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lbaops:dfb3das [2010/12/21 14:56]
chris.phillips
lbaops:dfb3das [2015/12/18 16:38]
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-====  DFB3 for VLBI ==== 
- 
-[[.:​dfb3notes | Technical Notes]] 
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-====  Current State ==== 
- 
-The Parkes Pulsar backend DFB3 has a baseband mode, used with APSR. This instrument fulfills the basic requirements of a broadband VLBI backend. 
- 
-  *  1 GHz or 256 MHz front end bandwidth 
-  *  Divide by 16 filterbank (ie 64 MHz channels with 1 GHz front end). 
-    *  16 MHz channels with 256 MHz front end 
-  *  Bits selectable from 1-8 
-  *  UDP data transport with simple 24 byte timing header 
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-====  Requirements ==== 
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-To convert to system suitable for VLBI the following changes are needed 
- 
-  *  More filterbank options (divide by 32 and divide by 64 have filters already designed) 
-    *  Giving 32/16 MHz channels with 1 GHz front end or 8/4 MHz with 256 MHz front end) 
-  *  [[http://​www.vlbi.org/​vdif/​ | VDIF ]] packet headers ​ 
-  *  Packet sizes to conform to VDIF requirements,​ specifically an integral number of packets/sec 
-  *  Tsys monitoring 
- 
-====  Potential extra work ==== 
-  *   ​Linear->​circular conversion 
-    *  including calibration of x-y phase correction 
- 
-  *  Fringe rotation 
- 
  
lbaops/dfb3das.txt · Last modified: 2015/12/18 16:38 (external edit)