Steven J. Crowley, P.E.
Archive for the ‘Radar’ Category
The FCC has issued a Report and Order amending its rules to allow foreign object debris (FOD) detection radar equipment at airports. FOD covers a variety of debris that can collect on airport surfaces, possibly damaging aircraft. These systems will be permitted to operate in the 78-81 GHz band on a licensed basis. The FCC says it is considering other uses of the band in other proceedings. Mitchell Lazarus at the CommLawBlog provides a summary of this proceeding’s history and main issues.
At its February 20 meeting, the FCC will likely adopt a Notice of Proposed Rulemaking as a first step toward increasing the amount of spectrum available in the 5 GHz band for unlicensed devices. Up to 195 MHz might be made available, which is a 35% increase over the present 555 MHz. Chairman Genachowski announced this initiative at CES in January. A leading application for new spectrum would be IEEE 802.11ac, which could have four instead of the current two 160 MHz-wide channels.
This summarizes a selection from 215 applications for the Experimental Radio Service received by the FCC during October, November, and December 2011. These are related to AM broadcasting, FM broadcasting, spread spectrum on HF and VHF, unmanned aerial vehicle control, electronic warfare support, small satellites, white space technology, video production, managed access, TV interference, RFID, and radar. The descriptions are listed in order of the lowest frequency found in the application.
This summarizes a selection from 173 applications for the Experimental Radio Service received by the FCC during August and September 2011. These are related to long-range low-frequency radar, amateur radio, shortwave data, wireless microphones, single-sideband, mine detection, millimeter-wave communications, signal intelligence, automotive radar, satellite feeder links, meteor-burst communications, aircraft telemetry, white space systems, border security radar, 3G and 4G applications, RFID, wind turbine testing, unmanned aerial vehicles, spacecraft telemetry and control, aircraft passenger broadband, and autonomous aircraft landing systems. The descriptions are sorted by the lowest frequency found in the application.
This summarizes a selection of applications for the Experimental Radio Service received by the FCC during April and May 2011. These are related to TV white space, electromagnetic compatibility testing, train control, point-to-multipoint communications, satellite communications, radar, unmanned aerial vehicles, GPS, ultra-wideband, mobile satellite service, UMTS, mobile broadband picocells, wireless backhaul, and IEEE 802.11p. The descriptions are sorted by frequency.
This summarizes a selection of applications for the Experimental Radio Service received by the FCC during February 2011. These are related to cognitive radio, land mobile, TV white space, unmanned aircraft systems, satellite terminals, ultra-wideband, wildlife tracking, interference detection, and radar. The descriptions are sorted by frequency.
This summarizes a selection of applications for the Experimental Radio Service received by the FCC during December 2010. These are related to FM broadcasting, Positive Train Control, TV white space, mobile satellite terminals, GSM, UMTS, through-the-wall surveillance radar, troposcatter communications, millimeter-wave propagation, flight test telemetry, Doppler weather radar, and air-to-air military radar.
This summarizes a selection of applications for the Experimental Radio Service received by the FCC during October 2010. These are related to ultra-wideband, machine-to-machine, satellite, GSM, white space, and radar.
What do I mean by “selection?” I look at all applications for new experimental license or special temporary authority (ignoring renewals, modifications of existing licenses, and transfers of control). From those, I pick the ones I find most interesting, which is most except for the following:
- GPS repeaters, such as those put in a factory to replicate a GPS environment for testing. (Note, however, that companies regularly get tripped up by not demonstrating compliance with separate NTIA requirements.)
- Short-term authority for video program production. Someone needs a video link to cover a golf tournament or football game, perhaps by using flight-test telemetry bands (with that coordinator’s permission) for a day.
- Demonstrations for customers. Demonstrations at trade shows.
- An application very similar to one covered recently.
- Applications too vague or lacking enough detail to write much about. If applications are very lacking, FCC staff will sometimes ask for more information.
- Electromagnetic compatibility (EMC) compliance testing including RF immunity testing for compliance with European regulations.
- RF integration testing. (A radar from company A is paired with telemetry from company B and installed on a ship from company C.)
- Applications for general-purpose antenna test ranges.
- Applications for which confidentiality treatment has been sought. Companies can do this under the FCC’s rules, but I suspect it’s overdone at times. The request for confidentiality is made public, and may have some details. (A couple of times I have seen companies put what I think is the confidential information in the confidentiality request.) That, and a bit of independent research, can give me an idea what they’re up to. If I can make an educated guess, I will, saying so.
On to October’s applications:
- Zimmerman Associates filed an application (with supporting exhibits) for special temporary authority to test the capability of using a full polarimetric UWB radar system for identifying roadside bombs and improvised explosive devices (IEDs). Testing is to be on 3100-5600 MHz at Fort A.P. Hill, Virginia. The prototype equipment uses time-modulated ultra-wideband (UWB) technology developed by Time Domain Corporation. It generates a signal that is position modulated; the position of the modulated pulse varies randomly in time so as to produce a spectrum that approximates Gaussian noise.