GNSS receiver adapted to fix cross-GNSS DD ambiguity

A receiver for processing satellite signals with integer cross ambiguity resolution, comprising:

• a processor;
• a cross ambiguity fixing module provided by the processor executing code to generate an error correction;
• and
• an estimator provided by the processor executing code to provide a geographical position solution by processing signals from a set of GNSS satellites along with the error correction and with receiver data received from a spaced-apart GNSS receiver, wherein the geographical position solution is obtained by the estimator performing double difference (DD) processing to resolve integer ambiguity, wherein the error correction includes a search space for use in DD processing by the estimator, and wherein the search space includes a greater number of DD ambiguities than a conventional Real-Time Kinematic (RTK) search space or a Precise Point Positioning (PPP) search space;
• and
• memory storing an error correction lookup table storing error correction values for a plurality of pairs of receiver types,
• wherein the data from the spaced-apart GNSS receiver includes a definition of a type of GNSS receiver, and
• wherein the cross ambiguity fixing module generates the error correction by retrieving one of the error correction values based on the definition of the type of GNSS receiver and on a type of the receiver.

A method for processing satellite signals with integer cross ambiguity resolution, comprising:

• receiving signals from a set of Global Navigation Satellite System (GNSS) satellites, wherein the receiving step is performed by a first receiver of a first type and a second receiver of a second type differing from the first type;
• constructing a search space comprising a set of DD carrier-phase ambiguities;
• and
• performing integer ambiguity resolution by processing the search space, wherein the constructing step includes enlarging, prior to the performing of the integer ambiguity resolution step, the search space by performing one of the following steps:
• selecting a common reference satellite for different pairs of the received signals from the set of GNSS signals;
• and including in the search space DD ambiguities between reference satellites that correspond to the received signals from the set of GNSS satellites;
• deriving misalignment values from a database of receiver alignment data, wherein the misalignment values between the first and second receivers are 0.0, 0.25, −0.25, or 0.5;
• searching on a quarter-cycle grid to account for a potential quarter-cycle misalignment and to provide an ambiguity resolution;
• and
• when the ambiguity resolution is successfully determined in the searching on the quarter-cycle grid, applying the misalignment values to the received signals from the GNSS satellites prior to performing the integer ambiguity resolution.