Programs to compute the Circular Error Probability (CEP) of a location system with direction finding stations
Abstract
Three programs to compute circular error probabilities (CEP) for a radio direction finder location system, a general program with no propagation effects, a program for VHF propagation, and one for HF groundwave, are described. They form the tools for research into the influence of parameters such as bearing base, number and disposition of the stations, spread spectrum modulation, and bearing mistakes caused by instruments and surroundings. Supposing that the bearings are independent and normally distributed, the CEP is calculated from an ellipse drawn from crossbearing two or more stations. The CEP is computed for maximum arrangement of 10 stations and for low signal to noise ratio. Comparing the results with literature data, the programs show good agreement.
 Publication:

NASA STI/Recon Technical Report N
 Pub Date:
 March 1985
 Bibcode:
 1985STIN...8615538M
 Keywords:

 Error Analysis;
 Parameter Identification;
 Position Errors;
 Probability Theory;
 Radio Direction Finders;
 Computer Programs;
 Fortran;
 Ground Wave Propagation;
 Normal Density Functions;
 Signal To Noise Ratios;
 Spread Spectrum Transmission;
 Very High Frequencies;
 Communications and Radar