Abstract

An exemplary method of calculating a position of a GNSS device (e.g., a GNSS rover device) comprises: at the GNSS device in an enhanced real-time kinematic (RTK) mode: receiving a first set of GNSS data corresponding to a first epoch; storing the first set of GNSS data in a buffer; receiving a second set of GNSS data corresponding to a second epoch that is after the first epoch; after receiving the second set of GNSS data, retrieving the first set of GNSS data from the buffer; and calculating the position of the GNSS device based on the retrieved first set of GNSS data and the second set of GNSS data.

IPC Classes  ?

• G01S 19/09 - Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers providing processing capability normally carried out by the receiver
• G01S 19/43 - Determining position using long or short baseline interferometry

Abstract

Systems and methods for performing spoofing detection and rejection including receiving (602), at a Global Navigation Satellite System (GNSS) device having an antenna, a set of signals, identifying (604) a questionable signal in the set of signals, and in accordance with a determination that the set of signals includes a subset of valid GNSS satellite signals (620), where the subset satisfies a minimum number of valid GNSS satellite signals and does not include the questionable signal, calculating an approximate position of the GNSS device based on the subset of valid GNSS satellite signals.

IPC Classes  ?

• G01S 19/21 - Interference related issues
• G01S 19/42 - Determining position

Abstract

Systems and methods are provided for verifying a location of a global navigation satellite system (GNSS) base station or rover. In one example, a method for verifying a location of a GNSS base station includes measuring velocity of the GN SS base station, determining movement of the GNSS base station based on the measured velocity, and, in response to determining movement of the GNSS base station, transmitting a movement alert to a GNSS rover.

IPC Classes  ?

• G01S 19/07 - Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers providing data for correcting measured positioning data, e.g. DGPS [differential GPS] or ionosphere corrections
• G01S 19/41 - Differential correction, e.g. DGPS [differential GPS]
• G01S 19/43 - Determining position using long or short baseline interferometry

Abstract

Embodiments of the present disclosure relate to a magnetic locator (500) for a GNSS device (604). The magnetic locator includes a magnetic field sensor configured to detect a magnetic field adjacent the magnetic locator; a controller coupled to the magnetic field sensor and configured to receive from the magnetic field sensor measurement data based on the magnetic field and calculate sensor data based on the received measurement data; a communication interface coupled to the controller and adaptable to transmit sensor data received from the controller to the GNSS device; a connector adaptable to connect the magnetic locator to a GNSS antenna of the GNSS device; and a housing.

IPC Classes  ?

• G01S 19/45 - Determining position by combining measurements of signals from the satellite radio beacon positioning system with a supplementary measurement
• G01C 15/06 - Surveyors' staffs; Movable markers

Abstract

A GNSS deice includes executable instructions for several steps, A first algorithm is executed to determine first position data for the GNSS device based on the first plurality of GNSS signals and a correction signal received at the GNSS device from the GNSS base unit. The first position data is stored memory of the GNSS device. A second algorithm is executed to determine second position data for the GNSS device based on the second plurality of GNSS signals. In response to the second algorithm failing to determine the second position data, GNSS signal data is stored in memory of the GNSS device. The GNSS signal data is based on the second plurality of GNSS signals. The GNSS signal data are transmitted to an external device.

IPC Classes  ?

• G01S 19/09 - Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers providing processing capability normally carried out by the receiver
• G01S 19/41 - Differential correction, e.g. DGPS [differential GPS]
• G01S 19/42 - Determining position

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.

IPC Classes  ?

• G01S 19/43 - Determining position using long or short baseline interferometry
• G01S 19/42 - Determining position
• G01S 19/44 - Carrier phase ambiguity resolution; Floating ambiguity; LAMBDA [Least-squares AMBiguity Decorrelation Adjustment] method

Abstract

Systems and methods for aggregating interference data and generating visual representations of the interference data are provided. In one example method, interference data may be received from multiple GNSS receivers positioned at various geographical locations. A request for a visual representation of interference at a location may be received. In response to the request, a visual representation of interference at the requested location may be generated based on at least a portion of the received interference data. The visual representation may include a map overlaid with visual indicators of interference indicating a location and magnitude of the interference. The visual representation of interference at the requested location may then be transmitted to a computing device requesting the representation.

IPC Classes  ?

• G01S 19/03 - Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers
• G01S 19/21 - Interference related issues

Abstract

Low-noise amplifier (LNA) filters and processes for filtering global navigation satellite system (GNSS) signals are disclosed. The LNA filters can be used to down-convert a received GNSS signal to a lower frequency, filter the GNSS signal at the lower frequency, and up-convert the GNSS signal to the original frequency of the GNSS signal. The down-converted frequency can be selected based on a temperature of the GNSS signal to compensate for shifts in the frequency response of the filter due to temperature changes.

IPC Classes  ?

• G01S 19/21 - Interference related issues
• G01S 19/36 - Constructional details or hardware or software details of the signal processing chain relating to the receiver frond end

Abstract

Systems and methods for detecting and displaying cycle slips are provided. In one example method, a first L1 signal and a second L2 signal may be received. The coarse/acquisition code from the L1 signal may be extracted and may be monitored to detect a phase shift in the code. In response to detecting a phase shift in the code, a data bit of the L1 signal may be monitored for a predetermined length of time to detect a change in the data bit. A cycle slip may be detected in response to detecting a change in the data bit during the predetermined length of time. In another example, a cycle slip may be detected in response to detecting a change between a phase of the LI signal and a phase of the L2 signal.

IPC Classes  ?

• G01S 19/43 - Determining position using long or short baseline interferometry
• G01S 19/32 - Multimode operation in a single same satellite system, e.g. GPS L1/L2

Abstract

A low-noise amplifier (LNA) filter for use with global navigation satellite system (GNSS) devices is disclosed. A first LNA stage, which is configured to connect to an antenna configured to receive GNSS signals, includes an LNA. A second LNA stage, which is connected to the output of the first LNA stage, has a surface acoustic wave (SAW) filter and an LNA. A third LNA stage, which is connected to the output of the second LNA stage, also has a SAW filter and an LNA.

IPC Classes  ?

• H04B 1/18 - Input circuits, e.g. for coupling to an antenna or a transmission line

Abstract

The position of a global navigation satellite system (GNSS) surveying receiver is determined based on a plurality of RTK engines. A first RTK engine is implementing using a first set of parameters. A second RTK engine is implemented using a second set of parameter different than the first set. A plurality of GNSS signals are received from multiple satellites. At least one correction signal is received from at least one base receiver. A first position is determined from the first RTK engine based on the GNSS signals and the at least one correction signal. A second position is determined from the first RTK engine based on the GNSS signals and the at least one correction signal. A final position of the GNSS surveying receiver is determined based on the first position or the second position or a combination of both positions.

IPC Classes  ?

• G01S 19/39 - Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system the satellite radio beacon positioning system transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO