SPR1-1418: New beamformer raster scan script #446
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This electronically scans the beamformer across a source in a series of pointings. Each pointing lasts at least long as the delay model update rate, to ensure that it is properly set. This is typically used in conjunction with a custom SPEAD receiver that dumps the beamformer ingest signal display stream (1 Hz dump rate) to a file. It currently only steers beam `0x`, since the signal display only supports `0x` and `0y` anyway. This is the latest version used in the steerable beam tests on 22 September 2021.
spassmoor
requested changes
Nov 4, 2021
| session.cbf.req.set_beam_target('wide.tied-array-channelised-voltage.0x', target) | ||
| # user_logger.info(' (%s -> %s)', stream.name, target) | ||
| time_spent = time.time() - before | ||
| time.sleep(duration - time_spent) |
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Since part of the function of the script is to change the phase centre after the beam weights/target has been set, there should be some logging here to report the time_spent setting them.
| user_logger.info('performing scan %d (%d pointings)', index, num_pointings) | ||
| session.activity('scan') | ||
| for x, y in zip(x_steps, y_steps): | ||
| mid_pointing = time.time() + pointing_duration / 2. |
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This will be incorrect if the time_spent > pointing duration
| session.cbf.req.set_beam_target('wide.tied-array-channelised-voltage.0x', target) | ||
| # user_logger.info(' (%s -> %s)', stream.name, target) | ||
| time_spent = time.time() - before | ||
| time.sleep(duration - time_spent) |
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Is the use of this script likely to have time_spent ~ pointing_duration . There would be no actual dwell time in this case
| for stream in session.cbf.beamformers: | ||
| if not stream.name.endswith('0x'): | ||
| continue | ||
| session.cbf.req.set_beam_target('wide.tied-array-channelised-voltage.0x', target) |
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Is there any checking that this succeeds ? . I suppose the bumble on approach is the best way to deal with failure . Is failure reported as a log ?
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This electronically scans the beamformer across a source in a series
of pointings. Each pointing lasts at least long as the delay model
update rate, to ensure that it is properly set. This is typically used
in conjunction with a custom SPEAD receiver that dumps the beamformer
ingest signal display stream (1 Hz dump rate) to a file.
It currently only steers beam
0x, since the signal display onlysupports
0xand0yanyway. This is the latest version used in thesteerable beam tests on 22 September 2021.