Moderator

 

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Top Layer on pc signal in indoor condition

10003964_10203677301477059_1820218844_n.jpg First prototype bottom layer

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Signal in outdoor condition

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Position of satellite.

VR GPS Ublox Lea 6H with HMC5983 Magnetometer

 

First Virtualrobotix GPS engine using Ublox LEA-6H receiver.

This is a 50-channel high sensitive engine that boasts a Time-To-First-Fix (TTFF) of less than 1 second.

Also provide a rechargeable backup battery to improve warm start.

The dedicated acquisition engine, with over 2 million correlators, is capable of massive parallel time/frequency space searches, enabling it to find satellites instantly.

Innovative design and technology suppresses interference sources and mitigates multipath effects, giving LEA-6H GPS receivers excellent navigation performance even in the most challenging environments.

We are testing also new module NEO 7 and NEO M8 for evaluate how is better module for our drone.

Virtualrobotix GPS uses an high efficient low noise amplifier to improve antenna signal (19dB) and a SAW filter to select GPS frequencies (see graph below).

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In our test we are test different kind of saw filter for improve the quality of gps in presence of RF noise from cpu of other device as Action Camera , in our test for example GOPRO Hero 3+ RF emission is very high and is important to have a good filter for limit the gps glitch.

It also mounting an ultimate 3-axis digital compass, with selectable interface SPI or I2C (HMC5983).

This one is an high speed (220Hz output) and high resolution (2 milli-gauss) magnetometer.

 

Features and Specifications:

  • ublox LEA-6H module

  • 3,3V or 5V Inputs, with low noise 3.3V regulator.

  • 5 Hz update rate

  • Rechargeable 3V lithium backup battery for high efficient warm start

  • Panasonic Low Noise Amplifier for antenna signal with high gain (19dB)

  • EPCOS SAW high quality low-loss RF filter for GPS application

  • 25 x 25 x 4 mm ceramic patch antenna

  • Dedicated I2C EEPROM for receiver configuration storage

  • High resolution compass (2 milli-gauss) and high speed (2 milli-gauss)

  • Power and fix indicator LEDs

  • ArduPilot Mega compatible 6-pin JST connector

  • Exposed pads for simple soldering connection.

  • I2c / SPI HMC5983 magnetometer .
  • 2 ttl tx-rx ser connection.
  • 38 x 38 x 8.5 mm total size, 18 grams.

 

Some example from log collected in first test VRX GPS is red Line 3DR is blu

 

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The module will be available in may , for more info of pre order contact us at

info@virtualrobotix.com

 

http://www.virtualrobotix.it/index.php/en/shop/accessories/3dr-gps-ublox-lea-6-30-37-detail

 

Origina blog post :

http://www.virtualrobotix.com/profiles/blogs/vr-gps-ublox-lea-6h-with-hmc5983-is-coming

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Comments

  • @Roberto
    That what I meant- it costs more but you get more ;)
    You say that VRbrain 5.0  is going in production, and you still don't have a price? ;) Give us something, please:)

  • thanks roberto :)

  • Moderator

    http://www.epcos.com/inf/40/ds/ae/B3521.pdf

    This is the component choose for first prototype check the wide band transfer funciton .. you can see that cut all the low frequency very well .

    On that frequency we have telemetry 400 - 900 , 1200 video tx on the 2.4 ghz we have cut around 50 db that could be good ... i try to put near the antenna the gopro wifi and don't see big rf noise the gps mantain the lock ... going around a bit but not to much.

    Best

    Roberto  

  • hey roberto

    could you say us exactly what is the ref about the saw filter to see more spec about it

    http://www.epcos.com/epcos-en

  • Moderator

    @Luc,

    the main advantages at the moment is the HMC5983 instead of HMC5883 , that is evolution of HMC5883 available on 3DR GPS and a good band pass filter .

    About power plane we are evaluate some update as told to Bill .

    @Hein , yes lower multipath and minus hdop , we doing some comparative test with 3DR GPS and in some case we have +1 sat respect of 3DR GPS. 

    I don't know exactly if our preamp have more gain or is better power plan but i see this difference .. i spoke with Tridge about another test that i think to do next  week on acceleration 

  • Moderator

    @Bill,

    i agree with you about power plane ... we are evaluate to put on antenna some point for solder add power plane as this one : Groundplane-for-GPS_b2.jpg

  • 100KM
    Advantage is much faster lock, much lower hdop because of reduced multipathing etc?
  • I do not see any evident advantage  in using this module over the 3DR GPS module apart having a more exotic component in your mulirotor.

  • Developer

    Other than compatibility with the 3DR module, why use 38mm square ground plane? The data sheet for that antenna uses (25mmx25mmx4mm) uses a 50mm square ground plane. see http://www.taoglas.com/images/product_images/original_images/GP.157...

  • Moderator

    @Linus, 

    we are waiting sample for M8 module it is very good device we hope to check it before the end of this month ...

    Best

    Roberto 

This reply was deleted.