CN110673481A - Method and device for determining attribute data of unmanned aerial vehicle, electronic equipment and storage medium - Google Patents
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Abstract
本申请涉及无人机属性数据的确定方法、装置、电子设备及存储介质,该方法基于飞行速度范围,飞行高度范围,无人机的波束宽度、覆盖条件和子时间段的数据传输速率建立非凸问题模型,将非凸问题模型转换成多个基于目标时间的凸问题模型,从而确定无人机的飞行轨迹和波束宽度。本申请提供的无人机属性数据的确定方法,可以在无人机的飞行速度、高度、天线波束宽度受限的条件下,通过调整无人机的飞行轨迹和天线波束宽度,最小化无人机传输任务的完成时间。
The present application relates to a method, device, electronic device and storage medium for determining attribute data of an unmanned aerial vehicle. The method establishes a non-convex non-convex based on the range of flight speed, the range of flight height, the beam width of the drone, the coverage conditions and the data transmission rate of the sub-time period. The problem model converts the non-convex problem model into multiple target time-based convex problem models to determine the UAV's flight trajectory and beamwidth. The method for determining the attribute data of the UAV provided in this application can minimize the unmanned aerial vehicle by adjusting the flight trajectory and antenna beam width of the UAV under the condition that the flight speed, height and antenna beam width of the UAV are limited. The completion time of the machine transfer task.
Description
技术领域technical field
本申请涉及无人机通信技术领域,特别涉及一种无人机属性数据的确定方法、装置、电子设备及存储介质。The present application relates to the technical field of unmanned aerial vehicle communication, and in particular, to a method, device, electronic device and storage medium for determining attribute data of an unmanned aerial vehicle.
背景技术Background technique
近年来,无人机广泛应用于军事、民用领域,并有望在未来十年带来丰富的商业机会。在无人机的各项应用中,无人机辅助无线通信已经演变为一项非常具有发展前景的技术。与传统的地面通信相比,无人机通信主要具有以下三个优点。首先,无人机可以按需部署,灵活性高,运营成本低。其次,与地面信道相比,无人机与地面间的信道通常会经历更少的散射,因此形成视距链路的概率更高,从而为用户调度和资源分配提供更可靠的通信链路。最后,无人机可以动态调整其在三维空间中的位置来提高通信质量,或通过适当的轨迹设计来避免干扰。以上优点催生出大量的新应用,例如热点地区的蜂窝数据卸载,基础设施故障后的服务恢复,紧急情况下的移动数据中继或定制通信等。然而,在充分发挥无人机通信的潜力之前,还需要应对很多挑战。In recent years, drones have been widely used in military and civilian fields, and are expected to bring rich business opportunities in the next decade. In various applications of UAVs, UAV-assisted wireless communication has evolved into a very promising technology. Compared with traditional ground communication, UAV communication mainly has the following three advantages. First, drones can be deployed on demand with high flexibility and low operating costs. Second, compared to terrestrial channels, UAV-ground channels typically experience less scattering and thus have a higher probability of forming line-of-sight links, providing a more reliable communication link for user scheduling and resource allocation. Finally, UAVs can dynamically adjust their position in 3D space to improve communication quality, or avoid interference through proper trajectory design. The above advantages have given rise to a large number of new applications, such as cellular data offloading in hotspots, service restoration after infrastructure failures, mobile data relaying or customized communications in emergencies, etc. However, many challenges need to be addressed before the full potential of drone communications can be realized.
根据无人机的移动性,无人机辅助通信系统的研究大致可以分为两类。第一类,无人机作为静止的空中通信平台,为地面用户提供无处不在的无线覆盖。在此场景中,无人机部署问题得到了广泛的研究。这些工作通过优化无人机的高度或水平位置,来实现不同的设计目标,如最大化中断概率、覆盖面积、受服务的用户数量、吞吐量等。第二类,无人机作为移动的空中平台,为地面用户服务。几种典型的应用包括无人机辅助中继、信息传播/数据收集。与第一类研究相比,该类工作通过优化无人机的轨迹来获得更好的信道质量,从而进一步提高系统性能。According to the mobility of UAV, the research of UAV-assisted communication system can be roughly divided into two categories. In the first category, UAVs serve as stationary aerial communication platforms, providing ubiquitous wireless coverage for ground users. In this scenario, the UAV deployment problem has been extensively studied. These work by optimizing the altitude or horizontal position of the drone to achieve different design goals, such as maximizing outage probability, coverage area, number of users served, throughput, etc. In the second category, UAVs serve as mobile aerial platforms to serve ground users. Several typical applications include UAV-assisted relay, information dissemination/data collection. Compared with the first type of research, this type of work further improves the system performance by optimizing the trajectory of the UAV to obtain better channel quality.
然而,在大部分无人机通信的工作中,无人机的高度是固定的,其飞行轨迹被限制在一个水平面上,没有充分利用无人机的在垂直方向的移动性。此外,大部分研究无人机轨迹优化的工作都假设无人机配备全向天线,即可以在三维空间中的各个方向上辐射强度相等的信号。然而,实际上,只有在二维空间(即水平方向)才可以实现等辐射,从而实现全向天线。在现代通信系统中,具有可调波束宽度的定向天线已经广泛应用于各种场景中。因此,对配备定向天线的无人机,研究其轨迹设计问题具有现实意义。However, in most of the UAV communication work, the UAV's height is fixed, and its flight trajectory is limited to a horizontal plane, which does not fully utilize the UAV's mobility in the vertical direction. In addition, most work on UAV trajectory optimization assumes that UAVs are equipped with omnidirectional antennas, i.e., they can radiate signals of equal intensity in all directions in three-dimensional space. However, in practice, isoradiation can be achieved only in two-dimensional space (ie, the horizontal direction), thereby realizing an omnidirectional antenna. In modern communication systems, directional antennas with tunable beamwidths have been widely used in various scenarios. Therefore, it is of practical significance to study the trajectory design of UAVs equipped with directional antennas.
发明内容SUMMARY OF THE INVENTION
本申请实施例提供了一种无人机属性数据的确定方法、装置、电子设备及存储介质,可以在无人机的飞行速度、高度、天线波束宽度受限的条件下,通过调整无人机的飞行轨迹和天线波束宽度,最小化无人机传输任务的完成时间。The embodiments of the present application provide a method, device, electronic device and storage medium for determining attribute data of an unmanned aerial vehicle, which can adjust the unmanned aerial vehicle by adjusting the flying speed, height, and antenna beam width of the unmanned aerial vehicle under the condition that the flying speed, height, and antenna beam width of the unmanned aerial vehicle are limited. The flight trajectory and antenna beamwidth are optimized to minimize the completion time of the UAV transmission mission.
一方面,本申请实施例提供了一种无人机属性数据的确定方法,包括:On the one hand, an embodiment of the present application provides a method for determining attribute data of an unmanned aerial vehicle, including:
确定无人机的飞行速度范围,飞行高度范围,以及无人机的波束宽度;确定无人机基于无人机对应的用户的覆盖条件以及子时间段的数据传输速率;基于飞行速度范围,飞行高度范围,无人机的波束宽度、覆盖条件和子时间段的数据传输速率建立非凸问题模型;将非凸问题模型转换成多个基于目标时间的凸问题模型;基于多个凸问题模型确定无人机的飞行轨迹和波束宽度;其中,子时间段为预设时间内的一个时间段,目标时间小于预设时间。Determine the flight speed range, flight height range, and beam width of the UAV; determine the coverage conditions of the UAV based on the user corresponding to the UAV and the data transmission rate of the sub-time period; based on the flight speed range, the flight The height range, the beam width of the UAV, the coverage conditions and the data transmission rate of the sub-time period establish a non-convex problem model; convert the non-convex problem model into multiple target time-based convex problem models; The flight trajectory and beam width of the man-machine; wherein, the sub-time period is a time period within the preset time, and the target time is less than the preset time.
另一方面,本申请实施例提供了一种无人机属性数据的确定装置,包括:On the other hand, an embodiment of the present application provides a device for determining attribute data of an unmanned aerial vehicle, including:
第一确定模块,用于确定无人机的飞行速度范围,飞行高度范围,以及无人机的波束宽度;第二确定模块,用于确定无人机基于无人机对应的用户的覆盖条件以及子时间段的数据传输速率;第三确定模块,用于基于飞行速度范围,飞行高度范围,无人机的波束宽度、覆盖条件和子时间段的数据传输速率建立非凸问题模型;第四确定模块,用于将非凸问题模型转换成多个基于目标时间的凸问题模型;第五确定模块,用于基于多个凸问题模型确定无人机的飞行轨迹和波束宽度;其中,子时间段为预设时间内的一个时间段,目标时间小于预设时间。The first determination module is used to determine the flight speed range of the UAV, the flight height range, and the beam width of the UAV; the second determination module is used to determine the coverage conditions of the UAV based on the user corresponding to the UAV and The data transmission rate of the sub-period; the third determination module is used to establish a non-convex problem model based on the flight speed range, the flight height range, the beam width of the UAV, the coverage conditions and the data transmission rate of the sub-period; the fourth determination module , which is used to convert the non-convex problem model into multiple convex problem models based on target time; the fifth determination module is used to determine the flight trajectory and beam width of the UAV based on the multiple convex problem models; wherein, the sub-time period is A time period within the preset time, the target time is less than the preset time.
另一方面,本申请实施例提供了一种电子设备,电子设备包括处理器和存储器,存储器中存储有至少一条指令、至少一段程序、代码集或指令集,至少一条指令、至少一段程序、代码集或指令集由处理器加载并执行以实现上述的无人机属性数据的确定方法。On the other hand, an embodiment of the present application provides an electronic device, the electronic device includes a processor and a memory, and the memory stores at least one instruction, at least one segment of program, code set or instruction set, at least one instruction, at least one segment of program, code The set or instruction set is loaded and executed by the processor to implement the above-mentioned method for determining the attribute data of the drone.
另一方面,本申请实施例提供了一种计算机可读存储介质,存储介质中存储有至少一条指令、至少一段程序、代码集或指令集,至少一条指令、至少一段程序、代码集或指令集由处理器加载并执行以实现上述的无人机属性数据的确定方法。On the other hand, an embodiment of the present application provides a computer-readable storage medium, in which the storage medium stores at least one instruction, at least one piece of program, code set or instruction set, at least one instruction, at least one piece of program, code set or instruction set Loaded and executed by the processor to realize the above-mentioned method for determining the attribute data of the drone.
本申请实施例提供的无人机属性数据的确定方法、装置、电子设备及存储介质具有如下有益效果:The method, device, electronic device, and storage medium for determining attribute data of an unmanned aerial vehicle provided by the embodiments of the present application have the following beneficial effects:
通过确定无人机的飞行速度范围,飞行高度范围,以及无人机的波束宽度,确定无人机基于无人机对应的用户的覆盖条件以及子时间段的数据传输速率,并基于飞行速度范围,飞行高度范围,无人机的波束宽度、覆盖条件和子时间段的数据传输速率建立非凸问题模型,将非凸问题模型转换成多个基于目标时间的凸问题模型,从而确定无人机的飞行轨迹和波束宽度。本申请提供的无人机属性数据的确定方法,可以在无人机的飞行速度、高度、天线波束宽度受限的条件下,通过调整无人机的飞行轨迹和天线波束宽度,最小化无人机传输任务的完成时间。By determining the flight speed range of the drone, the flight height range, and the beam width of the drone, determine the coverage conditions of the drone based on the user corresponding to the drone and the data transmission rate of the sub-time period, and based on the flight speed range , the flight height range, the beam width of the UAV, the coverage conditions and the data transmission rate of the sub-time period to establish a non-convex problem model, convert the non-convex problem model into multiple convex problem models based on target time, so as to determine the UAV's flight path and beamwidth. The method for determining the attribute data of the UAV provided by this application can minimize the unmanned aerial vehicle by adjusting the flight trajectory and antenna beam width of the UAV under the condition that the flight speed, height and antenna beam width of the UAV are limited. The completion time of the machine transfer task.
附图说明Description of drawings
为了更清楚地说明本申请实施例中的技术方案,下面将对实施例描述中所需要使用的附图作简单地介绍,显而易见地,下面描述中的附图仅仅是本申请的一些实施例,对于本领域普通技术人员来讲,在不付出创造性劳动的前提下,还可以根据这些附图获得其他的附图。In order to illustrate the technical solutions in the embodiments of the present application more clearly, the following briefly introduces the drawings that are used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.
图1是本申请实施例提供的一种应用场景的示意图;1 is a schematic diagram of an application scenario provided by an embodiment of the present application;
图2是本申请实施例提供的一种无人机属性数据的确定方法的流程示意图;2 is a schematic flowchart of a method for determining attribute data of an unmanned aerial vehicle provided by an embodiment of the present application;
图3是本申请实施例提供的一种无人机飞行轨迹的仿真图;3 is a simulation diagram of a UAV flight trajectory provided by an embodiment of the present application;
图4是本申请实施例提供的一种无人机高度和波束宽度的仿真图;4 is a simulation diagram of the height and beam width of a UAV provided by an embodiment of the present application;
图5是本申请实施例提供的一种算法收敛曲线图;Fig. 5 is a kind of algorithm convergence curve diagram provided by the embodiment of the present application;
图6是本申请实施例提供的一种不同方案任务完成时间的仿真图;6 is a simulation diagram of the task completion time of a different scheme provided by an embodiment of the present application;
图7是本申请实施例提供的一种无人机属性数据的确定装置的结构示意图。FIG. 7 is a schematic structural diagram of an apparatus for determining attribute data of an unmanned aerial vehicle provided by an embodiment of the present application.
具体实施方式Detailed ways
下面将结合本申请实施例中的附图,对本申请实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本申请一部分实施例,而不是全部的实施例。基于本申请中的实施例,本领域普通技术人员在没有做出创造性劳动的前提下所获得的所有其他实施例,都属于本申请保护的范围。The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present application.
需要说明的是,本申请的说明书和权利要求书及上述附图中的术语“第一”、“第二”等是用于区别类似的对象,而不必用于描述特定的顺序或先后次序。应该理解这样使用的数据在适当情况下可以互换,以便这里描述的本申请的实施例能够以除了在这里图示或描述的那些以外的顺序实施。此外,术语“包括”和“具有”以及他们的任何变形,意图在于覆盖不排他的包含,例如,包含了一系列步骤或单元的过程、方法、系统、产品或服务器不必限于清楚地列出的那些步骤或单元,而是可包括没有清楚地列出的或对于这些过程、方法、产品或设备固有的其它步骤或单元。It should be noted that the terms "first", "second", etc. in the description and claims of the present application and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific sequence or sequence. It is to be understood that data so used may be interchanged under appropriate circumstances so that the embodiments of the application described herein can be practiced in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having" and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product or server comprising a series of steps or units is not necessarily limited to those expressly listed Rather, those steps or units may include other steps or units not expressly listed or inherent to these processes, methods, products or devices.
请参阅图1,图1是本申请实施例提供的一种应用场景的示意图,包括无人机101和用户102。例如在无人机101辅助的多播系统中,无人机101作为空中基站为多个地面用户102提供文件传输服务。Please refer to FIG. 1 . FIG. 1 is a schematic diagram of an application scenario provided by an embodiment of the present application, including a
通过确定无人机101的飞行速度范围,飞行高度范围,以及无人机101的波束宽度;其次,确定无人机101的覆盖条件以及子时间段的数据传输速率,子时间段为预设时间内的一个时间段,目标时间小于预设时间。基于飞行速度范围,飞行高度范围,无人机101的波束宽度、覆盖条件和子时间段的数据传输速率建立非凸问题模型,将非凸问题模型转换成多个基于目标时间的凸问题模型,同时保证用户102始终在无人机101的覆盖范围内,从而可以确定出最佳的无人机101的飞行轨迹和波束宽度。By determining the flight speed range of the
以下介绍本申请一种无人机属性数据的确定方法的具体实施例,图2是本申请实施例提供的一种无人机属性数据的确定方法的流程示意图,本说明书提供了如实施例或流程图的方法操作步骤,但基于常规或者无创造性的劳动可以包括更多或者更少的操作步骤。实施例中列举的步骤顺序仅仅为众多步骤执行顺序中的一种方式,不代表唯一的执行顺序。在实际中的系统或服务器产品执行时,可以按照实施例或者附图所示的方法顺序执行或者并行执行(例如并行处理器或者多线程处理的环境)。具体的如图2所示,该方法可以包括:A specific embodiment of a method for determining attribute data of an unmanned aerial vehicle of the present application is introduced below. FIG. 2 is a schematic flowchart of a method for determining attribute data of an unmanned aerial vehicle provided by an embodiment of the present application. The method operation steps of the flowchart, but may include more or less operation steps based on routine or non-creative work. The sequence of steps enumerated in the embodiments is only one of the execution sequences of many steps, and does not represent the only execution sequence. When an actual system or server product is executed, it can be executed sequentially or in parallel (for example, in a parallel processor or multi-threaded processing environment) according to the embodiments or the methods shown in the accompanying drawings. Specifically, as shown in Figure 2, the method may include:
S201:确定无人机的飞行速度范围,飞行高度范围,以及无人机的波束宽度。S201: Determine the flight speed range of the UAV, the flight height range, and the beam width of the UAV.
本申请实施例中,通过一个具体的应用功能场景进行说明,该应用场景为一个下行多播系统,该应用场景中,无人机作为飞行的基站向一组地面用户传输D比特的文件。这里采用三维笛卡尔坐标系,假设每个用户的坐标为其中wk∈R2 ×1为水平坐标。为了便于说明,采用离散化方法将飞行时间T分为N个步长为δt的等间隔子时间段,即T=Nδt。这里δt必须足够小,以确保在每个子时间段内无人机位置几乎不变。因此,无人机轨迹可以近似表示为其中,q[n]∈R2×1为无人机的水平坐标;h[n]为无人机的高度。确定无人机的最大水平飞行速度VL和最大垂直飞行速度VD,以及飞行最大高度hmax、最小高度hmin,则无人机飞行的限制条件可以根据公式(1)(2)(3)确定:In the embodiment of the present application, a specific application function scenario is used for description. The application scenario is a downlink multicast system. In this application scenario, the drone acts as a flying base station to transmit D-bit files to a group of ground users. The three-dimensional Cartesian coordinate system is used here, assuming that the coordinates of each user are where w k ∈ R 2 ×1 is the horizontal coordinate. For the convenience of description, the time of flight T is divided into N equally spaced sub-time segments with a step size of δ t by using a discretization method, that is, T=Nδ t . Here δt must be small enough to ensure that the UAV position is almost unchanged in each sub-period. Therefore, the UAV trajectory can be approximately expressed as Among them, q[n]∈R 2×1 is the horizontal coordinate of the UAV; h[n] is the height of the UAV. Determine the maximum horizontal flight speed VL and the maximum vertical flight speed V D of the UAV, as well as the maximum flight height h max and the minimum height h min , then the restrictions on the flight of the UAV can be based on formula (1)(2)(3 )Sure:
此外,无人机为了周期性的为地面用户服务,无人机需要在任务完成后返回到初始位置,即无人机的水平坐标需要满足公式(4):In addition, in order to periodically serve ground users, the UAV needs to return to the initial position after the task is completed, that is, the horizontal coordinate of the UAV needs to satisfy the formula (4):
q[1]=q[N],h[1]=h[N].……(4)q[1]=q[N], h[1]=h[N]. …(4)
本申请实施例中,无人机配备有一个波束宽度可调的定向天线,θ[n]和ψ[n]分别代表天线的方位角和仰角。假设其方位角和仰角的半功率波束宽度相等,即2Θ[n],其中(θ[n],ψ[n])方向上相应的天线增益可以根据公式(5)确定:In the embodiment of the present application, the UAV is equipped with a directional antenna with adjustable beam width, and θ[n] and ψ[n] represent the azimuth and elevation angles of the antenna, respectively. The half-power beamwidths are assumed to be equal in azimuth and elevation, i.e. 2Θ[n], where The corresponding antenna gain in the (θ[n],ψ[n]) direction can be determined according to formula (5):
其中,和g分别代表主瓣和副瓣的天线增益。in, and g represent the antenna gain of the main lobe and side lobe, respectively.
由于因此假设g=0;波束宽度受最小和最大波束宽度限制,且则无人机的波束宽度可以根据公式(6)确定:because So assume g = 0; the beamwidth is limited by the minimum and maximum beamwidths, and Then the beam width of the UAV can be determined according to formula (6):
S203:确定无人机基于无人机对应的用户的覆盖条件以及子时间段的数据传输速率;子时间段为预设时间内的一个时间段,目标时间小于预设时间。S203: Determine the coverage condition of the drone based on the user corresponding to the drone and the data transmission rate of the sub-time period; the sub-time period is a time period within a preset time, and the target time is less than the preset time.
一种可选的确定无人机基于无人机对应的用户的覆盖条件的实施方式中,包括确定无人机对应的用户的用户位置;确定无人机的飞行水平位置;基于用户位置、飞行水平位置、飞行高度范围和波束宽度确定覆盖条件。An optional implementation manner of determining the coverage conditions of the drone based on the user corresponding to the drone includes determining the user position of the user corresponding to the drone; determining the flight level position of the drone; Horizontal position, flight altitude range, and beamwidth determine coverage conditions.
一种可选的确定子时间段的数据传输速率的实施方式中,包括确定第一参考距离下的信道功率增益;基于信道功率增益、用户位置、飞行水平位置和飞行高度范围确定无人机和用户的信道功率增益;根据信道带宽、信道功率增益和无人机传输功率和高斯白噪的功率确定子时间段的数据传输速率。In an optional implementation manner of determining the data transmission rate of the sub-time period, it includes determining the channel power gain under the first reference distance; The channel power gain of the user; the data transmission rate of the sub-period is determined according to the channel bandwidth, the channel power gain, the transmission power of the UAV and the power of the Gaussian white noise.
基于上述的应用场景继续说明,假设每个地面用户都配备了一个具有单位增益的全向天线。如图1所示,无人机天线主瓣覆盖的地面区域是以无人机水平投影为中心,半径为rc[n]=h[n]tanΘ[n]的圆形区域。为了保证所有地面用户总是在无人机的覆盖范围内,无人机基于无人机对应的用户的覆盖条件可以根据公式(7)确定:Based on the above application scenario, it is assumed that each ground user is equipped with an omnidirectional antenna with unity gain. As shown in Figure 1, the ground area covered by the main lobe of the UAV antenna is a circular area with a radius of rc[n]=h[n] tanΘ [n] centered on the horizontal projection of the UAV. In order to ensure that all ground users are always within the coverage of the UAV, the coverage conditions of the UAV based on the user corresponding to the UAV can be determined according to formula (7):
假设空对地通信信道为视距链路,且由于无人机移动带来的多普勒效应可以得到完美的补偿。根据自由空间路径损耗模型,无人机到用户的信道功率增益可以根据公式(8)确定:It is assumed that the air-to-ground communication channel is a line-of-sight link, and the Doppler effect caused by the movement of the UAV can be perfectly compensated. According to the free space path loss model, the channel power gain from the UAV to the user can be determined according to formula (8):
其中,β0表示参考距离d0=1处的信道功率增益。Among them, β 0 represents the channel power gain at the reference distance d 0 =1.
用户在时刻n的子时间段的数据传输速率可以根据公式(9)确定:The data transmission rate of the user in the sub-period of time n can be determined according to formula (9):
其中,B为信道带宽;P表示无人机传输功率;σ2表示接收处加性高斯白噪声的功率。Among them, B is the channel bandwidth; P represents the transmission power of the UAV; σ 2 represents the power of the additive white Gaussian noise at the receiver.
S205:基于飞行速度范围,飞行高度范围,无人机的波束宽度、覆盖条件和子时间段的数据传输速率建立非凸问题模型。S205: Establish a non-convex problem model based on the flight speed range, the flight height range, the beam width of the UAV, the coverage conditions and the data transmission rate of the sub-time period.
S207:将非凸问题模型转换成多个基于目标时间的凸问题模型。S207: Convert the non-convex problem model into multiple target time-based convex problem models.
S209:基于多个凸问题模型确定无人机的飞行轨迹和波束宽度。S209: Determine the flight trajectory and beam width of the UAV based on multiple convex problem models.
一种可选的将非凸问题模型转换成多个基于目标时间的凸问题模型的实施方式中,包括基于非凸问题模型确定多个目标时间;将非凸问题模型转换成多个基于目标时间的凸问题模型。An optional implementation of converting a non-convex problem model into multiple target time-based convex problem models includes determining multiple target times based on the non-convex problem model; converting the non-convex problem model into multiple target time-based model of the convex problem.
本申请实施例中,无人机的飞行轨迹包括无人机水平方向的飞行轨迹和竖直方向的飞行轨迹。In the embodiment of the present application, the flight trajectory of the drone includes the flight trajectory in the horizontal direction and the flight trajectory in the vertical direction of the drone.
本申请实施例中,将非凸问题模型转换成一个基于目标时间的新非凸问题模型和一个基于新非凸问题的单调问题。对单调问题使用二分法可以确定多个目标时间,并将基于目标时间的非凸问题模型转换为多个基于目标时间的凸问题模型,直到单调问题取得最优解。如此,可以确定出最佳的无人机的飞行轨迹和波束宽度,即当无人机距离用户较近时,无人机飞行在较低的高度,天线波束宽度大。与现有技术相比,传输相同大小的文件所需要的目标时间更短。In the embodiment of the present application, the non-convex problem model is converted into a new non-convex problem model based on target time and a monotonic problem based on the new non-convex problem. Using dichotomy for a monotonic problem can determine multiple target times and transform a non-convex problem model based on target time into multiple convex problem models based on target time until the monotonic problem is optimally solved. In this way, the optimal UAV flight trajectory and beam width can be determined, that is, when the UAV is closer to the user, the UAV flies at a lower altitude and the antenna beam width is large. The target time required to transfer a file of the same size is shorter compared to the prior art.
本申请实施例中,建立非凸问题模型可以是公式(10):In this embodiment of the present application, establishing a non-convex problem model may be formula (10):
为了求解公式(10),本申请实施例引入两个更容易处理的问题,然后证明通过解决这两个新问题可以得到公式(10)的最优解。基于上述的应用场景继续说明,定义公式(10)的左式吞吐量与文件数据的比值为比率,那么第一个引入的问题是最大化用户之间最小的比率,该问题可以表述为公式(11):In order to solve the formula (10), the embodiments of the present application introduce two easier-to-handle problems, and then prove that the optimal solution of the formula (10) can be obtained by solving these two new problems. Based on the above application scenario, the ratio of the left-hand throughput to the file data of formula (10) is defined as the ratio, then the first introduced problem is to maximize the minimum ratio between users, which can be expressed as the formula ( 11):
对于给定的N,让η*(N)作为公式(11)的最优值。对于任意给定的N,当且仅当η*(N)≥1时任务完成,则目标时间可以根据公式(12)确定:For a given N, let η * (N) be the optimal value of equation (11). For any given N, if and only if η * (N) ≥ 1, the task is completed, then the target time can be determined according to formula (12):
显然N只出现在公式(11b)的求和上限中,因此η*(N)关于N单调递增。通过使用二分法,确定多个目标时间,直到约束公式(12b)取到等号。Obviously N only appears in the upper limit of the summation of formula (11b), so η * (N) increases monotonically with respect to N. By using the bisection method, multiple target times are determined until the constraint formula (12b) takes an equal sign.
为了求解无人机的飞行轨迹和波束宽度,将公式(11)等价转化为公式(13):In order to solve the flight trajectory and beam width of the UAV, formula (11) is equivalently transformed into formula (13):
由于公式(13)仍是非凸问题,这里使用SCA技术,用全局凹下界替换非凹项。由于是关于Θ2[n]和h2[n]+||q[n]-wk||2的凸函数,如此可以获得该函数在{qr[n],hr[n],Θr[n]}处的一阶泰勒展开作为下界,即公式(14):Since Equation (13) is still a non-convex problem, the SCA technique is used here to replace the non-concave term with a global concave lower bound. because is a convex function with respect to Θ 2 [n] and h 2 [n]+||q[n]-w k || 2 , so that the function can be obtained in {q r [n],h r [n],Θ The first-order Taylor expansion at r [n]} serves as the lower bound, which is Equation (14):
其中,in,
对于给定点{hr[n],Θr[n]},可以根据公式(15)确定(h[n]tanΘ[n])2的全局下界为:For a given point {h r [n],Θ r [n]}, the global lower bound of (h[n]tanΘ[n]) 2 can be determined according to equation (15) as:
其中, in,
根据SCA原则,公式(13b)替换为公式(16):According to the SCA principle, formula (13b) is replaced by formula (16):
进一步,将公式(16)转化为以下SOC约束:Further, Equation (16) is transformed into the following SOC constraints:
因此,给定点{qr[n],hr[n],Θr[n]},公式(13)可以近似为公式(18):Therefore, given the points {q r [n], h r [n], Θ r [n]}, Equation (13) can be approximated as Equation (18):
如此,将非凸问题模型转换成基于目标时间的凸问题模型,公式(18)是一个凸问题,使用标准的凸优化工具包,例如CVX,可以确定无人机的飞行轨迹和波束宽度。In this way, converting the non-convex problem model into a target time-based convex problem model, Equation (18) is a convex problem, and using a standard convex optimization toolkit such as CVX, the UAV's flight trajectory and beamwidth can be determined.
下面基于本申请实施例提出的方法以及具体的实验数据进行仿真实验。Simulation experiments are performed below based on the methods proposed in the embodiments of the present application and specific experimental data.
对于一个无人机辅助多播通信系统,设置用户个数为K=6,无人机最大飞行高度hmax=250m,最小飞行高度为hmin=70m,最大水平飞行速度VL=50m/s,最大垂直飞行速度VD=20m/s,最大波束宽度最小波束宽度无人机最大发射功率P=0.01W,带宽B=10MHZ,噪声功率σ2=2×10-11W,距离为1时的信道增益β0=-50,子时间段间隔δt=0.2s。初始化轨迹q0[n]为以用户几何中心wc为圆心,为半径的圆,其中初始化高度为h0[n]∈[hmin,hmax],初始化波束宽度 For a UAV-assisted multicast communication system, set the number of users to K=6, the maximum UAV flight height h max =250m, the minimum flight height hmin =70m, and the maximum horizontal flight speed VL =50m/s , the maximum vertical flight speed V D =20m/s, the maximum beam width Minimum beam width The maximum transmit power of the UAV is P=0.01W, the bandwidth B=10MHZ, the noise power σ 2 =2×10 -11 W, the channel gain β 0 =-50 when the distance is 1, and the sub-time interval δ t =0.2s . The initialized trajectory q 0 [n] takes the user geometric center w c as the center of the circle, is a circle of radius, where Initialize the height as h 0 [n]∈[h min ,h max ], initialize the beam width
请参阅图3,图3(a)是本申请实施例提供的一种无人机在D=42Mbits下的飞行轨迹的仿真图,图3(b)是本申请实施例提供的一种无人机在D=315Mbits下的飞行轨迹的仿真图。可以看出随着D的增加,飞行的飞行轨迹扩大,其飞行在靠近用户上方的位置以获得更好地通信质量。与现有技术OMA方案相比,本申请提出的SO方案中的无人机动态调整高度以平衡水平轨迹和波束宽度,充分利用了空间自由度。Please refer to FIG. 3, FIG. 3(a) is a simulation diagram of the flight trajectory of an unmanned aerial vehicle provided by an embodiment of the present application under D=42Mbits, and FIG. 3(b) is an unmanned aerial vehicle provided by an embodiment of the present application. The simulation diagram of the flight trajectory of the aircraft under D=315Mbits. It can be seen that as D increases, the flight trajectory of the flight expands, and it flies close to the top of the user for better communication quality. Compared with the prior art OMA solution, the UAV in the SO solution proposed in this application dynamically adjusts the height to balance the horizontal trajectory and the beam width, making full use of the spatial freedom.
请参阅图4,图4(a)是本申请实施例提供的一种无人机在D=42Mbits下高度和波束宽度的仿真图,图4(b)是本申请实施例提供的一种无人机在D=315Mbits下高度和波束宽度的仿真图。可以看出当无人机飞行在距离部分用户较近时,无人机飞行在较低的高度,此时天线波束宽度较大,否则,无人机动态的调整其高度和波束宽度以满足覆盖要求。Please refer to FIG. 4, FIG. 4(a) is a simulation diagram of the height and beam width of a UAV provided by an embodiment of the present application at D=42Mbits, and FIG. 4(b) is a simulation diagram of a drone provided by an embodiment of the present application. Simulation diagram of height and beam width of man-machine at D=315Mbits. It can be seen that when the drone is flying close to some users, the drone is flying at a lower altitude, and the antenna beam width is larger at this time. Otherwise, the drone dynamically adjusts its height and beam width to meet the coverage. Require.
请参阅图5,图5是本申请实施例提供的一种算法收敛曲线图。在T=50s时,基于本申请实施例提供的方法的算法在大约9次后收敛,速度快。Please refer to FIG. 5. FIG. 5 is a convergence curve diagram of an algorithm provided by an embodiment of the present application. When T=50s, the algorithm based on the method provided by the embodiment of the present application converges after about 9 times, and the speed is fast.
请参阅图6,图6是本申请实施例提供的一种不同方案任务完成时间的仿真图。如图6所示,传输不同大小的文件,本申请实施例提供的方法与现有方案的任务完成时间不同,可以看出本申请实施例提供的方法SO完成任务的时间最快。Please refer to FIG. 6. FIG. 6 is a simulation diagram of a task completion time of a different scheme provided by an embodiment of the present application. As shown in FIG. 6 , when files of different sizes are transmitted, the method provided by the embodiment of the present application has different task completion time from the existing solution. It can be seen that the method SO provided by the embodiment of the present application has the fastest time to complete the task.
本申请实施例还提供了一种无人机属性数据的确定装置,图7是本申请实施例提供的一种无人机属性数据的确定装置的结构示意图,如图7所示,该装置包括:An embodiment of the present application further provides a device for determining attribute data of an unmanned aerial vehicle. FIG. 7 is a schematic structural diagram of a device for determining attribute data of an unmanned aerial vehicle provided by an embodiment of the present application. As shown in FIG. 7 , the device includes: :
第一确定模块701,用于确定无人机的飞行速度范围,飞行高度范围,以及无人机的波束宽度;a
第二确定模块702,用于确定无人机基于无人机对应的用户的覆盖条件以及子时间段的数据传输速率;The
第三确定模块703,用于基于飞行速度范围,飞行高度范围,无人机的波束宽度、覆盖条件和子时间段的数据传输速率建立非凸问题模型;The
第四确定模块704,用于将非凸问题模型转换成多个基于目标时间的凸问题模型;a
第五确定模块705,用于基于多个凸问题模型确定无人机的飞行轨迹和波束宽度;子时间段为预设时间内的一个时间段,目标时间小于预设时间。The
本申请实施例中的装置与方法实施例基于同样地申请构思。The apparatus and method embodiments in the embodiments of the present application are based on the same concept of the application.
本申请的实施例还提供了一种电子设备,电子设备包括处理器和存储器,存储器中存储有至少一条指令、至少一段程序、代码集或指令集,至少一条指令、至少一段程序、代码集或指令集由处理器加载并执行以实现上述无人机属性数据的确定方法。The embodiments of the present application also provide an electronic device, the electronic device includes a processor and a memory, and the memory stores at least one instruction, at least one program, code set or instruction set, at least one instruction, at least one program, code set or The instruction set is loaded and executed by the processor to realize the above determination method of the attribute data of the drone.
本申请的实施例还提供了一种存储介质,存储介质可设置于服务器之中以保存用于实现方法实施例中一种无人机属性数据的确定方法相关的至少一条指令、至少一段程序、代码集或指令集,该至少一条指令、该至少一段程序、该代码集或指令集由该处理器加载并执行以实现上述无人机属性数据的确定方法。Embodiments of the present application further provide a storage medium, where the storage medium can be set in a server to store at least one instruction, at least one section of program, at least one instruction, at least one piece of program, A code set or instruction set, the at least one instruction, the at least one piece of program, the code set or the instruction set is loaded and executed by the processor to implement the above method for determining the attribute data of the drone.
可选地,在本实施例中,上述存储介质可以位于计算机网络的多个网络服务器中的至少一个网络服务器。可选地,在本实施例中,上述存储介质可以包括但不限于:U盘、只读存储器(ROM,Read-Only Memory)、随机存取存储器(RAM,Random Access Memory)、移动硬盘、磁碟或者光盘等各种可以存储程序代码的介质。Optionally, in this embodiment, the above-mentioned storage medium may be located in at least one network server among multiple network servers of a computer network. Optionally, in this embodiment, the above-mentioned storage medium may include but is not limited to: a U disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a mobile hard disk, a magnetic Various media that can store program codes, such as discs or optical discs.
由上述本申请提供的无人机属性数据的确定方法、装置、电子设备或存储介质的实施例可见,本申请中通过确定无人机的飞行速度范围,飞行高度范围,以及无人机的波束宽度,确定无人机基于无人机对应的用户的覆盖条件以及子时间段的数据传输速率,并基于飞行速度范围,飞行高度范围,无人机的波束宽度、覆盖条件和子时间段的数据传输速率建立非凸问题模型,将非凸问题模型转换成基于目标时间的凸问题模型,从而确定无人机的飞行轨迹和波束宽度。本申请提供的无人机属性数据的方法,可以在无人机的飞行速度、高度、天线波束宽度受限的条件下,通过调整无人机的飞行轨迹和天线波束宽度,最小化无人机传输任务的完成时间。It can be seen from the above-mentioned embodiments of the method, device, electronic device or storage medium for determining the attribute data of the UAV provided by the present application that in the present application, the range of the flight speed, the range of the flight altitude, and the beam of the UAV is determined. Width, determine the coverage conditions of the drone based on the user's coverage conditions and the data transmission rate of the sub-time period, and based on the flight speed range, flight height range, the beam width of the drone, coverage conditions and data transmission in the sub-time period The rate establishes a non-convex problem model, converts the non-convex problem model into a target time-based convex problem model, and determines the UAV's flight trajectory and beam width. The method for UAV attribute data provided in this application can minimize the UAV by adjusting the UAV's flight trajectory and antenna beam width under the condition that the UAV's flight speed, height, and antenna beam width are limited. The completion time of the transfer task.
需要说明的是:上述本申请实施例先后顺序仅仅为了描述,不代表实施例的优劣。且上述对本说明书特定实施例进行了描述。其它实施例在所附权利要求书的范围内。在一些情况下,在权利要求书中记载的动作或步骤可以按照不同于实施例中的顺序来执行并且仍然可以实现期望的结果。另外,在附图中描绘的过程不一定要求示出的特定顺序或者连续顺序才能实现期望的结果。在某些实施方式中,多任务处理和并行处理也是可以的或者可能是有利的。It should be noted that: the above-mentioned order of the embodiments of the present application is only for description, and does not represent the advantages and disadvantages of the embodiments. And the foregoing describes specific embodiments of the present specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims can be performed in an order different from that in the embodiments and still achieve desirable results. Additionally, the processes depicted in the figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.
本说明书中的各个实施例均采用递进的方式描述,各个实施例之间相同相似的部分互相参见即可,每个实施例重点说明的都是与其他实施例的不同之处。尤其,对于设备实施例而言,由于其基本相似于方法实施例,所以描述的比较简单,相关之处参见方法实施例的部分说明即可。Each embodiment in this specification is described in a progressive manner, and the same and similar parts between the various embodiments may be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and reference may be made to the partial descriptions of the method embodiments for related parts.
本领域普通技术人员可以理解实现上述实施例的全部或部分步骤可以通过硬件来完成,也可以通过程序来指令相关的硬件完成,所述的程序可以存储于一种计算机可读存储介质中,上述提到的存储介质可以是只读存储器,磁盘或光盘等。Those of ordinary skill in the art can understand that all or part of the steps of implementing the above embodiments can be completed by hardware, or can be completed by instructing relevant hardware through a program, and the program can be stored in a computer-readable storage medium. The storage medium mentioned may be a read-only memory, a magnetic disk or an optical disk, etc.
以上所述仅为本申请的较佳实施例,并不用以限制本申请,凡在本申请的精神和原则之内,所作的任何修改、等同替换、改进等,均应包含在本申请的保护范围之内。The above descriptions are only preferred embodiments of the present application, and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the protection of the present application. within the range.
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