| Antenna Array | Hexagonal close-packed transit array | ||
| Petite | Full | Petite array: Achieve science
goals A. & F. and
∼ 30% of B.-E. |
|
| array diameter | 600m | 1500m | |
| fill factor | 50% | 50% | Full array: Achieve all science goals |
| number of elements | 5,000 | 32,000 | |
| 10 σ single transit sens. | 8.7μJy | 1.3μJy | |
| Array element | Parabolic on-axis 6m dish with 1D pointing | Small for short baselines, D ≫ λmin for systematics | |
| construction | on-site fiber glass production, mm surface accuracy | Better beam control than Stage I for systematics | |
| OMT | ultra-wide band, dual-pol | ||
| front-end | amplifiers and digitizers integrated with OMT | alternative arrangement to be explored | |
| channelizer | one per 10-100 dishes | helps with corner-turning, alternatives possible | |
| Correlator | FFT correlator with partial N2 correlations | Individual baseline correlation mode for calibration. | |
| FRB capability | real-time FRB search engine | ||
| real-time beam-forming | 104 concurrent tracking beams | pulsar, transients, multi-messenger | |
| Survey | |
| area | 50% |
| observing time | 5 years on sky, wall-time 7-10 years |
| Calibration | |
| complex amplitude | sky sources |
| primary beam | per antenna calibration using fixed wing drones |
| clock distribution | sub ps clock distribution for phase stability |
For a python module that calculates the noise parameters see Downloads.