Developing of Beidou Radiosonde System and Analysis on Its Wind Measuring Performance

Zhang Enhong; Cao Yunchang; Zhu Bin

Vol.24, NO.4, 2013

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Zhang Enhong, Cao Yunchang, Zhu Bin. Developing of beidou radiosonde system and analysis on its wind measuring performance. J Appl Meteor Sci, 2013, 24(4): 464-471.

Citation:

Zhang Enhong, Cao Yunchang, Zhu Bin. Developing of beidou radiosonde system and analysis on its wind measuring performance. J Appl Meteor Sci, 2013, 24(4): 464-471.

Zhang Enhong, Cao Yunchang, Zhu Bin. Developing of beidou radiosonde system and analysis on its wind measuring performance. J Appl Meteor Sci, 2013, 24(4): 464-471.

Citation:

Zhang Enhong, Cao Yunchang, Zhu Bin. Developing of beidou radiosonde system and analysis on its wind measuring performance. J Appl Meteor Sci, 2013, 24(4): 464-471.

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Developing of Beidou Radiosonde System and Analysis on Its Wind Measuring Performance

Zhang Enhong^1,2,3,
Cao Yunchang¹,
Zhu Bin^{2
,
,}

1.
Meteorological Observation Center of CMA, Beijing 100081
2.
Key Laboratory for Atmospheric Physics and Atmospheric Environment, Nanjing University of Information Science & Technology, Nanjing 210044
3.
Guangdong Provincial Meteorological Information Center, Guangzhou 510080

Received Date: 2013-01-31
Rev Recd Date: 2013-06-12
Publish Date: 2013-08-31

Abstract

Abstract

As an important constituent of the integrated meteorological observation system, the upper air meteorological observations have extremely important effects on weather forecast, climate change research and other work, and it plays an irreplaceable benchmark function in atmospheric remote sensing observation authenticity verification and calibration of testing. The development of Beidou radiosonde and the ground receiving system is based on Beidou Satellite Navigation System with completely independent intellectual property rights, and the prototypes are assembled. By the end of 2012, Beidou Satellite Navigation System can provide preliminary service with 14 satellites in orbit, including 5 Geostationary Earth Orbit (GEO) satellites, 4 Medium Earth Orbit (MEO) satellites and 5 Inclined Geosynchronous Satellite Orbit (IGSO) satellites in 3 inclined orbits. On this basis, Beidou radiosonde is examined, and comparative analysis are carried out on its different patterns of wind measuring, i.e., single Beidou, single GPS and mixed mode. The results show that the wind measuring performance of Beidou and GPS radiosonde is quite close. The deviation of Beidou radiosonde compared to the GPS radiosonde is as follows: The standard deviation of the north velocity is 0.05 m·s^-1, the average deviation is-0.05 m·s^-1, the standard deviation of the east velocity is 0.03 m·s^-1, the average deviation is-0.01 m·s^-1, the height standard deviation is 6.88 m and the average deviation is 7.48 m. The PDOP value in single Beidou mode is large compared to GPS radiosonde and the accuracy of positioning is poor, because the current constellation is not fully deployed. Beidou radiosonde performance is relatively stable in the lower atmosphere, but a violent wave happens in the high level atmosphere, which means that the stability of the national dual-mode chip and module needs improving.
- Beidou Satellite Navigation System;
- Beidou radiosonde system;
- Beidou radiosonde;
- wind measuring

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References(20)

Figures and Tables

图 1 北斗卫星导航系统星座示意图

(a) 部署完善后的北斗卫星导航系统星座^[6]，(b) 当前北斗卫星导航系统星下点轨迹^[7]

Fig. 1 Schematic diagram of Beidou Satellite Navigation System

(a) the constellation of Beidou Satellite Navigation System after the deployment to improve^[6]，(b) the ground track of the current Beidou Satellite Navigation System^[7]

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Fig. 2 The diagram of Beidou radiosonde structure (a) and the ground receiving system structure (b)

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Fig. 3 The trace comparison of Beidou radiosonde and GPS radiosonde

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Fig. 4 The change trend of the vertical location difference between Beidou radiosonde

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Fig. 5 The scatterplot of the horizontal positioning difference between Beidou radiosonde and GPS radiosonde

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Fig. 6 The speed comparison in the north (a) and east (b) directions between Beidou radiosonde and GPS radiosonde

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Fig. 7 The change trend of the difference of velocity measurements in north and east directions between Beidou radiosonde and GPS radiosonde

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Fig. 8 The change trend of the difference of velocity measurements in north and east directions between the single Beidou radiosonde and GPS radiosonde

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Fig. 9 The change trend of the difference of velocity measurements at specified level between Beidou radiosonde and GPS radiosonde

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Table 1 The performance index of CC50

参数	指标
水平位置精度	5 m
垂直位置精度	10 m
速度精度	0.1 m·s^-1
重捕获时间	≤1 s
平均热启动时间	1 s
平均冷启动时间	37 s
输入信号	GPS L1和BD2 B1
通道数	并行双32通道
定位输出速率	1 Hz
通讯端口	两个串口双向，LV-TTL电平

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Table 2 The performance index of Beidou radiosonde

参数技术指标	范围
探测距离	0~200 km
探测高度	0~36 km
温度测量范围	-90℃~50℃
温度最大静态测量误差	0.2℃
湿度测量范围	1%~100%(相对湿度)
湿度最大静态测量误差	3%(相对湿度)
气压测量范围5 hPa~1060 hPa(高度计算)	100 hPa~1060 hPa(传感器直接测量)
气压最大测量误差	1 hPa
风速测量范围	0~150 m·s^-1
风速最大测量误差	±0.3 m·s^-1
风向测量范围	0°~360°
风向最大测量误差	±3°(风速分量大于3 m·s^-1)
发射机频率范围	401~406 MHz
发射机发射功率	≤23 dBm
发射机发射谱宽	≤20 kHz(-50 dBc)
发射机频率稳定度	≤20 kHz(温差≤100℃)
天线频率范围	1567.75±9 MHz
天线增益	>3 dBi
天线极化方式	右旋极化

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Table 3 The comparison of three modules for the positioning precision in the static test

模式	CEP50/m	水平标准差/m	高度标准差/m	速度标准差/(m·s^-1)	平均PDOP
GPS	2.11	2.67	5.49	0.02	1.80
北斗	8.16	12.64	20.27	0.06	5.03
北斗与GPS混合	2.10	2.66	5.93	0.02	1.40
注：CEP50为圆概率误差。

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