摘要:
Techniques for removing delay fluctuations from network time synchronization so that timing packets that experience an inordinate network delay to not cause unneeded adjustments to a local clock. Time synchronization according to the present techniques includes measuring a network delay associated with a timing packet and discarding the timing packet if the network delay exceeds an adjustable threshold. The adjustable threshold enables balancing the quality of delay measurements in terms of delay fluctuation against the number of delay measurements that are sufficient to maintain time synchronization.
摘要:
Embodiments of the present invention reconstruct an underlying phenomenon without the need for predicting a functional form for that signal, by establishing an upper bound and a lower bound for the value of the phenomenon at every point within a measurement space. By acquiring a large enough number of measurements of the phenomenon, a sufficiently high probability that the value of said phenomenon lies between said upper and said lower bound at every point within said measurement space may be established.
摘要:
A probe management system is disclosed having a central location for developing experiments and measurement requests for the particular probe system. Instead of issues detailed measurement requests to each of the smart probes in the system, each smart probe determines the measurements to be taken based on the experiment and measurement request. Furthermore, prior to participating in such an experiment the smart probe determines its capabilities to participate and configures itself for such participation if the smart decides to actually participate in the experiment or measurement request.
摘要:
Information that includes both a time component and a value component is collected. The time component provides time and duration information associated with the value component. The value component includes one or more attributes, such as, for example, quantity, magnitude, and model parameters. The information is then transmitted over a connection to one or more downstream entities. The one or more downstream entities may then determine whether to use all or a portion of the collected information.
摘要:
Techniques for diffusing configuration data to distributed devices whose locations and movements vis-a-vis a measurement/control application may only be estimated statistically. Examples of distributed devices whose locations and movements may only be estimated statistically include handheld devices and devices mounted on vehicles or other moving platforms. A measurement/control system according to the present techniques includes a configuration data source that provides a set of configuration data that specifies a measurement/control function, and a set of distributed devices each having means for obtaining the configuration data from the configuration data source and means for diffusing the configuration data among the distributed devices.
摘要:
One embodiment of the present invention separates the region of measurement space into a plurality of sub-regions and calculates a confidence, for reconstruction of an underlying signal within said space, corresponding to each of the sub-regions. This embodiment can then accept measurements from mobile measuring devices within said measurement space and store those measurements if they originate from devices in sub-regions having a confidence below an acceptable value.
摘要:
Embodiments of the present invention reconstruct an underlying phenomenon without the need for predicting a functional form for that signal, by establishing an upper bound and a lower bound for the value of the phenomenon at every point within a measurement space. By acquiring a large enough number of measurements of the phenomenon, a sufficiently high probability that the value of said phenomenon lies between said upper and said lower bound at every point within said measurement space may be established.
摘要:
A signal monitor device that detects a signal propagating on a signal line and that generates a timestamp when the signal is detected. The timestamp may be used in a variety of applications including measuring the propagation delays on signal lines and determining the timing in a system.
摘要:
A method for time synchronization that avoids time synchronization inaccuracies caused by asymmetric delays internal to a device. Time synchronization according to the present teachings includes determining an asymmetry between an internal delay of an inbound timing packet in a device and an internal delay of an outbound timing packet in the device and correcting a time synchronization in response to the asymmetry.
摘要:
Techniques for providing a distributed application with mechanisms that enable communication among remote nodes without a central server or direct communication links among the remote nodes. A distributed application according to the present techniques includes a set of remote nodes that provide a collective store for a set of information pertaining to the distributed application and a set of mobile agents that carry the information among the remote nodes. The data carrier functions provided by the mobile agents help avoid the cost and expense associated with a communication infrastructure and a central server.