The big picture

1
The big picture
2

• Complexity.

3
One-element interferometry
4

• Basic interferometer geometry

5
Coherence function
6
Fourier transform relation
7
Key simplifications

• Spatial incoherence
• Stationarity
• Far field ( D/d gtgt 1)
• Propagation in vacuo
• Small-field (l,m ltlt 1)
• Quasi-monochromatic (dv/v ltlt1)
• Polarization

8
Practical matters

• Antennae (primary beam)
• Receivers, filters (bandpasses)
• Sampling
• Correlators
• Computation approximations
• Deconvolution
• Noise, Error recognition

9
Fourier transform spectrometer
10
Spectroscopic synthesis