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Дата индексирования: Mon Oct 1 22:09:19 2012
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Поисковые слова: cassini spacecraft
Pulsar Instrumentation the Arecibo Observatory

Available Instrumentation


The following table summarizes the basic information of each machine. From left to right, the columns list the machine acronym, the present access of the machines to outside users, the operating mode, total bandwidth (MHz), number of frequency channels, bandwidth per channel (kHz), shortest sampling interval (us), number of bits recorded per sample, number of polarizations recorded and the data storage method.
 
Machine Access Mode  BW  Nchans ChBW Samp  Nbit Npol Storage
WAPP Public Search 100  >32 -
 >28
 16,32  4  Disk
AOFTM Public Search 10  1024  9.8  102.4 2/4  2  Mammoth
PSPM Public Search 7.68 128  60  80  4  2  Exabyte
PSPM Public Timing 7.68 128  60  12  6  2  Disk 
Mk-IV Private Baseband 5  -  -  -  4  4  DLT 
Mk-IV Private Baseband 10  -  -  -  2  4  DLT 
CBR Private Baseband 5  -  -  -  4  4  DLT 
CBR Private Baseband 10  -  -  -  2  4  DLT 
ABPP Public Timing  <112 32  <3.6 varies  2  2  Disk 
ABPP Public Timing  <28  32  <0.875  varies  2  4  Disk 


Click on the acronym of the machine you're interested in for more details. Note that some machines have more than one mode of operation and hence more than one entry in the table. Use of private access machines is possible only by prior consent with the appropriate contact(s) which can be found in the detailed information for each machine.

The Wideband Arecibo Pulsar Processor (WAPP)

This is a facility instrument of the observatory. It is a fast-dump correlator with programmable numbers of lags and time resolution. Available for use after February 2000.

Specifications at first light:
- Total bandwidth: 100 MHz
- Number of Lags: >= 32
- Time resolution: >= 28 microsec
- Polarizations: 4
- Data sampling: 16 or 32 bit
- Data storage: Disk/Exabyte
- Mode(s) of operation: search, single pulses, polarimetry

For more information contact Bill Sisk or Jeff Hagen and check the WAPP home page.
Click here to see the first pulses (from the 0.7 s pulsar B1541+09) recorded by WAPP at 1.4 GHz.

The Arecibo Observatory Fourier Transform Machine (AOFTM)

This facility instrument of the observatory, is a fast-dump spectrometer with programmable numbers of channels and time resolution. Download this PostScript file for more details and examples of how to take data with the AOFTM.

Specifications:
- Total bandwidth: 10 MHz
- Frequency channels: 1024
- Time resolution: 102.4 us
- Polarizations: 2
- Data sampling: 2/4 bit
- Data storage: Mammoth tape drive
- Mode(s) of operation: search

For more information contact Jim Cordes and check the AOFTM help page

The Penn State Pulsar Machine (PSPM)

This is a high spectral resolution filter bank which serves as a user owned public acess instrument for the on-going 430 MHz drift scan surveys at the observatory. Download this PostScript file for more details and examples of how to take data with the PSPM.

Specifications:
- Total bandwidth: 7.68 MHz
- Frequency channels: 128
- Time resolution: 80 us
- Polarizations: 2
- Data sampling: 4-bit in search mode, 6-bit in timing mode
- Data storage: workstation disk in timing/pointed search; exabyte drive for drift scans
- Mode(s) of operation: search/timing

For more information contact Alex Wolszczan and, for local help, Paulo Freire. A simple manual for operating this machine will be written and linked to this site soon.

The Princeton Mk-IV data aquisition system

The Mk-IV is a baseband recorder owned by the Princeton Pulsar Group.

Specifications:
- Total bandwidth: 5 or 10 MHz
- Polarizations: 4
- Data sampling: 2 or 4-bit depending on BW
- Data storage: workstation disk and DLT
- Mode(s) of operation: baseband recording

For more information contact Ingrid Stairs and check the Mk-IV page.

The Caltech baseband recorder (CBR)

The CBR is a user owned baseband recorder.

Specifications:
- Total bandwidth: 5 or 10 MHz
- Polarizations: 4
- Data sampling: 2 or 4-bit depending on BW and 8-bin in timing mode
- Data storage: a pair of DLT drives
- Mode(s) of operation: baseband recording and timing

For more information contact Stuart Anderson.

The Arecibo-Berkeley Pulsar Processor (ABPP)

The ABPP is a user-owned public access coherent dispersion removal processor, suitable for pulsar timing, polarimetry and other pulsar science.

Specifications:
- Total bandwidth: 112 MHz in total power coherent mode
- Polarizations: 2 or 4
- Data storage: PC/unix disk
- Mode(s) of operation: timing mode (coherent dedispersion)

For more information contact Don Backer and check the ABPP and BPP pages.

Last updated:Friday, 11-Mar-2005 13:58:36 AST

P. Freire