Javad Gnss Inc. | Date: 2014-05-09
Systems and methods for synchronizing a global navigation satellite system (GNSS) receiver with a GNSS signal are provided. In one example, a GNSS receiver may include one or more sets of 20 GNSS channels that are each configured to integrate a received GNSS signal over a 20 millisecond accumulation window to output a navigation message bit. The accumulation windows of the 20 GNSS channels may be delayed relative to other windows of the 20 GNSS channels by 1 millisecond. The GNSS receiver may identify one of the 20 GNSS channels having the correct synchronization with the GNSS signal based on the navigation message bits output by the 20 GNSS channels. The identified GNSS channel having the correct synchronization with the GNSS signal may be used to determine a location of the GNSS receiver.
JAVAD GNSS Inc. | Date: 2014-02-20
Systems and methods for performing aerial photography and/or photogrammetry are provided. In one example, a path to be followed by an aerial vehicle may be generated based on a path traversed by a ground vehicle. The path to be followed by the aerial vehicle may be a path that is vertically and laterally offset from the path traversed by the ground vehicle. The path traversed by the ground vehicle may be transmitted by the ground vehicle to the aerial vehicle. Alternatively, the aerial vehicle may determine the path traversed by the ground vehicle by identifying the ground vehicle within images generated by the aerial vehicle. While the aerial vehicle traverses the path to be followed, the aerial vehicle may generate and store images of the ground or other points of interest. A photogrammetry process may be performed on an object of interest using the images generated by the aerial vehicle.
Determining positions for a set of points using a GNSS rover unit includes receiving a correction signal from a GNSS base unit. The GNSS base unit is located at a fixed point. The correction signal is used to determine a position of a point of the set of points. The position is stored in memory of the GNSS rover unit as position data. These steps are repeated for each point in the set of points. Raw GNSS data of the GNSS base unit is transmitted to the server system. A corrected position of the GNSS base unit is received from the server system. The position data is translated based on the corrected position of the GNSS base unit to produce adjusted position data.
A method for using a GNSS device to determine a position of an unknown point includes determining positions of a first point, a second point, and a third point using the GNSS device. A first image is captured of the first point using an image sensor, the image includes the unknown point and at least one of the second point or the third point. A second image is captured from the second point; the second image includes the unknown point and at least one of the second point or the third point. A third image is captured from the third point; the third image includes the unknown point and at least one of the second point or the first point. A position of the unknown point is calculated based on the first, second, and third images and the first, second, and third positions.
Documenting the two-dimensional tilt of a GNSS device includes focusing an image sensor on a location of a level having an appearance that indicates the two-dimensional tilt of the GNSS device. A first image of a scene is captured with the image sensor. The first image includes the level. A portion of the first image is displayed and includes the level on a display of the GNSS device. Position information for the GNSS device is also displayed on the display.
JAVAD GNSS Inc. | Date: 2014-10-07
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.
JAVAD GNSS Inc. | Date: 2015-07-30
A graphics-aided geodesic device is provided. The device includes an antenna for receiving position data from a plurality of satellites and a receiver coupled to the antenna. The device further includes orientation circuitry for obtaining orientation data. The orientation data represents an orientation of the apparatus with respect to a plane parallel with a horizon. The device further includes positioning circuitry for determining the position of the point of interest based at least on the position data and the orientation data. A function of the graphics-aided geodesic device may be activated in response to a distance sensor detecting that an object is within a threshold distance from the device.
JAVAD GNSS Inc. | Date: 2014-10-02
Systems and methods for performing automated localization are provided. In one example method, a plurality of coordinates representing positions of a plurality of locations may be received. The plurality of coordinates may be from two or more different coordinate systems. The numerical values of each of the plurality of coordinates may be evaluated to determine the coordinate system to which the coordinate belongs. The coordinates may be grouped into sets of coordinates based on their determined coordinate systems. Coordinates from one coordinate system may be paired with coordinates that represent the same locations from another coordinate system. A shape matching algorithm may be used to determine coordinates from different systems that represent the same locations. A localization process may then be used to convert the coordinates of the first coordinate system into coordinates of the second coordinate system based on the paired coordinates.
Javad Gnss Inc. | Date: 2013-09-19
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.
JAVAD GNSS Inc. | Date: 2015-07-17
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.