A5002725289- Planetary Science and Exploration
- Geophysical Methods and Applications
- Astro and Planetary Science
- Space Science and Extraterrestrial Life
- Soil Moisture and Remote Sensing
- Microwave Imaging and Scattering Analysis
- Underwater Acoustics Research
- Coronary Artery Anomalies
- Seismic Waves and Analysis
- Non-Invasive Vital Sign Monitoring
- Ultra-Wideband Communications Technology
- Space exploration and regulation
- Radar Systems and Signal Processing
- Space Satellite Systems and Control
- Solar and Space Plasma Dynamics
- Cardiac Imaging and Diagnostics
- Vascular anomalies and interventions
- Methane Hydrates and Related Phenomena
- Turbomachinery Performance and Optimization
- Spacecraft Design and Technology
- Fluid Dynamics Simulations and Interactions
- Particle accelerators and beam dynamics
- Radio Astronomy Observations and Technology
- Microbial Inactivation Methods
- Advanced SAR Imaging Techniques
National Astronomical Observatories
2014-2024
Chinese Academy of Sciences
2014-2024
Tongren Hospital
2019-2024
Shanghai Jiao Tong University
2019-2024
China University of Petroleum, Beijing
2023-2024
Shanghai Advanced Research Institute
2023-2024
University of Chinese Academy of Sciences
2023-2024
Shandong Jiaotong University
2020
North China University of Technology
2017
Ohio University
2017
On 3 January 2019, China's Chang'E-4 (CE-4) successfully landed on the eastern floor of Von Kármán crater within South Pole-Aitken Basin, becoming first spacecraft in history to land Moon's farside. Here, we report observations made by Lunar Penetrating Radar (LPR) onboard Yutu-2 rover during two lunar days. We found a signal penetration at CE-4 landing site that is much greater than CE-3 site. The LPR images provide clear information about structure subsurface, which primarily low-loss,...
To improve our understanding of the formation and evolution Moon, one payloads onboard Chang'e-3 (CE-3) rover is Lunar Penetrating Radar (LPR). This investigation first attempt to explore lunar subsurface structure by using ground penetrating radar with high resolution. We have probed a depth several hundred meters LPR. In-orbit testing, data processing preliminary results are presented. These observations revealed configuration regolith where thickness varies from about 4 m 6 m. In...
This work presents the results of Lunar Regolith Penetrating Radar (LRPR), installed at bottom Chang'E-5 (CE-5) lander, which is first antenna-array radar deployed for investigation an extraterrestrial body. imaging unveiled a hyperfine structure top 2.5-m-thick lunar regolith with unprecedented high resolution 5 cm. The interpretation permitted to state that subsurface dominated by fine grains abundant rock fragments. were also used drive drilling process until fragment jammed core inlet...
The research on vital information extraction meets a lot challenges due to the narrow bandwidth and low signal-to-noise ratio of sign in real environment. In this paper, novel noncontract detection method based multiple higher order cumulant is presented. According characteristic for impulse ultrawideband radar, quasi-periodic reflected echo slow-time analyzed. theoretically deduced from fourth-order cumulant. It proved be better than reference fast Fourier transform by simulation...
Chang'e-3 (CE-3) has been the first spacecraft to soft land on moon since Soviet Union's Luna 24 in 1976. The arrived at Mare Imbrium December 14, 2013, and same day, Yutu lunar rover separated from lander start its exploration of surface subsurface around landing site. was equipped, among other instruments, with two penetrating radar systems having a working frequency 60 500 MHz. radars acquired data for about weeks while slowly moving along path 114 m. At navigation point N0209, got...
Lunar Penetrating Radar (LPR) onboard the rover that is part of Chang'e-3 (CE-3) mission was firstly utilized to obtain in situ measurements about geological structure on lunar surface and thickness regolith, which are key elements for studying evolutional history crust. Because penetration depth resolution LPR related scientific objectives this mission, a series ground-based experiments using carried out, results experimental data were obtained glacial area located northwest region China....
Accurate relative permittivity is essential to the further analysis of lunar regolith. The traditional hyperbola fitting method for estimation using penetrating radar generally ignored effect position and geometry antennas. This paper proposed a new approach considering antenna mounting height spacing in more detail. verified by numerical simulations regolith models. Hence calculated latest high-frequency image obtained Yutu-2 rover within first 24 days. simulation results show that...
The Rover-mounted Subsurface Penetrating Radar (RoSPR) is one of the scientific payloads onboard China’s first independent Mars exploration mission, Tianwen-1. radar aims to characterize thickness upper Martian soil and investigate subsurface stratigraphy by collecting processing data. This article mainly divided into two parts, introduction data pre-processing analysis pre-processed signals, aiming at helping scientists make more effective use part describes operating principle RoSPR...
Gas turbines operate under harsh conditions of high temperature and pressure for extended periods, inevitably experiencing performance degradation. Predicting the degradation trend gas optimizing planned maintenance cycles are crucial economic safety aspects turbine operation. In this study, a novel data-driven approach predicting is proposed. Initially, operating data augmented using mechanism model. Subsequently, model constructed based on support vector regression (SVR) operational...
Nowadays, asteroid and comet exploration is one of the most important components deep space exploration. Through missions, it possible to reveal history formation evolution solar system, understand origin planets, improve scientific models instruments. As a payload with advantages non-destructive, penetrating, polarizing characteristics, ground-penetrating radar (GPR) has been widely used in lunar Mars exploration, will play an role planned missions. In this study, statistics on results,...
Lunar Penetrating Radar (LPR) based on the time domain Ultra-Wideband (UWB) technique onboard China's Chang'e-3 (CE-3) rover, has goal of investigating lunar subsurface structure and detecting depth regolith. An inhomogeneous multi-layer microwave transfer inverse-model is established. The dielectric constant regolith, velocity propagation, reflection, refraction transmission at interfaces, resolution are discussed. model further used to numerically simulate analyze temporal variations in...
Abstract The lunar penetrating radar (LPR) onboard the Chinese Chang'e‐3 (CE‐3) mission obtained high‐resolution profile data for continuous ejecta deposits of Ziwei crater. Geological background suggests that contain few large boulders, and were largely originated from pre‐impact regolith. Using top ~50 ns data, we estimate bulk density porosity based on hyperbolic echo patterns in radargram are caused by subsurface boulders. physical properties close to those typical Numerous subparallel...
In recent decades, extensive research has led to the understanding that Mars once hosted substantial liquid-water reserves. While current Martian landscape boasts significant water-ice deposits at its North and South poles, elusive presence of bodies remained undetected. A breakthrough occurred with identification radar-echo reflections base Pole, using MARSIS (Mars Advanced Radar for Subsurface Ionospheric Sounding) in 2018. These radar echoes strongly suggest a highly concentrated body....
China's Mars probe including an orbiter and a landing rover will be launched by 2020. A subsurface penetrating radar (SPR) instrument has been selected to part of the payload on rover. The main scientific objective SPR is characterize thickness sub-layer distribution Martian soil. consists two channels. low frequency channel provide penetration depth 10 100 meters with resolution few within higher penetrate 3 centimeters first version prototype was designed some field tests have conducted it.
Lunar Penetrating Radar (LPR) has successfully been used to acquire a large amount of scientific data during its in-situ detection. The analysis penetrating depth can help determine whether the target is within effective detection range and contribute distinguishing useful echoes from noise. First, this study introduces two traditional methods, both based on radar transmission equation, calculate depth. only difference between methods that first method adopts system calibration parameters...
An anomalous origin of the right coronary artery from left sinus is usually characterized by an acute take-off angle. Most affected patients have no clinical symptoms; however, some decreased blood flow into during exercise, which can lead to symptoms such as myocardial ischemia. researchers who studied done so through cases. In this study, we used numerical simulation evaluate hemodynamics condition and effect angle on hemodynamic parameters. We expect that results study will help in...