Millimeter wave landing radar is one of the important payloads of deep space landing probes, providing the landing probe with its distance and velocity information relative to the landing surface in the landing descent process to ensure landing accuracy and safety, and the landers of Chinese Chang'e Lunar Exploration Project and Mars Exploration Project are all equipped with millimeter wave landing radar. In this paper, a novel microwave landing radar with hybrid pulsedoppler and continuous wave work mode is presented. Analog and digital circuit integration technology with characteristics of light weight and small size is utilized to miniaturize the subsystems design,. This novel design can be applied to the follow-up project applications such as Chang'e Lunar Exploration Projects and manned lunar exploration.
The microwave landing radar provides the GNC (guidance, navigation and control) sub-system with the range and velocity relative to the Martian surface during the EDL (entry, descent, landing) phase, to ensure the safety for mars landing rover. Microwave landing radar adopts a linear frequency modulation continuous wave(LFCW) system and is equipped with four radar beams, each of which can measure range and velocity at the same time. Continuous wave radar has the characteristics of no blind range and high measurement accuracy. However, due to the leakage of transmission and receiving, the range will be limited, and the bottom of landing rover can cause multi-path problems and special sand and dust effect ,to the microwave landing radar system design brings many problems. In order to meet the requirements of far-range and highaccuracy, and be responsible for the range and velocity measurement in the mars environment, the microwave landing radar adopted high isolation system design and multi-path suppression algorithm, and carried out radar performance verification under various environments such as sand and dust, which effectively solved the problem of continuous wave radar and ensured the complete success of China's first mars exploration landing on the surface of mars.
Aiming at the problem of short-range high-speed bullet trajectory measurement under clutter background, a new signal processing method used for practical radar system is proposed. Firstly, an introduction of the high-speed bullet target detection system is described. Secondly, the high-speed moving target echo is derived and analyzed. Then the processing algorithm is presented, in which a parallel multi-channel search processing and an iterative high-speed target matching processing are designed. Finally, the effectiveness of the designed processing algorithm is verified using a ground experimental radar system.
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