Measuring receiver noise parameters for global 21-cm experiments
Abstract
Radiometer experiments to detect 21-cm Hydrogen line emission from the Cosmic Dawn and Epoch of Reionization rely upon precise absolute calibration. Noise generated by amplifiers within the radiometer receiver must be accounted for; however, it is difficult to measure as the noise power varies with source impedance. In this letter, we introduce a convenient method to measure the noise parameters of a receiver system, which is practical for low-frequency receivers used in global 21-cm experiments.
- Publication:
-
2023 XXXVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)
- Pub Date:
- October 2023
- DOI:
- 10.23919/URSIGASS57860.2023.10265626
- Bibcode:
- 2023ursi.confE.225P
- Keywords:
-
- Power measurement; Impedance measurement; Hydrogen; Receivers; Radiometry; Calibration; Noise measurement