SIGNAL DEMODULATION SYSTEM

PROBLEM TO BE SOLVED: To obtain a signal demodulation system which extracts and synthesizes the radio waves of an object, received at positions different from each other and then recorded and accumulated, reliably from within the accumulated records, and the demodulates after enhancing the reception...

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1. Verfasser: WATANABE NOBU
Format: Patent
Sprache:eng ; jpn
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Zusammenfassung:PROBLEM TO BE SOLVED: To obtain a signal demodulation system which extracts and synthesizes the radio waves of an object, received at positions different from each other and then recorded and accumulated, reliably from within the accumulated records, and the demodulates after enhancing the reception quality.SOLUTION: Azimuth data acquired simultaneously with signal data by a plurality of reception systems respectively are extracted and combined roughly, and then intersections calculated in respective combinations are evaluated based on the accuracy included in each azimuth data, thus reliably specifying the positional information of a source of object radio waves. When specifying the positional information, a plurality of reception systems, which became the provision sources of the azimuth data, are specified simultaneously, and the signal data acquired by these plurality of specified reception systems is selected, and synthesized in the subsequent stage. Furthermore, SN ratio of the signal data of the selected reception system is measured, and only the signal data having a predetermined sufficient SN ratio becomes the object of synthesis.SELECTED DRAWING: Figure 1 【課題】 互いに異なる位置で受信され記録・蓄積された対象の電波を、その蓄積された記録の中から確実に抽出して合成し、その受信品質を向上させた上で復調を行う信号復調システムを得る。【解決手段】 複数の受信システムのそれぞれで信号データと同時に取得した方位データを抽出して総当たり的に組合せ、それぞれの組合せで算出された交点を、さらに方位データに含まれる確度に基づき評価して、対象の電波の発信源の位置情報を確実に特定する。同時に、この位置情報を特定する際に、方位データの提供元となった複数の受信システムを特定し、これら特定された複数の受信システムで取得された信号データを選択して、後段にて合成する。さらに、選択された受信システムの信号データのSN比を測定し、所定の十分なSN比を有する信号データのみを合成の対象にする。【選択図】 図1