Parallel path planning method and system based on double-layer index

A path planning, two-layer technology, applied in the parallel path planning method and system field based on two-layer index, can solve the problem of high cost of route planning, achieve the effect of reducing planning cost and improving response speed

Pending Publication Date: 2021-10-01
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above work repeatedly calculates the shortest path from the user's mobile location to the destination, which makes route planning more expensive

Method used

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  • Parallel path planning method and system based on double-layer index
  • Parallel path planning method and system based on double-layer index
  • Parallel path planning method and system based on double-layer index

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Embodiment 1

[0066] Such as image 3 As shown, the present invention adopts the "Master-Workers" distributed computing framework, and all subgraphs are in charge of different Workers, and one Worker can be in charge of multiple subgraphs. The skeleton diagram is deployed to the Worker that needs to process the query. The road network is only maintained by the Master. When the passage time of the road changes, the Master will distribute the changed passage time to each Worker in real time, and these Workers will weight the edges of the subgraphs and skeleton graphs they maintain Make adjustments. The specific process is: the Master maintains a road network, divides the subgraph, calculates the top-k frequent routes through the prefix path tree, establishes the skeleton graph, and completes the two-layer index structure. For the path query of the start point and end point entered by the user, the Master sends it to a QueryWorker, and the QueryWorker maintains the skeleton graph and adds th...

Embodiment 2

[0102] Such as figure 2 As shown, the present invention provides a parallel path planning system based on a two-layer index, and the system includes:

[0103] A two-layer index structure building module 101, configured to construct a two-layer index structure; the two-layer index structure includes: a skeleton graph and multiple subgraphs;

[0104] A reference route calculation module 102, configured to calculate a reference route by using the two-layer index structure according to the starting point and end point input by the user;

[0105] The local optimization module 103 is configured to perform local route optimization on all subgraphs passed by the reference route.

[0106] In the embodiment of the present invention, the two-layer index structure building module specifically includes:

[0107] The subgraph division unit is used to traverse the road network using the breadth-first strategy, and divide the road network into N subgraphs, and save the boundary points of e...

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Abstract

The invention discloses a parallel path planning method and system based on a double-layer index. The method comprises the following steps: firstly, constructing a double-layer index structure, wherein the double-layer index structure comprises a skeleton graph and a plurality of sub-graphs; secondly, according to a starting point and an ending point input by a user, calculating a reference route by utilizing the double-layer index structure; and finally, carrying out local route optimization on all the sub-graphs passed by the reference route. According to the method, the planned route is adjusted in time based on a double-layer index structure, the whole adjustment is implemented in a segmented manner in a local route optimization manner, the route planning cost is reduced, and the response speed is also improved.

Description

technical field [0001] The invention relates to the technical field of dynamic path planning, in particular to a parallel path planning method and system based on a double-layer index. Background technique [0002] At present, more and more vehicles rely on navigation routes for travel, hoping to avoid congestion during driving and reach their destination as quickly as possible. In reality, although mainstream navigation software will update the navigation route for driving users according to changes in road conditions, considering the computational cost, the navigation route update frequency of these software is slow, which often causes users to get into congestion. [0003] The spatio-temporal query problem of location-based services (LBS) has attracted widespread attention from scholars at home and abroad. In the navigation route recommendation service, timely adjustment of the navigation route for users who are using navigation based on complex and changing road conditio...

Claims

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Application Information

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IPC IPC(8): G01C21/30G01C21/34
CPCG01C21/30G01C21/343G01C21/3446
Inventor 李博涵戴天伦于自强臧亚磊解文彬黄哲龙田博杨新民
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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