Abstract:
A correction calculation method for a satellite based positioning system with a network of receiving units as reference stations comprises a partitioning of the network into groups of reference stations, calculation of group-specific correction factors, amalgamation of the group-specific correction factors and subsequently, derivation of network-specific correction parameters. In this partitioning, the reference stations are represented by nodes in a connected, edge-weighted graph, in the generation of which an edge respectively connecting two nodes is only generated if it satisfies a distance-dependent connectivity condition, whereby the distance between the nodes connected by this edge is input into the weighting function of this edge. From the graph a minimum spanning tree is derived and subsequently partitioned for establishing the groups, by eliminating the edge with the highest weight for each tree, the elimination of which leads to partial trees which in each case either satisfy a cardinality condition for the number of the nodes in the two resulting partial trees, or consist of a number of nodes greater than the cardinality condition.
Abstract:
A low-latency centralized RTK system utilizes an RTK server to perform matched updates using base station GNSS measurements from one or more base stations and GNSS measurements from one or more rovers, and the one or more rovers produce RTK solutions based on the results of the matched updates. The RTK server includes one or more processors that perform the matched updates and a transmitter that transmits at least the ambiguities to the rovers. The respective rovers, which have processing power that is sufficient to quickly calculate RTK baselines, utilize the received ambiguities, the base station GNSS measurements received from either the RTK server or the base stations, known base station positions and instantaneous GNSS measurements at the rovers to readily determine and update their RTK baselines and their precise positions.
Abstract:
A low-latency centralized RTK system utilizes an RTK server to perform matched updates using base station GNSS measurements from one or more base stations and GNSS measurements from one or more rovers, and the one or more rovers produce RTK solutions based on the results of the matched updates. The RTK server includes one or more processors that perform the matched updates and a transmitter that transmits at least the ambiguities to the rovers. The respective rovers, which have processing power that is sufficient to quickly calculate RTK baselines, utilize the received ambiguities, the base station GNSS measurements received from either the RTK server or the base stations, known base station positions and instantaneous GNSS measurements at the rovers to readily determine and update their RTK baselines and their precise positions.
Abstract:
A nimble and free moving guide and support apparatus for hand-held cutting devices. The device utilizes vertical support members to maintain contact with a work surface, while a base plate maintains contact with the material to be cut. Above said base plate is mounted a cutting device, such as a router, where the cutting members of said cutting device pass through an opening in said base plate. The nimbleness and free movement of this apparatus are provided by a movement mechanism, such as a ball bearing housed at the end of the vertical support members.
Abstract:
A nimble and free moving guide and support apparatus for hand-held cutting devices. The device utilizes vertical support members to maintain contact with a work surface, while a base plate maintains contact with the material to be cut. Above said base plate is mounted a cutting device, such as a router, where the cutting members of said cutting device pass through an opening in said base plate. The nimbleness and free movement of this apparatus are provided by a movement mechanism, such as a ball bearing housed at the end of the vertical support members.
Abstract:
A correction calculation method for a satellite based positioning system with a network of receiving units as reference stations comprises a partitioning of the network into groups of reference stations, calculation of group-specific correction factors, amalgamation of the group-specific correction factors and subsequently, derivation of network-specific correction parameters. In this partitioning, the reference stations are represented by nodes in a connected, edge-weighted graph, in the generation of which an edge respectively connecting two nodes is only generated if it satisfies a distance-dependent connectivity condition, whereby the distance between the nodes connected by this edge is input into the weighting function of this edge. From the graph a minimum spanning tree is derived and subsequently partitioned for establishing the groups.