# Mode S // DME // Classical SSR

**URL:** <https://www.ruby-forum.com/t/mode-s-dme-classical-ssr/186302>\
**Category:** GNU Radio\
**Created:** [April 4, 2010, 3:22am UTC](https://www.ruby-forum.com/t/mode-s-dme-classical-ssr/186302 "2010-04-04T03:22:00Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![arjackson](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/57b2e6/32.png) [@arjackson](https://www.ruby-forum.com/u/arjackson)\
**Post date:** [April 4, 2010, 3:22am UTC](https://www.ruby-forum.com/t/mode-s-dme-classical-ssr/186302/1 "2010-04-04T03:22:00Z")

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I found a copy of Eric C.'s gr-air src

It is quite similiar to what I am doing.

Using a 1090 MHz receiver, Digital Storage Scope and LINUX perl.

Things I am doing

1. DME detection
2. SSR detection and decode - to either Mode A or Mode C (you can’t  
tell)
3. Mode S DF 00 detect
4. Mode S DF 11 detect and decode - 24 bit address
5. Mode S DF 17 detect CA detect Format type decode 24 bit address  
decode
6. Mode S DF 17 aircraft identity decode to callsign

I have yet to do

1. Compact Position Reporting
2. Velocity Message Decode
3. Amplitude variation checking
4. Garbling decode

Andrew R. VK4TEC

April 04 2010

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<div class="post-metadata">

**Author:** ![arjackson](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/57b2e6/32.png) [@arjackson](https://www.ruby-forum.com/u/arjackson)\
**Post date:** [February 27, 2014, 6:37am UTC](https://www.ruby-forum.com/t/mode-s-dme-classical-ssr/186302/2 "2014-02-27T06:37:00Z")

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Hi Andrew,

I am glad to find you have done the work of SSR detection and decoding.  
I am  
struggling to do the same things . Could you send your whole project to  
me?

Thanks,  
Tang

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