Gpsonde m2k2 wmo code 56
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ET-UASI Geneva – 17-20 March 2004. GPSonde M2K2 (WMO Code 56). Patrick CHARPENTIER - Rémy PEPIN MODEM - France. Design.

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GPSonde M2K2 (WMO Code 56)

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Gpsonde m2k2 wmo code 56

ET-UASI

Geneva – 17-20 March 2004

GPSonde M2K2 (WMO Code 56)

Patrick CHARPENTIER - Rémy PEPIN

MODEM - France


Design

Design

M2K2 GPSonde (WMO code  : 56) is an updated version of the former GL98 GPSonde. The technology is similar as well and M2K2 design has been conducted in accordance with the following guide lines :

  • Research of technical solutions allowing cost reduction

    • Optimization of electronic design

    • Reduction of power consomption (4 dry-cells instead of 8)

    • Reduction of size and weight

  • Improvement of general performances

    • More powerfull microprocessor

    • 3 entries for connection of additionnal sensors without interface

    • Optional buit-in pressure sensor

  • Avoid any fundamenal change in respect to T and U sensors

    • New design of sensor boom to prevent eventualdamage during handling


General features

General features

  • M2K2 GPSonde hold on general specifications from previous GL98 :

    • 3D GPS board: Position with latitude, longitude et altitude

    • Transmitter: 400-406 MHz synthetizer

      Digital data transmission

      Narrow bandwidth

      Max drift ±2 KHz

      200 KHz step frequency setting

    • Power supply: 4 dry cells

      : Autonomy > 3 h

    • Factory calibration: Stored on EEPROM


New specifications

New specifications

  • Physical features

    • Weight: 210g

    • Dimensions: 92 x 107 x 160 mm

  • Electronics optimization

    • All functionalities (Transmitter, GPS, microprocessor…) are implemented on an unique electronic board

  • High performance microprocessor

    • Reprogrammable,

    • 3 entries for additional sensors (Ozone, Snow-White,…). No interface needed for connection

    • Noise reduction on temperature measurements


Gpsonde m2k2 wmo code 56

  • New generation 3D GPS board

    • Short initialization time

  • Power supply

    • Significative reduction of energy comsomption

    • 4-battery pack

  • Optional pressure sensor

    • On standard version, pressure is calculated from GPS altitude. M2K2-P version is delivered with a pressure transducer. In this case, both calculated and measured pressures will be available.


New boom design

New boom design

  • The new boom has an additonnal end leg in order to better preserve the balloon in case of impact with it.

    (New design is presented on the left side).


T emperature sensor

Temperature sensor

  • Temperature sensor consists in a thermistor chip wrapped into a glass ball. Its tiny size (0,9 x 2 mm) allows excellent response time around 1 to 1,3 sec. Temperature sensor is led on a layer processed against humidity and solar radiations.

  • Boom end is painted with a special white coating to reduce solar radiation effects.


Temperature sensor details

Temperature sensor details


Humidity sensor

Humidity sensor

  • Humidity sensor consists in a capacitor of which value is directly proportional to relative humidity. It is composed of 3 primary components :

    • Basic layer as an electrode

    • A dielectric of which characteristics vary along relative humidity

    • A short response porous electrode as the second electrode of the capacitor

  • A cap is protecting the sensor from rain and mechanical damage


  • Humidity sensor improvement

    Humidity sensor improvement

    • Humidity sensor size is larger in order to improve response time.

    • Former sensor was connected to the boom through a thin thread. In order to reduce risk of dammage, sensor is now fitted like a surface mounted component with a metallic hole in its center.


    Gpsonde m2k2 wmo code 56

    P

    S

    S

    I

    • Original dual-face concept

    • Hight accuracy

    • High Haute reliability

    • Tiny sensor

    • 0% to 100% range

    • Short response


    Sensor specifications

    Sensor specifications

    TEMPERATURE HUMIDITY

    • Sensor type: Thermistance !Capacité

    • Measurement range: +50° to –90° !0% to 100%

    • Resolution: 0.1°C !0.1%

    • Absolute accuracy: +/- 0.5°C !+/-5%

    • Response time: <2s !<2s

    • Measurement rate: 1 Hz ! 1 Hz

    • Factory calibration: Stored on EPROM

    • Calibration prior launch: Ground check system


    Gps specifications

    GPS specifications

    GPS WINDFINDING

    • General: DGPS with unlimited altitude - C/A

    • Position accuracy: 10 m

    • Horiz. speed accuracy: 0.15 m/s

    • Wind dir. accuracy: 2 °

    • Position: 0.01 m

    • Horiz. speed resolution: 0.01 m/s

    • Direction resolution : 0.1 °

    • Measurement rate: 1 Hz

      PRESSURE

    • Range : 1050 to 3 hPa

    • Accuracy: ±2 hPa at 1050 hPa; ±0.5 hPa at 10 hPa

    • Resolution: 1 hPa at 1050 hPa; 0.1 hPa at 20hPa


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