamic performance of pivot selection, matching use. 3) Magnetic compensator magnetic components test screening, matching use. 4) eliminate the influence of gravity in the state of the system under the FBI. 5) The design and development of the scanning subsystem linearity testing, providing adequate and convenient measurements. 3 application of CBERS-l scanning subsystem prototype development of experienced, look machine-like and positive early prototype, in which prototype continuous operation through the life span of laboratory tests, the system functions properly, the performance indicators in line with design requirements; participating in IRMSS location imaging test prototype working properly,[link widoczny dla zalogowanych], made a good picture; first prototype took part in all the experiments, and training tasks to complete the base station; are prototype has been in the sky for nearly two years, obtained through telemetry parameters and image view, meet the design specifications, stable operation. About the author: High Guards, male, born in 1970. 1993 Graduated from the dark Harbin Industrial University. Undergraduate. Engineer. Yuan Li. Male, born in 1966: Graduated from Tsinghua University in 1989, undergraduate. Engineer.