Parkes Digitial Filterbank v. 3

Capability

Specifications

Block diagram of the PDFB3/APSR system currently under development by the ATNF and Swinburne University. The C and D inputs may be used for real-time interference mitigation system (as drawn) or may be used for an independent DFB system. Input signals are Nyquist sampled with 9-bit precision.

Configurations

Config file name	BW (MHz)	Nr IFs	Nr Pol	Nr Chan	Nr Bins	Bins/Period	MinPrd(ms)

apsr_1024_2048	1024	2	4	2048	1	1	--

srch_1024_512	1024	2	4	512	1	1	--
srch_256_1024	256	2	4	1024	1	1	--
srch_256_512	256	2	4	512	1	1	--

pdfb3_2048_64_2048	64	2	4	2048	2048	2048	65.60
pdfb3_1024_64_2048	64	2	4	2048	1024	1024	32.80
pdfb3_1024_64_1024	64	2	4	1024	1024	1024	16.40
pdfb3_1024_64_512	64	2	4	512	1024	1024	8.20
pdfb3_512_64_2048	64	2	4	2048	512	512	16.40
pdfb3_512_64_1024	64	2	4	1024	512	512	8.20
pdfb3_512_64_512	64	2	4	512	512	512	4.10
pdfb3_256_64_2048	64	2	4	2048	256	256	8.20
pdfb3_256_64_1024	64	2	4	1024	256	256	4.10
pdfb3_256_64_512	64	2	4	512	256	256	2.05
pdfb3_128_64_2048	64	2	4	2048	128	128	4.10
pdfb3_128_64_1024	64	2	4	1024	128	128	2.05
pdfb3_128_64_512	64	2	4	512	128	128	1.03

pdfb3_2048_256_2048	256	2	4	2048	2048	2048	16.40
pdfb3_2048_256_1024	256	2	4	1024	2048	2048	8.20
pdfb3_2048_256_512	256	2	4	512	2048	2048	4.10
pdfb3_1024_256_2048	256	2	4	2048	1024	1024	8.20
pdfb3_1024_256_1024	256	2	4	1024	1024	1024	4.10
pdfb3_1024_256_512	256	2	4	512	1024	1024	2.05
pdfb3_512_256_2048	256	2	4	2048	512	512	4.10
pdfb3_512_256_1024	256	2	4	1024	512	512	2.05
pdfb3_256_256_2048	256	2	4	2048	256	256	2.05
pdfb3_256_256_1024	256	2	4	1024	256	256	1.03

pdfb3_2048_512_2048	512	2	4	2048	2048	2048	8.20
pdfb3_1024_512_2048	512	2	4	2048	2048	2048	8.20
pdfb3_1024_512_1024	512	2	4	1024	1024	1024	2.05
pdfb3_512_512_2048	512	2	4	2048	512	512	2.05
pdfb3_512_512_512	512	2	4	512	512	512	0.52

pdfb3_2048_1024_2048	1024	2	4	2048	2048	2048	4.10
pdfb3_2048_1024_1024	1024	2	4	1024	2048	2048	2.05
pdfb3_2048_1024_512	1024	2	4	512	2048	2048	1.03
pdfb3_1024_1024_2048	1024	2	4	2048	1024	1024	2.05
pdfb3_1024_1024_1024	1024	2	4	1024	1024	1024	1.03
pdfb3_1024_1024_512	1024	2	4	512	1024	1024	0.52
pdfb3_512_1024_2048	1024	2	4	2048	512	512	1.03
pdfb3_512_1024_1024	1024	2	4	1024	512	512	0.52
pdfb3_512_1024_512	1024	2	4	512	512	512	0.26
pdfb3_256_1024_2048	1024	2	4	512	256	256	0.52

Note: The TCS configuration file is located at /nfs/online/local/tcs/cfg/DFB3psr.cfg

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Keywords for PDFB3

AP_NBAND	APSR: Nr of baseband signals across total bandpass
AP_NBIT	APSR: Nr of bits per datum
AP_NDIG	APSR: Nr of digitiser inputs
AP_PROCF	APSR: Name of processing script file
AP_TLEV	APSR: Interval between auto level setting [s], 0 = off.
CAL	Calibration mode (SYNC, FREQ, EXT1, EXT2)
CDCYC	Calibration duty cycle [%]
CFRQ	Calibration pulse repetition frequency [Hz]
CPHS	Calibration pulse phase [deg]
CPFRQ1	CPSR2: Radio frequency, band 1 [MHz]
CPFRQ2	CPSR2: Radio frequency, band 2 [MHz]
D3_CFG	PDFB3: Configuration file name
D3_FRQ	PDFB3: Centre radio frequency [MHz]
D3_TCYC	PDFB3: Cycle time [s]
D3_TSUB	PDFB3: Subint time [s]
FDANG	Feed angle or Position Angle [deg]
FDMODE	Fixed FA (DISABLED) or fixed PA (CONTINUOUS)
MODE	Observing mode (PSR, CAL, LEVCAL, PSRCAL, SRCHSET, SRCH, SRCHCAL)
PM_FRQ1	PMCTRL: (AFB) Radio frequency 1 [MHz]
PM_FRQ2	PMCTRL: (AFB) Radio frequency 2 [MHz]
RCVR	Receiver (e.g., MULTI, H-OH, 1050CM)
RFF_GAIN	Loop gain for RFI adaptive filter
RFF_TC	Time constant for RFI adaptive filter [s]
RFT3_LEV	Threshold for time-domain RFI clipping [sigma], 0=off
SR3_BTC	Time constant for baseline subtraction in search mode
SR3_DDM	DM for de-dispersion
SR3_DNCH	Number of channels per subband for de-dispersion
SR3_FTMX	Maximum search-mode file size [s]
SR3_NBIT	Number of bits per sample for search-mode data
SR3_NPROD	Number of polarisation products for search-mode data
SR3_NSBLK	Number of samples per block (subint) for search-mode data
SR3_TSMP	Sample time for search-mode data [microsec]
TOBS	Observation time [s]

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Troubleshooting

PDFB3: To restart the bcc processes on pkccc3 (block 2) you can log on and issue the bcckill command (same proceedure as for pkbcc04). To restart the processes on l-bcc06 and l-bcc11 it is currently necessary to log into these as root from pkccc3 and type ``reboot''. A power-cycle of DFB3 will achieve the same result but this is not currently recommended