The FAR codes
The FAR code models in the time and frequency domains, the far fields resulting from electromagnetic fields generated in complex near field environments. There are three versions of the code, a stand-alone version and two post-processor versions (time histories and frequency patterns) which model the far fields of the outputs from finite difference time domain codes. This report covers the formula development, code construction, code validation, and error sources of the code. The errors which may be mitigated, but not eliminated, are the grid sampling error, the magnetic field adjustment error, and the discrete Fourier transform (DFT) errors. Only the last error occurs with the stand-alone version. The grid sampling error is inversely proportional to the number of sampling points per square wavelength and is mitigated by using a finer mesh. The magnetic field adjustment error is mitigated by using a two point spatial averaging and a three point time interpolation. The DFT errors are aliasing, leakage, and picket-fence errors. They are mitigated by using a transit pulse with reduced high frequency content and using a zero packing technique in the DFT routine. 19 refs., 293 figs., 44 tabs.
- Research Organization:
- Lawrence Livermore National Lab., CA (USA)
- Sponsoring Organization:
- DOE/DP
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 6734412
- Report Number(s):
- UCRL-ID-104183; ON: DE90014729
- Country of Publication:
- United States
- Language:
- English
Similar Records
A transient near to far field transformation method and verification benchmarking procedure
Related Subjects
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
99 GENERAL AND MISCELLANEOUS
990200 -- Mathematics & Computers
COMPUTER CALCULATIONS
COMPUTER CODES
DATA
DATA COMPILATION
DIFFERENTIAL EQUATIONS
ELECTROMAGNETIC FIELDS
EQUATIONS
ERRORS
F CODES
FINITE DIFFERENCE METHOD
FREQUENCY DEPENDENCE
INFORMATION
ITERATIVE METHODS
MAXWELL EQUATIONS
NUMERICAL SOLUTION
PARTIAL DIFFERENTIAL EQUATIONS