(13) (15) Elastc Band Bubble Band (16) Real-Tme A RTA (17) Laser Range Fnder: LRF Real-Tme A* 5 6 Illustraton of workspace and proposed graph- F
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1 D IEEJ Transactons on Industry Applcatons Vol.131 No.1 pp.1 9 DOI: /eejas Autonomous Varable-Resoluton Map Buldng for Moble Robots n Unknown Envronments Jngyu Xang, Non-member, Yuch Tazak, Non-member, Shnkch Inagak, Non-member, Tatsuya Suzuk, Member Ths paper presents a method that allows smultaneous map buldng and path plannng for moble robots n unknown envronments. A graphcal representaton of a workspace n varable resolutons s constructed usng measurement data obtaned by omndrectonal dstance sensors. At the same tme, a search for a feasble path to the target destnaton s executed usng the constructed graph map. The proposed method s evaluated by performng smulatons and experments usng an omn drectonal moble robot equpped wth laser range fnders. Keywords: Sensor-based Navgaton, Graph Map, Path Plannng, Varable-Resoluton 1. (1) (1) (2) Smultaneous Localzaton and Map Buldng SLAM (3) (5) SLAM Dept. of Mech. Sc. & Eng., Nagoya Unversty Furo-cho, Chkusa-ku, Nagoya, (6) (8) (9) (12) c 2011 The Insttute of Electrcal Engneers of Japan. 1
2 (13) (15) Elastc Band Bubble Band (16) Real-Tme A RTA (17) Laser Range Fnder: LRF Real-Tme A* 5 6 Illustraton of workspace and proposed graph- Fg. 2. map Laser range fnder 2 Fg. 1. (L W H)=( ) Omn-drectonal camera Personal computer DC motor 3 Omn-wheel 3 Moble robot for experment 2. Fg. 1 DC 500mm/s LRF Fg. 2 LRF C-space C-space 2 IEEJ Trans. IA, Vol.131, No.1, 2011
3 Table 1. Defntons of terms and symbols C-space (x, y) p (n) : C-space n G C-space n p S : n S : p S p G : n G : p G (x, y) θ C-space C-space C-space Confguraton Obstacle C-space C-space 2 C-space (x, y) 2 C-space Fg. 2 C-space Table 1 Fg. 2 C-space C-space (x, y) n p (n) (18) (19) n G n G Fg. 3 Intate searchng at Start node Clear heurstc cost Has current node been arrved at before? Yes Chap.4 No Sensng Sec.3.1 Cell generaton Sec.3.2 Node generaton Lnk generaton Goal n cell? RTA* search No A: Decde next node B: Update heurstc cost C: Move to next node Fg. 3. Yes Move to Goal End Flowchart of overall procedure RTA (17) RTA 4 RTA n S p G n G n G p G 4 n G Fg. 4 R max C-space 3 IEEJ Trans. IA, Vol.131, No.1, 2011
4 Confguraton obstacle Blnd spot Cell of node n Cell boundary Node n Algorthm: Cell generaton STEP1 R (n) 0 R (n) 0 R max R (n) 0 := R max. (5) Moble robot Fg. 4. Measured dstance D (n) (θ) and cell radus R (n) R (n) n θ R 1 (0 θ < 2π) D (n) (θ) C-space n θ D (n) (θ) := R max Fg. 4 n C (n) C (n) = { p p p (n) mn ( D (n)( arg(p p (n) ) ), R (n))}. (1) arg( ) p (n) R (n) R (n) ˆR (n) = max r R (n) = max ( R mn, mn(r max, ˆR (n) ) ), (2) s.t. 1 2π 2π 0 max ( r D (n) (θ), 0 ) dθ R th. (3) ˆR (n) R th θ (3) max ( r D (n) (θ), 0 ) (3) ˆR (n) (2) R (n) R mn R th R th = 0 ˆR (n) R mn R th 3 3 R th (3) ˆR (n) (3) (3) 1 m 1 max ( ˆR (n) D (n) (k θ), 0 ) R th. (4) m k=0 m θ θ [ ] m m = [2π/ θ] (4) (2) R (n) STEP1 3 STEP2 STEP4 STEP3 1 m 1 max(r (n) D (n) (k θ), 0) R th, (6) m k=0 R (n) R mn. (7) STEP3 + 1 R (n) STEP2 R (n) STEP4 = 1 m k=0 m 1 mn ( D (n) (k θ), R (n) 1). (8) R (n) = max(r (n), R mn ). (9) mn ( D (n) (0), D (n) ( θ),..., D (n)( (m 1) θ ) ) R (n) R (n) 1 (10) R (n) R (n) (6) R (n) R th (7) R (n) R mn R (n) n Fg. 4 R (n) A 1 3 (Fg. 5) Rule: Node generaton A 1 A 2 A 3 A 2 θ f (θ) = mn(d (n) (θ), R (n) ) f (θ) A 3 4 IEEJ Trans. IA, Vol.131, No.1, 2011
5 Rule A-1: Node generaton pont Cell Confguraton obstacle Wdth at entrance of narrowest path Goal Current node Rule A-2: Node generaton ponts Confguraton obstacle Rule A-3: Node generaton prohbted regon Current node Current node Exstng node (a) bad case (b) Good case Fg. 7. Decson ndcator of R mn and R th Fg. 5. Node generaton rules Current node Exstng node (a) A node s nsde the cell of another node. (a) Search phase (b) Update and move Fg. 8. Image of path plannng usng RTA Fg. 6. (b) Two cells overlap, no obstacle n-between. (c) Obstacles exst between two nodes. Lnk generaton rule B (Fg. 6) Rule: Lnk generaton B Fg. 6(a),(b) c C-space Confguraton obstacle C-space 3 3 R mn R th Fg. 7 d r Fg. 7 C-space (3) ˆR (n) = 2R th. (11) R (n) (2) R (n) = max ( R mn, 2R th ). (12) R (n) < d r R mn < d r, (13) 2R th < d r. (14) R mn R th IEEJ Trans. IA, Vol.131, No.1, 2011
6 A (20) (17) (21) (24) RTA (17) RTA RTA L n n l(n, n ) N (n) k (k 0) N (n) 0 := n, N (n) k k 1 = {n l(ˆn, n ) L, ˆn N (n) k 1, n =0 N (n) }. (15) n k Algorthm: RTA* search n c d g(n, n ) h (n) f (n, n ) n n n n n STEP1 h (n) n S n c STEP2 n( N (n c) 1 ) f (n c, n) f (n c, n) n (Fg. 8(a)) f (n c, n) = g(n c, n) + h (n), n = arg mn n N (nc) 1 f (n c, n). (16) h (n) n h (n) = { mn g(n, nd+1 ) + h } (n d+1). (17) n d+1 N (nc) d+1 h (n d+1) n d+1 h (n d+1) = n d+1 p G 2 n d n d d (17) d = 0 h (n) = n p G 2 n d n G h (n) = g(n, n G ) STEP3h (n c) (Fg. 8(b)) h (n c) = mn f (n c, n). (18) n N (nc) 1 \{n } STEP4 n c n n n c STEP2 4 Fg. 3 RTA search A,B C STEP3 R mn RTA Table 2,3 15 RTA Table 2 d r R mn R th RTA d N (n c) 1 d d = 0 θ mm Table 2 R mn Fg. 9 p S p G R mn R th 100 Fg. 9 0 < R th < R mn /2 R mn 6 IEEJ Trans. IA, Vol.131, No.1, 2011
7 Table 2. Condton settngs for R mn wth 0 < R th < d r /2 Case Parameter settng Success rate Average of dfference to Case < R mn < d r /2 100% +3.1 (steps) 1-2 d r /2 R mn < d r 100% 1-3 R mn = d r 87% 0.9 (steps) 1-4 d r < R mn < 3d r /2 76% 2.1 (steps) 1-5 3d r /2 R mn 2d r 70% 4.3 (steps) Table 3. Condton settngs for R th wth d r /2 R mn < d r Case Parameter settng Success rate < R th < d r /2 100% 2-2 d r /2 R th < d r 92% 2-3 d r R th < 3d r /2 71% p G p G d r Fg. 10. Graph-map constructed by smulaton n large envronment p S (a)case 1-1 Fg. 9. p S (b)case 1-3 Result of smulaton p G 0 < R mn < d r. (19) (13) p G p S p G p G Case 1-2 (19) R mn Case 1-1 Fg. 9(a) Fg. 9(a) p S p G R mn Case 1-3 R mn = d r p G Fg. 9(b) Table 3 R th Fg. 9 p S p G R mn R th st. Start 2400 Fg. 11. Landmark Obstacle 1 1 st. tral nd.goal Obstacle 2 Obstacle 3 Landmark Envronment for experment 2 nd. tral 1 st.goal 2 nd.start (mm) d r /2 R mn < d r R th p G 0 < R th < d r /2. (20) (14) Case 2-2, 3 R (n) R mn Fg. 9(a) 20m 20m Fg. 10 Fg RTA 5 2 (Fg. 1) 7 IEEJ Trans. IA, Vol.131, No.1, 2011
8 Start Start (a) Frst tral Goal (b) Second tral (c) Thrd tral Goal Start Goal Fg. 12. Graph-map constructed by the moble robot (a,b) and path of the moble robot usng path-plannng on the graph-map wth the search depth set as 5 (c) 500mm/s 2 500mm/s RTA d = 0 d 1 LRF θ 0.36 R max LRF 4000mm R mn (19) 300mm R th (20) 40mm Fg. 11 C-space LRF C-space Fg. 12 Fg. 12(a) C-space Obstacle3 R (n) R (n) Obstacle1,3 A 2 B RTA Obstacle2,3 R (n) R mn RTA Fg. 12(b) Fg. 12(b) d = 5 Fg. 12(c) 6. 8 IEEJ Trans. IA, Vol.131, No.1, 2011
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