Simulation Study on GRO and LRO Events
Shuzhi WANGCongliang LIUGuangwu ZHUWeihua BaiQifei DUYueqiang SunJunming XiaXiangguang MengXianyi WangDanyang ZhaoDongwei WangYuerong CaiDi Wu
3
Citation
8
Reference
10
Related Paper
Citation Trend
Abstract:
GRO(Global Navigation Satellite System Radio Occultation)和LRO(Low Earth Orbit Radio Occultation)联合组网探测地球大气是无线电掩星探测技术的主要发展方向.本文根据掩星事件的数学判据,仿真分析了LEO卫星主要轨道参数对GRO和LRO掩星事件数量和全球分布情况的影响.研究表明:卫星轨道越低GRO掩星事件越多;轨道倾角在30°和75°之间时,GRO掩星事件较多,全球覆盖率也较大;利用极轨卫星进行LRO掩星探测时,LRO掩星事件较均匀地分布在各纬度带.研究成果对GRO和LRO联合星座设计具有参考价值.Keywords:
Occultation
Radio occultation
Orbit (dynamics)
Radio occultation
Ionosonde
Occultation
Cite
Citations (6)
Radio occultation
Occultation
Atmospheric wave
Cite
Citations (45)
Abstract The Mars Express Radio Science (MaRS) experiment on board Mars Express has been providing radio‐occultation data since early 2004. The analysis method currently used to retrieve neutral atmosphere and ionosphere profiles is based on the resolution of a complex inverse problem. The solution to such a problem is obtained under strong assumptions on the atmosphere and the ionosphere and with some limitations. Here we developed a novel method for radio‐occultation data analysis based on a direct approach which overcomes some of the difficulties related to the standard inversion. This new method is based on a numerical model of the atmosphere and the ionosphere of Mars computing the propagation of the radio waves from the spacecraft to the receiver on Earth. The main interest of such an approach lies in the intrinsic and coherent coupling between the neutral part and the ionized part of the planetary environment, which gives physical constrains on the retrieved profiles. We have applied this new method to radio occultation experiments performed by MaRS, and we present the results obtained in two different occultation configurations. We discuss the differences which emerge from the standard analysis and the gain that such a method can give to the analysis of planetary environments.
Radio occultation
Occultation
Radio Science
Planetary science
Cite
Citations (8)
Radio occultation
Occultation
Cite
Citations (1)
Radio occultation
Occultation
Atmospheric Infrared Sounder
Cite
Citations (1)
The small/micro satellites equipped with spaceborne GPS receivers have been proved suitable platform for GPS radio occultation observation, as they can form a cheap network for global atmosphere observation. The quality of GPS radio occultation observation varies with the orbit chosen for the LEO satellite. As a result, the impact of the orbit on the observation quality should be studied. For this purpose, this paper develops an occultation events simulation system, in which positions of small/micro observation satellite and GPS satellites at different time are calculated by SGP4 model and SDP4 model, and then a Matlab program deals with these positions, judges the occurrence of occultation events, taking the field of view of the GPS antenna into account, calculates the longitude and latitude of the spot and also the duration of the occultation events, based on which distribution pictures can be drawn. With the system, two topics have been discussed: simulation for satellites with different orbit parameters, and the impact of each parameter on the number and distribution of occultation events. With these rules, the optimized orbits for global GPS radio occultation observation or observation of a certain region can be designed.
Occultation
Radio occultation
Orbit (dynamics)
Longitude
Orbit Determination
Cite
Citations (1)
Abstract Mountain‐based GPS radio occultation observations were conducted at Yaogu mountain top and Jiugong mountain top in Hubei province respectively. Occultation events data were successfully obtained. Analysis and statistics of the occultation events have been completed. Principle and methods estimating bending angles of the radio rays and atmospheric refractivity profiles with the mountain‐based radio occultation data are given. The simulation data of mountain‐based occultation events are used for testing the inversion method. Testing results show the inversion method is efficient. The atmospheric refractivity profiles below the height of the GPS receiver are obtained with this inversion technique, as well as the bending angle of rays. Results suggest that the mountain‐based radio occultation technique is a potential new technique monitoring the lower atmospheric environments.
Radio occultation
Occultation
Inverse transform sampling
Cite
Citations (5)
Radio occultation
Occultation
Cite
Citations (8)
Mountain-based GPS radio occultation observations were conducted at the Yaogu mountain and Jiugong mountain in Hubei province, respectively. Occultation event data were successfully obtained. Analysis and statistics of the occultation events have been completed. The principle and methods estimating bending angles of the radio rays and atmospheric refractivity profiles with the mountain-based radio occultation data are given. The simulation data of mountain-based occultation events are used for testing the inversion method. Testing results show that the inversion method is efficient. The atmospheric refractivity profiles below the height of the GPS receiver are obtained with this inversion technique, as well as the bending angle of rays. The results suggest that the mountain-based occultation technique is a potential new method for monitoring lower atmospheric environments.
Radio occultation
Occultation
Inverse transform sampling
Cite
Citations (3)
In this paper, the mountain-based radio occultation is simulated using the 3D ray tracing technique. The starting time, the azimuth angle and the duration of the occultation events are obtained. The height and the excess phase variations of the occultation caused by water vapor and the temperature variety in the atmosphere boundary layer are studied in details. The influence of the geography on the height of the occultation is analyzed using data observed by CHAMP occultation, and it is very obvious. These results may be significant for explaining occulted processing, signal block and the height variation when the occulted signals' tangent height enters the atmospheric boundary layer.
Occultation
Radio occultation
Cite
Citations (0)