1 / 27

ADWRS Radar Simulation - Application in the TPAWS Certification Tool Set

ADWRS Radar Simulation - Application in the TPAWS Certification Tool Set. Robert Neece NASA/Langley Research Center. Outline. Certification Tool Set ADWRS – Airborne Doppler Weather Radar Simulation ADWRS Application to the Certification Tool Set

keiko-macdonald
Download Presentation

ADWRS Radar Simulation - Application in the TPAWS Certification Tool Set

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. ADWRS Radar Simulation - Application in the TPAWS Certification Tool Set Robert Neece NASA/Langley Research Center

  2. Outline • Certification Tool Set • ADWRS – Airborne Doppler Weather Radar Simulation • ADWRS Application to the Certification Tool Set • Post-processing and display adaptation for the Tool Set • Summary

  3. Certification Tool Set Parameters (e.g. A/C information) Radar simulation provides I&Q Spatial atmospheric dataset Processing by detection algorithm Predicted A/C loads Calculate A/C loads truth dataset A/C loads truth set Comparison, grading, and evaluation of the detection algorithm performance

  4. ADWRS Purpose To provide a comprehensive calculation of the signal characteristics and expected outputs of an airborne, coherent, pulsed Doppler radar system.

  5. Calculates I & Q signal components from data files: Wind velocity components TKE file (if used) Radar reflectivity of moisture Discrete target file (if used) ADWRS Capabilities

  6. Simulates: Three antenna classes- (2 measured, 1 theoretical) Antenna side lobe effects Ground clutter Ground clutter filters Transmitter/Receiver phase errors Quantization errors User-selected antenna scanning strategies User-selected aircraft trajectories ADWRS Capabilities (cont)

  7. Current Signal Processing: Ground clutter filtering Automatic gain control Calculation of Doppler velocity, spectral width, shear hazard, and other radar and data set parameters of interest ADWRS Capabilities (cont)

  8. ADWRS Verification • ADWRS 3.0 was verified against clutter maps • ADWRS 4.0 was verified by comparison to atmospheric data sets • ADWRS 5.0 has been verified by comparison to 4.0 and comparison to atmospheric datasets

  9. Simulation Coordinate System Y-Axis 3D Weather Data Field Y-Vel Velocity Vector Z-Axis Up X-Axis X-Vel Aircraft @ (Xoff, Yoff, Zoff)

  10. TASS Data -- Reflectivity

  11. Plot of TASS Reflectivity vs Range ADWRS 5.0 data position: x=-6, y=23.5, z=33.8 km 30 20 10 dBZ 0 0 5 10 15 20 25 -10 -20 Range (km)

  12. Calculated ADWRS Reflectivity (dBZ) ADWRS 5.0 TASS 25m data set 191-06 Time=48min Alt=10.3km

  13. Calculated Spectral Width (m/s) ADWRS 5.0 TASS 25m data set 191-06 Time=48min Alt=10.3km

  14. Velocity Plot Produced by ADWRS 4.0 (NCAR Data Set)

  15. Velocity Plot Produced by ADWRS 5.0 (NCAR Data Set)

  16. ADWRS GUI • Allows entry of configuration parameters without risk of formatting errors. • Provides default values when no specific value is entered.

  17. ADWRS GUI Submenus

  18. Interfacing to ADWRS Weather Data X,Y, Z wind Velocities A D WRS Sub-grid TKE D I S P L A Y I & Q Signal Radar Reflectivity Doppler Velocity Spectral Width Radar Parameters Shear Hazard Config. File Aircraft Parameters Simulation Param.

  19. Role in Certification Tool Set A D WRS Radar Post- Processing & Display I & Q Signal Radar Parameters Config. File Aircraft Parameters Radar Param. Simulation Param. A/C Param. Sim. Param. X,Y, Z Wind Vel. TPAWS Weather Data Set Sub-grid TKE Radar Reflectivity Optional A/C G Forces (along a flight path)

  20. Calculate and output frame number & time in seconds Calculate and output aircraft airspeed, track angle and heading Generate a new binary I & Q output file with additional data structures to include all radar and aircraft parameters required by display program Changes to ADWRS 5.0

  21. Changes to ADWRS 5.0 MODIFIED ADWRS EXISTING ADWRS 5.0 Radar Post- Processing & Display Calculate I & Q Calculate frame number, time, & other radar parameters Create new output file I&Q AC data Calculate A/C airspeed, track angle & heading Radar data

  22. Replace input routines Current routines Read header and I&Q data in Rockwell Collins format Apply STC correction Decode ARINC-429 parameters Discard weather scans New routines Read header and I&Q data in ADWRS format Changes to Post-processing S/W

  23. Realtime or Post-processing Decode header data and scale I&Q Read ADWRS data Read recorded radar data Realtime Processing Filter interface Post-processing ADWRS Data Process Data G-Loading predictions Results

  24. Post-processing and Displays Baseline Process Compute spectra Remove A/C velocity CFAR threshold Calculate moments Calculate scale length Calculate bin-to-bin variance in velocity Calculate total variance Calculate predicted loads Displays Received power / Reflectivity Velocity Spectral Width Predicted G-load Text display of parameters e.g. time, altitude, position

  25. Real Time Displays

  26. Post-processing Displays

  27. Status and Summary • ADWRS 5.0 and realtime processing and display programs are being modified for use in the Certification Tool Set • Changes to ADWRS are nearing completion • The post-processing software will be modified to read the new ADWRS output

More Related