1、STD-CEPT ERC REPORT 47-ENGL 1977 m 232b4L4 00L5b73 037 m ERC REPORT 47 -v European Radiocommunications Committee (ERC) within the European Conference of Postai and Telecommunications Administrations (CEFT) COMPATIBILITY STUDY BETWEEN THE FIXED SERVICE AND MOTION SENSORS AT 10.5 GHz Podebrady, May 19
2、97 Copyright 1997 the European Conference of Postai and Telecommunications Administrations (CEPT) ERC REPORT 47 Page 1 COMPATIBILITY STUDY BETWEEN THE FIXED SERVICE AND MOTION SENSORS AT 10.5 GHz 1 INTRODUCTION CEFTERC has developed Recommendation 12-05 for the frequency range 10.0-10.68 GHz on the
3、harmonisation of this band for the fixed service (PS) (including E!NG/OB). A new CEPTLERC recommendation is being developed covering, inter alia, the operation of short range devices withiin this frequency range. The existing recommendation TIR 60-01 (low power radiolocation equipment for detecting
4、movement and for alert) suggests, as a second choice band, the use of 10.5-10.6 GE with 500 mW EIRP systems. This band is only allocated in some countries for this application, sometimes with a lower EIRP. This report deals with compatibility issues between the Fixed Service and motion sensors / int
5、errogation systems in the frequency band 10.5-10.6 GHz. 2 EFFECT OF SUCH SYSTEMS ON FS RECEIVERS Consider only one low power device equipment, with an interfering power of 500 mW, at a frequency falling within a radio relay receiver bandwidth. A FS system at this frequency has the following characte
6、ristics : Modulation : CPSK Bit rate : 34 Mbit/s Maximum long term admissible interference : -108 dBm Bandwidth : 17 MHz Antenna diameter : 1.6 m Maximum antenna gain : 43 dB Antenna pattern : according to -R Rec.699-2 Interfering distances are derived according to the spherical earth diffraction mo
7、del (i“U-R Rec.526- 2). Additional obstacles and possible building attenuation are not taken into account in the calculation. The result shows that the interfering distance ranges from 6 to 43 km, depending on the angle I$ between the wanted transmitter pointing direction and the interfering equipme
8、nt pointing direction. The interfering area is around 400 km2. The interfering area also depends on the number of installed equipments which are assumed to increase significantly because of new interrogation equipments. ERC REPORT 47 Page 2 45 40 35 30 z c 25 G 2 20 15 10 5 0 u c UI .- L c .- 10 20
9、30 40 50 60 o 3 CONCLUSION Sharing between full power (500mW EZRP) motion sensordiinterrogation equipments and the fixed service or ENG/OB is not practicable. Note that CEFT/ERC Working Group Frequency Management defined the band 10-10.68 GHz as a harmonis4 frequency tuning range for ENG/OB systems. Tuning range is the frequency range within which the equipment is capable of being tuned to any one in a range of specified frequencies whilst maintaining the required technical and operational characteristics.
