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SDR時代のFM受信 マルチパスモニタとマルチパスフィルタ / FM broadcast re...
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Kenji Rikitake
October 05, 2019
Technology
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570
SDR時代のFM受信 マルチパスモニタとマルチパスフィルタ / FM broadcast reception with SDR - multipath monitor and multipath filter
BCLの集い「秋葉原ミーティング」2019年10月5日 発表原稿
Kenji Rikitake
October 05, 2019
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Transcript
SDR࣌ͷFMड৴ ϚϧνύεϞχλͱ ϚϧνύεϑΟϧλ Kenji Rikitake / BCL Akihabara Mee4ng 5-OCT-2019
1
Kenji Rikitake Γ͖͚ͨ ͚Μ͡ ྗ ݈࣍ 5-OCT-2019 BCL Akihabara Mee6ng
Akihabara T-Space Taito, Tokyo, Japan @jj1bdx Kenji Rikitake / BCL Akihabara Mee4ng 5-OCT-2019 2
ٕज़࢜ʢใֶ෦ʣ ྗ݈ٕ࣍ज़࢜ࣄॴ ॴ ϖύϘݚڀॴ ٬һݚڀһ BCLྺ 46 ࠷ۙSDRͷݚڀ։ൃத ͖ͤ·͞ΜͷإΛݟʹདྷ·ͨ͠ Kenji
Rikitake / BCL Akihabara Mee4ng 5-OCT-2019 3
ࠓͷ FMͷ࣭Լ͛ΔϚϧνύε ަมௐ → ϚϧνύεϞχλ దԠϑΟϧλ → ϚϧνύεϑΟϧλ Kenji Rikitake
/ BCL Akihabara Mee4ng 5-OCT-2019 4
FMͱϚϧνύε ෳܦ࿏Λ௨Δిͷׯব ׯবੑϑΣʔδϯάͰৼ෯͕มԽ ৼ෯ͷมԽଈࠁҐ૬ͷΈ Ґ૬͕ΉͱͱͯෆշͳԻ͕͢Δ Kenji Rikitake / BCL Akihabara
Mee4ng 5-OCT-2019 5
ϚϧνύεϞχλ ͳΜͱ͔Ϛϧνύεͷ߹͍ΛϞχλʔ͍ͨ͠ ײతʹଌఆͰ͖ͳ͔ͬͨ Kenji Rikitake / BCL Akihabara Mee4ng 5-OCT-2019
6
FMͷεςϨΦࠩ৴߸ ԻଳҬͷDSB 38kHzͰมௐ 19kHzͷύΠϩοτ৴߸ʹಉظ Kenji Rikitake / BCL Akihabara Mee4ng
5-OCT-2019 7
AMͷަมௐ AM2ͭͷใΛӡΔ sinͲΜͳʹ͕ΜͬͯcosʹͳΒͳ͍ cosͲΜͳʹ͕ΜͬͯsinʹͳΒͳ͍ ͳΒcosͱsinͰ2ͭใ͕ӡͦ͏ Kenji Rikitake / BCL Akihabara
Mee4ng 5-OCT-2019 8
ަมௐϚϧνύεϞχλ(QMM) Brian Beezley, K6STIʹΑΓߟҊ sinͰมௐͨ͠৴߸cosͰݕग़Ͱ͖ͳ͍ɺͣ ͔࣮͠͠ࡍʹΈ͕ൃੜͯ͠৴߸͕ग़ͯ͘Δ ͩͬͨΒͦͷΈΛcosͰݕग़ͯ͠Ϟχλͯ͠ΈΑ͏ Kenji Rikitake /
BCL Akihabara Mee4ng 5-OCT-2019 9
QMMͷར ΄ͱΜͲͷ์ૹʹద༻Մ ԻͰग़ͯ͘ΔͷͰΘ͔Γ͍͢ Իͷେ͖͞ͰϚϧνύεͷࠅ͕͞Θ͔Δ Kenji Rikitake / BCL Akihabara Mee4ng
5-OCT-2019 10
࣍ͷ FMͷϚϧνύεϑΟϧλ Kenji Rikitake / BCL Akihabara Mee4ng 5-OCT-2019 11
ϚϧνύεϑΟϧλ ϚϧνύεͰΜͩ৴߸Λݩʹ͢ Ͳ͏ͬͯ? Kenji Rikitake / BCL Akihabara Mee4ng 5-OCT-2019
12
FMͷϚϧνύεΈ FMૹ৴࣌ৼ෯Ұఆ ෳͷ࣌ؒࠩͰ౸ணͨ͠৴߸͕ׯব ϚϧνύεΈৼ෯ʹݱΕΔ Kenji Rikitake / BCL Akihabara Mee4ng
5-OCT-2019 13
͍͚ͬͯͳ͍͜ͱ ৼ෯Ұఆʹڧ੍ͯ͠Έফ͑· ͤΜ! ϦϛολແҙຯͰ͢ Kenji Rikitake / BCL Akihabara Mee4ng
5-OCT-2019 14
ݪཧʹ࣮ʹߟ͑Δ ෳͷԆ৴߸͕ׯব͍ͯ͠ΔͷͰ͋Εɺ ͦͷׯবͷٯԋࢉΛߦͬͯऔΓআ͍ͯΕ Α͍ Kenji Rikitake / BCL Akihabara Mee4ng
5-OCT-2019 15
۩ମతͳํ๏ Ԇ৴߸Λଧͪফ͢ϑΟϧλΛ࡞Γɺͦͷ ϑΟϧλͷޮ͖ํΛΈ͕ͳ͘ͳΔΑ͏ʹஞ ࣍ௐ͍ͯ͘͠ ͦΜͳ͜ͱ͕Ͱ͖Δͷ͔? Kenji Rikitake / BCL Akihabara
Mee4ng 5-OCT-2019 16
దԠϑΟϧλΛ͑Ͱ͖Δ ඪ: ৼ෯ΛҰఆʹ͢Δ ৼ෯ͷࠩΛޡࠩͱஅ͢Δ ޡࠩΛͬͯϑΟϧλΛௐ Kenji Rikitake / BCL Akihabara
Mee4ng 5-OCT-2019 17
దԠϑΟϧλͷ࣮ྫ 1980ʹจൃද 1 ྛًࢯʹΑΔFMDDC-3 ྗʹΑΔairspy-fmradion 1 ݄ ࢤ, Ӌௗ ޫढ़,
దԠσΟδλϧϑΟϧλʹΑΔFMϚϧνύεͻͣΈࣗಈআڈͷҰํࣜ, ςϨϏδϣϯֶձࢽ, 1985, 39 ר, 3 ߸, p. 228-234, ެ։ 2011/03/14, Online ISSN 1884-9652, Print ISSN 0386-6831, h>ps:/ /doi.org/ 10.3169/itej1978.39.228, h>ps:/ /www.jstage.jst.go.jp/arHcle/itej1978/39/3/39_3_228/_arHcle/-char/ja Kenji Rikitake / BCL Akihabara Mee4ng 5-OCT-2019 18
airspy-fmradion 2 Airspy HF+RTL-SDRͱMacRaspberry PiͷΈ߹ΘͤͰಈ࡞ ߴڃFMνϡʔφʹඖఢ FMԕڑड৴ʹޮՌ ઈࢍ։ൃத 2 h$ps:/
/github.com/jj1bdx/airspy-fmradion Kenji Rikitake / BCL Akihabara Mee4ng 5-OCT-2019 19
Thank you Ques%ons? Kenji Rikitake / BCL Akihabara Mee4ng 5-OCT-2019
20