# \[GSoC\] gr-radar: Echotimer (USRP interface) and FSK Radar Demonstration

**URL:** <https://www.ruby-forum.com/t/gsoc-gr-radar-echotimer-usrp-interface-and-fsk-radar-demonstration/230418>\
**Category:** GNU Radio\
**Created:** [June 17, 2014, 1:01pm UTC](https://www.ruby-forum.com/t/gsoc-gr-radar-echotimer-usrp-interface-and-fsk-radar-demonstration/230418 "2014-06-17T13:01:15Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![jason\_sam](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/7993a0/32.png) [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\
**Post date:** [June 17, 2014, 1:01pm UTC](https://www.ruby-forum.com/t/gsoc-gr-radar-echotimer-usrp-interface-and-fsk-radar-demonstration/230418/1 "2014-06-17T13:01:15Z")

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Hi!

The GNU Radio Radar Toolbox has some nice new features!

First the USRP interface for synchronized TX/RX streams is finished. It  
ensures that any waveform given by a tagged stream is received with only  
a constant delay due to hardware delays. Therefore a MIMO connection  
between two USRPs is needed. This delay can be evaluated with a simple  
calibration setup and is fix for a specific hardware setup for all time.  
Then the TX/RX streams of the radar system are in sync and you can start  
with velocity and range estimations! Check out the post on my blog for  
more information and an example video [0].

Second a FSK radar demonstrator is set up! It provides a single target  
detection every 210ms with 0.25m/s velocity resolution and a maximum  
range of 120m. Two USRP N210 and simple 2.4GHz wifi beam antennas are  
used. Check out my blog again [1]! You will find there more information,  
e.g. a second demonstration video of the FSK radar and the GRC  
flowgraph.

Greetings,  
Stefan

[0]

> **[Synchronisation Echotimer (USRP interface)](https://grradar.wordpress.com/2014/06/17/synchronisation-echotimer-usrp-interface/)**
>
> Now the radar toolbox provides a synchronized USRP interface! The new interface is called echotimer. Input and output are tagged streams and the setup are two USRPs connected with a MIMO cable with…

[1] [FSK Radar Demonstration – GNU Radio Radar Toolbox](https://grradar.wordpress.com/2014/06/17/fsk-radar-demonstration/)