scholarly journals Guidance navigation and control for Chang’E-3 powered descent

2014 ◽  
Vol 44 (4) ◽  
pp. 377-384 ◽  
Author(s):  
Ping YU ◽  
Yu ZHAO ◽  
Ji LI ◽  
XiaoWen ZHANG ◽  
DaYi WANG ◽  
...  
Keyword(s):  
Navigation And Control ◽  
Powered Descent ◽  
And Control

scholarly journals Guidance Navigation and Control for Chang’E-5 Powered Descent

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Honghua Zhang ◽  
Ji Li ◽  
Zeguo Wang ◽  
Yifeng Guan
Keyword(s):  
Attitude Control ◽  
Measurement Data ◽  
Sensor Data ◽  
Measurement Unit ◽  
Critical Systems ◽  
Baseline Design ◽  
Attitude Maneuver ◽  
Navigation And Control ◽  
Powered Descent ◽  
And Control

To achieve the goal of collecting lunar samples and return to the Earth for the Chang’E-5 spacecraft, the lander and ascender module (LAM) of the Chang’E-5 spacecraft successfully landed on the lunar surface on 1 Dec., 2020. The guidance, navigation, and control (GNC) system is one of the critical systems to perform this task. The GNC system of previous missions, Chang’E-3 and Chang’E-4, provides the baseline design for the Chang’E-5 LAM, and the new characteristics of the LAM, like larger mass and liquid sloshing, also bring new challenges for the GNC design. The GNC design for the descent and landing is presented in this paper. The guidance methods implemented in the powered descent are presented in detail for each phase. Propellant consumption and hazard avoidance should be particularly considered in the design. A reconfigurable attitude control is adopted which consists of the quaternion partition control, phase and gain stabilization filter, and dual observer. This controller could provide fast attitude maneuver and better system robustness. For the navigation, an intelligent heterogeneous sensor data fusion method is presented, and it is applied for the inertial measurement unit and velocimeter data. Finally, the flight results of the LAM are shown. Navigation sensors were able to provide valid measurement data during descent, and the thrusters and the main engine operated well as expected. Therefore, a successful soft lunar landing was achieved by the LAM.

scholarly journals Powered-descent landing GNC system design and flight results for Tianwen-1 mission

Astrodynamics ◽  
2022 ◽  
Vol 6 (1) ◽  
pp. 3-16
Author(s):  
Xiangyu Huang ◽  
Chao Xu ◽  
Jinchang Hu ◽  
Maodeng Li ◽  
Minwen Guo ◽  
...  
Keyword(s):  
Control System ◽  
System Design ◽  
Large Scale ◽  
Autonomous Landing ◽  
Hazard Avoidance ◽  
Navigation And Control ◽  
Powered Descent ◽  
And Control

AbstractThe powered-descent landing (PDL) phase of the Tianwen-1 mission began with composite backshell—parachute (CBP) separation and ended with landing-rover touchdown. The main tasks of this phase were to reduce the velocity of the lander, perform the avoidance maneuver, and guarantee a soft touchdown. The PDL phase overcame many challenges: performing the divert maneuver to avoid collision with the CBP while simultaneously avoiding large-scale hazards; slowing the descent from approximately 95 to 0 m/s; performing the precise hazard-avoidance maneuver; and placing the lander gently and safely on the surface of Mars. The architecture and algorithms of the guidance, navigation, and control system for the PDL phase were designed; its execution resulted in Tianwen-1’s successful touchdown in the morning of 15 May 2021. Consequently, the Tianwen-1 mission achieved a historic autonomous landing with simultaneous hazard and CBP avoidance.

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