電子航法研究所研究発表会（第16回平成28年６月） 㸯㸰㸬*36/ ಙྕࡢ᪂⯟ἲ࣓ࢵࢭ࣮ࢪࡢ⏝ྍ⬟ᛶ ⯟ἲࢩࢫࢸ࣒㡿ᇦ ͤᮧගᩍ㸪㯞⏕㈗ᗈ㸪ᆏὈ 1 ⫼ᬒ 1.1 GNSS ࡢ㏆௦ ㏆ᖺ㸪ேᕤ⾨ᫍࢆ⏝ࡋ࡚⨨ᶆᐃࡍࡿᆅ ⌫⯟ἲ⾨ᫍࢩࢫࢸ࣒㸦GNSS: Global Navigation Satellite Systems㸧ࡢ㏆௦ࡀ㐍ࡵࡽࢀ࡚࠸ࡿࠋ ලయⓗࡣ㸪⡿ᅜ GPS ࡢ➨ 3 Ẹ㛫⏝ ಙྕ 㸦L5㸧ࡢᨺ㏦ࡸ㸪㟢ᅜ GLONASS ࡀᨺ㏦ࡍࡿ ᚑ᮶ࡢ FDMA ᪉ᘧಙྕᑐࡋ࡚᪂ࡋ࠸ CDMA ᪉ᘧಙྕࡢ㏣ຍ㸪ࡲࡓḢᕞࡢ Galileo ࡸ୰ᅜࡢ BeiDou ࠸ࡗࡓ᪂ࡋ࠸ GNSS ࡢᒎ㛤➼࡛࠶ࡿࠋ 1.2 SBAS ࡢḟୡ௦ GNSS ࡢ㏆௦ࡀ㐍ࡴ୰㸪㟼Ṇ⾨ᫍᆺ⾨ᫍ⯟ ἲ ⿵ ᙉ ࢩ ࢫ ࢸ ࣒ 㸦 SBAS: Satellite Based Augmentation System㸧ࡢḟୡ௦つ᱁ࡢ᳨ウࡀ⾜ ࢃࢀ࡚࠸ࡿࠋ ⾨ᫍ⯟ἲ⿵ᙉࢩࢫࢸ࣒ࡣ㸪GNSS ࡢ␗ᖖ≧ ែࢆ┘どࡍࡿࡇ࡛ GNSS ࢆ⿵ᙉࡋ㸪ࡑ ࡢᏳᛶಙ㢗ᛶࢆᢸಖࡍࡿࢩࢫࢸ࣒࡛࠶ࡿࠋ ⯟✵ᶵࡀ⯟ἲ࠾࠸࡚ GNSS ࢆ⏝ࡍࡿ 㝿ࡣ㸪⾨ᫍ⯟ἲ⿵ᙉࢩࢫࢸ࣒ࡼࡿ ࡢ⿵ ᙉࡀᚲ㡲࡛࠶ࡿࠋSBAS ࡣ㸪⾨ᫍ⯟ἲ⿵ᙉࢩ ࢫࢸ࣒ࡢ୍✀࡛࠶ࡾ㸪GNSS ಙྕࡢㄗᕪࡸ ␗ᖖ≧ែࢆᆅୖタ⨨ࡋࡓཷಙᶵࢿࢵࢺ࣮࣡ࢡ ࢆ⏝࠸࡚┘どࡋ㸪ࡑࡢሗࢆ㟼Ṇ㌶㐨ୖࡢ⾨ᫍ ࢆࡋ࡚⯟✵ᶵ㸦࣮ࣘࢨ㸧㏻▱ࡍࡿࡇ࡛ GNSS ࢆ⿵ᙉࡍࡿࢩࢫࢸ࣒࡛࠶ࡿࠋ ⌧⾜ࡢ SBAS ࡛ࡣ㸪GPS ࡢ L1 ᖏ ಙྕࢆ ┘どࡍࡿࡇ࡛⿵ᙉሗࢆసᡂࡋ㸪࣮ࣘࢨఏ ㏦ࡋ࡚࠸ࡿࠋࡑࢀᑐࡋ࡚ḟୡ௦ SBAS ࡣ㸪⿵ ᙉ ࡍ ࡿ GNSS ࢆ ቑ ࡸ ࡍ ࣐ ࣝ ࢳ ࢥ ࣥ ࢫ ࢸ ࣞ ࣮ ࢩࣙࣥࡍࡿࡇ࡛⾨ᫍᩘࡢቑຍࡼࡿ ⋡ ࡢྥୖࢆᅗࡾ㸪ࡲࡓ㸪 ಙྕ᪂ࡋࡃ L5 ᖏ ࢆ⏝ࡍࡿ 2 ࿘Ἴࡍࡿࡇ࡛㸪㟁㞳ᅪᨐ ➼ࡢ ⢭ᗘࡢྥୖࢆᅗࡿࠋࡇࡢࡼ࠺࡞ḟୡ௦ ࡼࡗ࡚㸪SBAS ࡼࡿ⿵ᙉ ࡢ⏝ྍ⬟ ᛶࡢྥୖࡀᮇᚅࡉࢀ࡚࠸ࡿࠋ 1.3 ḟୡ௦ SBAS ࡢ᳨ウㄢ㢟 ḟୡ௦ SBAS ࡣ㸪ࡑࡢつ᱁ྥࡅࡓከࡃࡢ ㄢ㢟ࡢ᳨ウࡀḢ⡿ㅖᅜᑟࡢࡶ┠ୗ㐍ࡵࡽࢀ ࡚࠸ࡿࠋᮏሗ࡛ࡣ㸪ࡑࢀࡽ᳨ウㄢ㢟ࡢ 1 ࡘࡋ ࡚㸪GPS ࡢ L5 ᖏ ಙྕ㔜␚ࡉࢀ࡚ᨺ㏦ࡉ ࢀ࡚࠸ࡿ᪂ࡋ࠸⯟ἲ࣓ࢵࢭ࣮ࢪ㸦CNAV: Civil Navigation Message㸧ࡢḟୡ௦ SBAS ࠾ࡅࡿ ⏝ྍ⬟ᛶࡘ࠸࡚㆟ㄽࡍࡿࠋࡑࡋ࡚㸪⌧⾜ SBAS ࡛ࡶ⏝ࡋ࡚࠸ࡿᚑ᮶ࡢ⯟ἲ࣓ࢵࢭ࣮ࢪ 㸦LNAV: Legacy Navigation Message㸧 CNAV ࡢࡕࡽࡀḟୡ௦ SBAS ࡢ⿵ᙉ㐺ࡍࡿ⯟ἲ ࣓ࢵࢭ࣮ࢪ࡛࠶ࡿࡢࢆ᫂ࡽࡍࡿࠋ ホ౯ࡢ᪉㔪ࡋ࡚㸪CNAV ࡢ⾨ᫍ㌶㐨࣭ィ ⢭ᗘࢆホ౯ࡍࡿࡇ࡛㸪LNAV ᑐࡍࡿ CNAV ࡢඃᛶࢆホ౯ࡍࡿࠋࡇࡇ࡛㸪CNAV ࡢ⾨ᫍ㌶ 㐨࣭ィ⢭ᗘ㛵ࡍࡿホ౯ࡣ᪤ᐇࡉࢀ࡚࠾ ࡾ㸪LNAV ᑐࡍࡿඃᛶࡣ᫂ࡽࡉࢀ࡚࠸ ࡿ [1][2] ࠋ ࡋ ࡋ ࡞ ࡀ ࡽ ࡑ ࢀ ࡽ ࡢ ከ ࡃ ࡣ 㸪 CNAV ࢆ GPS ࡢ༢⊂ ࡛⏝ࡍࡿ࠸࠺ほ Ⅼࡽホ౯ࡀ⾜ࢃࢀ࡚࠸ࡿࠋᮏሗ࡛ࡣ㸪ḟୡ௦ SBAS ࠾ࡅࡿ⿵ᙉ࡛⏝ࡍࡿ࠸࠺ほⅬࡽ CNAV ࡢ⾨ᫍ㌶㐨࣭ィ⢭ᗘࡢホ౯ࢆᐇࡍࡿࠋ ࡲࡓ㸪CNAV ࢆḟୡ௦ SBAS ࡛⏝ࡍࡿࡇ࡛㸪 ⾨ᫍ㌶㐨࣭ィ⢭ᗘ௨እ࡛⏕ࡌࡿᙳ㡪ࡋ࡚㸪 L5 ᖏ I-Q ┦ಙྕࡢ㑅ᢥ㛵ࡍࡿၥ㢟ࡘ࠸࡚ ࡶゝཬࡍࡿࠋ 2 SBAS ࡣ 2.1 ⌧⾜ SBAS ⌧ ⾜ ࡢ SBAS つ ᱁ ࡣ 㸪 ᅜ 㝿 Ẹ 㛫 ⯟ ✵ ᶵ 㛵 㸦ICAO㸧ࡀ⾨ᫍ⯟ἲ⿵ᙉࢩࢫࢸ࣒つ᱁ࡢ୍✀ [3]ࡋ࡚ᐃࡵ࡚࠾ࡾ㸪⯟✵⯟ἲ࠾࠸࡚ GPS ࢆ⏝ࡍࡿ㝿ࡣ㸪⾨ᫍ⯟ἲ⿵ᙉࢩࢫࢸ࣒ࡼ ࡾ㐺ษ࡞⿵ᙉࢆࡋ࡚ ࡢᏳᛶಙ㢗ᛶࢆ ☜ಖࡍࡿࡇࡋ࡚࠸ࡿࠋ ⌧⾜ SBAS ࡣ GPS ࡢ L1 ᖏಙྕ㸦L1-C/A㸧 ࢆ⏝ࡋࡓ 1 ࿘Ἴ ࢆ⿵ᙉࡍࡿࡓࡵ㸪ᆅୖ タ⨨ࡉࢀࡓཷಙᶵࢿࢵࢺ࣮࣡ࢡࡼࡗ࡚ GPS ࡢ ಙྕࢆ┘どࡋ㸪GPS ⾨ᫍࡢ␗ᖖ≧ ែࡸ ࡢㄗᕪሗࢆ㸪⿵ᙉሗࡋ࡚㟼Ṇ⾨ ᫍࢆ⤒⏤ࡋ࡚࣮ࣘࢨᨺ㏦ࡋ࡚࠸ࡿ㸦ᅗ 2.1㸧ࠋ ࡇࡇ࡛ㄗᕪሗࡣ㸪⯟ἲ࣓ࢵࢭ࣮ࢪࡽィ⟬ ─ 72 ─ 電子航法研究所研究発表会（第16回平成28年６月） ࡍࡿࡇࡀ࡛ࡁࡿ⾨ᫍࡢ⨨ࡸ㸪ᦚ㍕ࡋ࡚࠸ࡿ ཎᏊィ GPS ࡀᇶ‽ࡍࡿ้⣔㸦GPST㸧 ࡢᕪ㛵ࡍࡿㄗᕪሗ࡛࠶ࡿࠋࡲࡓ㸪1 ࿘Ἴ ࡛ၥ㢟࡞ࡿ㟁㞳ᅪఏᦙ㐜ᘏᑐࡋ࡚㸪ఏ ᦙ㐜ᘏ㔞࣐ࢵࣉࡶ⿵ᙉሗࡋ࡚ᨺ㏦ࡋ࡚࠸ࡿࠋ ࣮ࣘࢨࡣࡇࢀࡽࡢ⿵ᙉሗࢆ GPS 㐺⏝ ࡍࡿࡇ࡛ ⢭ᗘࡢྥୖࢆᅗࡿࠋ 2.2 ḟୡ௦ SBAS ḟୡ௦ࡢ SBAS つ᱁ࡣ㸪㏆௦ࡀ㐍ࡴ GNSS ࢆ⏝ࡋࡓ᪂ࡋ࠸⾨ᫍ⯟ἲ⿵ᙉࢩࢫࢸ࣒࡛࠶ࡾ㸪 ICAO ࡸḢ⡿ㅖᅜᑟࡼࡿ SBAS ┦㐠⏝ᛶ ㆟㸦IWG: Interoperability Working Group 㸧 ࠾࠸࡚㸪つ᱁ࡢࡓࡵࡢ᳨ウࡀ㐍ࡵࡽࢀ࡚࠸ࡿࠋ ᮏሗ࠾ ࡅ ࡿḟୡ௦ SBAS ࡢ ᵝࡣ㸪 SBAS IWG ࡛ᥦฟࡉࢀࡓḟୡ௦ SBAS 㛵ࡍࡿࣥ ࢱ࣮ࣇ࢙ࢫ⟶⌮ᩥ᭩㸦ICD: Interface Control Document㸧ࡢࢻࣛࣇࢺ∧[4]ࢆඖ㆟ㄽࡍࡿࠋ ⌧⾜ SBAS ࡽࡢ࡞ኚ᭦Ⅼࡣ㸪⿵ᙉᑐ㇟ࡢ GNSS ࡋ ࡚ 㸪 ⌧ ⾜ ࡢ GPS GLONASS 㸪 Galileo㸪BeiDou ࠸࠺᪂ࡋ࠸ GNSS ࢆ㏣ຍࡍ ࡿ ࣐ ࣝ ࢳ ࢥ ࣥ ࢫ ࢸ ࣞ ࣮ ࢩ ࣙ ࣥ 㸦 MC: MultiConstellation㸧ᑐᛂࡍࡿⅬ㸪⌧⾜ࡢ L1 ᖏ ಙྕ㸪᪂ࡋࡃ L5 ᖏ ಙྕࢆ㏣ຍࡍࡿ 2 ࿘Ἴ㸦DF: Dual-Frequency㸧 ᑐᛂࡍࡿⅬ ࡛࠶ࡿ㸦ᅗ 2.2㸧ࠋMC ᑐᛂࡼࡿ⾨ᫍᩘࡢቑ ຍ㸪DF ᑐᛂࡼࡿ㧗⢭ᗘ࡞㟁㞳ᅪ㐜ᘏ᥎ᐃ ࡀᮇᚅ࡛ࡁࡿࡓࡵ㸪⯟✵⯟ἲ࠾ࡅࡿ GNSS ࡢ⏝ྍ⬟ᛶࡢྥୖࡀᮇᚅࡉࢀ࡚࠸ࡿࠋ ḟୡ௦ SBAS ࠾ࡅࡿ ⢭ᗘྥୖࡢࡓࡵࡢ ⿵ṇ᪉ᘧࡣ㸪⌧⾜ SBAS ᇶᮏⓗྠᵝ࡛࠶ࡾ㸪 ⯟ἲ࣓ࢵࢭ࣮ࢪྵࡲࢀࡿ⾨ᫍ㌶㐨࣭ィࡢㄗ ᕪሗࢆᨺ㏦ࡍࡿࡇ࡛ ⢭ᗘࡢྥୖࢆᅗࡿࠋ ࡞࠾㸪DF ᑐᛂࡍࡿࡇ࡛࣮ࣘࢨࡀ㟁㞳 ᅪఏᦙ㐜ᘏ㔞ࡢ᥎ᐃࡀྍ⬟࡞ࡿࡓࡵ㸪㟁㞳ᅪ 㐜ᘏ⿵ṇࡣᨺ㏦ࡉࢀ࡞࠸ぢ㎸ࡳ࡛࠶ࡿࠋ 2.3 ḟୡ௦ SBAS ࡢ᳨ウㄢ㢟 SBAS IWG ࡛ࡣ㸪ḟୡ௦ SBAS ࡢつ᱁ྥ ࡅࡓከࡃࡢㄢ㢟ࡘ࠸࡚┠ୗ᳨ウࡀ㐍ࡵࡽࢀ࡚ ࠸ࡿࠋᮏሗ࡛ࡣ㸪ࡑࢀࡽ᳨ウㄢ㢟ࡢ 1 ࡘࡋ࡚㸪 ḟୡ௦ SBAS ࡀ⿵ᙉࡍࡿ⯟ἲ࣓ࢵࢭ࣮ࢪࡢ㑅ᢥ ࡘ࠸࡚㆟ㄽࡍࡿࠋᮏㄢ㢟ࡣ㸪⌧⾜ SBAS ࡛ࡣ ⯟ἲ࣓ࢵࢭ࣮ࢪࡋ࡚㸪GPS ࡢ L1-C/A ಙྕ࡛ ᨺ㏦ࡉࢀ࡚࠸ࡿᚑ᮶ࡢ⯟ἲ࣓ࢵࢭ࣮ࢪ㸦LNAV: Legacy Navigation Message㸧ࡢࡳ⏝ྍ⬟࡛࠶ ࡿࡓࡵ㸪ࡑࡢㄗᕪሗࢆ᥎ᐃ࣭ᨺ㏦ࡋ࡚࠸ࡿࠋ ࡑࢀᑐࡋ࡚ḟୡ௦ SBAS ࡛ࡣ㸪L5 ᖏ ಙ ྕࢆ᪂ࡓ⏝ࡍࡿࡇࡀ࡛ࡁࡿࡓࡵ㸪ࡑࢀ 㔜 ␚ ࡉ ࢀ ࡓ ᪂ ࡋ ࠸ ⯟ ἲ ࣓ ࢵ ࢭ ࣮ ࢪ 㸦 CNAV: Civil Navigation Message㸧 LNAV ࡢ 2 ࡘࡢ⯟ ἲ࣓ࢵࢭ࣮ࢪᑐࡋ࡚⿵ᙉሗࢆసᡂࡍࡿࡇ ࡀྍ⬟࡛࠶ࡿࠋࡑࡢࡓࡵ㸪ࡕࡽࡢ⯟ἲ࣓ࢵ ࢭ࣮ࢪᑐࡋ࡚⿵ᙉሗࢆసᡂࡋᨺ㏦ࡍࡿỴ ᐃࡍࡿᚲせࡀ࠶ࡿ࠸࠺᳨ウㄢ㢟࡛࠶ࡿࠋ >ϭᖏ ಙྕ 䝴䞊䝄 ᆅୖཷಙᶵ䝛䝑䝖䝽䞊䜽 ᅗ 2.1 ⌧⾜ SBAS ࡢᴫせ >ϭᖏ ಙྕ >ϱᖏ ಙྕ 'ĂůŝĞŽ 䝴䞊䝄 ᆅୖཷಙᶵ䝛䝑䝖䝽䞊䜽 ᅗ 2.2 ḟୡ௦ SBAS ࡢᴫせ 3 ⯟ἲ࣓ࢵࢭ࣮ࢪ ⯟ἲ࣓ࢵࢭ࣮ࢪࡣ㸪GPS ⾨ᫍࡢ⨨ሗ ࡸ㸪ᦚ㍕ࡋ࡚࠸ࡿཎᏊィࡢ GPST ᑐࡍࡿㄗ ᕪሗ࡛࠶ࡿࠋࡇࢀࡽࡣ ㊥ಙྕ㔜␚ࡉࢀ ࣮ࣘࢨᨺ㏦ࡉࢀ࡚࠾ࡾ㸪L1-C/A ಙྕ L5 ಙ ྕ࡛ᨺ㏦ࡉࢀࡿ⯟ἲ࣓ࢵࢭ࣮ࢪࢆࡑࢀࡒࢀ LNAV CNAV ࡪࠋ GPS ࡢ୍⯡ⓗ࡞ ᡭἲ࡛࠶ࡿ༢⊂ ࡛ ࡣ㸪⯟ἲ࣓ࢵࢭ࣮ࢪࡽィ⟬࡛ࡁࡿ⾨ᫍࡢ⨨ ィࡀṇ☜᪤▱࡛࠶ࡿ⪃࠼࡚㸪⾨ᫍ㸫ཷ ಙᶵ㛫ࡢ㊥㞳ࢆಙྕࡢఏᦙ㛫ࡽ᥎ᐃࡍࡿࡇ ࡛㸪ཷಙᶵ⨨ࢆ ࡍࡿࠋ ─ 73 ─ 電子航法研究所研究発表会（第16回平成28年６月） 3.1 Legacy Navigation Massage (LNAV) LNAV ࡣ GPS ࡢ L1 ࿘ Ἴ ᩘ ᖏ 㸦 1575.42 [MHz]㸧ࡢ L1-C/A ࡤࢀࡿ ಙྕ࡛ఏ㏦ ㏿ᗘ 50 [bps]࡛ᨺ㏦ࡉࢀ࡚࠾ࡾ㸪ᚑ᮶ࡢ GPS ༢ ⊂ ࡸ㸪⌧⾜ SBAS ࡛⏝ࡉࢀ࡚࠸ࡿࠋ ⯟ἲ࣓ࢵࢭ࣮ࢪࡣ㸪⾲ 3.1 ♧ࡍ 15 ಶࡢ⾨ ᫍ㌶㐨せ⣲㸦࢚ࣇ࢙࣓ࣜࢫ㸧࢚ࣇ࢙࣓ࣜࢫඖ ᮇ toe㸪3 ḟࡢ⾨ᫍィ⿵ṇ㡯࠾ࡼࡧィ⿵ṇࡢ ඖᮇ toc ࢆᨺ㏦ࡋ࡚࠸ࡿࠋ⾨ᫍ⨨࣭ィㄗᕪ ࡢィ⟬㛵ࡍࡿヲ⣽ࡣ GPS ࡢ ICD[5]グ㍕ࡉ ࢀ࡚࠸ࡿࠋࡲࡓ㸪LNAV ࡣ⯟ἲ࣓ࢵࢭ࣮ࢪࡢⓎ ⾜␒ྕ㸦IOD: Issue of Data㸧ࢆᨺ㏦ࡋ࡚࠾ࡾ㸪 ࡇࢀࢆ⏝ࡍࡿࡇ࡛㸪࣮ࣘࢨࡣ࢚ࣇ࢙࣓ࣜࢫ ࡢ㌶㐨せ⣲ࡢ್ࡀኚ᭦㸦᭦᪂㸧ࡉࢀࡓሙྜࡢุ ูࡸ㸪࢚ࣇ࢙࣓ࣜࢫࡢሗࢭࢵࢺࡢࣂ࣮ࢪࣙࣥ ⟶⌮࡞ࡀྍ⬟࡛࠶ࡿࠋ 3.2 Civil Navigation Massage (CNAV) CNAV ࡣ L5 ࿘Ἴᩘᖏ㸦1176.45 [MHz]㸧ࡢ I ┦㸦In-phase㸧࡛ L5I5 ࡤࢀࡿ ಙྕ࡛ఏ ㏦㏿ᗘ 50[bps]࡛ᨺ㏦ࡉࢀ㸪2013 ᖺࡽᐇ㝿 ᨺ㏦ࢸࢫࢺ ࡀ⾜ࢃࢀ࡚ ࠸ࡿ[7]ࠋࡲ ࡓ㸪CNAV 㛵ࡍࡿヲ⣽ࡣ㸪GPS ࡢ L5 ᖏಙྕ㛵ࡍࡿ ICD[6]グ㍕ࡉࢀ࡚࠸ࡿࠋ ࡇࡇ࡛㸪L5 ᖏ࡛ࡣ L5I5 ಙྕࡣู㸪Q ┦ 㸦Quadrature-phase㸧࠾࠸࡚㸪L5Q5 ࡤࢀ ࡿ ಙྕࡶᨺ㏦ࡉࢀ࡚࠸ࡿࠋࡇࡢෆ㸪CNAV ࡣ L5I5 ಙྕࡢࡳ㔜␚ࡉࢀ࡚࠾ࡾ㸪L5I5 ಙྕ ࡣࢹ࣮ࢱಙྕࡶࡤࢀࡿࠋࡑࢀᑐࡋ࡚㸪 L5Q5 ಙྕࡣࢹ࣮ࢱࡀ㔜␚ࡉࢀ࡞࠸ࡓࡵ㸪ࣃ ࣟࢵࢺಙྕࡶࡤࢀ㧗⢭ᗘ࡞ ㊥⬟ຊࡀᮇᚅ ࡉࢀ࡚࠸ࡿ[8]ࠋࡘࡲࡾ㸪CNAV ࢆ⏝ࡋࡓ ࢆ⾜࠺ሙྜ㸪L5I5 ಙྕࡢࢺࣛࢵ࢟ࣥࢢࡀᚲ せ࡛࠶ࡾ㸪㧗⢭ᗘ࡞ ㊥ࡀᮇᚅࡉࢀ࡚࠸ࡿ L5Q5 ಙྕࢆ⏝ࡍࡿࡓࡵࡣ㸪᭦ಙྕ㏣ᑿ ࣮ࣝࣉࡢ㏣ຍࡀᚲせ࡛࠶ࡿⅬ㸪ὀពࢆせࡍࡿࠋ CNAV ࡢ⾨ᫍィ࣭㌶㐨ሗࡣ㸪LNAV ࢆඖ 㧗⢭ᗘࡀᅗࡽࢀ࡚࠾ࡾ㸪࡞ኚ᭦ࡋ࡚㸪⾲ 3.1 ♧ࡍ LNAV ࡢ⾨ᫍ㌶㐨せ⣲㸪⾲ 3.2 ♧ࡍ㌶㐨せ⣲ࡀ᪂ࡓ㏣ຍࡉࢀ࡚࠸ࡿࠋ࡞࠾㸪 ⾲ 3.1 ࡢ ㌶ 㐨 㛗 ༙ ᚄ ࡢ ᰿ Aࡣ 㸪 ᇶ ‽ 㛗 ༙ ᚄ AREF㸦= 26,559,710 [m]㸧ࡽࡢᕪ'A ࢆ⏝࠸࡚ ᘧ(3.1)ࡢࡼ࠺ኚ᭦ࡉࢀ࡚࠸ࡿࠋࡲࡓ㸪LNAV ࡀⓎ⾜ࡋ࡚࠸ࡿ IOD ࡀ CNAV ࡛ࡣⓎ⾜ࡉࢀ࡞ ࠸Ⅼὀពࢆせࡍࡿࠋ 2 A | AREF 'A (3.1) ᪂ࡓ㏣ຍࡉࢀࡓ⾲ 3.2 ࡢ㌶㐨せ⣲ࡣ㸪ࡑ ࢀࡒࢀᘧ(3.2)㸪ᘧ(3.3)♧ࡍᵝ㸪้ tk ࠾ ࡅࡿ㌶㐨㛗༙ᚄ Ak ᖹᆒ㐠ື nk ࢆ࢚ࣇ࢙࣓ࣜ ࢫඖᮇ toe ࡽ㛫ఏࡋ࡚ồࡵࡿ㝿⏝ࡉ ࢀࡿࠋ࡞࠾㸪n0 ࡣඖᮇ toe ࠾ࡅࡿᖹᆒ㐠ື [SC/s]࡛࠶ࡿࠋ Ak AREF 'A A t k t oe (3.2) nk 1 n0 'n0 'n0 tk toe 2 (3.3) ⾲ 3.1 LNAV ⾨ᫍ㌶㐨࣭ィせ⣲ M0 ᖹᆒ㏆Ⅼゅ 'n0 ᖹᆒ㐠ືࡢ⿵ṇ್ e A 㞳ᚰ⋡ ㌶㐨㛗༙ᚄࡢ᰿ SC SC/s m :0 ᪼Ⅼ㉥⤒ SC SC i0 ㌶㐨ഴᩳゅ Z ㏆ᆅⅬᘬᩘ Wլ ᪼Ⅼ㉥⤒ࡢ㛫ኚ⋡ SC/s ø ㌶㐨ഴᩳゅࡢ㛫ኚ⋡ SC/s SC Cuc ⦋ᗘᘬᩘࡢవᘻㄪ⿵ṇ㡯ࡢᖜ rad Cus ⦋ᗘᘬᩘࡢṇᘻㄪ⿵ṇ㡯ࡢᖜ rad Crc ㌶㐨༙ᚄࡢవᘻㄪ⿵ṇ㡯ࡢᖜ m Crs ㌶㐨༙ᚄࡢṇᘻㄪ⿵ṇ㡯ࡢᖜ m Cic ㌶㐨ഴᩳゅࡢవᘻㄪ⿵ṇ㡯ࡢᖜ rad Cis ㌶㐨ഴᩳゅࡢṇᘻㄪ⿵ṇ㡯ࡢᖜ rad toe ࢚ࣇ࢙࣓ࣜࢫࡢඖᮇ s af0 ⾨ᫍィࣂࢫ s af1 ⾨ᫍィࢻࣜࣇࢺ s/s af2 ⾨ᫍィࢻࣜࣇࢺ࣮ࣞࢺ s/s2 toc ⾨ᫍィሗࡢඖᮇ s ⯟ἲ࣓ࢵࢭ࣮ࢪࡢⓎ⾜␒ྕ - IOD SC: semi-circles (1 SC = 180 deg =Srad) ⾲ 3.2 CNAV ⾨ᫍ㌶㐨せ⣲ࡢኚ᭦Ⅼ '$ к '۪0 ㌶㐨㛗༙ᚄࡢᇶ‽ AREF ࡽࡢᕪ ㌶㐨㛗༙ᚄࡢ㛫ኚ⋡ ᖹᆒ㐠ື⿵ṇ್ࡢ㛫ኚ⋡ m m/s SC/s2 LNAV ࡣ␗࡞ࡾ A࠾ࡼࡧ IOD ࡣᨺ㏦ࡉࢀ࡞࠸ 4 CNAV ࡢホ౯ CNAV ࡢḟୡ௦ SBAS ࠾ࡅࡿ⏝ྍ⬟ᛶホ ౯ࡋ࡚㸪⾨ᫍ㌶㐨࣭ィ⢭ᗘࢆホ౯ࡍࡿࡇ ࡛㸪CNAV ࢆ⿵ᙉࡍࡿࡇࡢ࣓ࣜࢵࢺࢆホ౯ࡋ㸪 CNAV ࡢ⏝క࠺ࢹ࣓ࣜࢵࢺࡢホ౯ࡋ࡚㸪 L5 ᖏ I-Q ┦ࡢಙྕ㑅ᢥࡢၥ㢟ࡘ࠸࡚㏙ࡿࠋ ─ 74 ─ 電子航法研究所研究発表会（第16回平成28年６月） ྛⅬࡢ⾨ᫍ㌶㐨ࡣඖᮇ toe ࡀ᭱ࡶ㏆࠸⯟ἲ ࣓ࢵࢭ࣮ࢪࢆ⏝ࡋ࡚ồࡵ࡚࠸ࡿࡓࡵ㸪ඖᮇ toe ࢆ୰ᚰࡋࡓ 2 㛫㛫㝸ࡢ⯟ἲ࣓ࢵࢭ࣮ࢪ ࡢษࡾ᭰࠼ࡀ㸪ᅗ୰ㄗᕪࡀ㐃⥆࡞Ⅼࡋ࡚ ⾲ࢀ࡚࠸ࡿࠋࡲࡓ㸪LNAV ࡛ࡣ 04:00㸪CNAV ࡛ࡣ 03:30 ࡢඖᮇ㏆࡛⏕ࡌ࡚࠸ࡿㄗᕪࡢ㐃 ⥆Ⅼࡣ㸪ࡇࡢⅬ࡛▷࠸㛫㝸࡛⯟ἲ࣓ࢵࢭ࣮ࢪ ࡢ᭦᪂ࡀ⾜ࢃࢀࡓࡓࡵ⏕ࡌ࡚࠸ࡿࠋ ᅗ 4.2 ࠾ࡼࡧ⾲ 4.2 ࡢ PRN06 ⾨ᫍࡢࡽ ศࡿࡼ࠺㸪LNAV CNAV ࡣ㛗ᮇⓗࡣ ྠᵝࡢㄗᕪഴྥࢆᣢࡘࡶࡢࡢ㸪CNAV ࡣඖᮇࢆ ୰ᚰࡋࡓ๓ᚋ 1 㛫ࡢㄗᕪኚືࡀ LNAV ẚ࡚ᑠࡉ࠸ࡇࡀศࡿࠋ LNAV CNAV ࡢྛ⾨ᫍ㌶㐨ࡢࣛࢪࣝ᪉ ྥㄗᕪࢆᅗ 4.1 ♧ࡍࠋࡲࡓ㸪ࡑࢀࡒࢀࡢ⾨ ᫍ㌶㐨ㄗᕪࡢ RMS㸦Root Mean Square㸧ࢆ⾲ 4.2 ♧ࡍࠋᅗ 4.1㸪⾲ 4.2 ࡼࡿ㸪LNAV CNAV ࡣ 1 ᪥ࡢ㛗㛫ࡢ⠊ᅖ࡛ࡣࡁ࡞ᕪ ࡀぢࡽࢀ࡞࠸ࡇࡀࢃࡿࠋ ḟ㸪LNAV CNAV ࡢᕪࡢ୍ࡋ࡚㸪 ᅗ 4.1 ୰ࡢ GPS ࡢ 6 ␒⾨ᫍ㸦PRN06㸧ࡘ࠸ ࡚㸪ࡑࡢ㌶㐨ࡢࣛࢪࣝ᪉ྥㄗᕪࢆᅗ 4.2 ♧ࡋ㸪RMS ㄗᕪࢆ⾲ 4.2 ྜࢃࡏ࡚♧ࡍࠋ࡞ ࠾㸪ᅗ୰⦪ࡢ୍Ⅼ㙐⥺࡛♧ࡍⅬࡣ㸪ࡑࢀࡒࢀ LNAV CNAV ࡢྛ⯟ἲ࣓ࢵࢭ࣮ࢪࡢඖᮇ toe ࢆ⾲ࡋ࡚࠸ࡿࠋ ─ 75 ─ ᅗ 4.1 ⾨ᫍࡢࣛࢪࣝ᪉ྥㄗᕪࡢẚ㍑ Radial orbit errors m 4.1 ⾨ᫍ㌶㐨࣭ィ⢭ᗘホ౯ ḟୡ௦ SBAS ࠾࠸࡚ CNAV ࢆ⿵ᙉࡍࡿࡇ ࡼࡗ࡚ᚓࡽࢀࡿ࣓ࣜࢵࢺࢆ᫂ࡽࡍࡿࡇ ࢆ┠ⓗࡋ࡚㸪CNAV ࡢ⾨ᫍ㌶㐨࣭ィ⢭ᗘ ࢆホ౯ࡍࡿࠋ ල య ⓗ ࡣ 㸪 IGS 㸦 International GNSS Service㸧[9]ࡀᥦ౪ࡍࡿ⢭ᐦᬺ㸦IGS Final㸧 ࡤࢀࡿ㸪⾲ 4.1 ♧ࡍᵝ㧗⢭ᗘ࡞⾨ᫍ㌶ 㐨࣭ィሗࢆࣜࣇࣞࣥࢫࡋ࡚㸪2015 ᖺ 11 ᭶ 9 ᪥ 0:00 㹼 24 㸸 00 㸦 GPST 㸧 ࠾ ࡅ ࡿ CNAV ࡢ⾨ᫍ㌶㐨࣭ィ⢭ᗘࢆホ౯ࡍࡿࠋホ౯ ⏝࠸ࡿ⾨ᫍࡣ㸪GPS Block-IIRM ⾨ᫍ㸦7 ᶵ㸪 PRN: 05, 07, 12, 15, 17, 29, 31㸧࠾ࡼࡧ Block-IIF ⾨ᫍ㸦10 ᶵ㸪PRN: 01, 03, 06, 08, 09, 24, 25, 26, 27, 30㸧࡛࠶ࡿࠋࡇࢀࡽࡣ㸪CNAV ࢆ㔜␚ࡋ࡚ ࠸ࡿ L2C ಙྕࡶࡋࡃࡣ L5 ಙྕࢆᨺ㏦ࡋ࡚࠸ࡿ ⾨࡛ᫍ࠶ࡾ㸪CNAV ࡣୖグࡢ⾨ᫍࡘ࠸࡚ࡢࡳ ᨺ㏦ࡉࢀࡿࠋ ホ౯࡛ࡣ⾨ᫍ㌶㐨ㄗᕪࡢ࠺ࡕ᭱ࡶ ᙳ㡪 ࡍࡿせ⣲ࡋ࡚㸪㌶㐨ࡢࣛࢪࣝ᪉ྥㄗᕪࢆホ ౯ࡍࡿࠋࡲࡓ⾨ᫍィࡘ࠸࡚㸪⯟ἲ࣓ࢵࢭ࣮ ࢪ࡛⿵ṇࡋࡓ⾨ᫍᦚ㍕ࡉࢀࡓཎᏊィࡢ้ GPST ࡢᕪࢆ㸪ග㏿ࢆࡌ࡚㊥㞳ࡢḟඖࡋ ࡚ホ౯ࡍࡿࠋ ホ౯ࡢᵓᡂࡋ࡚㸪➨ 4.1.1 㡯࠾࠸࡚ᚑ᮶ ◊✲[1][2]ྠᵝ㸪GPS ༢⊂ ࡛⏝࠸ࡿࡇ ࢆᐃࡋࡓ༢⣧࡞⾨ᫍ㌶㐨࣭ィ⢭ᗘࡢホ౯ ࢆ⾜࠸㸪➨ 4.1.2 㡯࠾࠸࡚ḟୡ௦ SBAS ࠾ ࡅࡿ CNAV ⿵ᙉࡢຠᯝࡘ࠸࡚ホ౯ࡍࡿࠋ 4.1.1 ⾨ᫍ㌶㐨࣭ィ⢭ᗘ ⾨ᫍ㌶㐨⢭ᗘホ౯ D ᅗ 4.2 ⾨ᫍ㌶㐨ㄗᕪࡢẚ㍑㸦PRN06㸧 ⾲ 4.1 IGS ⢭ᐦᬺࡢᵝ ⾨ᫍ㌶㐨⢭ᗘ 㹼2.5 cm ⾨ᫍ㌶㐨᭦᪂࿘ᮇ 15 min RMS㸸㹼75 ps㸦Ҹ2.3 cm㸧 ⾨ᫍィ⢭ᗘ SDev㸸㹼20 ps㸦Ҹ0.6 cm㸧 ⾨ᫍィ᭦᪂࿘ᮇ 30 s ⾲ 4.2 ⾨ᫍ㌶㐨࣭ィㄗᕪ㸦RMS㸧 LNAV CNAV ㌶㐨 m ィ m ㌶㐨 m ィ m ⾨ᫍ 0.155 0.534 0.148 0.534 PRN06 0.073 0.129 0.071 0.087 電子航法研究所研究発表会（第16回平成28年６月） E ⾨ᫍィ⢭ᗘホ౯ LNAV CNAV ࡢྛ⾨ᫍィࡢㄗᕪ㸪ࡑ ࡢ RMS ࢆᅗ 4.3㸪⾲ 4.2 ♧ࡍࠋᅗ 4.3㸪⾲ 4.2 ࡼࡿ㸪CNAV LNAV ࡣ 1 ᪥ࡢ㛗㛫 ࡢ⠊ᅖ࡛ࡣࡁ࡞ᕪࡀぢࡽࢀ࡞࠸ࡇࡀࢃࡿࠋ ࡋࡋ࡞ࡀࡽ㸪ᅗ 4.3 ୰ࡢ Block-IIRM ⾨ᫍ㸪 ࠾ࡼࡧࢭࢩ࣒࢘ཎᏊィࢆᦚ㍕ࡍࡿ୍㒊ࡢ Block-IIF ⾨ᫍ㸦PRN: 08, 24㸧ࡘ࠸࡚ࡣ㸪ᦚ ㍕ࡉࢀ࡚࠸ࡿཎᏊィࡢࣀࢬࡀࡁࡃ㸪 LNAV CNAV ࡢẚ㍑ࡀᅔ㞴࡛࠶ࡿࠋࡑࡇ࡛ ࡋ࡚㸪ᅗ 4.4 ィࣀࢬࡢᑠࡉ࠸ BlockIIF ⾨ᫍ㸦PRN: 06㸧ࡢ⾨ᫍィㄗᕪࡢẚ㍑ࢆ♧ ࡋ㸪⾲ 4.2 ࡑࡢ RMS ㄗᕪࢆྜࢃࡏ࡚♧ࡍࠋ ࡞࠾㸪ᅗ 4.4 ♧ࡍ⦪ࡢ୍Ⅼ㙐⥺ࡣ㸪ᅗ 4.2 ྠᵝྛ⯟ἲ࣓ࢵࢭ࣮ࢪࡢඖᮇ toe ࢆ⾲ࡍࠋ PRN06 ⾨ᫍࡢࡽศࡿࡼ࠺㸪LNAV CNAV ࡣ㛗ᮇⓗࡣྠᵝࡢㄗᕪഴྥࢆᣢࡘࡶࡢ ࡢ㸪CNAV ࡣඖᮇ toe ࢆ୰ᚰࡋࡓ๓ᚋ 1 㛫 ࡢㄗᕪኚືࡀᑠࡉ࠸ࡇࡀศࡿࠋ 4.1.2 SBAS ࠾ࡅࡿ CNAV ࡢຠᯝ ᮏ 㡯 ࡛ ࡣ SBAS ࠾ ࡅ ࡿ ⏝ ࡢ ほ Ⅼ ࡽ CNAV ࢆホ౯ࡍࡿࠋSBAS ࡛ࡣ⾨ᫍ㌶㐨࣭ィ ㄗᕪࢆ⿵ṇࡍࡿᶵ⬟ࢆᣢࡘࡓࡵ㸪➨ 4.1.1 㡯࡛ ᫂ࡽ࡞ࡗࡓ㸪LNAV CNAV ࡢㄗᕪࡢᕪ ࡣࡑࢀࡒࢀ⿵ṇࡉࢀ㸪ၥ㢟࡞ࡽ࡞࠸ࠋၥ㢟 ࡞ࡿࡢࡣ㸪SBAS ࡼࡿ⿵ṇࡢ᭦᪂㛫㝸࠾ࡅ ࡿㄗᕪኚື㔞ࡢࡁࡉ࡛࠶ࡿࠋࡑࡇ࡛㸪ᅗ 4.1 ᅗ 4.3 ♧ࡍ⾨ᫍ㌶㐨࣭ィㄗᕪࡘ࠸࡚㸪 SBAS ࡼࡿ⿵ṇࡢ᭦᪂㛫㝸࠾ࡅࡿㄗᕪኚື 㔞ࢆホ౯ࡍࡿࠋලయⓗࡣ㸪ḟୡ௦ SBAS ࡢ ICD ࢻࣛࣇࢺ∧[4]ࡼࡿ㸪⿵ṇ࣓ࢵࢭ࣮ࢪ ࡢ᭷ຠᮇ㝈ࡀ 240 ⛊࡛࠶ࡿࡇࡽ㸪⿵ṇࡢ᭦ ᪂࿘ᮇࢆ 240 ⛊௬ᐃࡍࡿࠋࡑࡋ࡚ࡑࡢ㛫ࡢㄗ ᕪኚື㔞ࢆ㸪௵ពࡢ้ࡑࡢ 240 ⛊ᚋࡢ⾨ᫍ ㌶㐨࣭ィㄗᕪࡢᕪࡽồࡵ㸪ࡑࡢࣄࢫࢺࢢࣛ ࣒ࢆࡑࢀࡒࢀᅗ 4.5㸪ᅗ 4.6 ♧ࡍࠋ ᅗ 4.5㸪ᅗ 4.6 ࡼࡿ㸪CNAV ࡢㄗᕪኚື 㔞ࡣ LNAV ẚ㍑ࡋ࡚ᑠࡉ࠸ࡀ㸪ࡑࡢ㒊ศ ࡀ 1㹼2 [cm]௨ୗ࡛࠶ࡿࡇࡀศࡿࠋ ࡇࢀࡽࡀḟୡ௦ SBAS ࠾ࡅࡿ㌶㐨ࡢ⨨⿵ ṇ ศ ゎ ⬟ 0.0625 [m] ィ ⿵ ṇ ศ ゎ ⬟ 0.03125[m]ࡼࡾࡶᑠࡉ࠸ࡇࡽ㸪CNAV ⏝ ࡼࡿ⾨ᫍ㌶㐨࣭ィࡢㄗᕪኚືࡢᨵၿຠᯝࡣ ᑠࡉࡃ㸪ḟୡ௦ SBAS ࠾࠸࡚㸪CNAV ⏝ࡢ ࣓ࣜࢵࢺࡀࡁࡃ࡞࠸ࡇࡀศࡿࠋ Clock errors m ᅗ 4.3 ⾨ᫍࡢィㄗᕪࡢẚ㍑ ᅗ 4.5 240 ⛊㛫ࡢ㌶㐨ㄗᕪኚືࡢࣄࢫࢺࢢ࣒ࣛ ᅗ 4.4 ⾨ᫍィㄗᕪࡢẚ㍑㸦PRN06㸧 ௨ୖࡽ㸪㏻ᖖࡢ༢⊂ ࠾ࡅࡿ⏝ࢆ๓ ᥦࡋࡓホ౯࠾࠸࡚㸪᪤Ꮡ◊✲ྠᵝ㸪 CNAV ࡣ ⾨ ᫍ ㌶ 㐨 ࣭ ィ ㄗ ᕪ ࡢ ▷ ᮇ ኚ ື ࡀ LNAV ẚ㍑ࡋ࡚ᑠࡉࡃ㸪㧗⢭ᗘ࡛࠶ࡿࡓࡵ᭷ ⏝࡛࠶ࡿࡇࡀ᫂ࡽ࡞ࡗࡓࠋ ᅗ 4.6 240 ⛊㛫ࡢィㄗᕪኚືࡢࣄࢫࢺࢢ࣒ࣛ ─ 76 ─ 電子航法研究所研究発表会（第16回平成28年６月） 4.2 CNAV ⏝ࡢᙳ㡪ホ౯ CNAV ࢆ⏝ࡍࡿࡇ࡛⏕ࡌࡿ㸪⾨ᫍ㌶㐨࣭ ィ⢭ᗘ௨እࡢᙳ㡪ࡘ࠸࡚㏙ࡿࠋ ➨ 3.2 ⠇࡛ࡶ㏙ࡿࡼ࠺㸪CNAV ࡣ L5 ᖏ I ┦ಙྕ㸦L5I5㸧࡛ᨺ㏦ࡉࢀ࡚࠸ࡿࡓࡵ㸪CNAV ࢆ⏝ࡍࡿሙྜࡣ L5I5 ಙྕࡢࢺࣛࢵ࢟ࣥࢢ ࡀᚲ㡲࡛࠶ࡾ㸪L5 ᖏࡢࡶ࠺୍ࡘࡢ ಙྕ࡛ ࠶ࡿ Q ┦ಙྕ㸦L5Q5㸧ࢆ⏝ࡍࡿࡇࡀ࡛ࡁ ࡞ࡃ࡞ࡿࠋࡋࡋ࡞ࡀࡽ㸪L5Q5 ಙྕࡣ㸪ࢹ࣮ ࢱࢆ㔜␚ࡋ࡞࠸ࣃࣟࢵࢺಙྕ࡛࠶ࡿࡓࡵ㸪㧗 ⢭ᗘ࡞ ㊥⬟ຊࢆ᭷ࡋ࡚࠾ࡾ㸪 ⢭ᗘྥୖࡢ ࡓࡵ✚ᴟⓗ࡞⏝ࡀᮃࡲࢀ࡚࠸ࡿಙྕ࡛࠶ࡿࠋ ࡑࡇ࡛㸪CNAV ࢆ⏝ࡋ㸪᭦ L5Q5 ಙྕࢆ ⏝ࡋࡼ࠺ࡍࡿࡓࡵࡣ㸪ಙྕ㏣ᑿ࣮ࣝࣉࢆ᪂ ࡓ㏣ຍࡍࡿᚲせࡀ࠶ࡿࠋࡋࡋ࡞ࡀࡽ㸪ḟୡ ௦ SBAS ࡣ DFMC ࡼࡗ࡚㸪ྠ 30 ᶵࢆ ㉸࠼ࡿ⾨ᫍ[10]ࡢ 2 ࿘Ἴಙྕࡢཷಙࡀᚲせ࡞ሙ ྜࡀᐃࡉࢀࡿࠋࡑࡢࡼ࠺࡞୰࡛㸪L5Q5 ⏝ࡢ ಙྕ㏣ᑿ࣮ࣝࣉࢆ᭦㏣ຍࡍࡿࡇࡣ㸪ཷಙᶵ 〇㐀ࢥࢫࢺࡢቑࢆᣍࡃ⪃࠼ࡿࠋ ࡘࡲࡾ㸪ḟୡ௦ SBAS ࠾࠸࡚ CNAV ࢆ ⏝ࡍࡿࡇࡣ㸪㧗⢭ᗘ࡞ L5Q5 ಙྕࡀ⏝࡛ࡁ ࡞ࡃ࡞ࡿ㸪ࡶࡋࡃࡣ L5Q5 ಙྕ⏝ࡢಙྕ㏣ᑿ ࣮ࣝࣉࢆ᪂ࡓ㏣ຍࡍࡿᚲせࡀ࠶ࡾ㸪ཷಙᶵࢥ ࢫࢺࡢቑࢆᣍࡃ࠸࠺ࢹ࣓ࣜࢵࢺࡀ࠶ࡿࠋ 5 ⤖ゝ ᮏሗ࡛ࡣ㸪ḟୡ௦ SBAS ࠾ࡅࡿ⿵ᙉ㐺ࡍ ࡿ⯟ἲ࣓ࢵࢭ࣮ࢪࢆ᫂ࡽࡍࡿࡇࢆ┠ⓗ ࡋ࡚㸪LNAV CNAV ࡢホ౯ࢆ⾜ࡗࡓࠋ ⾨ᫍ㌶㐨࣭ィ⢭ᗘホ౯ࡢ⤖ᯝ㸪CNAV ࡣ LNAV ẚ㍑ࡋ࡚㧗⢭ᗘ࡛࠶ࡾ㸪༢⊂ ࠾ ࡅࡿ᭷⏝ᛶࡀ᫂ࡽ࡞ࡗࡓࠋࡋࡋ࡞ࡀࡽ㸪 SBAS ࡛ࡣ⯟ἲ࣓ࢵࢭ࣮ࢪࡢㄗᕪࢆ⿵ṇࡍࡿࡓ ࡵ㸪⾨ᫍ㌶㐨࣭ィࡢ⢭ᗘᕪࡀ࠼ࡿᙳ㡪ࡣᑠ ࡉࡃ㸪LNAV CNAV ࡛᭷ព࡞ᕪࡀ⌧ࢀ࡞࠸ ࡇࡀ᫂ࡽ࡞ࡗࡓࠋࡲࡓ㸪CNAV ࡢ⏝ ࡼࡗ࡚⏕ࡌࡿᙳ㡪ࢆホ౯ࡋࡓ⤖ᯝ㸪CNAV ࢆ ⏝ࡍࡿࡇ࡛㸪㧗⢭ᗘ࡞ L5Q5 ಙྕࡀ⏝࡛ࡁ ࡞ࡃ࡞ࡿ㸪ࡶࡋࡃࡣ L5Q5 ಙྕ⏝ࡢࡓࡵ ᭦ಙྕ㏣ᑿ࣮ࣝࣉࡢ㏣ຍࡀᚲせ࡛࠶ࡿ࠸࠺ ࢹ࣓ࣜࢵࢺࡀ᫂ࡽ࡞ࡗࡓࠋ ௨ୖࡽ㸪LNAV CNAV ࡣ㸪ࡑࡢ⢭ᗘ ࠾࠸࡚᭷ព࡞ᕪࡀ⌧ࢀࡎ㸪ࡲࡓ㸪CNAV ࡢ⏝ ࡣ㧗⢭ᗘ࡞ L5Q5 ಙྕࡢ⏝ࡀᅔ㞴࡞ࡿ࠸ ࠺ࢹ࣓ࣜࢵࢺࡀ࠶ࡿࡓࡵ㸪ḟୡ௦ SBAS ࠾ࡅ ࡿ⿵ᙉ࡛ࡣ LNAV ࢆ⏝ࡍࡿࡇࡀ㐺ษ࡛࠶ ࡿ⪃࠼ࡿࠋ ᮏ◊✲࡛ࡣ㸪௨ୖࡢ⤖ᯝࢆ SBAS IWG ᥦ ゝࡋ㸪ᚋࡣ LNAV ࢆ⏝ࡋࡓḟୡ௦ SBAS ࡢ㛤Ⓨࢆᐇࡍࡿணᐃ࡛࠶ࡿࠋ ཧ⪃ᩥ⊩ [1] P. Steigenberger, O. Montenbruck, and U. Hessels, "Performance Evaluation of the Early CNAV Navigation Message", NAVIGATION, Vol. 62, No. 3, pp. 219-228, Fall 2015. >@ H. Yin, Y.T. Morton, M. Carroll, and E. Vinande, "Performance Analysis of L2 and L5 CNAV Broadcast Ephemeris for Orbit Calculation", NAVIGATION, Vol. 62, No. 2, pp. 121-130, Summer 2015. [3] International Standards and Recommended Practices, Annex 10 to the Convention on Civil Aviation: Aeronautical Telecommunications, Vol. I, 6th Ed., July 2006. [4] SBAS IWG, “Draft IWG SBAS L5 Interface Control Document (SBAS L5 ICD),” Issue 1, Rev. 1 Draft 036, March 2015. [5] IS-GPS-200H, Interface Specification: Navstar GPS Space Segment/Navigation User Interfaces. [6] IS-GPS-705D, Interface Specification: Navstar GPS Space Segment/User Segment L5 Interfaces. [7] “Global Positioning System Modernized Civil Navigation (CNAV) Live-Sky Broadcast Test Plan,” NAVCEN, 30 May 2013. [8] J.H. Won, M. Anhileri, B. Eissfeller, A. Schmitz-Peiffer, an J.J Floch, "Optimum Data Rate and Signal Power Split for Next Generation GNSS Architectures," Proc. ION GNSS, pp. 2942-2955, September 2009. [9] International GNSS Service ( http://www.igs.org/ ) [10] ࢪ ࣭ ࢜ ࢭ ࢽ ᆅ ᇦ GNSS ࣡ ࣮ ࢡ ࢩࣙࢵࣉඹྠᐇ㦂ᵓ㸪➨ 5 ᅇ‽ኳ㡬⾨ ᫍࢩࢫࢸ࣒࣮ࣘࢨ࣑࣮ࢸࣥࢢ㸪2010㸬 ─ 77 ─
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