A system and method are provided for producing radio-frequency (RF) coverage maps for networks of ground stations. The coverage maps are produced from ground station log files that are generated for a particular network of RF radio stations, including an ARINC VHF Data Link Mode 2 (VDLM2) Network. A coverage map regarding interactive communications between aircraft and various ground stations at a particular location therefrom is generated based on actual available operating data including geographic locating of an aircraft, which may be according to Global Positioning Satellite (GPS) system data or other aircraft geolocating data, and Received Signal Strength Indication (RSSI) measurements for the data exchange with the aircraft. Collected and/or recovered actual available operating data may be massaged to determine an actual coverage map, which may map the RSSI measurements to associated aircraft geographic locations to provide indications of relative signal strengths at various points around the particular location.

The disclosure provides a computer-implemented system for establishing a wireless mesh network resistant to degradation induced by deliberate jamming or other electromagnetic interference emanating from point sources within an operating area. The computer-implemented system provides WMN AP locations that minimize disruptions to client coverage caused by jammers, subject to constraints on network service. The computer-implemented system considers jammers placed by an intelligent adversary and identifies the AP locations λ through quantification of an objective function of the general form Z(λ,χ)=Z.sub.coverage(λ,χ)−w Z.sub.flow(λ,χ), where Z.sub.coverage(λ,χ) reflects resulting coverage shortfall, Z.sub.flow(λ,χ) reflects traffic flow within the WMN, and w is a scalar reflecting the relative weight of the two terms. The final set of AP locations λ identifies the locations of APs to create a WMN that is the most robust to the worst possible jamming attack. Such an attack could represent the actions of a rational human opponent, or the worst-case positioning of unintentional interference sources such as civilian radios, other RF devices, or high-voltage electrical devices.

The disclosure provides a computer-implemented system for establishing a wireless mesh network resistant to degradation induced by deliberate jamming or other electromagnetic interference emanating from point sources within an operating area. The computer-implemented system provides WMN AP locations that minimize disruptions to client coverage caused by jammers, subject to constraints on network service. The computer-implemented system considers jammers placed by an intelligent adversary and identifies the AP locations λ through quantification of an objective function of the general form Z(λ,χ)=Z.sub.coverage(λ,χ)−w Z.sub.flow(λ,χ), where Z.sub.coverage(λ,χ) reflects resulting coverage shortfall, Z.sub.flow(λ,χ) reflects traffic flow within the WMN, and w is a scalar reflecting the relative weight of the two terms. The final set of AP locations λ identifies the locations of APs to create a WMN that is the most robust to the worst possible jamming attack. Such an attack could represent the actions of a rational human opponent, or the worst-case positioning of unintentional interference sources such as civilian radios, other RF devices, or high-voltage electrical devices.

An aspect of the present disclosure relates to an autonomous moving machine which may maintain the self-location with high reliability. Operations of the moving machine include acquiring sensor information about the self-location, estimating the self-location based on the sensor information, calculating the reliability of the estimated self-location, recording the reliability in association with the estimated self-location. When the reliability satisfies a given condition, the operations include moving the moving machine to a position at which the reliability is high, based on the reliability.

Systems, methods, and apparatus for automatic signal detection in a radio-frequency (RF) environment are disclosed. At least one node device is in a fixed nodal network. The at least one node device is operable to measure and learn the RF environment in a predetermined period based on statistical learning techniques, thereby creating learning data. The at least one node device is operable to create a spectrum map based on the learning data. The at least one node device is operable to calculate a power distribution by frequency of the RF environment in real time or near real time, including a first derivative and a second derivative of fast Fourier transform (FFT) data of the RF environment. The at least one node device is operable to identify at least one signal based on the first derivative and the second derivative of FFT data.

A recursive algorithm may be applied to group cells in a service network into a small number of clusters. For each of the clusters, different regression algorithms may be evaluated, and a regression algorithm generating a smallest error is selected. A total error for the clusters may be identified based on the errors from the selected regression algorithms and from degrees of separation associated with the cluster. If the total error is greater than a threshold value, the cells may be grouped into a larger number of clusters and the new clusters may be re-evaluated. A key performance indicator (KPI) may be estimated for a cell based on a regression algorithm selected for the cluster associated with the cell. A resources may be allocated to the cell based on the KPI value.

The invention relates to method for configuring a first wireless network that includes at least one access point. In order to optimize the configuration of the first wireless network, the method comprises a step of configuring at least one parameter of the at least one access point of the first wireless network on the basis of at least a portion of the linking balance of a second wireless network including at least two nodes, the nodes being positioned in a predetermined physical space.

A wireless communication quality visualizing device includes a display data generating unit which generates display data for displaying the communication quality from data on the communication quality collected by the multiple measurement devices in accordance with a measurement condition which can specify information for measuring the communication quality, a position determining unit which determines whether or not the measurement device has moved and for estimating a position of the measurement device after the movement, and a condition setting unit which changes the measurement condition when the position determining-unit determines that the measurement device has moved.

A wireless communication quality visualizing device includes a display data generating unit which generates display data for displaying the communication quality from data on the communication quality collected by the multiple measurement devices in accordance with a measurement condition which can specify information for measuring the communication quality, a position determining unit which determines whether or not the measurement device has moved and for estimating a position of the measurement device after the movement, and a condition setting unit which changes the measurement condition when the position determining-unit determines that the measurement device has moved.

The present invention relates to a TDMA access method and device based on multiple access points. According to the problems that the existing method cannot simultaneously satisfy the demands of timeliness and reliability in actual industrial application and has low resource utilization rate, the present invention takes full consideration of the transmission characteristics and industrial automation application characteristics of wireless networks, and provides a TDMA access method and device based on multiple access points. The main ideas of the method in the present invention are: the multi-access point redundant communication manner is adopted to improve system reliability, beacon frames of multiple access points are utilized to perform time synchronization so as to improve synchronization precision, confirmation messages are fed back with regard to reliable access points to reduce the number of retransmissions, and a modularized multi-access point device design method is adopted to lower the difficulties of device maintenance and management.