Matches in SemOpenAlex for { <https://semopenalex.org/work/W3208616617> ?p ?o ?g. }
- W3208616617 endingPage "151" @default.
- W3208616617 startingPage "151" @default.
- W3208616617 abstract "Abstract We introduce CALibration AMITY ( calamity ), a precision bandpass calibration method for radio interferometry. calamity can solve for direction-independent gains with arbitrary frequency structure to the high precision required for 21 cm cosmology with minimal knowledge of foregrounds or antenna beams and does not require any degree of redundancy (repeated identical measurements of the same baseline). We have achieved this through two key innovations. First, we model the foregrounds on each baseline independently using a flexible and highly efficient set of basis functions that have minimal overlap with 21 cm modes and enforce spectral smoothness in the calibrated foregrounds. Second, we use an off-the-shelf GPU accelerated API ( tensorflow ) to solve for per-baseline foregrounds simultaneously with per-frequency antenna gains in a single optimization loop. GPU acceleration is critical for our technique to be able to solve for the large numbers of foreground and gain parameters simultaneously across all frequencies for an interferometer with ≳10 antennas in a reasonable amount of time. In this paper, we give an overview of our technique and, using realistic simulations, demonstrate its performance in solving for and removing pathological gain structures down to 4.5 orders of magnitude below the level of foregrounds and consistent with our simulated thermal noise limit. If readers want to start using calamity now, they can find a tutorial notebook online." @default.
- W3208616617 created "2021-11-08" @default.
- W3208616617 creator A5008401694 @default.
- W3208616617 creator A5013594036 @default.
- W3208616617 creator A5024608470 @default.
- W3208616617 creator A5032209791 @default.
- W3208616617 creator A5033184981 @default.
- W3208616617 creator A5088100194 @default.
- W3208616617 date "2022-10-01" @default.
- W3208616617 modified "2023-09-27" @default.
- W3208616617 title "Precision Calibration of Radio Interferometers for 21 cm Cosmology with No Redundancy and Little Knowledge of Antenna Beams and the Radio Sky" @default.
- W3208616617 cites W1633529777 @default.
- W3208616617 cites W1680526100 @default.
- W3208616617 cites W1971295652 @default.
- W3208616617 cites W1971336066 @default.
- W3208616617 cites W1980480522 @default.
- W3208616617 cites W1994882705 @default.
- W3208616617 cites W1999620445 @default.
- W3208616617 cites W2010864262 @default.
- W3208616617 cites W2011301426 @default.
- W3208616617 cites W2025670910 @default.
- W3208616617 cites W2061524193 @default.
- W3208616617 cites W2073938066 @default.
- W3208616617 cites W2078677259 @default.
- W3208616617 cites W2091780059 @default.
- W3208616617 cites W2097772074 @default.
- W3208616617 cites W2101179843 @default.
- W3208616617 cites W2110140970 @default.
- W3208616617 cites W2115384982 @default.
- W3208616617 cites W2124576294 @default.
- W3208616617 cites W2129875460 @default.
- W3208616617 cites W2133593080 @default.
- W3208616617 cites W2134435348 @default.
- W3208616617 cites W2147626801 @default.
- W3208616617 cites W2160430658 @default.
- W3208616617 cites W2163066012 @default.
- W3208616617 cites W2170252886 @default.
- W3208616617 cites W2174313699 @default.
- W3208616617 cites W2261471082 @default.
- W3208616617 cites W2275063742 @default.
- W3208616617 cites W2289671972 @default.
- W3208616617 cites W2318746044 @default.
- W3208616617 cites W2337214373 @default.
- W3208616617 cites W2338472148 @default.
- W3208616617 cites W2406953026 @default.
- W3208616617 cites W2466442027 @default.
- W3208616617 cites W2478284440 @default.
- W3208616617 cites W2520740623 @default.
- W3208616617 cites W2530040139 @default.
- W3208616617 cites W2583769595 @default.
- W3208616617 cites W2589558125 @default.
- W3208616617 cites W2597412078 @default.
- W3208616617 cites W2624022630 @default.
- W3208616617 cites W2737482437 @default.
- W3208616617 cites W2760808915 @default.
- W3208616617 cites W2762741961 @default.
- W3208616617 cites W2780106184 @default.
- W3208616617 cites W2799535791 @default.
- W3208616617 cites W2884820149 @default.
- W3208616617 cites W2886992169 @default.
- W3208616617 cites W2890204506 @default.
- W3208616617 cites W2890583677 @default.
- W3208616617 cites W2892772871 @default.
- W3208616617 cites W2898426732 @default.
- W3208616617 cites W2898725592 @default.
- W3208616617 cites W2909537245 @default.
- W3208616617 cites W2945878521 @default.
- W3208616617 cites W2952145902 @default.
- W3208616617 cites W2952288901 @default.
- W3208616617 cites W2963891109 @default.
- W3208616617 cites W2976009229 @default.
- W3208616617 cites W2981262744 @default.
- W3208616617 cites W2986694800 @default.
- W3208616617 cites W2995207491 @default.
- W3208616617 cites W3008175249 @default.
- W3208616617 cites W3010798932 @default.
- W3208616617 cites W3011247457 @default.
- W3208616617 cites W3016312540 @default.
- W3208616617 cites W3020417722 @default.
- W3208616617 cites W3026700980 @default.
- W3208616617 cites W3087633318 @default.
- W3208616617 cites W3093754683 @default.
- W3208616617 cites W3097306519 @default.
- W3208616617 cites W3098183369 @default.
- W3208616617 cites W3098495603 @default.
- W3208616617 cites W3098548104 @default.
- W3208616617 cites W3098903043 @default.
- W3208616617 cites W3099145578 @default.
- W3208616617 cites W3099549606 @default.
- W3208616617 cites W3099783338 @default.
- W3208616617 cites W3099863073 @default.
- W3208616617 cites W3099878876 @default.
- W3208616617 cites W3100387858 @default.
- W3208616617 cites W3100838901 @default.
- W3208616617 cites W3100901477 @default.
- W3208616617 cites W3101208819 @default.
- W3208616617 cites W3101657927 @default.
- W3208616617 cites W3102664041 @default.