GPS/GNSS: Satellite Navigation
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1 移動体における高精度測位技術に 関する現在と未来 MWE 月 日横浜パシフィコ位置情報サービス技術のフロンティア 久保信明 東京海洋大学 ) 1
2 発表概要 高精度測位の現状とこれから コンシューマ及びサーベイ受信機 他センサとの統合 低コスト受信機の結果 まとめ 2
3 Current GNSS Constellation GPS : 32 GLO : 23 BEI : 14 GAL : 8 QZS : 1 TUMSAT reference station 3
4 GPS の 2 周波は今も使いにくいか? これまで L2P という軍用コードが使われてきた 原則 北米以外の受信機メーカの参入が妨げられていた L2C の出現 32 機のうちすでに L2C を放送している衛星数は 18 機 2 周波は高精度測位に必要度が高い ⅡF ⅡR-M ⅡR ⅡA 合計
5 New GNSS Era : many more satellites in Asia Visible satellite number mas angle 3 degrees) 24 hours Disp. 22: GPS32)+ Glonass24)+ Galileo3)+ BeiDou35)+ QZSS4)+ IRNSS7)+ SBAS13)
6 移動体測位現状 Survey-grade GNSS+ Speed sensor + IMU Reliable RTK still requires dual-frequency Prospective accuracy in safety use for ITS lie lane recognition is said decimeter level with continuous positions 1m 5m 1m Low cost 1cm 1cm Target Accuracy #2 Product $1-1) #1 Product $2,).5m horizontal error and 1% availability 6
7 レーン検知と RTK の精度 実際の RTK 中の動画 7
8 Performance of low-cost receiver with single-frequency GPS/QZS/BeiDou Toyo Downtown Many syscrapers Google 上ではあるが自身の走行車線に一致 8
9 Low-cost receiver comparison GPS or GPS/QZS/BEI of same receiver) GPS GPS/QZS/BeiDou Toyo Downtown マルチ GNSS の効果は歴然 9
10 Low-cost receiver comparison GPS or GPS/QZS/BEI of same receiver) Bango Downtown Under elevated train GPS GPS/QZS/BeiDou マルチ GNSS の効果は歴然. さらにスピードセンサ +IMU があると? 1
11 Challenge in RTK Reliability as well as availability of RTK are quite important for future commercial users 1m RTK-GPS example in dense urban areas Marunouchi Toyo) Both reliability and availability were not enough We need to now the current power of RTK-GNSS exactly 11
12 We provide local-area CORS networ collaboration between universities) What you can do? CORSContinuously Operating Reference Stations) observation data via the Internet ToyoUniv. of Toyo, Keio Univ., TUMSAT) BangoThailand), ManilaPhilippine),JaartaIndonesia) You can get real-time precise position by RTK-GNSS Communication Lin SPS855 NetR9 Rover Reference 12
13 Mission of QZSS 13
14 Multi-GNSS RTK Test using Car Test Schedule 1 st 214/8/13 13:7 13:32 2 nd 214/8/13 17:26 17:52 3 rd 214/8/13 22:26 22:5 4 th 214/8/14 8:36 9:2 5 th 214/8/14 12:7 12:35 * GPS/QZS/GLONASS/GALILEO/BeiDou are entirely used in this test * Trimble SPS855 receiver was used * RTK : Trimble and Laboratory engine 14
15 Summary of Test Results Multi-GNSS RTK Trimble engine) Average NUS Fix rate Test % Test % Test % Test % Test % GPS VS. Multi-GNSS RTK Trimble engine) Test 5 Average NUS Fix rate GPS % Multi-GNSS % FIX rate comparison between GNSS combinations Laboratory engine) Test 3 G GJ GC GR GJC GJCR RTK FIX rate 48.2% 58.2% 55.5% 55.4% 64.7% 65.9% Velocity output 67.% 8.3% 86.5% 82.4% 91.5% 94.7% G:GPS J:QZSS C:BeiDou R:GLONASS The reason for small contribution of BeiDou/GLONASS to RTK was just due to the shortage of high elevation those satellites 15
16 Summary of Test Results Multi-GNSS RTK Trimble engine) GPS VS. Multi-GNSS RTK Trimble engine) Test 5 平均衛星数 Fix 率 GPS % Multi-GNSS % 平均衛星数 FIX 率データ遅延時間間隔 FIX rate comparison between GNSS combinations Laboratory engine) Test 3 G GJ GC GR GJC GJCR RTK FIX rate 48.2% 58.2% 55.5% 55.4% 64.7% 65.9% Velocity output 67.% 8.3% 86.5% 82.4% 91.5% 94.7% G:GPS J:QZSS C:BeiDou R:GLONASS The reason for small contribution of BeiDou/GLONASS to RTK was just due to the shortage of high elevation those satellites 16
17 RTK-GNSSとレファレンス解の差 Dense Urbanでの移動体 RTK-GNSSの信頼性は? 5 GPS/BEI/GLO/QZS 4 3 経度方向誤差 水平方向誤差 m 2 緯度方向誤差 FIX率は約6% GPS時刻 秒 水平5cm以内は99.88% 水平2cm以内でも99.82% 17
18 丸の内周辺のみの RTK-GNSS 214 年 1 月 26 日 13 時 1 分 14 時 4 分 5 周回昼食停止時間除く FIX 率は 41.2% 5 周回分の水平位置 18
19 RTK-GNSS とコンシューマレベルの IMU 及び車 速センサとの統合 プロテクションレベル ) Total 3 tests Period : about 3min Data rate : 1Hz Test NUS ave.) Number of used satellites. Trajectory Under pass 名古屋駅周辺都市部 19
20 RTK-GNSS Performance Sys. Availability GPS 25.8 % Max : 22.8 [s] 8 [m] GPS/QZS 37.3 % %) GPS/QZS/BDS 57.4 % +2.1 %) +QZS and BDS increased the availability a lot. About times compared with only GPS 2
21 Overall Results RTK 57.4% GNSS Vel. 16.3% DR 26.2% < 1.5m : % Max : 2.3 m 21
22 Protection Level Estimation The covariance ellipse by satellite constellation x 2 σ x 2 2ρ xy xy y2 σ x σ 2 y σ = 1 ρ xy 2 C y P = 1 exp C 2 Considered accumulating bias errors in GNSS-velocity and DR solutions. Parameter Value RTK-GNSS error m).25 GNSS-velocity error m/s).2 IMU+Speed sensor error m/s).3 22
23 受信機による違いがあるのか? 214 年 3 月 3 日 15 時台の3 分 場所は晴海と月島周回で車両移動体で取得 GPSの衛星配置は良くない アンテナはC 社 分岐してA 社とB 社を接続 平均可視衛星数 GPS/BeiDou/QZS 平均可視衛星数 GPS+BeiDou FIX 率 A 社 / 3.83 / % B 社 / 4.79 / % 解析エンジンは Lab. のもので 条件は全く同じ 23
24 基線長の影響 VRS と Single Baseline) 214/1/24 22 時頃成田空港から東関東自動車道を 1m 走行し PA へ Single Baseline の基線長は 51.5m から 44.8m) Single baseline は海洋大基準局 車両 87.3% VRS は日本 GPS データサービス 車両 65.4% どちらも GPS/GLO の RTCM3 24
25 拡大 5m 程度の single-baseline RTK を別の場所で何回か試験 補正データを入力するとすぐに FIX VRS との検証でも系統誤差があるのみで特に問題はない 25
26 市販の PPP サービスはどれほどか? 3 minutes static and 15 minutes inematic Trimble SPS855+RTX PPP) option Comparison with RTK results Omni-star was used Open Sy Horizontal plots at Harumi Area 26
27 Altitude Comparison between RTK and RTX PPP) Red : RTK-GNSS Blue : RTX using GPS/GLONASS Static Kinematic 1 分 The accuracy was maintained within several centi-meters after 15 minutes of power on. Small bias about 1cm) was deduced from other reason. 27
28 Proposed Multipath Mitigation Method Corresponding to Speed Signal qualtiy chec Satellite selection Position and Velocity estimation NVS>=4,HDOP<1 Loosely Coupled Kalman Filtering Input observation data Output solution Parameter setting according to speed v Hx y Gw Fx x 1 T )] ) ) ) ) ) [,a,a,v,v y, x y x y x x T a v v T a v v T a T v y y T a T v x x y y y x x x y y x x ) ) 1) ) ) 1) 2. / ) ) ) 1) 2. / ) ) ) 1) T T T T T T / / F T )] ), ), ) [ v v,y x y x y H noise measurement v vector measurement y system noise w state vector x : : : : observation matrix H distribution matrix noise G state transition matrix F : : : Proposed antenna motion method may not be practical Based on the amount of our test data, * Doppler frequency derived velocity is quite tolerant to strong multipath condition * Pseudo-range based position is not tolerant to strong multipath condition. * We need to put them together efficiently according to speed. * NLOS satellite has to be removed as much as possible. Flowchart Elevation C/N Normal C/N Elevation dependent threshold Loosely coupled KF Speed Weighting Slow or zero Position <<< Velocity Normal Position < Velocity
29 Kinematic Car Test Test route August 215 Tsuishima, Toyo Popular low-cost single frequency GNSS receiver GPS/BEI/QZS DGNSS) 3 times for same route 2 minutes with 5Hz References : POS/LV Normal urban areas except for several high-rise buildings Detailed results are introduced using 3 rd period raw-data normal constellation) GLO/GAL were not used. 1 st 2 nd 3 rd
30 Code Based Positions with or without C/N chec Without C/N chec With C/N chec We need to reduce the large jumps probably due to NLOS satellite as much as possible before coupling. C/N based satellite selection is effective to some degree. Usually, 7-8 db is set as a gap between normal and threshold.
31 Final Loosely Coupled Positions with or without Speed Consideration Without speed consideration With speed consideration The normal weighting for positioning / velocity is 5m /.5m/s. Speed consideration means we heavily rely on velocity when the car speed is very slow or zero.
32 Relationship between Accumulated Percentage and Absolute Horizontal Errors Maximum error % within 1.5 m Speed consideration 1.86 m 99.5 % Non consideration 1.36 m 82.4 % Receiver s NMEA 5.31 m % No correction Results of other 2 tests were almost same tendency.
33 Accumulated Percentage and Absolute Horizontal Errors + low-cost single frequency RTK
34 実験結果の現状 主に車両 ) GNSS 単独での意味 精度収束 Open Semi Urban PPP 1cm 約 15 分 困難困難 RTK 1cm 瞬時 7 9% 5% 1 周波 1-3m 瞬時 精度が落ちる IMU やスピードセンサとの融合が前提 34
35 New Service Creation using RTK TUMSAT-SHINJUKU round trip in Toyo TUMSAT base station was used) Multi-GNSS RTK improved the performance a lot even in the dense urban areas. However, we need to find the suitable applications to contribute society. RTKLIB is quite useful tool for research and education. MODE Rate Single 97.% DGNSS 95.% RTK-GNSS 81.6% Realtime Altitude Determinatio It is easy for students to improve RTK/PPP algorithm using the real-time based source code. 35
36 Low-cost Receiver Instantaneous Static RTK Very short baseline analysis -1m Total period: 24 hours Different mas angles 15 & 3 degrees Open sy condition Data rate: 1Hz Average number of satellites GPS L1 8.3 & 6.1 GPS/QZS L1 and BeiDou B & 12 Mas angle = 15 degrees Combinations Fix rate %) Reliability %) GPS GPS+QZS GPS+BDS GPS/QZS/BDS GPS L1+L2) Mas angle = 3 degrees Combinations Fix rate %) Reliability %) GPS GPS+QZS GPS+BDS GPS/QZS/BDS GPS L1+L2)
37 Low-cost Receiver Car RTK Multipath rich urban environment in a paring lot Total period : ~25 min Mas angles 15 degrees Frequency: 5Hz Reference station on the rooftop of our building at Etchujima GPS/QZS L1 and BeiDou B1 ~12 Instantaneous fix rate around 9.6% despite good availability many wrong fixes) Cycle-slips for most of available satellites 9.6% FIX Many wrong fixes Strong multipath 37
38 Nearly 1 % results using our software RTKLIB is great software but it still has a room to improve. We have developed the post-processed RTK software because some of applications requires nearly 1% availability even in post-processing. The new post-processed RTK software will be available within this year. 38
39 Ellipsoidal Height m) Precise Position for Small Boat Height Determination of Small Boat on the Sea 1hour) GPSTIME s) 39
40 RTK for UAV >Height Single solution RTK solution Precise Position for Drone >Horizontal Single solution RTK solution 4
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