مشاهده مشخصات مقاله
Delayed LMS filters suppressing the RFI in cosmic rays radio detection
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نویسنده (ها) |
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Zbigniew Szadkowski
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Anna Szadkowska
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مربوط به کنفرانس |
سمپوزیوم بینالمللی سیستمها و فنآوریهای بیدرنگ و نهفته RTEST 2018 |
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چکیده |
The emission of radio waves from Extensive Air Showers (EAS), initiated by ultrahigh-energy cosmic rays, has been attributed to geomagnetic emission and charge excess processes. At frequencies 10-100 MHz this process leads to coherent radiation. Nowadays, the radio detection technique is used in many experiments consisting in studying EAS. One of them is the Auger Engineering Radio Array (AERA), located within the Pierre Auger Observatory. The frequency band observed by AERA radio stations is 30-80 MHz. The investigated frequency range is often very contaminated by human-made and narrowband radio frequency interferences (RFI). Suppression of these contaminations is crucial to lower the rate of spurious triggers.
An adaptive filter based on the Least Mean Squares (LMS) algorithm can be an alternative one for currently used IIR-notch non-adaptive filter. The paper presents the 32/64-stage filters based on non-canonical FIR filter implemented into cost-effective Cyclone IV and Cyclone V Altera FPGAs with a sufficient safety margin of the registered performance for the global clock above 200 MHz to obey the Nyguist requirement. |
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قیمت |
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