Antenna Beam Width Calculation
The target width measured by suncal is a function both of the antenna beamwidth and of the width of the sun.
If both signals were Gaussian, it would be a simple matter to correct for the sun's width. Unfortunately the sun is a disk of constant power, and the background noise is within a few dB. Here is a table for approximate conversions:
| Antenna Beamwidth (Degrees) | Measured Beamwidth (Degrees) | Difference |
|---|---|---|
| 0.200 | 0.522 | 0.322 |
| 0.300 | 0.534 | 0.234 |
| 0.400 | 0.574 | 0.174 |
| 0.500 | 0.636 | 0.136 |
| 0.600 | 0.711 | 0.111 |
| 0.700 | 0.794 | 0.094 |
| 0.800 | 0.881 | 0.081 |
| 0.900 | 0.972 | 0.072 |
| 1.000 | 1.064 | 0.064 |
| 1.100 | 1.158 | 0.058 |
| 1.200 | 1.253 | 0.053 |
| 1.300 | 1.349 | 0.049 |
| 1.400 | 1.445 | 0.045 |
| 1.500 | 1.542 | 0.042 |
| 1.600 | 1.640 | 0.040 |
| 1.700 | 1.738 | 0.038 |
| 1.800 | 1.835 | 0.035 |
| 1.900 | 1.938 | 0.033 |
| 2.000 | 2.035 | 0.031 |