mg002

Modified 17:05, 4 Sep 2017 by jwagner | Page History

1. MG002 Correlation Report
2. General:
3. Fringes:
4. Notes:
5. Auxiliary:

Version as of 00:07, 29 Nov 2024

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MG002 Correlation Report

General:

Session info: http://www3.mpifr-bonn.mpg.de/div/vlbi/globalmm/
Station feedback: http://www3.mpifr-bonn.mpg.de/div/vlbi/globalmm/sessions/apr17/feedback_apr17.asc
ALMA QA2: 2016.1.01116.V was used for polarization conversion
This experiment has ALMA with 32x62.5MHz, VLBA with 2x128MHz channels, and most of the EVN with a 1x512MHz channel
Two EVN stations (Yebes, Pico Veleta) observed in an incorrect backend mode, with a 32 MHz polyphase filterbank.
Due to the issue at Yebes and Pico, three correlations were performed:
- a) standard ALMA correlation setup (58 MHz bands) discarding Yebes and Pico
- b) narrower band correlation setup (32 MHz bands) including Yebes and Pico
- c) mixed-band correlation with additional postprocessing of all baselines to Yebes and Pico Veleta (reconstructed 58 MHz bands)
The correlation output (c) appears correct, but uses a new feature that has not been vigorously tested. The data are provided without guarantees. Details are given further below.

Fringes:

Station	Fringes	Comment
Ef	yes no0093.pdf	Effelsberg DBBC2
Eb	yes	Effelsberg RDBE
On	yes no0093.pdf
Aa	yes no0093.pdf
Mh	no	faulty backend configuration
Pv	yes	LCP bad (2bit sample dist. 78%:0:0:22%), is OK in ma008 and mb007
Ys	yes
Fd	yes
La	yes
Pt	yes	weak or no fringes
Nl	yes
La	yes
Kp	yes
Ov	yes
Br	yes	Fringes only to La/Mk/Ov

Mh weak fringes in LCP to Onsala at beginning. Auto-correlations indicate errors in Mh.
No fringes to Pt
VLBA Fringes were found using the 2x128MHz mode.
Fringes between ALMA and Eb (Effelsberg RDBE 2x128MHz): Aa-Eb.pdf . SNR for Aa-Eb much lower than for Aa-Ef. Needs to be investigated
Strong fringes between ALMA and Yebes, Pico with PFB setup in .vex and with ALMA-matching 9*32MHz zoombands in .v2d (288 MHz total): Aa-Ys RR, and Aa-Pv RR
Fringes between Effelsberg and Yebes(,Pico) with 16x32M PFB setup and 31x16MHz (due PFB edge channels) zoombands: Ef-Ys RR 31x16M, Ef-Ys LL 31x16M, Pv-Ys RR 31x16M

Notes:

PV scan: /mnt/disks/4/7/data/ma008_PV_093-2145.vdif marked invalid by vdifuse
PV: bad statistics before 092-2100 (OK after systems was restarted at Pico)
PV: DBBC2 backend ran in polyphase filter bank mode, data are 16 ch x 2 pol x 32 MHz
YS: DBBC2 backend ran in polyphase filter bank mode, data are 16 ch x 2 pol x 32 MHz
MH: Autoccorelations look corrupted. Suspicous of 32 MHz sub-bands displayed as full band: So far no fringes, except for LCP (weak) in Scan No064. (MM-LCP.ps MM-RCP.ps)
VLBA: subintNS has to be choosen to be 640000 when adding in VLBA (and EB) having 128 MHz wide subbands. If run with the default settings an WARNING concerning "data gaps" is received and no data is being correlated.

Auxiliary:

The exact zoom bands after matching ALMA constraints against Pico/Yebes 32 MHz PFB bands, without yet considering extra coverage of the 1x512MHz and 2x256MHz of other stations, are:

addZoomFreq = freq@86508.000000/bw@32.000000/noparent@true  # ALMA ch11 x Pico ch00
addZoomFreq = freq@86476.000000/bw@28.328125/noparent@true  # ALMA ch12 x Pico ch01
addZoomFreq = freq@86444.000000/bw@32.000000/noparent@true  # ALMA ch12 x Pico ch02
addZoomFreq = freq@86444.000000/bw@1.734375/noparent@true  # ALMA ch13 x Pico ch02
addZoomFreq = freq@86412.000000/bw@32.000000/noparent@true  # ALMA ch13 x Pico ch03
addZoomFreq = freq@86380.000000/bw@7.140625/noparent@true  # ALMA ch14 x Pico ch04
addZoomFreq = freq@86348.000000/bw@32.000000/noparent@true  # ALMA ch14 x Pico ch05
addZoomFreq = freq@86316.000000/bw@12.546875/noparent@true  # ALMA ch15 x Pico ch06
addZoomFreq = freq@86284.000000/bw@32.000000/noparent@true  # ALMA ch15 x Pico ch07
addZoomFreq = freq@86252.000000/bw@17.953125/noparent@true  # ALMA ch16 x Pico ch08
addZoomFreq = freq@86220.000000/bw@32.000000/noparent@true  # ALMA ch16 x Pico ch09
addZoomFreq = freq@86188.000000/bw@23.359375/noparent@true  # ALMA ch17 x Pico ch10
addZoomFreq = freq@86156.000000/bw@32.000000/noparent@true  # ALMA ch17 x Pico ch11
addZoomFreq = freq@86124.000000/bw@28.765625/noparent@true  # ALMA ch18 x Pico ch12
addZoomFreq = freq@86092.000000/bw@32.000000/noparent@true  # ALMA ch18 x Pico ch13
addZoomFreq = freq@86092.000000/bw@2.171875/noparent@true  # ALMA ch19 x Pico ch13
addZoomFreq = freq@86060.000000/bw@32.000000/noparent@true  # ALMA ch19 x Pico ch14
addZoomFreq = freq@86028.000000/bw@7.578125/noparent@true  # ALMA ch20 x Pico ch15

The above correlates fine in DiFX but difx2fits and difx2mark4 error out at the unequal bandwidths. One equal-bandwidth option with 9 x 32 MHz is:

addZoomFreq = freq@86508.000000/bw@32.000000/noparent@true  # ALMA ch11 x Pico ch00
addZoomFreq = freq@86444.000000/bw@32.000000/noparent@true  # ALMA ch12 x Pico ch02
addZoomFreq = freq@86412.000000/bw@32.000000/noparent@true  # ALMA ch13 x Pico ch03
addZoomFreq = freq@86348.000000/bw@32.000000/noparent@true  # ALMA ch14 x Pico ch05
addZoomFreq = freq@86284.000000/bw@32.000000/noparent@true  # ALMA ch15 x Pico ch07
addZoomFreq = freq@86220.000000/bw@32.000000/noparent@true  # ALMA ch16 x Pico ch09
addZoomFreq = freq@86156.000000/bw@32.000000/noparent@true  # ALMA ch17 x Pico ch11
addZoomFreq = freq@86092.000000/bw@32.000000/noparent@true  # ALMA ch18 x Pico ch13
addZoomFreq = freq@86060.000000/bw@32.000000/noparent@true  # ALMA ch19 x Pico ch14

The VEX file info for Yebes and Pico are new $FREQ and $TRACK as below:

def FREQ_PFB;
     sample_rate = 64.00 Ms/sec;  * (2bits/sample)
   chan_def = : 86540.00 MHz : L : 32.00 MHz : &CH01 : &BBC01 : &NoCal; *Rcp
   chan_def = : 86540.00 MHz : L : 32.00 MHz : &CH02 : &BBC02 : &NoCal; *Lcp
   chan_def = : 86508.00 MHz : L : 32.00 MHz : &CH03 : &BBC03 : &NoCal; *Rcp
   chan_def = : 86508.00 MHz : L : 32.00 MHz : &CH04 : &BBC04 : &NoCal; *Lcp
   chan_def = : 86476.00 MHz : L : 32.00 MHz : &CH05 : &BBC05 : &NoCal; *Rcp
   chan_def = : 86476.00 MHz : L : 32.00 MHz : &CH06 : &BBC06 : &NoCal; *Lcp
   chan_def = : 86444.00 MHz : L : 32.00 MHz : &CH07 : &BBC07 : &NoCal; *Rcp
   chan_def = : 86444.00 MHz : L : 32.00 MHz : &CH08 : &BBC08 : &NoCal; *Lcp
   chan_def = : 86412.00 MHz : L : 32.00 MHz : &CH09 : &BBC09 : &NoCal; *Rcp
   chan_def = : 86412.00 MHz : L : 32.00 MHz : &CH10 : &BBC10 : &NoCal; *Lcp
   chan_def = : 86380.00 MHz : L : 32.00 MHz : &CH11 : &BBC11 : &NoCal; *Rcp
   chan_def = : 86380.00 MHz : L : 32.00 MHz : &CH12 : &BBC12 : &NoCal; *Lcp
   chan_def = : 86348.00 MHz : L : 32.00 MHz : &CH13 : &BBC13 : &NoCal; *Rcp
   chan_def = : 86348.00 MHz : L : 32.00 MHz : &CH14 : &BBC14 : &NoCal; *Lcp
   chan_def = : 86316.00 MHz : L : 32.00 MHz : &CH15 : &BBC15 : &NoCal; *Rcp
   chan_def = : 86316.00 MHz : L : 32.00 MHz : &CH16 : &BBC16 : &NoCal; *Lcp
   chan_def = : 86284.00 MHz : L : 32.00 MHz : &CH17 : &BBC17 : &NoCal; *Rcp
   chan_def = : 86284.00 MHz : L : 32.00 MHz : &CH18 : &BBC18 : &NoCal; *Lcp
   chan_def = : 86252.00 MHz : L : 32.00 MHz : &CH19 : &BBC19 : &NoCal; *Rcp
   chan_def = : 86252.00 MHz : L : 32.00 MHz : &CH20 : &BBC20 : &NoCal; *Lcp
   chan_def = : 86220.00 MHz : L : 32.00 MHz : &CH21 : &BBC21 : &NoCal; *Rcp
   chan_def = : 86220.00 MHz : L : 32.00 MHz : &CH22 : &BBC22 : &NoCal; *Lcp
   chan_def = : 86188.00 MHz : L : 32.00 MHz : &CH23 : &BBC23 : &NoCal; *Rcp
   chan_def = : 86188.00 MHz : L : 32.00 MHz : &CH24 : &BBC24 : &NoCal; *Lcp
   chan_def = : 86156.00 MHz : L : 32.00 MHz : &CH25 : &BBC25 : &NoCal; *Rcp
   chan_def = : 86156.00 MHz : L : 32.00 MHz : &CH26 : &BBC26 : &NoCal; *Lcp
   chan_def = : 86124.00 MHz : L : 32.00 MHz : &CH27 : &BBC27 : &NoCal; *Rcp
   chan_def = : 86124.00 MHz : L : 32.00 MHz : &CH28 : &BBC28 : &NoCal; *Lcp
   chan_def = : 86092.00 MHz : L : 32.00 MHz : &CH29 : &BBC29 : &NoCal; *Rcp
   chan_def = : 86092.00 MHz : L : 32.00 MHz : &CH30 : &BBC30 : &NoCal; *Lcp
   chan_def = : 86060.00 MHz : L : 32.00 MHz : &CH31 : &BBC31 : &NoCal; *Rcp
   chan_def = : 86060.00 MHz : L : 32.00 MHz : &CH32 : &BBC32 : &NoCal; *Lcp
enddef;
...
def VDIF.PvPFB;
     track_frame_format = VDIF_5032-4096-32-2;  * Pico
     *track_frame_format = VDIF_8032-4096-32-2; * Yebes
     fanout_def =   : &CH01  : sign : 1: 1;
     fanout_def =   : &CH01  :  mag : 1: 1;
     fanout_def =   : &CH02  : sign : 1: 2;
     fanout_def =   : &CH02  :  mag : 1: 2;
     fanout_def =   : &CH03  : sign : 1: 3;
     fanout_def =   : &CH03  :  mag : 1: 3;
     fanout_def =   : &CH04  : sign : 1: 4;
     fanout_def =   : &CH04  :  mag : 1: 4;
     fanout_def =   : &CH05  : sign : 1: 5;
     fanout_def =   : &CH05  :  mag : 1: 5;
     fanout_def =   : &CH06  : sign : 1: 6;
     fanout_def =   : &CH06  :  mag : 1: 6;
     fanout_def =   : &CH07  : sign : 1: 7;
     fanout_def =   : &CH07  :  mag : 1: 7;
     fanout_def =   : &CH08  : sign : 1: 8;
     fanout_def =   : &CH08  :  mag : 1: 8;
     fanout_def =   : &CH09  : sign : 1: 9;
     fanout_def =   : &CH09  :  mag : 1: 9;
     fanout_def =   : &CH10  : sign : 1: 10;
     fanout_def =   : &CH10  :  mag : 1: 10;
     fanout_def =   : &CH11  : sign : 1: 11;
     fanout_def =   : &CH11  :  mag : 1: 11;
     fanout_def =   : &CH12  : sign : 1: 12;
     fanout_def =   : &CH12  :  mag : 1: 12;
     fanout_def =   : &CH13  : sign : 1: 13;
     fanout_def =   : &CH13  :  mag : 1: 13;
     fanout_def =   : &CH14  : sign : 1: 14;
     fanout_def =   : &CH14  :  mag : 1: 14;
     fanout_def =   : &CH15  : sign : 1: 15;
     fanout_def =   : &CH15  :  mag : 1: 15;
     fanout_def =   : &CH16  : sign : 1: 16;
     fanout_def =   : &CH16  :  mag : 1: 16;
     fanout_def =   : &CH17  : sign : 1: 17;
     fanout_def =   : &CH17  :  mag : 1: 17;
     fanout_def =   : &CH18  : sign : 1: 18;
     fanout_def =   : &CH18  :  mag : 1: 18;
     fanout_def =   : &CH19  : sign : 1: 19;
     fanout_def =   : &CH19  :  mag : 1: 19;
     fanout_def =   : &CH20  : sign : 1: 20;
     fanout_def =   : &CH20  :  mag : 1: 20;
     fanout_def =   : &CH21  : sign : 1: 21;
     fanout_def =   : &CH21  :  mag : 1: 21;
     fanout_def =   : &CH22  : sign : 1: 22;
     fanout_def =   : &CH22  :  mag : 1: 22;
     fanout_def =   : &CH23  : sign : 1: 23;
     fanout_def =   : &CH23  :  mag : 1: 23;
     fanout_def =   : &CH24  : sign : 1: 24;
     fanout_def =   : &CH24  :  mag : 1: 24;
     fanout_def =   : &CH25  : sign : 1: 25;
     fanout_def =   : &CH25  :  mag : 1: 25;
     fanout_def =   : &CH26  : sign : 1: 26;
     fanout_def =   : &CH26  :  mag : 1: 26;
     fanout_def =   : &CH27  : sign : 1: 27;
     fanout_def =   : &CH27  :  mag : 1: 27;
     fanout_def =   : &CH28  : sign : 1: 28;
     fanout_def =   : &CH28  :  mag : 1: 28;
     fanout_def =   : &CH29  : sign : 1: 29;
     fanout_def =   : &CH29  :  mag : 1: 29;
     fanout_def =   : &CH30  : sign : 1: 30;
     fanout_def =   : &CH30  :  mag : 1: 30;
     fanout_def =   : &CH31  : sign : 1: 31;
     fanout_def =   : &CH31  :  mag : 1: 31;
     fanout_def =   : &CH32  : sign : 1: 32;
     fanout_def =   : &CH32  :  mag : 1: 32;
enddef;
*

Table of contents

mg002

Table of contents

MG002 Correlation Report

General:

Fringes:

Notes:

Auxiliary:

Table of contents