Abstract:
A method and apparatus for assisting a determination of a position of a receiver (1210, 1230) and/or a time at the receiver. The method comprises: receiving (1110) at the receiver (1210, 1230) a first radio signal transmitted at a first frequency by a first transmitter (110);receiving (1120) at the receiver (1210, 1230) a second radio signal transmitted at a second frequency by a second transmitter (120), wherein the second transmitter (120) is at a different location from the first transmitter (110) and the second frequency is different from the first frequency; comparing (1130) a first phase of the received first radio signal with a second phase of the received second radio signal to produce a phase-comparison; and using (1150, 1160) the phase-comparison to assist in the calculation of the position of the receiver and/or the time at the receiver. Also provided are a method and apparatus for producing calibration for use in the above determination, and a method for providing such calibration from a database. Further provided are a method and apparatus for assisting in a determination of a location of (and/or time at) a transmitter, based on the same principles as the above.
Abstract:
A real-time kinematic (RTK) filter (48) uses the backup data to estimate a relative position vector between the mobile receiver (20) at the first measurement time and the mobile receiver (20) at the second measurement time and to provide recovery data associated with a satellite-differenced double-difference estimation for the mobile receiver (20) between the first measurement time and the second measurement time. A navigation positioning estimator (50) can apply the relative position vector, the backup data, the recovery data from the RTK filter (48), and received correction data with precise clock and orbit information on the satellite signals, as inputs, constraints, or both for convergence or resolution of wide-lane and narrow-lane ambiguities, and determination of a precise position, in accordance with a precise positioning algorithm.
Abstract:
Die Erfindung betrifft ein Verfahren zum Auswählen von Lokalisierungsalgorithmen in einem Fahrzeug, wobei die Lokalisierungsalgorithmen, insbesondere für Satellitennavigation oder Fahrdynamiksensoren, basierend auf Fahrzuständen ausgewählt werden.
Abstract:
A system or method uses an offset vector to provide seamless switching between a real-time kinematic (RTK) mode and a precise positioning mode. A correction wireless device (14, 114, 214) is adapted to receive, at the reference receiver (30), a precise signal encoded with precise correction data. A precise positioning estimator (120) of the reference receiver (30) is arranged to determine a precise position based on the measured carrier phase of the received satellite signals and the received precise correction data in a precise correction mode. At the reference receiver (30), an offset module (130) can determine a base offset vector between the precise position and a reference RTK position for the reference receiver (30). At the reference receiver (30), a wireless communications device (14, 114, 214) is capable of transmitting, via an RTK signal, RTK correction data.
Abstract:
A method for contextual inference of user activity is disclosed. In one embodiment, an indication of the motion of a pole mounted sensing device comprising at least one motion sensor and a Global Navigation Satellite System (GNSS) receiver configured to at least generate raw GNSS observables is received from the at least one motion sensor. The indication of the motion of the pole mounted sensing device is correlated with an operation defined in a gesture library regarding GNSS data collect by the GNSS receiver at a time when the indication of the motion is detected. The indication and the GNSS data are stored.
Abstract:
Systems and methods for performing land surveying using real-time kinematic (RTK) engine verification are provided. In one example, a first set of positions of a GNSS receiver may be determined using each of a plurality of RTK engines. If a number of the plurality of RTK engines that produce a fixed solution is greater than or equal to a threshold value, a position of the GNSS receiver may be determined based on at least a portion of the first set of positions. The determined position may then be stored. This process may be repeated any number of times to produce a desired number of stored positions. In response to the number of stored positions being equal to a minimum value, a final position of the GNSS device may be determined based on the stored positions.