GNSS reflectometry

GNSS reflectometry is passive sensing that takes advantage of and relies on multiple active sources - with the satellites generating the navigation signals.

The surface area of the reflected GNSS signal also provides the two parameters time delay and frequency change.

The shape and power distribution of the signal within the DDM is dictated by two reflecting surface conditions: its dielectric properties and its roughness state.

GNSS reflectometry is a bi-static radar, where transmitter and receiver are separated by a significant distance.

As a GNSS satellite rises or sets, the elevation angle changes; the direct and reflected signals will generate an interference pattern.