Abstract: Methods and systems find position solutions using GNSS carrier phase. A plurality of integer cycle ambiguity candidates associated with the carrier phase are found as a function of corrected carrier phases. Positions and position error estimates are derived from the plurality of integer cycle ambiguity candidates.

Abstract: A differential carrier phase global navigation satellite system (GNSS) receiver with multiple antennas uses multiple GNSS carriers to determine position, which can improve the speed of integer searches, for example. In the system, an estimate of delays associated with the transmission paths between the antennas and receiver for at least one of the GNSS frequencies is stored. Typically, these are measures of the phase delay in the transmission paths for two or more of the GNSS frequencies such as in fractional cycles of the GNSS frequencies. Having this information solves problems associated with using multiple carrier frequencies. While cable delays typically have a fixed time delay, the signal paths for the different frequencies are not completely common—even if they were perfectly matched in time, the number of fractional cycles would still be different. Thus, the number of cycles a radio frequency (RF) signal is delayed is different for different frequencies.

Abstract: A system and method for compensating for changes in relative antenna attitude in a single-receiver position detection system, such as a differential carrier phase GPS system, utilizes sensor input to detect changes in the relative attitude of at least two antennas or an antenna positioner, such as an motorized actuator or operator, that orients or re-orients the antennas to a predetermined orientation. The changes in the detected relative carrier phase due to the right hand circular polarized nature of the carrier signals are thus corrected. In this way, the high positional accuracy associated with kinematic GPS systems, for example, can be achieved even when the system's antennas are not constrained by a common rigid body, for example.

Abstract: A number of solutions for deriving the line bias are disclosed. Some of these solutions utilize signal processing and judicious selection of the frequency plan used in the position detection systems to either enable the derivation of the line bias, or make the measurements insensitive to line bias. In other examples, the present invention utilizes measurement schemes for deriving the line bias and enabling a position detection system to process line bias information in order to find a position solution.

Abstract: A global navigation satellite system (GNSS) receiver system includes a processing unit; and one or more antenna units for receiving GNSS signals, each of the antenna units having a phase center; one or more inertial sensor units each positioned substantially adjacent the phase centers; and at least one communication channel between each antenna unit and the processing unit.