Rafael Advanced Defense Systems. has filed a patent for a process that determines frequency allocations for efficient spectrum management and reuse in communication between multiple users of moving platforms and ground stations using directional antennas. The process involves generating a preferential ranking list and repeatedly recalculating desirable frequency allocations based on this list and user-to-user interference data. GlobalData’s report on Rafael Advanced Defense Systems gives a 360-degree view of the company including its patenting strategy. Buy the report here.
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A process for determining frequency allocations for efficient spectrum management and reuse in communication between multiple users of moving platforms and ground stations using directional antennas
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A recently filed patent (Publication Number: US20230199545A1) describes a process for determining frequency allocations for efficient spectrum management and reuse in communication between multiple users of moving platforms and ground stations using directional antennas. The process involves generating a preferential ranking list and repeatedly recalculating desirable frequency allocations based on this list and user-to-user interference data.
The user-to-user interference data is a matrix that updates in real-time, providing accurate and up-to-date information for the frequency allocation process. The input to the process includes various factors such as available spectral bandwidths, desired order of utilization of frequencies and bandwidths, platform priority ranking, geographic locations of ground stations, platform to ground-station assignments, location and velocity of moving platforms, spatial gains of directional antennas, possible bandwidth occupancies of modems used, and information regarding unused spectrum from external neighboring sources.
The output of the process includes frequency allocation for each link and bandwidth allocation for each link. This allows for efficient and optimized use of the available spectrum resources.
In terms of the communication between ground stations and platforms, there are two scenarios. In one scenario, the up-link and down-link channels share at least some of the same frequency spectra. In the other scenario, the up-link and down-link channels do not share the same frequency spectra. In the latter case, the process is carried out independently for the up-link and down-link allocations.
The frequency allocation size is selected from a group of pre-defined sizes, ensuring that no gaps are left between the members of the group after assignment or release of an allocation. This group of pre-defined sizes consists of sizes that are multiples of a base size.
The pairing of ground stations and moving platforms can be done according to predefined criteria or randomly. Additionally, the process involves generating a table of 'platform viewed angle' and 'platform viewed RSSI' (Received Signal Strength Indication) based on the locations and direction of the antenna patterns. This information is used to compute the signal-to-interference ratio between ground stations and moving platforms. The interference ratio is obtained by subtracting the Viewed RSSI of the disturber from the Viewed allocated platform RSSI. Furthermore, an interference Boolean matrix is generated, providing information on which platforms would interfere with each other if using the same frequency channel.
Overall, this patent describes a comprehensive process for determining frequency allocations for efficient spectrum management and reuse in communication between multiple users of moving platforms and ground stations. The process takes into account various factors and real-time user-to-user interference data to optimize frequency and bandwidth allocations.
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