Journal of Jilin University(Engineering and Technology Edition) ›› 2019, Vol. 49 ›› Issue (3): 963-971.doi: 10.13229/j.cnki.jdxbgxb20171135

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Optimal algorithm of searching route for large amphibious aircraft

Yi YANG1(),Si⁃cai WANG2,Ying NAN1()   

  1. 1. College of Astronautics, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
    2. China Aviation Industry General Aircraft Co. , Ltd. , Zhuhai 519000, China
  • Received:2017-11-22 Online:2019-05-01 Published:2019-07-12
  • Contact: Ying NAN E-mail:nuaa_yang@nuaa.edu.cn;nanying@nuaa.edu.cn

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Abstract:

To enhance the search and rescue capacity, this paper represents an optimal algorithm of searching route for large amphibious aircraft to complete its search tasks within minimum time based on the flight characteristics of aircraft. The search route planning problem is transformed into a discrete programming problem considering the indexes of both missing search rate and duplicate search rate. The optimal route planning algorithm applied the route backdate indexes to satisfy the duplicate search rate. Meanwhile, the planned routes satisfy all constraints, such as the maximum overload, no?flying zone and so on. The numerical simulation results indicate that the performance indexes of the optimal routes calculated by the optimal route planning algorithm are better than the ones obtained by the traditional search route planning methods.

Key words: navigation guidance and control, navigation technology, route planning, improved dynamic programming, high?seas search and rescue, large amphibious aircraft

CLC Number: 

  • V249

Fig.1

Search zone while aircraft fly pass grids"

Fig.2

Schematic diagram of mesh connected domain"

Fig.3

Schematic diagram of no?flying zone"

Fig.4

Schematic diagram of search zone of aircraft"

Fig.5

Missing search zone and duplicate search zone of aircraft with turning flight in no?flying zone"

Fig.6

Schematic diagram of duplicate search zoneof aircraft in no?flying zone"

Fig.7

Schematic diagram of grid selection of route planning algorithm"

Fig.8

Comparison between routes calculated by traditional and improved dynamic programming"

Fig.9

Optimal planned search route on sea"

Fig.10

Search route on sea"

Table 1

Parameters of different route planning methods"

参数 方形航路 梯形航路 最优航路
飞行时间/s 30871.5 31324.5 30264.6
航路总长/106 m 3.5491 3.7015 3.475
漏搜率/% 0.36 0.38 0.42
复搜率/% 6.73 5.48 5.54
综合性能指标 1.8599 1.9246 1.8139

Fig.11

Tracking trajectory of optimal route"

Fig.12

Tracking guidance command acceleration"

Fig.13

Control rudder deflection angle"

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