CN114020042A - Heterogeneous unmanned cluster formation enclosure tracking control method and system - Google Patents
Heterogeneous unmanned cluster formation enclosure tracking control method and system Download PDFInfo
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Abstract
The invention relates to a heterogeneous unmanned cluster formation enclosure tracking control method and system. According to the method, a motion model of a tracking-leader is determined according to the macro motion state and bounded control input of a heterogeneous unmanned cluster system; constructing a distributed time-varying formation tracking controller according to the motion model of the tracking-leader, the state of the formation-leader, the communication topological relation and the time-varying output formation vector; constructing a distributed surround-tracking controller according to the state of the formation-leader and the state of the follower; constructing a formation-leader motion model according to the distributed time-varying formation tracking controller and the motion model of the tracking-leader; constructing a follower motion model according to the formation-leader motion model and the distributed surround-tracking controller; the invention realizes formation-enclosure tracking control of a heterogeneous unmanned cluster system with switching communication topology and unknown input of a leader.
Description
Technical Field
The invention relates to the field of cluster system cooperative control, in particular to a heterogeneous unmanned cluster formation surround tracking control method and system.
Background
The unmanned cluster cooperative control is widely concerned and emphasized at home and abroad in recent years, the task execution efficiency can be remarkably improved through cooperative complementation between heterogeneous unmanned platforms, and the unmanned cluster cooperative control has a wide application prospect in a plurality of task applications such as large-scale cooperative area search, cluster optimization scheduling and the like. In recent years, a large number of application tests are carried out in the aerospace field, such as unmanned plane swarm attack, multi-missile cooperative defense, multi-satellite cooperative detection and the like. However, the task type, the coordination mode and the coordination strategy of the existing unmanned cluster system are relatively simple, and an autonomous coordination control technology under a complex environment condition needs to be researched urgently.
Currently, the field of cluster system cooperative control has generated a plurality of closely related and focused research branches, including consistency control, formation control, enclosure control, and the like. In traditional closed control studies, it is generally assumed that there is no interaction or collaboration between multiple leaders. However, in practical application scenarios, the leader often needs to collaborate to maintain a specific time-varying formation and be able to track a reference track or a specific target to move in order to better meet the task requirements. For example, when a high-low-matching multi-missile system is cooperatively attacked, highly configured missiles are required to form a desired relative position relationship through cooperation, and meanwhile, the lowly configured missiles need to be capable of accurately falling into an attack area under the guidance of the highly configured missiles. In the scene, a more complex formation-enclosure tracking control problem occurs, different cooperative control targets in layers and cooperative coupling among layers exist in a cluster system, on one hand, multiple leaders are required to form a specific formation and track a reference track or target motion, and on the other hand, followers are required to enter the formation formed by the leaders. Therefore, the research on formation-enclosure tracking control of the unmanned cluster system not only has theoretical significance, but also has more practical engineering significance.
Existing cooperative control methods generally assume that the cluster system is homogeneous, i.e., all individuals in the cluster are required to have the same kinetic and kinematic models. However, the isomorphic cluster has the limitations of single intelligent emerging mode, weak cooperative capability and the like. The advantages of different unmanned systems such as unmanned aerial vehicles, unmanned vehicles and unmanned boats can be fully exerted by the cross-domain cooperation of heterogeneous clusters, and the multiplication of cluster intelligence is realized in a structural coupling and function complementation mode. However, at present, the research on formation control and enclosure control of the heterogeneous cluster system is still in a starting stage, and related research results are few. Meanwhile, under the influence of switching topology, the existing method is difficult to make the control error of the closed-loop system converge, so that the unmanned cluster system formation-enclosure control technology directly applied to switching topology needs to be broken through.
Disclosure of Invention
The invention aims to provide a heterogeneous unmanned cluster formation and enclosure tracking control method and system, which are used for realizing formation-enclosure tracking control of a heterogeneous unmanned cluster system with switching communication topology and unknown leader input.
In order to achieve the purpose, the invention provides the following scheme:
a heterogeneous unmanned cluster formation surround tracking control method comprises the following steps:
determining a tracking-leader, a formation-leader, and a follower from the heterogeneous unmanned cluster system; the tracking-leader generates a target signal tracked by the entire heterogeneous unmanned cluster system; the formation-leader and the follower are different types of agents in the heterogeneous unmanned cluster system respectively;
determining a motion model of a tracking-leader according to the macro motion state of the heterogeneous unmanned cluster system and bounded control input; the motion model of the tracking-leader is used for generating a reference track of the overall motion of the heterogeneous unmanned cluster system;
acquiring a communication topological relation of a heterogeneous unmanned cluster system; the union of the neighbor sets of all followers in the communication topological relation of the heterogeneous unmanned cluster system comprises all formation-leaders, and the action topologies of the followers are communicated; the action topology among the leaders is a spanning tree with a tracking-leader as a root node, and the action topology among the formation-leaders is undirected;
constructing a distributed time-varying formation tracking controller according to the motion model of the tracking-leader, the state of the formation-leader, the communication topological relation and the time-varying output formation vector; constructing a distributed surround-tracking controller according to the state of the formation-leader and the state of the follower;
constructing a formation-leader motion model according to the distributed time-varying formation tracking controller and the motion model of the tracking-leader; constructing a follower motion model according to the formation-leader motion model and the distributed surround-tracking controller;
tracking a reference trajectory of the tracking-leader using a formation-leader motion model time-varying formation;
the follower's output is converged into the convex hull of the formation-leader formation using a follower motion model.
Optionally, determining a motion model of the tracking-leader according to a macro motion state of the heterogeneous unmanned cluster system and a bounded control input, specifically including:
wherein,the status of the track-leader is represented,a control input representing a track-leader,the output of the track-leader is represented,is a matrix of constants, v0(t) is bounded, and r0(t)||∞Eta is less than or equal to eta, and eta is a constant.
Optionally, the constructing a distributed time-varying formation tracking controller according to the motion model of the tracking-leader, the state of the formation-leader, the communication topological relation, and the time-varying output formation vector specifically includes:
using the formula hyi(t)=Yihi(t) determining a time-varying output queuing vector;
wherein,denotes a formation parameter, i is 1,2, …, N denotes the number of formation-leaders,representing the formation output matrix, hyi(t) is a time-varying output queuing vector,representing the state of the formation-leader,represents a pair v0Is determined by the distributed estimation of the time domain,represents the adaptive control gain; tau isiRepresenting a time-varying convoy tracking compensation input,μ denotes the normal number, K1i、Khi、K2i、ΥiAnd ΓiA matrix of gains is represented by a matrix of gains,a non-negative weight is represented by a non-negative weight,representing neighbor formation-leader j pairs v0Is calculated.
Optionally, the constructing a distributed time-varying formation tracking controller according to the motion model of the tracking-leader, the state of the formation-leader, the communication topology relationship, and the time-varying output formation vector further includes:
judging whether the time-varying output formation vector has compensation input or not;
If so, constructing a distributed time-varying formation tracking controller; if not, re-determining the time-varying output formation vector;
wherein,representing a constant matrix, τi(t) represents the compensation input and,a matrix of constants is represented by a matrix of constants,denotes an external input, XhiRepresenting a constant matrix that satisfies the local regulator equation.
Optionally, said constructing a formation-leader motion model from a distributed time-varying formation tracking controller and a motion model of a tracking-leader; constructing a follower motion model according to a formation-leader motion model and a distributed surround-tracking controller, and specifically comprising the following steps of:
wherein,andrespectively, the status, control inputs and outputs of the formation-leader i or follower i, i being 1,2, …, N + M, M being the number of followers, is a matrix of constants.
Optionally, said constructing a formation-leader motion model from a distributed time-varying formation tracking controller and a motion model of a tracking-leader; constructing a follower motion model according to the formation-leader motion model and the distributed surround-tracking controller, and specifically further comprising:
using formulasDetermining that a formation-leader achieves a desired time-varying output formation tracking condition;
using formulasDetermining that the formation-leader and follower achieve a desired output bounding condition;
wherein, yi(t) is the output of the formation-leader i, i ═ 1,2, …, N, yk(t) output of follower k, ρk,jA non-negative constant of the number of the first,k∈{N+1,N+2,…,N+M},j=1,2,…,N。
a heterogeneous unmanned cluster formation surround-track control system comprises:
the intelligent agent dividing module is used for determining a tracking-leader, a formation-leader and a follower according to the heterogeneous unmanned cluster system; the tracking-leader generates a target signal tracked by the entire heterogeneous unmanned cluster system; the formation-leader and the follower are different types of agents in the heterogeneous unmanned cluster system respectively;
the motion model determination module of the tracking-leader is used for determining the motion model of the tracking-leader according to the macro motion state of the heterogeneous unmanned cluster system and bounded control input; the motion model of the tracking-leader is used for generating a reference track of the overall motion of the heterogeneous unmanned cluster system;
the communication topological relation acquisition module is used for acquiring the communication topological relation of the heterogeneous unmanned cluster system; the union of the neighbor sets of all followers in the communication topological relation of the heterogeneous unmanned cluster system comprises all formation-leaders, and the action topologies of the followers are communicated; the action topology among the leaders is a spanning tree with a tracking-leader as a root node, and the action topology among the formation-leaders is undirected;
the controller construction module is used for constructing a distributed time-varying formation tracking controller according to the motion model of the tracking-leader, the state of the formation-leader, the communication topological relation and the time-varying output formation vector; constructing a distributed surround-tracking controller according to the state of the formation-leader and the state of the follower;
the motion model building module is used for building a formation-leader motion model according to the distributed time-varying formation tracking controller and the motion model of the tracking-leader; constructing a follower motion model according to the formation-leader motion model and the distributed surround-tracking controller;
a time-varying formation tracking module for tracking a reference trajectory of the tracking-leader by a time-varying formation using a formation-leader motion model;
and the enclosure control module is used for converging the output of the follower to a convex hull of the formation formed by the formation-leader by utilizing the follower motion model.
Optionally, the motion model construction module of the tracking-leader specifically includes:
a tracking-leader motion model determination unit for utilizing a formulaDetermining a motion model of the tracking-leader;
wherein,the status of the track-leader is represented,a control input representing a track-leader,the output of the track-leader is represented,is a matrix of constants, v0(t) is bounded, and r0(t)||∞Eta is less than or equal to eta, and eta is a constant.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention provides a heterogeneous unmanned cluster formation encircling tracking control method and system, which are characterized in that each agent is divided into three types of tracking-leader, formation-leader and follower, the tracking-leader with time-varying input is adopted to generate an integral reference track of a cluster system or represent a non-cooperative target to be tracked, edge-based distributed observers are respectively designed for the formation-leader and the follower based on an adaptive control and sliding mode variable structure control theory, and finally a predefined encircling control strategy is utilized to ensure that the convergence target value of the follower does not depend on communication topology, thereby realizing formation-encircling tracking control of the heterogeneous unmanned cluster system with switching communication topology and unknown input of the leader.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
Fig. 1 is a schematic flow chart of a heterogeneous unmanned cluster formation surround tracking control method provided by the present invention;
FIG. 2 is a possible action topology;
fig. 3 is a screenshot of the position trajectory of the drone-drone vehicle system at t-30 s and at a given time t-0, 15,25,30 s;
FIG. 4 is a queue-leader output queue tracking error curve;
FIG. 5 is a follower output encircled error curve;
fig. 6 is a schematic structural diagram of a heterogeneous unmanned cluster formation surround tracking control system provided by the present invention.
The numbers in the figures illustrate the following:
five-pointed star: tracking-leader drone i ═ 0; rhombus, upper triangle, circle and right triangle: formation-leader drone i ═ 1,2,. 4; square: a follower unmanned vehicle i ═ 5, 6.. 10;
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a heterogeneous unmanned cluster formation and enclosure tracking control method and system, which are used for realizing formation-enclosure tracking control of a heterogeneous unmanned cluster system with switching communication topology and unknown leader input.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Fig. 1 is a schematic flow chart of a heterogeneous unmanned cluster formation encircling tracking control method provided by the present invention, and as shown in fig. 1, the heterogeneous unmanned cluster formation encircling tracking control method provided by the present invention includes:
s101, determining a tracking-leader, a formation-leader and a follower according to a heterogeneous unmanned cluster system; the tracking-leader generates a target signal tracked by the entire heterogeneous unmanned cluster system; the formation-leader and the follower are different types of agents in the heterogeneous unmanned cluster system respectively; tracking-the leader has no neighbors, the formation-leader's neighbors only include the leader, and the followers' neighbors are formation-leaders or other followers. Consider a higher-order heterogeneous unmanned cluster system consisting of N + M +1 agents, where i-0 represents a trail-leader, i-1, 2, …, N represents a formation-leader, i-N +1, N +2, …, and N + M represents a follower.
S102, determining a motion model of a tracking-leader according to the macro motion state and bounded control input of the heterogeneous unmanned cluster system; the motion model of the tracking-leader is used for generating a reference track of the overall motion of the heterogeneous unmanned cluster system;
s102 specifically comprises the following steps:
wherein,the status of the track-leader is represented,a control input representing a track-leader,the output of the track-leader is represented,is a matrix of constants, v0(t) is bounded, and r0(t)||∞Eta is less than or equal to eta, and eta is a constant.
S103, acquiring a communication topological relation of the heterogeneous unmanned cluster system; the union of the neighbor sets of all followers in the communication topological relation of the heterogeneous unmanned cluster system comprises all formation-leaders, and the action topologies of the followers are communicated; the action topology among the leaders is a spanning tree with a tracking-leader as a root node, and the action topology among the formation-leaders is undirected;
s103 specifically comprises the following steps:
communication topology availability map for heterogeneous unmanned clustersIt is shown that,a set of nodes is represented that is,a set of edges is represented that is,representing having non-negative weight wijOf the adjacent matrix. Let epsilonij=(vi,vj) Representation diagramIn the slave node viTo node vjOne edge of (2). Weight wijIf > 0 and only if εjiE epsilon, otherwise w ij0. By usingRepresenting a node viIs selected. Drawing(s)Is defined asWherein,(i-1, 2, …, N) represents node viThe degree of entry of (c). Definition mapIs the Laplace matrix of
Considering the scenario that the cluster system has switching topology, subscripts of all possible action topologies are set asLet [ t)l,tl+1) (l-0, 1,2 …) represents an infinite sequence of consistent bounded non-overlapping time intervals, where t isl+1-tl≥τdIs greater than 0. Action topology at time tl+1A handover occurs. Let σ (t) [ [0, ∞) → {1,2, …, z } denote a switching signal, which takes the value of the number in the current diagram. At time t, the action graph and the corresponding Laplace matrix are respectively recorded asAndto ensure that each formation-leader can function in the enclosure control, the union of each follower neighbor set is required to contain all the formation-leaders. Assuming topology for any possible actionsRole topology between leadersThe method comprises the steps that a spanning tree with a tracking-leader as a root node is provided, and the acting topology between formation and leader is undirected; action topology between followersAre connected. Will correspond to the figureAndthe Laplace matrices are respectively denoted asAndcan be divided intoAt this time, it can be knownIs a positive definite matrix.
S104, according to the motion model of the tracking leader, the state of the formation leader, the communication topological relation and the time-varying output formation directionMeasuring, constructing a distributed time-varying formation tracking controller; constructing a distributed surround-tracking controller according to the state of the formation-leader and the state of the follower; that is, for the formation-leader (i ═ 1,2, …, N), a time-varying vector is usedCharacterize its expected time-varying output formation, wherein hyi(t) (i ═ 1,2, …, N) is piecewise continuously conductible
For a formation-leader i (i ═ 1,2,. N), the desired time-varying output formation vector hyi(t) is generated by the following off-site system:
in the formula:a parameter indicative of the formation parameter is,which represents an external input, is presented,a matrix of the formation status is represented,a matrix of constants is represented by a matrix of constants,represents a time-varying output queuing vector,representing a formation output matrix. By bounded external input ri(t) to produce a more general type of time-varying formation, h is requiredi(t) is bounded.
wherein,denotes a formation parameter, i is 1,2, …, N denotes the number of formation-leaders,representing the formation output matrix, hyi(t) is a time-varying output queuing vector,representing the state of the formation-leader,represents a pair v0Is determined by the distributed estimation of the time domain,represents the adaptive control gain; tau isiRepresenting a time-varying convoy tracking compensation input,μ denotes the normal number, K1i、Khi、K2i、ΥiAnd ΓiA matrix of gains is represented by a matrix of gains,a non-negative weight is represented by a non-negative weight,representing neighbor formation-leader j pairs v0Is calculated.
wherein, representing the ith follower pair xj(j ∈ {1,2, …, N }) of distributed estimates,(j ∈ {1,2, …, N }) and(k ∈ { N +1, N +2, …, N + M }) represents an adaptive gain;satisfy the requirement ofNon-negative constant ρ ofi,jRepresenting predefined weight values for determining a desired convex combination of multi-formation-leader outputs, K representing a normal number, K3i、Υi,jAnd Qi,jA gain matrix is represented.
S104 specifically further includes:
judging whether the time-varying output formation vector has compensation input or not;
If so, constructing a distributed time-varying formation tracking controller; if not, re-determining the time-varying output formation vector;
that is, if satisfied, adaptive parameters in a distributed time-varying convoy tracking controllerThe update law of (j ∈ {0,1, …, N }) is:
in the formula: initial valueAnd is provided withk is 1,2, …, N. Selecting mu with sufficient size to make mu larger than or equal to eta. Designing a gain matrix K1iSo that A isi+BiK1iIs Hurwitz, order Khi=Uhi-K1iXhi,K2i=Ui-K1iXiSelection upsiloniSo that BiΥi-XiE is 0. Let F bei=ΦiBiΥi,ΦiFor positive definite matrices, the following Lyapunov equation is satisfied: phii(Ai+BiK1i)+(Ai+BiK1i)TΦi=-Ini;
The gain in the distributed surround-tracking controller for the follower i (i ═ N +1, …, N + M) is then adaptively designed. Adaptive parameters(j ∈ {1,2, …, N }) andthe update law of (k ∈ { N +1, …, N + M }) is as follows:
in the formula: initial value of adaptive parameterIs selected fullyLarge normality number κ satisfiesWherein, thetaj(j ∈ {1,2, …, N }) represents the upper bound of the formation-leader j control input, i.e., | | | uj||∞≤θj. Similarly, the gain matrix K is designed3iSo that A isi+BiK3iIs Hurwitz, order(j e {1,2, …, N }), selecting yi,j(j ∈ {1,2, …, N }) such that B isiΥi,j-Xi,jBjAnd 0 holds. Let Qi,j=PiBiΥi,j,PiRepresents a positive definite matrix satisfying the following Lyapunov equation:
wherein,representing a constant matrix, τi(t) represents the compensation input and,a matrix of constants is represented by a matrix of constants,denotes an external input, XhiRepresenting a constant matrix that satisfies the local regulator equation.
S105, constructing a formation-leader motion model according to the distributed time-varying formation tracking controller and the motion model of the tracking-leader; constructing a follower motion model according to the formation-leader motion model and the distributed surround-tracking controller;
s105 specifically comprises the following steps:
wherein,andrespectively, the status, control inputs and outputs of the formation-leader i or follower i, i being 1,2, …, N + M, M being the number of followers, is a matrix of constants.
Wherein a constant matrix (X) is selectedi,Ui) (i ═ 1,2, …, N), such that the regulator equationIf true;
selecting a constant matrix (X)hi,Uhi) (i ═ 1,2, …, N), such that the regulator equationThis is true.
Selecting a constant matrix (X)i,j,Ui,j) (i N +1, …, N + M, j 1,2, …, N) such that the regulator equationThis is true.
S105 specifically further includes:
using formulasDetermining that a formation-leader achieves a desired time-varying output formation tracking condition;
using formulasDetermining that the formation-leader and follower achieve a desired output bounding condition;
wherein, yi(t) is the output of the formation-leader i, i ═ 1,2, …, N, yk(t) output of follower k, ρk,jA non-negative constant of the number of the first,k∈{N+1,N+2,…,N+M},j=1,2,…,N。
if the time-varying output formation tracking and output enclosure control conditions are simultaneously met for any formation leader i (i belongs to {1,2, …, N }) and follower k (k belongs to { N +1, N +2, …, N + M }), the high-order heterogeneous cluster system is called to realize the expected output formation-enclosure tracking.
S106, tracking the reference track of the tracking-leader by utilizing a time-varying formation of a formation-leader motion model;
and S107, converging the output of the follower into a convex hull of the formation formed by the formation-leader by utilizing a follower motion model.
The formation-enclosure tracking control method is applied to an air-ground cooperative patrol application scene of a multi-unmanned aerial vehicle-unmanned vehicle heterogeneous system, a heterogeneous unmanned cluster system consisting of 4 unmanned aerial vehicles and 6 unmanned vehicles is considered, a tracking-leader i is 0 and represents an overall reference track of the heterogeneous multi-robot system, a formation-leader i is 1,2,3 and 4 represents a four-rotor unmanned aerial vehicle, and followers i are 5,6, … and 10 represent Mecanum wheel unmanned vehicles. The multiple unmanned aerial vehicles form expected formation tracking in the air, meanwhile, the multiple unmanned vehicles can converge into the projection of a convex hull formed by the multiple unmanned aerial vehicles on the ground, and the multi-robot system executes a cooperative patrol task in a formation-enclosure tracking mode. Since the height direction of a quad-rotor drone can be controlled individually, only the motion in the two-dimensional plane (X-Y plane) is considered in the following. Assuming that there is a switch in the active topology of the multi-robot system, all possible topologies are as shown in FIG. 2, with the active topology beingAndis switched once every 5s and has an initial active topology of
r0(t)=[0.1cos(0.1t),0.1sin(0.1t)]T。
Based on the inner and outer ring control architecture, the kinematics model of the quad-rotor drone in the outer loop (position-velocity loop) can be approximated, where(i is 1,2,3,4), eachUsing feedback linearization techniques, the kinematics model of a Mecanum wheel drone vehicle may also be approximated by (2), where Ai=02×2,Bi=I2,Ci=I2(i ═ 5,6, …, 10). The state variable of each unmanned aerial vehicle consists of position and speed, and the output is position; the status and output of each unmanned vehicle is indicative of position.
Four unmanned aerial vehicles are used as formation-leaders to carry out fixed-height flight at a specified height, namely, the unmanned aerial vehicles are controlled independently in the Z-axis direction. The drones are required to form a square formation in the X-Y plane, the expected output formation vector being represented asWherein h isy1=[-1,1]T,hy2=[1,1]T,hy3=[1,-1]T,hy4=[-1,-1]T. To generate hyThe matrix in the readily known local system can be selected as Hi=02×2,Ri=02×2,Yi=I2(i ═ 1,2,3, 4). Six unmanned vehicles need to converge into the projection of a convex hull formed by multiple unmanned vehicles on the ground, and weight vectors rho are defined for depicting expected convergence values of the unmanned vehiclesi=[ρi,1,ρi,2,ρi,3,ρi,4](i ═ 5,6, …,10), and is selected
The formation-enclosure tracking controller is designed. Firstly, respectively selecting X1=X2=I4,X3=X4=I4, (i-5, 6, …,10, j-1, 2,3,4), it can be verified that the regulator equation holds. Then, the controller of the formation-leader drone i (i ═ 1,2,3,4) is designed. Due to Ri=02×2Let the compensation input τi=02×1It can be seen that the feasibility condition (11) holds for each convoy-leader. Selecting adaptive parametersHas an initial value of(i-1, 2,3,4, j-0, 1, …, 4). Let u be 1, the sum of the values of,
finally, the controller of the follower unmanned vehicle i (i ═ 5,6, …,10) was designed. Let adaptive parametersAndhas an initial value ofSelecting K3i=-I2And upsiloni,j=02×2(j ═ 1,2,3, 4). Tracking-leader initial State v0(0)=[-20,0,0,-1]TThe initial state of the formation-leader and follower is generated by a random number.
The simulation results are shown in fig. 3-5. Fig. 3 shows the location trajectory of the drone-drone heterogeneous cluster system within t-30 s and location screenshots at different times (t-0, 15,25,30s), where the five-pointed star indicates that the tracking-leader i-0; the rhombus, the upper triangle, the circle and the right triangle respectively represent formation-leader unmanned aerial vehicles i ═ 1,2,3 and 4; the squares represent follower unmanned vehicles i-5, 6, …, 10. Fig. 4 and 5 show output formation tracking error of the formation-leader and output encircling error curve of the follower, respectively. As can be seen from fig. 3-5, four drones form a desired square formation, and can track the tracking-leader motion trajectory, while six follower drones can converge into the projection of the convex hull formed by multiple drones on the ground. Therefore, the multi-UAV heterogeneous cluster system realizes the expected output formation-surrounding tracking.
Fig. 6 is a schematic structural diagram of a heterogeneous unmanned cluster formation encircling tracking control system provided by the present invention, and as shown in fig. 6, the heterogeneous unmanned cluster formation encircling tracking control system provided by the present invention is characterized by comprising:
the agent partitioning module 601 is used for determining a tracking-leader, a formation-leader and a follower according to the heterogeneous unmanned cluster system; the tracking-leader generates a target signal tracked by the entire heterogeneous unmanned cluster system; the formation-leader and the follower are different types of agents in the heterogeneous unmanned cluster system respectively;
a tracking-leader motion model determination module 602, configured to determine a tracking-leader motion model based on the state of macro motion of the heterogeneous unmanned cluster system and bounded control input; the motion model of the tracking-leader is used for generating a reference track of the overall motion of the heterogeneous unmanned cluster system;
a communication topological relation obtaining module 603, configured to obtain a communication topological relation of the heterogeneous unmanned cluster system; the union of the neighbor sets of all followers in the communication topological relation of the heterogeneous unmanned cluster system comprises all formation-leaders, and the action topologies of the followers are communicated; the action topology among the leaders is a spanning tree with a tracking-leader as a root node, and the action topology among the formation-leaders is undirected;
a controller construction module 604, configured to construct a distributed time-varying formation tracking controller according to the motion model of the tracking-leader, the state of the formation-leader, the communication topology relationship, and the time-varying output formation vector; constructing a distributed surround-tracking controller according to the state of the formation-leader and the state of the follower;
a motion model construction module 605 for constructing a formation-leader motion model according to the distributed time-varying formation tracking controller and the motion model of the tracking-leader; constructing a follower motion model according to the formation-leader motion model and the distributed surround-tracking controller;
a time-varying formation tracking module 606 for time-varying formation tracking the reference trajectory of the tracking-leader using a formation-leader motion model;
a bounding control module 607 for converging the output of the follower into the convex hull of the formation formed by the formation-leader using a follower motion model.
The motion model building module 602 specifically includes:
a tracking-leader motion model determination unit for utilizing a formulaDetermining a motion model of the tracking-leader;
wherein,the status of the track-leader is represented,a control input representing a track-leader,the output of the track-leader is represented,is a matrix of constants, v0(t) is bounded, and r0(t)||∞Eta is less than or equal to eta, and eta is a constant.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (8)
1. A heterogeneous unmanned cluster formation surround tracking control method is characterized by comprising the following steps:
determining a tracking-leader, a formation-leader, and a follower from the heterogeneous unmanned cluster system; the tracking-leader generates a target signal tracked by the entire heterogeneous unmanned cluster system; the formation-leader and the follower are different types of agents in the heterogeneous unmanned cluster system respectively;
determining a motion model of a tracking-leader according to the macro motion state of the heterogeneous unmanned cluster system and bounded control input; the motion model of the tracking-leader is used for generating a reference track of the overall motion of the heterogeneous unmanned cluster system;
acquiring a communication topological relation of a heterogeneous unmanned cluster system; the union of the neighbor sets of all followers in the communication topological relation of the heterogeneous unmanned cluster system comprises all formation-leaders, and the action topologies of the followers are communicated; the action topology among the leaders is a spanning tree with a tracking-leader as a root node, and the action topology among the formation-leaders is undirected;
constructing a distributed time-varying formation tracking controller according to the motion model of the tracking-leader, the state of the formation-leader, the communication topological relation and the time-varying output formation vector; constructing a distributed surround-tracking controller according to the state of the formation-leader and the state of the follower;
constructing a formation-leader motion model according to the distributed time-varying formation tracking controller and the motion model of the tracking-leader; constructing a follower motion model according to the formation-leader motion model and the distributed surround-tracking controller;
tracking a reference trajectory of the tracking-leader using a formation-leader motion model time-varying formation;
the follower's output is converged into the convex hull of the formation-leader formation using a follower motion model.
2. The heterogeneous unmanned cluster formation surround tracking control method according to claim 1, wherein the determining a motion model of a tracking-leader according to a macro motion state of the heterogeneous unmanned cluster system and a bounded control input specifically comprises:
3. The heterogeneous unmanned cluster formation surround tracking control method according to claim 2, wherein the constructing a distributed time-varying formation tracking controller according to a tracking-leader motion model, a formation-leader state, the communication topological relation and a time-varying output formation vector specifically comprises:
using the formula hyi(t)=Yihi(t) determining a time-varying output queuing vector;
wherein,denotes a formation parameter, i is 1,2, …, N denotes the number of formation-leaders,representing the formation output matrix, hyi(t) is a time-varying output queuing vector,representing the state of the formation-leader,represents a pair v0Is determined by the distributed estimation of the time domain, represents the adaptive control gain; tau isiRepresenting a time-varying convoy tracking compensation input,μ denotes the normal number, K1i、Khi、K2i、ΥiAnd ΓiA matrix of gains is represented by a matrix of gains,a non-negative weight is represented by a non-negative weight,representing neighbor formation-leader j pairs v0Is calculated.
4. The heterogeneous unmanned cluster formation surround tracking control method according to claim 3, wherein the distributed time-varying formation tracking controller is constructed according to a tracking-leader motion model, a formation-leader state, the communication topological relation and a time-varying output formation vector, and specifically further comprises:
judging whether the time-varying output formation vector has compensation input or not;
If so, constructing a distributed time-varying formation tracking controller; if not, re-determining the time-varying output formation vector;
5. The heterogeneous unmanned cluster formation surround tracking control method according to claim 4, wherein the formation-leader motion model is constructed according to a distributed time-varying formation tracking controller and a motion model of a tracking-leader; constructing a follower motion model according to a formation-leader motion model and a distributed surround-tracking controller, and specifically comprising the following steps of:
6. The heterogeneous unmanned cluster formation surround tracking control method according to claim 5, wherein the formation-leader motion model is constructed according to a distributed time-varying formation tracking controller and a motion model of a tracking-leader; constructing a follower motion model according to the formation-leader motion model and the distributed surround-tracking controller, and specifically further comprising:
using formulasDetermining that a formation-leader achieves a desired time-varying output formation tracking condition;
using formulasDetermining a formation-leader-follower to achieve a desired output confounding condition
7. a heterogeneous unmanned cluster formation surround tracking control system is characterized by comprising:
the intelligent agent dividing module is used for determining a tracking-leader, a formation-leader and a follower according to the heterogeneous unmanned cluster system; the tracking-leader generates a target signal tracked by the entire heterogeneous unmanned cluster system; the formation-leader and the follower are different types of agents in the heterogeneous unmanned cluster system respectively;
the motion model determination module of the tracking-leader is used for determining the motion model of the tracking-leader according to the macro motion state of the heterogeneous unmanned cluster system and bounded control input; the motion model of the tracking-leader is used for generating a reference track of the overall motion of the heterogeneous unmanned cluster system;
the communication topological relation acquisition module is used for acquiring the communication topological relation of the heterogeneous unmanned cluster system; the union of the neighbor sets of all followers in the communication topological relation of the heterogeneous unmanned cluster system comprises all formation-leaders, and the action topologies of the followers are communicated; the action topology among the leaders is a spanning tree with a tracking-leader as a root node, and the action topology among the formation-leaders is undirected;
the controller construction module is used for constructing a distributed time-varying formation tracking controller according to the motion model of the tracking-leader, the state of the formation-leader, the communication topological relation and the time-varying output formation vector; constructing a distributed surround-tracking controller according to the state of the formation-leader and the state of the follower;
the motion model building module is used for building a formation-leader motion model according to the distributed time-varying formation tracking controller and the motion model of the tracking-leader; constructing a follower motion model according to the formation-leader motion model and the distributed surround-tracking controller;
a time-varying formation tracking module for tracking a reference trajectory of the tracking-leader by a time-varying formation using a formation-leader motion model;
and the enclosure control module is used for converging the output of the follower to a convex hull of the formation formed by the formation-leader by utilizing the follower motion model.
8. The heterogeneous unmanned cluster formation surround-track control method according to claim 7, wherein the motion model construction module of the track-leader specifically comprises:
a tracking-leader motion model determination unit for utilizing a formulaDetermining a motion model of the tracking-leader;
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