|Description:|| DESP end-to-end tests are used to check the integrity of the signal paths through the ARTS firmware, from the analogue-to-digital converter to the data recorder.|
Now, as well as varying the frequency and amplitude of the test signal, we can change its phase. Recently this feature was used to check the Stokes U and V outputs from the ARTS science case 4 firmware.
In this test, sinusoids with identical amplitude and phase were applied to both the X- and Y-polarization inputs. The phase of the Y-pol was held steady, while the X-pol phase was swept through 360 degrees, in 2 degree steps. The results indicate that U and V respond inusoidally to the input phase difference, with a 90 degree offset.
This is what we expect, give or take a sign error.
|Copyright:||J Hargreaves, P Donker|