Abstract: Described herein are systems, methods, and other techniques for selecting satellite signals for tracking at a GNSS receiver. A set of satellite signals are received via a GNSS antenna. Each of the set of satellite signals belongs to one of at least one GNSS constellation, operates within one of a set of frequency bands, and has one of a set of signal types. A correction signal is received at the GNSS receiver from a base station. The correction signal includes correction data for a subset of the set of satellite signals. While operating in accordance with a signal selection mode, the subset of the set of satellite signals are selected to be included in a set of active signals to be tracked by the GNSS receiver. Each satellite signal in the set of active signals is tracked using hardware elements of the GNSS receiver.

Abstract: This disclosure relates to a telescope and to a method of manufacturing a telescope. The telescope (100) comprises a telescope body (101), a front lens (102) having a centre axis (A), a reticle (107) for determining a sighting axis of the telescope (100), and an image erecting prism (106) arranged between the front lens (102) and the reticle (107). The front lens (102) is connected to the telescope body (101). The reticle (107) is arranged such that light entering the telescope (100) through the front lens (102) along the centre axis (A) passes through the centre of the reticle (107). The image erecting prism (106) is connected to the telescope body (101) through an interface (200a; 200b) defining an attachment point (AP), said attachment point (AP) being positioned on the centre axis (A) of the front lens (102), and the reticle (107) is mounted to the image erecting prism (106).

Abstract: A system for surveying includes, a base station, for being positioned with respect to an environment, and an augmented-reality device. The augmented-reality device, such as a head-mounted display, has one or more cameras. An image of the base station is acquired by at least of the one or more cameras. An offset from the augmented-reality device to the base station is calculated based on the image. A position of the augmented-reality device with respect to the environment is calculated based on the offset and the base station positioned with respect to the environment. A virtual object in relation to the environment can then be presented to a user, using the augmented-reality device.

Abstract: A method of verifying accuracy of a perception system of a vehicle includes causing the vehicle to traverse a path around a target that is fixed in an environment. The target has a known pose. The path is configured so that the target comes into a respective field of view (FOV) of each respective perception sensor of one or more perception sensors of the perception system along the path. The method further includes, for each respective perception sensor of the one or more perception sensors, while the target is within the respective FOV of the respective perception sensor, acquiring a respective image of the target using the respective perception sensor; at the perception system, determining a respective pose of the target based on the respective image; and at a computer system communicatively coupled with the perception system, determining whether the respective pose matches the known pose of the target.

Abstract: Some embodiments of the invention pertain to methods for determining whether an object is in a liquid-surface-wave-influenced environment, such as for example in a ferry. The method comprises: acquiring (s10) measurement data, here referred to as “inertial data”, from an inertial measurement unit (IMU) rigidly mounted with respect to the object; determining (s20) a value, here referred to as “autocorrelation function minimum's lag value”, representing a lag at which an autocorrelation function of the acquired inertial data is minimum; and determining (s30) whether the object is in a liquid-surface-wave-influenced environment based on the autocorrelation function minimum's lag value. The disclosure also relates to, without being limited to, systems (1200), vehicles, computer programs, and computer program products.

Abstract: Described herein are systems, methods, and other techniques for detecting GNSS position outliers. GNSS observables are generated based on satellite signals received at a GNSS receiver. A position estimate is computed based on the GNSS observables. A set of code biases for the set of satellite signals are generated based on the position estimate and the GNSS observables. A set of code bias deviations for the set of satellite signals are computed as a difference between, for each of the set of satellite signals, a code bias of the set of code biases and a code bias model of a set of code bias models. A position error estimate is computed based on the set of code bias deviations.

Abstract: A scanning surveying system includes a base, an alidade mounted on the base an rotatable relative to the base about a first axis, a first motor that can rotate the alidade relative to the base, a rotating optical element coupled to the alidade and rotatable relative to the alidade about a second axis, a second motor that can rotate the rotating optical element relative to the base, an optical distance measuring unit, a sensor that can detect a motion of the scanning surveying system, and a controller. The controller can control the optical distance measuring unit (i) to perform stationary scanning operations and (ii) to automatically execute mobile scanning operations in response to a detection of motion of the scanning surveying system by the sensor.

Abstract: Techniques are described for generating point clouds of a site. A laser scanner of an onsite device captures scan data of the site. A GNSS receiver of the onsite device captures GNSS position data. A georeferenced point cloud including a plurality of points is generated using the scan data and the GNSS position data. The georeferenced point cloud is segmented using a trained machine learning model by assigning the plurality of points to a set of classes including a noise class and one or more non-noise classes to produce a segmented point cloud. A portion of the segmented point cloud assigned to the one or more non-noise classes is wirelessly transmitted to an offsite device that is remote from the site. The portion of the segmented point cloud is stored at the offsite device in an accumulated point cloud for subsequent processing at the offsite device.

Abstract: A parasitically-coupled dual-band patch antenna is described. The antenna includes an inner conductor having one or more feed holes. The antenna also includes an outer conductor surrounding the inner conductor in a radial direction. The antenna further includes one or more feeds each having a vertical portion that passes through the feed holes and a horizontal portion that extends in an outward direction from the feed holes toward the outer conductor. The feeds are conductively connected to the outer conductor. The horizontal portion of each of the feeds is separated from and is conductively disconnected from a top surface of the inner conductor.

Abstract: Methods, controllers and computer program products for efficient utilization of a surveying instrument are provided. The surveying instrument may perform different types of data collection tasks, at least one of which includes measuring a direction and/or a distance to a target. The surveying instrument is controlled to perform one or more data collection tasks in accordance with a queue of one or more data collection tasks. The queue includes a data collection task of at least one of the different types of data collection tasks. During an ongoing data collection task or during an ongoing sequence of data collection tasks, an instruction is received. The instruction indicates an additional data collection task to be performed by the surveying instrument in addition to the one or more tasks already in the queue. The surveying instrument is controlled to perform data collection tasks in an order determined based on the queue and the received instruction.

Abstract: A target for use in surveying applications is provided. The target comprises a plurality of light sources arranged around a longitudinal axis (A) of a base element of the target. The plurality of light sources is configured to emit light radially. The target further comprises a control unit. The control unit is configured to receive, from a surveying instrument aimed towards the target, an input indicative of a distance (d) between the target and the surveying instrument. The control unit is further configured to control an intensity of the light emitted by the plurality of light sources based on the input indicative of the distance between the target and the surveying instrument.

Abstract: The present inventive concept relates to a system (1) comprising: a total station (10) comprising a center unit (100) mounted on an alidade (110) for rotation about a first axis (A1), wherein the alidade (110) is mounted on a base (120) of the total station (10) for rotation about a second axis (A2) orthogonal to the first axis (A1), whereby a sighting axis (A3) of the total station (10) is rotatable about a rotation point; and an optical calibration element (12) connectable to the total station (10) or a support (130) on which the total station (10) is installed; and wherein the optical calibration element (12) in a connected state is arranged such that, when the sighting axis (A3) is rotated about the rotation point to form a non-zero calibration angle (B) relative to a plane having a normal parallel to the second axis (A2), the center unit (100) is aimed toward a target (14) via the optical calibration element (12).

Abstract: A scanning surveying system includes a base, an alidade mounted on the base an rotatable relative to the base about a first axis, a first motor that can rotate the alidade relative to the base, a rotating optical element coupled to the alidade and rotatable relative to the alidade about a second axis, a second motor that can rotate the rotating optical element relative to the base, an optical distance measuring unit, a sensor that can detect a motion of the scanning surveying system, and a controller. The controller can control the optical distance measuring unit (i) to perform stationary scanning operations and (ii) to automatically execute mobile scanning operations in response to a detection of motion of the scanning surveying system by the sensor. The controller can also register point cloud data from the stationary scanning operations and/or the mobile scanning operations.

Abstract: Some embodiments of the invention pertain to generating and transmitting information suitable for use in contributing to computing a positioning solution based on navigation satellite system (NSS) signals received by a NSS receiver, to minimize multipath and atmospheric errors in the resulting positioning solution so as to increase its accuracy. The method involves a plurality of reference stations 100, 200 comprising a primary reference station 100 and at least one secondary reference station 200. Systems and computer programs are also disclosed.

Abstract: Described herein are systems, methods, and other techniques for performing conflation between target road polylines and source road polylines stored in GIS databases. A pairing of a target road polyline and a source road polyline is obtained. The target road polyline and the source road polyline each include a sequence of connected 2D or 3D vertices that form a continuous line. A similarity score is computed between the target road polyline and the source road polyline based on one or more similarity metrics. A conflation classification is assigned to the target road polyline, the source road polyline, or the pairing based on the similarity score. The conflation classification is one of a set of possible conflation classifications. A post-classification action is performed based on the conflation classification.

Abstract: Described herein is a baseband circuit and a method of operation thereof for use in a GNSS receiver to mitigate jamming and other interference. The baseband circuit may include a time-domain interference mitigation (TDIM) circuit and a frequency-domain interference mitigation circuit (FDIM) for each of multiple RF paths. The TDIM circuit may include a set of notch filters. A processor coupled with the baseband circuit may compute a direct Fourier transform of digital samples of received satellite signals, generate a set of control parameters based on the DFT of the digital samples, and adjust the TDIM and FDIM circuits using the set of control parameters. The set of control parameters may include filter coefficients for the set of notch filters to reject multiple narrow-band interferers.

Abstract: Some embodiments of the invention pertain to methods carried out by a navigation satellite system (NSS) receiver for estimating parameters useful to determine a position. The receiver observes signals from satellites. Delta carrier phase observables are computed by subtracting observables of different epochs. An estimator uses state variables and computes their values based on the computed delta carrier phase observables. A synthetic carrier phase observable for an anchor epoch is generated, for each carrier phase observable of a terminus epoch for which one of the following applies: (i) a change in phase ambiguity occurred with respect to the corresponding carrier phase observable of the anchor epoch, and (ii) no corresponding carrier phase observable was tracked at the anchor epoch. Generated synthetic carrier phase observables are used to compute delta carrier phase observables between the anchor epoch and an epoch subsequent to the terminus epoch. Systems and vehicles are also disclosed.

Abstract: Some embodiments pertain to methods carried out by a navigation satellite system (NSS) receiver for estimating parameters useful to determine a position. The receiver observes NSS signals from NSS satellites. Multipath-related information indicative of an expected or estimated level of multipath where the NSS receiver antenna(s) is located is obtained. A positively skewed distribution is then determined based on the multipath-related information. Further, an estimation process, referred to as “estimator”, is operated, wherein the estimator uses state variables, computes the values of its state variables based on NSS code observations by the NSS receiver, and operates under an assumption that errors in the NSS code observations follow the determined skewed distribution. Systems, vehicles, and computer programs are also disclosed.

Abstract: A computer implemented method is presented, the method comprising: collecting feature data comprising a plurality of features, each feature associated with a model of one or more models and a value; generating a machine learning model by performing feature selection on the feature data to select a chosen feature space comprising a subset of the plurality of features, wherein the subset of the plurality of features comprises one or more additional feature, wherein the value associated with each of the one or more additional feature in the chosen feature space is set to zero; training the machine learning model using the one or more values associated with the one or more features of the subset of the plurality of features; detecting a user initiated change affecting the chosen feature space.

Abstract: There is provided a control unit for a surveying instrument having a base mounted on a support structure and a main body rotatable in relation to said base. The control unit is configured to produce a fused angle signal representative of an angular position of said main body relative to an external reference, and to provide a control signal for rotating said main body. The control unit further comprises: a resonance frequency finder configured to estimate at least one resonance frequency associated with said support structure, and a filter component configured to selectively apply at least one filter on said control signal, said fused angle signal, or said first angle signal, wherein an applied filter is configured to filter out a corresponding respective resonance frequency estimated by said resonance frequency finder. There is also provided a surveying instrument comprising such a control unit, and a method for controlling a surveying instrument.