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DTIC ADA120673: A Four-Phase Modulation System for Use with an Adap... |
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by Defense Technical Information Center |
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This report discusses the use of four-phase modulation in |
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a communication system with an adaptive array. A system |
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is described that provides protection against both |
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conventional (i.e., noise and cw) and smart (in |
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particular, repeat) jamming with rapid acquisition of the |
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signal at the receiver. This report first discusses four- |
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phase modulation techniques and how they can be used with |
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an adaptive array. Reference signal generation for the |
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LMS adaptive array is discussed for these modulation |
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techniques. A communication system is then described that |
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uses one of these modulation techniques. The four-phase |
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signal consists of two orthogonal biphase signals. One |
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signal contains a short code for rapid acquisition. The |
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other contains a long code for protection against smart |
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jammers. A several step signal acquisition technique is |
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also described for the system. The short code timing is |
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first acquired by a sliding correlation method. With the |
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short code used in reference signal generation, the long |
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code timing is rapidly acquired by the Rapid Acquisition |
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by Sequential Estimation method. The long code is then |
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used in reference signal generation. |
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Date Published: 2018-01-07 11:11:54 |
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Identifier: DTIC_ADA120673 |
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Item Size: 154956714 |
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Language: english |
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Media Type: texts |
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# Topics |
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DTIC Archive; Winters,Jack H ; OHIO S... |
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