ISO INTERNATIONAL STANDARD 19926-1 First edition 2019-02 Meteorology Weather radar - Part 1: System performance and operation Météorologie - Radars météorologiques - Partie 1: Performance et fonctionnement des systemes Reference number ISO 19926-1:2019(E) ISO @ IS0 2019 IS0 19926-1:2019(E) COPYRIGHTPROTECTEDDOCUMENT @ ISO 2019 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either IsO at the address below or Iso's member body in the country of the requester. ISO copyright office CP 401 : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +4122 749 0111 Fax: +41 22 749 09 47 Email: [email protected] Website: www.iso.org Published in Switzerland ii @ IS0 2019 - All rights reserved IS0 19926-1:2019(E) Contents Page Foreword ..V Introduction. ...vi 1 Scope 2 Normative references 3 Terms and definitions 4 Abbreviated terms .1 5 Basics. .2 5.1 Frequency bands .2 5.2 System configuration .3 5.2.1 Overview of radar system component units .3 5.2.2 Dual-polarization transmit modes 5.2.3 Description of components. 6 System performance and measurement parameters. .10 6.1 General aspects.. .10 6.2 Fundamental parameters .12 6.2.1 Sensitivity.. .12 6.2.2 Spatial resolution .16 6.2.3 Phase stability 21 6.2.4 Accuracy of dual-polarization measurement 22 6.3 Other key parameters 22 6.3.1 Sidelobe 22 6.3.2 Beam direction co-alignment. 22 6.3.3 Beam width matching. 22 6.3.4 Maximum rotation speed .23 6.3.5 Acceleration 23 6.3.6 Antenna pointing accuracy 23 6.3.7 Dynamic range. .23 6.3.8 Unwanted emissions. .24 7 Calibration, monitoring and maintenance .24 7.1 General aspects. 24 7.2 Calibration 25 7.2.1 General. .25 7.2.2 Types of calibration 25 7.2.3 Items, procedures and intervals of calibration 26 7.3 Monitoring. 26 7.3.1 General .26 7.3.2 Stability of radar system 26 7.3.3 Monitoring receiver stability and electrical pointing using the sun 27 7.4 Maintenance 28 7.4.1 General aspects. .28 7.4.2 Preventive maintenance 28 7.4.3 Corrective maintenance 28 7.4.4 Maintenance options 29 7.4.5 Maintenance items and intervals 29 7.5 Life-cycle management 30 7.5.1 Spare-parts strategy .30 7.5.2 System availability. 30 7.5.3 Life-cycle costs. .31 8 Staff, competencies and training .31 9 Siting and installation ..34 9.1 General aspects. .34 IS0 2019 - All rights reserved iii