Abstract: A method and system of improving Global Navigation Satellite System (GNSS) results by compensating for antenna tilt in determining the location of the GNSS receiver is disclosed. In general, the angle of tilt of the antenna is determined. The actual elevation of a satellite is determined. The effective elevation of the satellite relative to the antenna is then calculated.

Abstract: A method and system of improving Global Navigation Satellite System (GNSS) results by compensating for antenna tilt in determining the location of the GNSS receiver is disclosed. In general, the angle of tilt of the antenna is determined. The actual elevation of a satellite is determined. The effective elevation of the satellite relative to the antenna is then calculated.

Abstract: A method and system for variable data rate transmission in a real-time kinematic (RTK) positioning system. An RTK positioning system having a reference station and a rover utilizes wireless communications for data transfer. The data transmission rate between the reference station and the rover is dynamically controlled by a programmable transmission controller. The transmission rate is determined on the basis of specific parameters. Parameters that may be used to determine the data transmission rate include rover demand, required rover accuracy, satellite positioning system (SATPS) events, the required data for ambiguities, and the type and content of the data transmitted.

Abstract: A method and system for variable data rate transmission in a real-time kinematic (RTK) positioning system. An RTK positioning system having a reference station and a rover utilizes wireless communications for data transfer. The data transmission rate between the reference station and the rover is dynamically controlled by a programmable transmission controller. The transmission rate is determined on the basis of specific parameters. Parameters that may be used to determine the data transmission rate include rover demand, required rover accuracy, satellite positioning system (SATPS) events, the required data for ambiguities, and the type and content of the data transmitted.

Abstract: A method and system for variable data rate transmission in a real-time kinematic (RTK) positioning system. An RTK positioning system having a reference station and a rover utilizes wireless communications for data transfer. the data transmission rate between the reference station and the rover is dynamically controlled by a programmable transmission controller. The transmission rate is determined on the basis of specific parameters. Parameters that may be used to determine the data transmission rate include rover demand, required rover accuracy, satellite positioning system (SATPS) events, the required data for ambiguities, and the type and content of the data transmitted.

Abstract: A survey system and method for determining the best source of position data for a particular application. The system includes both an optical unit and a satellite positioning system (SATPS) unit for obtaining position data. The optical unit includes a theodolite and an electronic distance meter for determining the position of a rover unit. The SATPS unit includes a SATPS antenna and a SATPS receiver for receiving signals from satellites of the SATPS and a radio for coupling the received signals to the rover unit. The present invention automatically determines the best source of position data. The best source of position data is then used to calculate the position of the rover unit.

Abstract: A survey system and method for determining the best source of position data for a particular application. The system includes both a satellite positioning system (SATPS) and a non-SATPS unit for obtaining position data. The SATPS unit includes a SATPS antenna and a SATPS receiver for receiving signals from satellites of the SATPS and a radio for coupling the received signals to the rover unit. Data is collected using both the SATPS and non-SATPS methods to obtain a master data set. Data is selected and/or combined from the master data set to produce the data subset required for position determination. The basic SATPS method may also be augmented by the use of one or more reference stations at known locations.

Abstract: A system and method for selecting at least one target with strong reflectivity from a set of strong and weak reflectors by using an amplitude of a reflected signal to make such a selection. The pre-computed look-up table that relates an amplitude of the reflected signal from a target with a strong reflectivity to the distance at which such target is located is used in a real-time mode to separate weak reflectors from strong reflectors. In the post-processing mode the usage of normalizing function allows to further differentiate between strong reflectors (like windows) and very strong reflectors (like prisms).

Abstract: A survey system and method for determining the best source of position data for a particular application. The system includes both an optical unit and a satellite positioning system (SATPS) unit for obtaining position data. The optical unit includes a theodolite and an electronic distance meter for determining the position of a rover unit. The SATPS unit includes a SATPS antenna and a SATPS receiver for receiving signals from satellites of the SATPS and a radio for coupling the received signals to the rover unit. The present invention automatically determines the best source of position data. The best source of position data is then used to calculate the position of the rover unit.

Abstract: A method and apparatus are provided for performing remote control and viewing with a total station. The total station is operated remotely from a remote control and viewing unit (RCVU) by a single user. The total station has a measurement unit, a video camera aligned with the measurement unit for acquiring real-time images of a target, and a transceiver for transmitting video images to the RCVU and for receiving control data from the RCVU. The RCVU includes a transceiver for transmitting the control data to the total station and for receiving the video images from the total station. The RCVU also includes a display device for displaying real-time video images from the camera and includes controls for allowing the user to remotely align the total station with the target using the displayed video images. A fine-tuning focus control on the RCVU allows the user to remotely focus the camera.

Abstract: A method and apparatus for automatic event detection and processing is provided. A positioning system receiver includes a position measurement device and a logging device. The position measurement device is configured to receive and process signals from a positioning system. The logging device is coupled to the position measurement device for recording data received from the position measurement device. The logging device records the data at a current logging rate. The positioning system receiver detects an event via an external sensor or with reference to satellite data, for example. In response to the event, the logging device automatically modifies data logging processing such as the current logging rate. Additionally, to allow a post processing system to go backwards in time relative to the event, the current logging rate may be increased for a predetermined amount of time preceding the occurrence of the event.

Abstract: A centimeter level survey system includes reference base station and rover GPS units connected by a radio data link. Each includes recorders for the storage of raw measurement information including range, phase, cycle counts and time information. The rover unit is typically moved to points of interest during a survey while the base remains over a fixed, and known location. Generally, the base antenna is located to optimize a clear view of the sky. The rover is subject to interruption of the radio data link from the primary reference station. During periods that the rover is initialized and in contact with the primary reference station base station over the radio data link, the rover provides real time centimeter level position solutions to a survey user, otherwise, the rover records its raw measurements in a file that begins with the last valid initialization information and that ends with any newly reestablished initialization information.