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projects:iram_obs [2014/07/11 21:05] ramesh created |
projects:iram_obs [2014/07/23 13:14] (current) ptorne |
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| ====== IRAM 30m Observations ====== | ====== IRAM 30m Observations ====== | ||
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| + | Observations log here: [[https://tapas.iram.es/tapas/]] -> Tab "My Projects" | ||
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| + | ==== Hardware ==== | ||
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| + | A ROACH2 board, RaspberryPi and a 1U rack-mounted computer together make up the hardware for the upcoming Pico Velata observations. The set up is currently housed in the Digital lab. The ROACH2 board will generate a few 16 MHz base bands, and one of these bands will be recorded on the computer. A RaspberryPi is there to programatically control the sampling clock of ADC. The computer will also allow us to process and plot the data from the broadband continuum backend (BBC) | ||
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| + | The computer has four network interfaces: | ||
| + | - eth0 - bound to an ip-address through DHCP | ||
| + | - eth1 - bound to 192.168.2.1 + ROACH2 (192.168.2.100) + RaspberryPi (192.168.2.200) | ||
| + | - eth2/3 - 10GbE interfaces that receive data from the ROACH2 board | ||
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| + | Software/OS setup on the computer: | ||
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| + | * Runs Debian Squeeze, and only user pulsar can log in. | ||
| + | * Machine is assigned an ip of 134.104.22.254 via DHCP | ||
| + | * packages installed: dspsr, psrchive, fftw, cfitsio, sigproc, gsl | ||
| + | * Software packages are built under /data1/dump/build and installed in /home/pulsar/linux | ||
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| + | == Pico Velata == | ||
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| + | * Machine to get IP via DHCP (check NTP server as well) | ||
| + | * Check | ||
| ==== Test observations ==== | ==== Test observations ==== | ||
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| * Folding with dspsr | * Folding with dspsr | ||
| * periodicity search before and after de-baselining | * periodicity search before and after de-baselining | ||
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| + | == PSR B0355+54 == | ||
| + | |||
| + | * Start time: | ||
| + | * Duration : | ||
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| + | **Notes & Plots** | ||
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| + | Unclipped and un-baselined timeseries data. Seems to be only minor red-noise effects. Large bursts should be clipped:\\ | ||
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| + | {{:projects:0355_54_timseries_noclip_nobase_crop.jpeg?200 |}} | ||
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| + | To test if red-noise is having a big influence on the power in the timeseries, performed FFTs of both the un-baselined data and baselined data. As can be seen there is only a moderate red-noise component in file0:\\ | ||
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| + | {{:projects:file0_nobase_noclip_dm0_00.spc.jpg?200 |}} | ||
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| + | {{:projects:file0_noclip_dm0_00.spc.jpg?200 |}} | ||
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