Content. VOR Weather radar Surveillance radar WERAN. EMC Problem and Background. Numerical Simulations in WERAN. Summary

Transkript

1 WERAN Improved Simulation Techniques to Analyse to the Interaction Between a Windmill Power Plant and RADAR Systems T. Schrader, J. Bredemeyer, C. Stupperich, H. Garbe Content EMC Problem and Background VOR Weather radar Surveillance radar Numerical Simulations in WERAN Summary page 2

2 EMC Problem and Background View southwards from Langeoog island (Northern Sea) Area subject to survey within 15km (10 km) radius around nav aid or radar per ICAO EUR DOC 015 page 3 Project Partners of WERAN Non funded Partners: Deutsche Flugsicherung Deutscher Wetterdienst FKZ: A D page 4

3 Doppler VOR (D VOR) groundstation w/ DME source: Wikipedia page 5 Observation: Noise of Bearing Error Conventional Flight inspection: Two subsequent observations Line 2 shows improvements (antenna repair, cut oftrees) What influence caused by additional WT or Repowering? page 6

4 ICAO Defines Signal in Space but flight inspection only reveals what the receiver does out of it page 7 Content EMC Problem and Background VOR Weather radar Surveillance radar Numerical Simulations in WERAN Summary page 8

5 Scientific Approach Distinguish the parts of the Communication channel Non linear part (Radar signal processing) linear part (channel, wave propagation) page 9 Project Setup WERAN Design of 3D Antennas for all frequencies of systems under investigation Development of bandpass signal measuring units Installing and implementing all equipment on the UAV Development of precision localisation, used for positioning in free space EMC system testing for high field strength levels Calibration traceable to the SI, determining total measurement uncertainty (MU) Validation measurement on Open Area Test Site Hardware Site analysis of Surveillance Radar systems Measurements on site for all systemsapplying UAV Flight inspection measurement at all systems where useful Correlation of field strengths w/ key parameters like P d etc. Measurements Numerical simulations of szenarios w/ increasing complexity (Benchmark catalog) Validation by measurement of Benchmark catalog (incl. total MU) Round robin testing (assessors) w/ regard to benchmark catalog Simulations page 10

6 Content EMC Problem and Background VOR Weather radar Surveillance radar Numerical Simulations in WERAN Summary page 11 Model for System Simulation LO MHz Simulation Disturbance LO2 Tx30 30 Hz Tx khz kswitch kanttxam RTx kanttxfm kchannel kantrx RF DMod kdmod1 BB kbpam BP 30 Hz BP DMod BP 9.96 khz 30 Hz kbpfm1 kdmod2 kbpfm2 AM Discr FM TP deltaphi Obtain the measurement equation, variation of all parameters with Monte Carlo method Provides the variance of the measurand deltaphi (=bearing) page 12

7 Numerical Simulation of Surface Currents and EMF Caused by a Wind Turbine Source: LUH page 13 Numerical Simulation of a DVOR Source: LUH page 14

8 Simulation of Field Strength Values above Ground Model Source: LUH Position L1 bis L12 Source of EMF: DVOR Digital Terrain Data Base (DTED) page 15 Digital Terrain Model (DTED) Source: LUH as volume as surface page 16

9 Comparison of Measurement and Simulation MEAS: Measurements (Helicopter: FCS, PTB) NFS: DVOR in free space NPP: Ground as plane PEC NTP: Ground as superposition of 1km² PEC Patches with structured surface NRPP: as NPP, with reflection coefficent NRTP: as NTP, with reflection coefficient Quelle: LUH page 17 Content EMC Problem and Background VOR Weather radar Surveillance radar Numerical Simulations in WERAN Summary page 18

10 Summary Investigation of interaction between WT und terrestrial nav. / radar Distinguish the parts of the communication channel: linear and non linear Realistic numerical simulation of the linear part of the RF channel Next Steps: Validation of numerical results by field measurements Operator decides about tolerable change of key value such as P d or bearing error Start measurements on DVOR/VOR during fall 2015, then continue with Radar page 19 Thank you! page 20