A need to calibrate indicator for high frequency direction finding systems
Jenn, David C.
Knorr, Jeffrey B.
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This thesis proposes and investigates a new approach in attacking the need to calibrate problem of the shipboard HFDF systems. It is based on measuring the system response to multiple onboard near-field sources. The test is performed along with the standard calibration, and the antenna responses to the near-field sources are stored in a reference database. Whenever a modification is made to the topside, the near-field test is repeated and the new results are compared to the near-field reference database. A significant difference may indicate a need to perform a full system calibration. The calibration procedure was simulated using the numerical electromagnetics code PATCH. Calculations show that the antenna responses are comparable when topside changes were introduced
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