# `Sidereon.GNSS.ARAIM.ConstellationIsm`
[🔗](https://github.com/neilberkman/sidereon-ex/blob/main/lib/sidereon/gnss/araim.ex#L272)

Per-constellation ARAIM ISM defaults.

`:p_const` is the constellation-wide fault prior. The default satellite
model uses meters for sigma and bias fields.

# `t`

```elixir
@type t() :: %Sidereon.GNSS.ARAIM.ConstellationIsm{
  default_sat: Sidereon.GNSS.ARAIM.SatelliteIsmModel.t(),
  p_const: float(),
  system: String.t()
}
```

# `new`

```elixir
@spec new(atom() | String.t(), number(), Sidereon.GNSS.ARAIM.SatelliteIsmModel.t()) ::
  t()
```

Build a per-constellation ISM record.

---

*Consult [api-reference.md](api-reference.md) for complete listing*