*p*_{r,f} | (*m* −1)× 1 | SD code observations of antenna *r*, frequency *f* |

*φ*_{r,f} | (*m* −1)× 1 | SD phase observations of antenna 1, frequency *f* |

*P*_{r} | *f*(*m* −1)×1 | SD code observations of antenna *r* |

Φ_{r} | *f*(*m* −1)×1 | SD phase observations of antenna *r* |

*y*_{r} | 2*f*(*m* −1)× 1 | All SD observations of antenna *r* |

| *f*(*m* −1)×1 | DD code observations of antennae 1 and 2 |

| *f*(*m* −1)×1 | DD phase observations of antennae 1 and 2 |

*Y* | 2*f*(*m* −1)×(*a* −1) | All DD observations of the array |

*vec*[*y*_{r}, *Y*] | 2*f*(*m* −1)*a* × 1 | Observation set of the A-POAD model |

*vec*(*Y*_{r}) | 2*f*(*m* −1)*a* × 1 | All SD observations in *vec* form |

| 3 × 1 | Unit-direction vector to satellite *s* |

*G* = *G*_{r} | 2*f*(*m* −1)× 3 | Geometry component of the design matrix |

*A* | 2*f*(*m* −1)× *f*(*m* −1) | Ambiguity component of the design matrix |

*Q*_{p} | *m* × *m* | Covariance matrix of undifferenced code observations |

*Q*_{ϕ} | *m* × *m* | Covariance matrix of undifferenced phase observations |

| (*m* −1)×(*m* −1) | Covariance matrix of DD code observations |

| (*m* −1)×(*m* −1) | Covariance matrix of DD phase observations |

*Q*_{r} | *a* × *a* | Covariance matrix of the array (array precision) |

*Q*_{f} | *f* × *f* | Contribution of frequencies |

*Q*_{vec}[*y*_{r}, *Y*] | 2*f*(*m* −1) *a* × 2*f*(*m* −1)*a* | Covariance matrix of the A-POAD model |

*Q*_{Y} | 2*f*(*m* −1)(*a* −1)× 2*f*(*m* −1)(*a* −1) | Covariance matrix of DD observations |

*z*_{r} | *f*(*m* −1)×1 | All SD observations of antenna *r* |

*Z* | *f*(*m* −1)×(*a* −1) | All DD observations of the array |

*B* | 3×(*a* −1) | All baselines (considering one antenna as reference) |

∇ | (*m* −1)× 2*m* | DD operator |

| (*i*+1)× *i* | Differencing matrix |

*e*_{i} | 1 × *i* | Row vector with elements equal to 1 |

*I*_{i} | *i* × *i* | Identity matrix |

*c*_{1} | (*i* +1)×1 | Column vector in which the first element equals 1 and the remainder equal 0 |