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Backend System

Our Team:

Ajit Kumar  (Group Co-ordinator)

Analog  
Sweta, Gupta. Hande, P. J.
Shinde, N. D. Nanaware, D. K
Phakatkar, S. V.  
  Atul Ganla  

   

Digital  
Sandeep Choudhari Shelton, G. H
Harshvardhan Readdy Mekhla, Mule
Halagalli, I. Buch, Kaushal
Bhonde, I. S.  

 

Computer, RFI and Other Activities  
Joardar, S. Yogesh Gaikwad
Mangesh Umbarje. Sumit Mirajkar

 


  

Upgrade Plan:


Analog Processing of the RF signals from antenna received at Central Electronics Building. Convert the Analog signals so that it can be digitised and further processing can be done. Digitise the RF signals to get a 400 MHz bandwidth from each polarisation channel. Process the signals to produce interferometry and array outputs.  

 


Block Diagram:

1. GMRT Backend Schematic:

baseband_block.jpg

 


System Specifications:


Analog System :
Input Freq : 30 - 1600 MHz
Input Power : -24 dBm
Max Bandwidth : 400 MHz
Headroom : 27 dB
Output power : -12 dBm
Noise Contribution to FE < 0.01 K
Filter bank – 7 filter selection
1 BB converted signal
Power detector at input and output
Noise + CW cal signal at input
Noise (var corr) cal at ADC input
Digital System :
ADC No. of Bits : 8 bits
Inst Bandwidth : 400 MHz
FFT No. of Channels : 8 K
Mode Available : Full polar
Coarse and Fine Delay correction
Fringe rotation
Interferometer with dump times ~ 100 ms
Incoherent and Phased array beam outputs : at least 2 beams for each; with full time
resolution
Pulsar back-ends attached to the beam outputs

 


 Current Status:

current_status.JPG 


 

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