Physics#
The calibration engine implements the standard heterodyne calibration equation, converting raw detector counts into antenna temperature \(T_A^*\) corrected for atmospheric absorption. This section derives each component of the equation and maps it to its implementation.
Symbol Reference#
Symbol |
Meaning |
Unit |
Typical range |
|---|---|---|---|
\(T_A^*\) |
Antenna temperature (atmosphere-corrected) |
K |
−1 to 100 |
\(\gamma\) |
Gain calibration factor (counts → K) |
K/count |
10⁻⁴ to 10⁻² |
\(T_{rec}\) |
Receiver noise temperature (SSB) |
K |
100 to 5000 |
\(T_{sys}\) |
System temperature |
K |
200 to 10000 |
\(\tau_0\) |
Zenith optical depth |
Np |
0.01 to 5 |
\(t_r\) |
Atmospheric transmission |
— |
0.01 to 0.99 |
PWV |
Precipitable water vapour |
mm |
0.01 to 10 |
\(f_{eff}\) |
Forward efficiency |
— |
0.95 to 0.99 |
\(g_s x_s\) |
Signal sideband gain × suppression |
— |
0.5 |
\(g_i x_i\) |
Image sideband gain × suppression |
— |
0.5 |