py21cmsense.observatory.Observatory.projected_baselines¶
- Observatory.projected_baselines(baselines: ~astropy.units.quantity.Quantity | None = None, time_offset: ~astropy.units.quantity.Quantity = <Quantity 0. h>) ndarray [source]¶
The projected baseline lengths (in wavelengths).
Phased to a point that has rotated off zenith by some time_offset.
- Parameters:
baselines – The baseline co-ordinates to project, assumed to be in metres. If not provided, uses all baselines of the observatory. Shape of the array can be (N,N,3) or (N, 3). The co-ordinates are expected to be in ENU.
time_offset – The amount of time elapsed since the phase center was at zenith. Assumed to be in days unless otherwise defined. May be negative.
- Returns:
An array the same shape as
baselines_metres
, but phased to thenew phase centre.