Radio Data Analysis & Noise

Announcements

• All classes will now be online through Zoom. • No more observations. – Will provide data.

• Zoom allows for presentations, so we will keep the current presentation schedule.

• Group A (March 23)• Group B and C (March 30)

• Make sure you’ve started on Lab #6, we can’t extend the deadline into exam period!

Taking Observations• 2.3-meter satellite

dish• F-ratio: 0.375• Mount: Alt-Az• Beam Width ~ λ/D

Signal Chain

AirSpy

Computer

GPU

Telescope

Feed

Coax

Low Noise Amplifiers/

FiltersRaw

VoltageStream

ChannelizeIntegrate

Integrated Spectra/Time Stream

Alt Az versus Equatorial

LAB Survey – Kalberla et al. 2005

HI Intensity

On vs Off Galaxy

On vs Off Galaxy

Residuals

Residuals

De-trending Data

De-trending Data

White, Red, Pink, Brown:A Rainbow of Noise

1/f Noise

Stock Markets:P µ f -1.8

Close to Brown

Most Instruments: White + 1/f

Mapping the Galaxy

Mapping the Galaxy

Good Luck!