A Calibration Procedure for an HFSWR Receive Array
This report contains a description and performance evaluation of the matrix calibration method developed by the author in 1995 for the receive antenna array in the high frequency surface wave radar (HFSWR) at Cape Race, Newfoundland. The evaluation compares this method with two other methods: (a) th...
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| Format: | Text |
| Language: | English |
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2001
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| Online Access: | http://www.dtic.mil/docs/citations/ADA398967 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA398967 |
| Summary: | This report contains a description and performance evaluation of the matrix calibration method developed by the author in 1995 for the receive antenna array in the high frequency surface wave radar (HFSWR) at Cape Race, Newfoundland. The evaluation compares this method with two other methods: (a) the phase-only calibration method being used, and (b) an assumed gain-and-phase method that equalizes the complex element output amplitudes of signals in the boresight direction. The results showed that the matrix calibration method had the most accurate direction estimates, the narrowest spectral peaks, the best resolution of closely space targets, and the lowest signal-to-interference-plus-noise ratio (SINR) threshold for target detection. The phase-only and gain-and-phase methods had false target tracks and direction-dependent biases in direction estimates. The phase-only method also had a line splitting problem. Based on the difference in SINR thresholds for target detection, the matrix calibration method could increase the present maximum nighttime target detection range of the HFSWR by more than 50% in situations where the interference is highly directional and extremely strong. --Original contains color plates: All DTIC reproductions will be in black and white. Abstract and Summary in English and French. |
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