WRC 2027 Agenda Item Details

Agenda Item: Agenda Item 1.8
Resolution(s): Resolution 663 (Rev. WRC-23)
Description of work:

This agenda item is to consider possible additional allocations to the radiolocation service (RLS) on a primary basis in the frequency range 231-275 GHz and possible new identifications for the radiolocation service applications in frequency bands in the frequency range 275 - 700 GHz for millimetric and sub-millimetric wave imaging systems.

The ITU-R is invited to study:

  1. technical and operational characteristics including protection criteria for receive-only and active millimetric and sub-millimetric wave RLS
  2. studies on globally harmonized spectrum for RLS
  3. sharing and compatibility studies (in-band and adjacent) for RLS and other services in the frequency range 231.5 - 275 GHz while ensuring protection for the current use and further development of the incumbent services allocated to this frequency range
  4. sharing and compatibility studies (in-band and adjacent band) for RLS applications with EESS(passive), space research service (passive) and RAS applications in the frequency range 275-700 GHz while maintaining protection for the passive service applications identified in No. 5.565
  5. sharing and compatibility studies (in-band and adjacent bands) for RLS applications with fixed service and land mobile service applications in the frequency range 275 - 450 GHz as identified in No. 5.564A

WRC-27 is invited to consider the results of the above studies and take necessary actions, as appropriate.


The RLS applications for these bands include ranging, imaging (including material analysis and localization) and there are two main configurations:

  1. active (radars) which may require bandwidths up to 30 GHz to achieve range resolutions in the order of 0.5cm
  2. receive-only use, which will detect extremely weak power that is naturally radiated and require a wider frequency bandwidth than active systems to collect enough power for detection

These frequency ranges, well above 100 GHz, are still under-utilised but offer potential for future services. Note the difficulty of protecting of not just the current use but also services that could operate in the future within unknown characteristics!

Lead Working Party(s): WP 5B
Involved Working Parties: WP 3J, WP 3K, WP 3M, WP 4A, WP 4C, WP 5A, WP 5C, WP 7C, WP 7D
How Visualyse products can help:

Visualyse Professional can the applications covered by this agenda item including RLS, EESS(passive), space research, radioastronomy, fixed and mobile applications. We can also model services in adjacent bands and both co-frequency and non-co-frequency interference paths. Visualyse Professional includes the line-by-line integration method in the propagation model in Recommendation ITU-R P.676 that can be used up to 1,000 GHz.

How Transfinite consultants can help:

We can undertake studies including analysis of sharing between RLS (active or receive-only) systems and the other services that could be co-frequency or in adjacent frequency bands and identify suitable system characteristics and sharing criteria, and provide contributions and representation at ITU-R Working Parties. Using our in house Visualyse Professional we can quickly model a very wide range of systems, services and scenarios.

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