The high-precision navigation of the remote sensing instruments onboard FengYun-4 (FY-4) geostationary meteoro-logical satellite is the basis for instrument calibration, product retrieval, and quantitative application. The geosynchronous interfero-metric infrared sounder (GIIRS) onboard FY-4 satellite, the new generation geostationary meteorological satellite in China, is the first hyperspectral vertical detector operating in the geostationary orbit in the world. In the process of hyperspectral detection, it is key to keep the "resident" observation target stable with high precision. The FY-4 satellite uses an advanced three-axis stable attitude control platform, which brings great flexibility to earth observation and great challenges to the high-precision navigation of the GIIRS. The stability of the high-precision observation target requires the cooperation of satellite platform, attitude control, the instru-ment and the ground system, which process is very complicated. Based on the introduction of the detection principle and working mode design of the GIIRS, the key technology of satellite-ground integrated navigation is researched. The resident accuracy as well as the navigation accuracy are tested and analyzed using the measured data from the GIIRS in orbit. The results show that the GIIRS achieves a resident accuracy of 1/10 pixel and a navigation accuracy of 1 pixel, laying a good foundation for quantitative applications including numerical weather prediction.

Clouds and precipitation are vital to the global water and energy cycle and act as crucial elements in maintaining the Earth's energy balance. Spaceborne cloud and precipitation radars can actively detect clouds and precipitation and obtain three-dimensional structural information of cloud and precipitation globally all day and night,effectively filling the shortcomings of pas-sive detection by meteorological satellites. Firstly, the demand analysis is conducted on spaceborne cloud and precipitation radars,summarizing the shortcomings of cloud and precipitation detection capabilities of current Chinese meteorological satellites. Then,the development status of spaceborne cloud and precipitation radars at home and abroad is introduced, and the problems that China's spaceborne cloud and precipitation radars need to be solved are summarized. Finally, we give the main direction of the development of spaceborne cloud and precipitation radars in China in the future.

DRO orbit in cislunar space is a kind of periodic orbit with great value and mission potential. The scientific exploration satellite on DRO orbit has the requirement of timely down-transmission of critical buret data of scientific payload and global coverage of measurement and control management. This paper analyzes the basic capability of BDS-3 global short message. The cis-lunar space TT&C data transmission scheme and TT&C data transmission process are designed based on the BDS-3 global short message, and the key technologies are analyzed. The research and analysis show that the cislunar space TI&C data transmission scheme based on the BDS-3 global short message can make up for the gap of ground-based TT&C, and realize the low-cost TT&C data transmission in all weather and all day.

Integrated circuit nanotechnology is gradually approaching the physical limit. Therefore, relying on heterogeneous integration technology to continue and expand Moore Law is becoming increasingly important. The vertical interconnection of signals from various integrated chips is achieved through technologies such as through silicon via (TSV) or through glass via (TGV), while high-density interconnection in the horizontal direction can be achieved through rewiring layer (RDL) technology. The article summarizes the comparison between TGV technology and adapter boards, elaborates on the current application status in the field of passive systems and RF 3D integration, analyzes the TGV process capability and the current technical progress of domestic and foreign manufacturers, and explores the existing technical difficulties and future development trends of the TGV.

With the continuous progress of satellite internet and China's aerospace TT&C technology, aerospace TT&C networks are developing towards intelligence and integration, making great progress in autonomous TT&C, resource allocation, and other aspects. Therefore, establishing an intelligent space-ground integrated network is an important goal for the future development of China's aerospace industry. In this paper, the relevant principles and technologies of tracking orbit, telemetry, and telecommand in intelligent space TT&C network are introduced. At the same time, combined with the space data link standard protocol proposed by CCSDS, TM, TC, AOS, Proximity-1, and USLP standards are introduced in detail, and the technology and practical application of different standards are analyzed. This paper introduces the working principle and technical requirements of space TT&C system from the view of the data link layer and physical layer, and provides reference and prospects for the research of the intelligent space-ground integrated satellite TT&C communication network in China.

The optical phased array controls the emission beam by adjusting the phase of the array antenna to change the wave-front, thus achieving control over the emission beam. Optical phased array technology has great potential applications in areas such as laser radar, laser communication, high-brightness laser generation, and synthetic aperture detection. This article reviews the re-search progress, advantages, and disadvantages of liquid crystal phased arrays, micro-electro-mechanical system phased arrays, and optical waveguide phased arrays. It also delves into the optical waveguide phased array technology in laser radar, proposing break-through directions for this technology.

The paper provides a brief overview of the development of terahertz technology and its advantages in various appli-cation scenarios, including high resolution and strong anti-stealth characteristics in radar. Regarding terahertz atmospheric transmis-sion characteristics, the paper focuses on the basic principles of the MPM and provides an overview and comparison of mainstream atmospheric transmission models like the ATM model and AM model. At the same time, this paper also introduces recent research developments and progress on terahertz atmospheric transmission characteristics domestically and internationally. Finally, this paper summarizes the development of terahertz technology and offers prospects for its applications.

The Surface Water and Ocean Topography (SWOT) satellite is a new generation ocean observation satellite. It is used to provide a new method for wave detection by adopting the synthetic aperture radar (SAR) observation system at a small inci-dence angle. Based on previous studies on SAR wave spectrum inversion, the applicability of the wave spectrum inversion algorithm for SWOT satellite data is studied. The effects of wind speed, wind direction, and main wave direction on wave spectrum inversion are discussed. The effective wave height of the inversion is verified using the ERA5 dataset from the European Center for Mediumrange Weather Forecasts (ECMWF). The results show that the root mean square errors (RMSE) of the effective wave height inver-sion are 0.30 m, 0.19 m, and 0.64 m at wind speeds of 7-9 m/s, 9-11 m/s, and >11 m/s, respectively. The scatter indices (SI) are 16.74%, 7.03%, and 19.61%, respectively. It can be proven that the SWOT satellite, as a small incidence angle SAR, has the poten-tial to invert wave spectra and wave parameters.

From March 27-29, 2021, a large-scale and prolonged dust pollution event occurred in the north of China. This study analyzed the optical properties, vertical distribution, and transport patterns of dust aerosols using data from MODIS and ground-based lidar (AMPLE-001), combined with the HYSPLIT model. Additionally, hourly data from the China Environmental Monitoring Station and aerosol optical depth (AOD) data from MCD19A2 and AERONET were used to verify the accuracy of the ground-based lidar measurements. The key findings are as follows: ① The dust was primarily transported at an altitude of 4 km over the northern Gobi Desert, and mixed with local pollutants and then settled. ② During the dust event, particulate matter concentrations surged dra-matically. PM₁₀ concentrations peaked at over 2 492.65 μg/m³, while PM_2.5 reached a maximum of 236.48 μg/m³. The highest record-ed AOD was 4.1, with dust pollution being most severe in the southern and eastern parts of Beijing, Tianjin, and Hebei. ③ In terms of accuracy validation, comparisons between AOD values from sun photometers and lidar showed a strong correlation, with a corre-lation coefficient of 95.63%. Similarly, the PM₁₀ and PM_2.5 data from ground-based lidar were highly consistent with official monitor-ing data, with correlation coefficients of 85.93% and 98.47%, respectively. These results validate the detection capability and accura-cy of the AMPLE-001 ground-based lidar system.

Considering the wide application and critical importance of satellite navigation systems, aiming at the requirements for precision and reliability of the next-generation BeiDou satellite navigation system, this study investigates the current development status of integrity technology from four dimensions: basic integrity of satellite navigation systems, integrity of satellite-based augmentation systems (SBAS), advanced receiver autonomous integrity monitoring (ARAIM), and precise point positioning (PPP)integrity, and compares the technical difficulties of each. Finally, it explores the development trends of future integrity technologies. This study is significant for the design and construction of the integrity system of the next-generation BeiDou satellite navigation system.