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Topic: Satellite Comunications (Read 3095 times) previous topic - next topic

BigusDickus

Hi,

I've worked on a number of arduino projects that involve tracking balloons/planes/boats. So far I've always used a GSM modem to send data in the form of SMS messages.

The catch is that above a few hundred feet, or out-of sight of the shore the modem stops working for obvious reasons. The solution seems to be to  use a satellite modem. I've seen solutions in the past that are based on hardware-hacking of old satellite phones, but even this seems to involve expensive hardware, long contracts and expensive data rates. Just buying an iridium modem seems to be impossible, they only seem interested in selling large quantities at high prices with long contracts

I've come across this recently.....
http://rockblock.rock7mobile.com/
This seems to tick most of boxes, the modem is about £160, the subscription is £8 a month and it's 12 pence for 50 characters.

My questions are...
Has anyone used this with an arduino? if so any problems?
Is anyone aware of any similar or better options?

Cheers

PeterH

I'm not involved with it, but I understand that the UK High Altitude Society have a free collaborative radio tracking solution which might conceivably work for you. Otherwise, the conventional solution seems to be some sort of ham radio based system. I'm not surprised that satellite phone based solutions are expensive - it needs specialist hardware and the price you quoted seems quite a lot cheaper than I remember from Inmarsat.
I only provide help via the forum - please do not contact me for private consultancy.

BigusDickus

Quote
price you quoted seems quite a lot cheaper than I remember from Inmarsat.

That's what I thought! It's partly the reason for the post, I was hoping someone might have already used it and could advise on it's viability.

Thanks

sonnyyu

from home page
Quote
Hello World
RockBLOCK can send and receive short messages from anywhere on Earth with a view of the sky.
Compatible with Windows, Mac and Linux computers (including Raspberry PI™) and many other platforms with USB or serial ports.


Plan A. use Raspberry PI as shield connect with box, and connect Raspberry PI via USB to Arduino.

sonnyyu

#4
Apr 08, 2013, 06:00 am Last Edit: Apr 08, 2013, 06:02 am by sonnyyu Reason: 1
Quote
So far I've always used a GSM modem to send data in the form of SMS messages.


GSM modem -> 2G technologies

plan B.  upgrade it to 4G Wimax, 30 to 40 megabit-per-second data rates, and 34 mb seem is  the standard. Operating at the maximum range of 50 km (31 mi).  to make 4G Wimax  working with Arduino  is easy. use Raspberry PI as shield connect with Wimax USB stick, and connect Raspberry PI via USB to Arduino. It works for me.

Now we have big problem, Did we have enough data, 10mb/s  to transfer?


Magician

http://globalstar.com/en/?rls=1

BigusDickus

Quote
plan B.  upgrade it to 4G Wimax

Does 4g Wimax work at a greater altitude than 2g? that's the underlying issue. The only reason I'm considering going to satellite is that I know it will work at almost any altitude.

Regards

Hi

Just to let you know, I work for Rock7 (who make the RockBLOCK) - happy to answer any questions you might have.

We have quite a few people using RockBLOCKs in high-altitude projects, seems to be quite a good application for the unit, and by all the reports and photos I have seen people are happy with it.

RudiAhlers

I need to send data from an Arduino data logger to remote SQL server, from remote places with little or no GSM / GPRS signal. Has anyone done something like this, successfully? The monitoring will be done in Africa though.

sonnyyu

#9
Jun 17, 2013, 05:25 pm Last Edit: Jun 17, 2013, 05:33 pm by sonnyyu Reason: 1

sonnyyu

#10
Jun 17, 2013, 05:32 pm Last Edit: Jun 17, 2013, 05:36 pm by sonnyyu Reason: 1

I need to send data from an Arduino data logger to remote SQL server, ...


I did one mini concept proof Arduino data logger project a while ago, which use remote NoSQL server.
NoSQL give a way better speed, scalable, hardware requirement than SQL server.

Use NoSQL might help you get rise as well.  :P

sonnyyu


Quote
plan B.  upgrade it to 4G Wimax

Does 4g Wimax work at a greater altitude than 2g? that's the underlying issue. The only reason I'm considering going to satellite is that I know it will work at almost any altitude.

Regards


No.

RudiAhlers



I need to send data from an Arduino data logger to remote SQL server, ...


I did one mini concept proof Arduino data logger project a while ago, which use remote NoSQL server.
NoSQL give a way better speed, scalable, hardware requirement than SQL server.

Use NoSQL might help you get rise as well.  :P

We already have a PHP + MySQL application for our purposes and I just need to get the data to the server, reliably.

sbright33

He did it!  Works great!  Rockblock Library for Arduino:

http://arduiniana.org/libraries/iridiumsbd/
If you fall... I'll be there for you!
-Floor

Skype Brighteyes3333
(262) 696-9619

JonnyRadu

Just use a radio modem in 400 Mhz band UHF , with FSK or QFSK modulation or other, you do not get the high data rate like the modem but with a power amplifier of 6 to 10 W and a directive high gain antenna you cold receive the data with no problem from space. Of course you shod have a transceiver or the proper equipment, antenna, etc at the receiving side. See APRS ISS transmission from space for reference.
Also there are radio repeater satellites for HAM radio use if you can send data threw thous. Up link in VHF and Down link in UHF and so on. 

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