Shipboard HF electromagnetic field measurements for EMC

The distribution of shipboard HF electromagnetic field radiated from HF transmitter was needed for electromagnetic compatibility (EMC) and radiation hazard (RADHAZ) purposes. The electric and magnetic field were measured on the ship deck. Due to complex electromagnetic environment and measurement conditions, thorough pre-measurement analysis and planning was done. The fields on the deck were estimated analytically and calculated numerically. This analysis cleared the potential problems and enabled the right choice of measuring instruments. The fields were measured using narrowband equipment: loop and rod antenna connected to the test receiver. The measurement results were found to be similar to the values predicted by pre-measurement analysis.