Method and system for second node supported ambiguity decision

A method for improving decision-making on fixing integer ambiguity in phase-based measurements for or between signals of a transmitter(S) or for or between round trip signals based on the signals from the transmitter(S), the method comprising:

• providing an arrangement of at least two nodes, said nodes each having at least one antenna and at least one frequency generator and each being configured to receive radio signals and to determine phases or relative phases of the radio signals, wherein the at least two nodes are configured to communicate with one another or with a common central unit and are arranged at a distance from one another;
• transmitting at least one radio signal of the radio signals comprising at least two signals by the transmitter;
• receiving the at least one radio signal by the at least two nodes;
• performing at least one phase measurement per radio signal by each node of the at least two nodes;
• taking at least two individual preliminary decisions for fixing the integer ambiguity comprising at least a first individual preliminary decision and a second individual preliminary decision,
• wherein
• i) the first individual preliminary decision is taken for the least one radio-signal being received at a first node of the least two nodes and the second individual preliminary decision is taken for the least one radio-signal being received at a second node of the least two nodes or
• ii) the first individual preliminary decision is taken for a first round trip signal based on the least one radio-signal and via the first node and the second individual preliminary decision is taken for a second round trip signal based on the least one radio-signal and via the second node;
• and
• taking a joint decision for fixing the integer ambiguity by aggregating the at least two preliminary decisions for fixing the integer ambiguity, said joint decision being applied for the at least one radio-signal being received at any node of the at least two nodes or for each round trip signal based on the at least one radio signal and via any node of the at least two nodes.