Method for Vibration Detection During Near-Field Antenna Testing

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CRANE-83283
Traditionally, antenna performance measurement was conducted by placing the antenna at a remote location and measuring the amplitude response characteristics as a function of orientation of the antenna throughout its operational range. This technique suffers from significant practical limitations such as susceptibility to the effects of weather, ground reflections, and increasing real estate costs. Relative vibration between an antenna under near-field testing and the near-field probe can cause errors.

Naval Surface Warfare Center, Crane Division (NSWC Crane), has developed and patented a method of detecting relative vibrations between Antenna Under Test (AUT) and a probe during near-field testing. This technology revolutionizes the data collection process during a near-field test. In contrast to the standard process of collecting data only at a series of discrete points, data is sampled regularly as the probe moves with a constant velocity across its data plane/measurement field or virtual surface. This method provides the means to measure and compensate for any data inaccuracies/errors created by relative vibrations, requiring no additional hardware other than that normally utilized in conducting a near-field test.

Advantages:
-Reduces measurement error
-Increases accuracy
-Eliminates a source of test error and increases confidence that an accurate test has been conducted.

Potential Applications:
-Spacecraft
-Aircraft
-Ship
-Ground vehicle
Dec 27, 2001
Utility Patent
United States
6,570,539
May 27, 2003
Purdue Office of Technology Commercialization
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West Lafayette, IN 47906

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