esf workshop - active protection of passive radio services cagliari 28-30 october 2004 page 1 esf...

ESF Workshop - Active Protection of Passive Radio ServicesCagliari28-30 October 2004

ESF WORKSHOP“ACTIVE PROTECTION OF PASSIVE SERVICES”

Planned Implementation of Automotive Short-Range Radars in the Frequency Band 23.6 - 24.0 GHz

Robert Wolf

Frequency Manager

EUMETSAT


Protection of Passive Services

• ITU Radio regulations Footnote 5.340:

”All emissions are prohibited in the following bands:

…….23.6 - 24 GHz …….

This footnote was created to protect passive from active services noting the vulnerability of passive measurements


Implementation of SRR in the band 23.6 -24 GHz (2001)

• Group of car manufacturers and suppliers of parts organise themselves in SARA

• SARA plans to implement SRR´s in cars• SARA recognised the availability of an integrated circuit for

SRR operating around 24 GHz• SARA approached European Commission for licensing• ETSI developed draft standard• EC issued mandate to ECC• ECC tasked WG SE to consider the compatibility issues


Implementation of SRR in the band 23.6 -24 GHz (2001-2002)

• SE 24 tasked to study SRR compatibility with allocated services (EESS passive, RAS,FS)

• Scientific Community was informed and participated in SE24• USA issued “ FCC Report and Order” allowing SRRs around

24 GHz (February 2002)• Study on impact of SRRs to passive measurements edited by

CNES,ESA, EUMETSAT and presented to SE24• Discussions with SARA in SE24 - update of study



• SE24 concluded• SRR (assuming use of US power levels) cannot share

the band 23.6 -24 GHz without limitations– Only < 10% of cars may be equipped with SRR– implementation must be stopped before new generation

of satellites will be introduced– automatic switch off must be implemented to protect

radio astronomy stations – frequency band for final implementation must be

assigned (79 GHz was found suitable)



• Further discussions in SE24 - modifications to studies including scattering models and new antenna parameter

• SE24 forwards sharing report to SE (approved May 2003)• On this basis ECC tasked WG FM to develop ECC draft decision• FM mandates Short Range Maintenance Group to draft decision

for SRRs and agrees on– permanent band for SRRs around 79 GHz– interim implementation of SRRs in band 23.6 - 24 GHz– maximum of 7 % of cars with SRR– end date 2013 -automatic switch off facilities mandatory


Interaction between ECC and EC(2004)

• ECC agreed FM inputs and introduced small modifications• ECC forwarded draft decision to EC• RSCom in EC is responsible for further actions• RSCom decisions still outstanding• Efforts in RSCom meeting to change ECC recommendations

(higher penetration rate, longer duration, switch off facility only after 2 years)

• Protests from ECC administrations present at RSCom meeting


Problems

• Science Community has no influence in RSCom and further EC processes

• Observers need to be invited by EC• Science community comes very late into process• For the first time there will be an active use in a band

protected by FN 5.340• This could become a model for future applications


Outlook

• Exchange of information between the various groups in the Scientific Community appears very good

• Scientific Community is closely involved in ECC work by observer status

but

• How can the Science Community improve their status in EC bodies and influence decisions?

esf workshop - active protection of passive radio services cagliari 28-30 october 2004 page 1 esf...

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