# Data Analysis of the TK-1G Sounding Rocket Installed with a Satellite Navigation System
## 1 Introduction  
The study of near space atmosphere is one of the frontiers of scientific research. The near space atmosphere is the exact path through which some aircrafts lift off and fly. In particular, the stratosphere and mesosphere region serve as the active area for airplanes, airships, and aerostats; also, the meteorological conditions of this region will exert a great impact on the flight safety of the aircrafts. Therefore, the detection of the near space atmosphere promises accurate and effective data on weather forecasts in the region and is of vital importance to the study of the near space atmosphere and flying safety of the aircrafts. A variety of ways have been tried like sounding balloons, radars, rockets, and occultation techniques in an attempt to study the characteristics of the near space atmosphere [1; 2; 3; 4]. Although meteorological elements below 30 km can be detected by using sounding balloons, it is out of their reach when that height is between 30 km to 100 km, and occultation or radars are incapable of in-situ detection [5; 6; 7]. In that sense, sounding rockets serve as the main tool for accurate in-situ measurement of the atmosphere of that height.  
Since 1945 when the first one was launched, various kinds of sounding rockets have appeared, such as America's famous SCIFER-2 (Sounding of the Cleft Ion Fountain Energization Region) sounding rocket [8], Japan's S-310, S-520, and SS-520 series of sounding rockets [9], Europe's REXUS (Rocket Experiments for University Students) series of sounding rocket, and so on [10]. In order to acquire various sounding data, the sounding rocket tends to carry different sondes, such as TOTAL (stands for total number density), CONE (Combined sensor for Neutrals and Electrons), and the recently used LITOS (Leibniz-Institute Turbulence Observations in the Stratosphere) [11; 12; 13; 14]. Through the processing of the rocket sounding data, numerous studies can be done. For example, with the use of the sounding data, [PERSON] et al. [15] analyzed the plasma's density; [PERSON] et al. [16] did research on the dynamics and energetics of the lower thermosphere; and [PERSON] et al. [17] measured the concentration of the atomic oxygen in the atmosphere. In addition, the rocket sounding data has oftenbeen synthesized and compared with the data acquired by other means. [PERSON] et al. [18] compared the radar-measured result of the middle atmospheric turbulence with rocketsonde-measured result separately; [PERSON] et al. [19] compared the sounding rocket data with the experience prediction model and estimated the accuracy of the rocket sounding data.  
However, China lags far behind the developed countries like the United States in the use of rockets for near-space detection due to its technological and financial constraints [19; 20]. Thus, studies in this field are relatively scarce and defective. In the study of [PERSON] et al. [3], they analyzed the data garnered by China's sounding rockets launched in 2004, but the rockets used to employ a traditional method of weather radar positioning to locate sondes. The wind speed obtained in this way thus differs sharply from that of the reference model (average about 6-8 m/s). The differences doubled in the upper stratosphere. As part of our efforts to bridge the gap in this regard, an flight experiment has been carried out on the latest model TK-1G sounding rocket with the satellite navigation system, and the accurate measurement of the meteorological elements has been realized at a height of 20-60 km (the height involved in this article refers to the height from the ground, unless otherwise specified), which is a step forward towards the improvement of the meteorological detection of near space.  
The organization of the rest of this paper is as follows. The overview of the test is described in Section 2. The description of the data validity rate in the detection is given in Section 3. The data processing and analysis are presented in Section 4, and the conclusions are given in Section 5.