Hi Claude,

What sort of an environment will you be doing your research in, if you don't mind recapturing them again you could try using micro coded wire tags? 

Hopefully that might be of some help to you and all the best with it.

Matt

Hi, you should explore (harmonic radar, Schottky diode 917 y 1834 MHz), the bad things it's that you can't get and ID and the receiver that uses two antennas it's really expensive (U$.7000) or use a radar system with satellite dish that would be more expensive.

Hi Claude,

If you are looking into cord antennas, the attached paper might be of interest (the authors are all from CNRS, which might be easier for collaborations).  A difference would be that you might need a faster sampling rate (since penguins are much slower than small mammals and take more time to cross the array of antennas).

Do keep us updated on your project. 

Yvan

Hi Matt,

This is a very broad question. Short answer, probably not. Narrowing down your problem would help community members get better context. What's the species you're working with? In which country/region is this occuring? How many of the fish are there? What are the current technologies being used to catch the fish by the poachers? 

Hi Michael

I made some progress on a Java library and little GUI but I did not finish it. Although I managed the boring stuff, unpacking the DSG files and put some nifty magnetic calbration stuff in.

This is NOT a finished or functional product but it is open source, so if anyone wanted to finish it off, I'd be more than happy. I intend to do it eventually but at the back of the list opf things to do.

The application main class is here: It's integrated into a larger application but can be used as a standalone app. Good luck to anyone who wants to take it on- make sure any further work stays accessible and open please.

Cheers

Jamie

Hi, 

I have been involved in a variety of tracking projects over the last few years for the BTO, including the use of GPS-GSM tags we have been developing with university partners.

Firstly, I'd suggest that your colleague contact me or reply on this thread with a little more information, i.e. how small is small? Is there a known weight limit needed? Current of the shelf type tags designed for bird tracking will generally be 20g and higher but are unlikely to be suitable as they come as they usually are solar recharged. 

However, it would be very possible to assemble some lighter prototypes (i.e. we are currently working on a c.10g GSM tag) specifically for this application after a bit of consultation of requirements (which may influence housing, dimensions, battery size etc.).

These would need to be tested in conditions simulating their intended use as a very small tag may simply not have enough power to obtain fixes with lots of interference and last long as long as required. There is always a trade off with weight and performance.

Another key thing to consider would be the location these will be deployed and the likely GSM network coverage. Although tags would be able to log data and store it until it does come into coverage.

There are several manufacturers I know of who would likely be able to develop something for this project and it may just depend on exactly what is required and when as to who is in the best place to delivery some tags.

I look forward to hearing back, 

Gary Clewley

Research Ecologist, BTO

gary.clewley@bto.org

Hi there

Check out Microwave Telemetry at http://www.microwavetelemetry.com/bird/GSMspecifications.cfm

Sirtrack may also be worth checking out (though I'm not sure what GSM trackers they have).  http://www.sirtrack.co.nz/

Good luck and let us know how you go. We're always looking for lightweight, long-lasting (solar or movement-powered) GPS trackers... or even trackers using IoT and sensor networks...

cheers

Alan