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Case Study: Investigation of Interference into 5 GHz Weather Radars from Unlicensed National Information Infrastructure Devices, Part III.
| 题名： | Case Study: Investigation of Interference into 5 GHz Weather Radars from Unlicensed National Information Infrastructure Devices, Part III. |
| 关键词： | license；structure；information；national；devices；invest；waveforms；case；study；dars |
| 摘要： | This report, Part III of the series, describes U-NII device emission spectra and introduces proposed changes to test waveforms used by the Federal Communications Commission (FCC) during DFS device certification testing. These waveforms more accurately represent TDWR waveforms. These new waveforms not only duplicate currently used TDWR waveform parameters but also include a random element to help protect the TDWR should the FAA change the TDWR pulse repetition intervals in the future. This report also details the measurements and analysis that determine the power levels at which TDWR receivers experience interference from U-NII emissions at an interference-to-noise (I/N) ratio of -8 dB (a point at which TDWR display performance visibly degrades with the legacy Sigmet RVP8 receiver). The maximum allowable interference power that can be coupled co-channel in TDWR receivers without exceeding the I/N level of -8 dB is shown to be -119 dBm/MHz at the antenna terminals. This equates, for example, to an interference power density of -43 dBm/MHz for mainbeam-to-mainbeam coupling between TDWRs and U-NII transmitters at a distance of 8 km, or -22 dBm/MHz for TDWR sidelobe to U-NII mainbeam coupling at a distance of 2 km. These power density thresholds are a function of separation distance between TDWR receivers and U-NII transmitters. This report analyzes the distances at which U-NII transmissions can be expected to routinely couple into TDWR receivers. U-NII devices on rooftops, towers, and other high points that are 153 m to 305 m (500 to 1000 ft) above ground level, as NTIA observed in San Juan, PR, will couple into TDWR mainbeams at distances within 25 km to 41 km (16 mi to 25 mi), respectively, of TDWR stations. |
| 报告类型： | 科技报告 |
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