Dear all, Further to my email earlier this year, I would like to provide an update on the real-time RFI filtering which has now been tested along with the wide-band receiver chain at the GMRT. In the last few months, the design has been subjected to tests under different broadband RFI conditions. The filtering has also been tested using controlled test inputs provided through a programmable broadband RFI emulator developed at the GMRT.
The design is able to successfully detect and filter broadband RFI in real-time up to 300 MHz of receiver bandwidth on ROACH-1 board. The test results have been uploaded on the following link: https://casper.berkeley.edu/wiki/Impulsive_RFI_Excision:_CASPER_Library_Block Apart from this, the design is now generic and has also undergone optimizations at architectural and implementation levels to reduce the overall resource utilization. Please contact us in case you are interested in using this optimized version. Thanks & Regards, Kaushal D. Buch Digital Backend Group, GMRT, NCRA-TIFR, Pune, India +91-2132-258380/258365 [email protected] On Fri, Jan 10, 2014 at 12:40 PM, Kaushal Buch <[email protected]> wrote: > Dear all, > > > > A new design block for RFI detection and excision is made available on the > CASPER website on the following link: > > > > > https://casper.berkeley.edu/wiki/Impulsive_RFI_Excision:_CASPER_Library_Block > > > > This block is intended for removing impulsive time domain (broadband) RFI. > The design uses Median Absolute Deviation based robust estimator for > computing standard deviation in presence of RFI (outliers). Detection and > filtering threshold is computed based on this robust standard deviation. > > > > More details on the implementation of the block and test results are > provided on the above mentioned link. The design has been tested on ROACH-1 > for recorded and simulated data with RFI. Currently, the block can handle > 8-bit fixed point data and a window size of 1024 samples and can be clocked > up to 250 MHz. The block is being integrated and tested with GMRT's > wide-band digital backend. This version is undergoing rigorous testing and > improvements would be reflected in the subsequent versions. The design > will be made more generic in near future. > > > > I hope this design block would be useful to the CASPER community and hope > to get feedback and suggestions for the improvement of this block. > > > > Thanks & Regards, > > > > Kaushal D. Buch > > Digital Backend Group, > > GMRT, NCRA-TIFR, Pune, India > > 91-2132-258380 / 258365 > > [email protected] > > >
