Outline
GPS radiosonde is an upper-air sounding
instrument flying with weather balloon. As theballoon ascends, radiosonde measures variety ofmeteorological data; wind speed, wind direction,pressure, height, temperature and humidity.
Wind speed, wind direction and pressure arecalculated from the travel speed and altitude
obtained by GPS information. Temperature andhumidity data are obtained from dedicatedthermistor and electrostatic capacitance humidity
sensor, respectively. Measured data aretransmitted to ground receiving system every
second using 400-406 MHz band.
Redesigned sensor boom achieves higher
accuracy in temperature measurement. Also,
newly developed high response humidity sensor
enables more accurate humidity measurement
even in low temperature environment.
RS-11G enables various kinds of soundings
through expansive interfaces, such as MTR (16Hz temperature sampling), CFH (Cryogenic
Frostpoint Hygrometer), Radioactivity sonde,
ECC Ozone sonde, Cloud Particles Sensor(CPS), etc.

Features:● Improved temperature and humidity sensor with highaccuracy for upper-air sounding● Redesigned rain-resistant cap for humidity sensor
improves more accurate humidity measurement even inlow temperature environment.
● One lithium battery enables more than 3 hours
sounding operation.
● Equipped with SBAS receiver
SBAS for GPS positioning improves measurement
performance.
● High stability transmitter complying with ETSI (EN302 054 V1.1.1)● Safe operation
Lightweight RS-11G (85g: Including a battery)enhancing safety with reduced risk of accident when it
falls down.
● A/D 5ch and serial port supporting various special
sensors; ECC, CFH, MTR, CPS, etc.
● Capable of using ground receiver RD-08AC andsounding software MGPS-R

No. MSPA4-033

Block Diagrams

Specifications
Measurement range -90℃ to +60℃

Temperature

Resolution

0.1℃

Uncertainty *(a)Daytime0.5℃: Troposphere
0.8℃: StratosphereNighttime
0.4℃: Troposphere
0.4℃: StratosphereResponse time

Center freq.
Tuning range *Transmitter< 0.4 s（1,000 hPa, 5 m/s）

Measurement range 0%RH to 100%RH

Humidity

Resolution

0.1%RH

Uncertainty *(b)5%RH: Lower Troposhere
7%RH: Upper Troposhere

Response time

< 0.2 s (Absorbing, 1,000 hPa, 6 m/s , 0℃)< 14 s (Absorbing, 1,000 hPa, 6 m/s, 60℃)

Modulation

Power

Measurement range 1050.0 hPa to 3.0 hPa

Pressure *1

Resolution
Uncertainty *(c)0.1 hPa
1.2 hPa: Surface
0.5 hPa: 15 km
0.2 hPa: 30 km

WindDirection *1

0.1 m
11 m

Measurement range 0 deg to 359.9 deg
Resolution

0.01 deg

Uncertainty *(d)2 degMeasurement range 0.00 m/s to 200.0 m/s

WindSpeed *1

GPS ReceiverSize & Weight *3

Resolution

0.01 m/s

Uncertainty

2 m/s Troposphere
3 m/s Stratosphere

Frequency

1574.25 MHz ±1MHz

Number of channels

12 parallel channelsUsage
Environment

Pressure

1050.0 hPa to 3.0 hPa

Temperature-90℃ to +60℃

Humidity

0%RH to 100%RH< 15 kHz

Output power< 100 mW

Transmitter type

FMStandard

EN302 054 V1.1.1

Modulation type

Digital PCM

Baud rate

1,200 bps

Range

< 250 km (with Yagi antenna)

Sampling

1 sec. or 0.5 sec.

Voltage

3.0 VDC

Current< 240 mA

Battery type

Lithium battery ×１(CR-123)

Operating time> 200 min.
AD port × 5 channels
Serial port ×1 channel,

Dimensions

86(W)×67(D)×155(H) mm

Weight85 g (Including a battery)

Outline View86Positioning Technology DGPS (SBAS)

400 MHz to 406MHzBand widthI/F for
additional sensor(Optionnal)

Measurement range -500.0 m to 40,000.0 m

Geopotential
Height of signifi- Resolution
1
cant level *Uncertainty *(c)404.5 MHz
2

Unit (mm)67155Note*1) The accuracy of GPS positioning is dependent on the satellites’s location and thereception level.
*2) Frequency can be changed every 100 kHz within the tuning range of 400 MHz and406 MHz. Applicable Radio Law/Regulations should be complied.
*3) Dimensions excluding antenna and sensor boom. Weight includes a battery, etc.
Uncertainties are calculated on assumption that observation made under the ordinal
weather conditions in the mid-latitude region.
*a) Evaporative cooling effect emerging from a cloud is not considered.
*b) Contamination due to rainy condition is not regarded.
*c) Under optimal conditions of GPS reception: PDOP=1*d) Conditions under moderate wind: <5 m/s are not calculated.

Cautions● For safe and correct usage, please read the "Operation Manual" prior to the use of the products.
● The specifications and appearances might be changed without prior notice, which please understand.
● The specifications shown in the catalog are of our standard products. We are pleased to customize it to meet customer's requirements. For the details, pleasecontact us.
● Please understand in advance that our company cannot assume the responsibility of any claims made by the third party about any monetary damages or any

loss of profits arising out from the use of our products.
● The color of the product photography on catalog might be different from that of actual product because of printing.

1-1, Toyosu 3-chome,Koto-ku, Tokyo 135-8115, Japan
Tel: +81-3-6204-8254 Fax: +81-3-6204-8888
Mail: global@meisei.co.jp http://www.meisei.jp/sonde/
Global Marketing Gr.
The specifications this catalog are current as of September 2018.

No. MSPA4-033