昨晚，累计292万人紧盯Flightradar24网站，航班跟踪的技术原理是什么？_大数据_刘燕

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昨晚，累计292万人紧盯Flightradar24网站，航班跟踪的技术原理是什么？

北京时间 8 月 3 日零时 18 分，飞行航班信息平台 Flightradar24 发布推文称，佩洛西搭乘的 C-40C 专机（呼号 SPAR19）在台北降落时有 70.8 万人进行实时追踪，SPAR19 创下 Flightradar24 平台实时追踪人数最高纪录。

凌晨 4 时 21 分，Flightradar24 发布推文称，这架呼号为 SPAR19 的飞机从吉隆坡起飞到降落在台北期间，有 292 万用户追踪了至少其中一段飞行航程动态。飞机降落时，有 70.8 万人进行实时追踪。这两项数据都创下 Flightradar24 的最高纪录。

Flightradar 24：实时追踪全球飞行航班

Flightradar 24 是一项全球航班跟踪服务，最初由瑞典航空爱好者创立，可以提供全球数千架飞机的实时信息。

Flightradar 24 可以实时跟踪来自全球 1200 多家航空公司的 180000 多个航班，往返于全球 4000 多个机场。可以在线跟踪当天飞行航班的飞行地图轨迹、飞机型号、出发地、目的地、海拔高度、飞行速度、经纬度、飞机雷达型号等信息。此外，多天以前的飞行航班信息也可以追踪到。

Flightradar24 提供的上述服务可在线使用，适用于 iOS 以及 Android 设备。用户如果想追踪某一航班的信息，可以直接登录 Flightradar24 官网（http://www.flightradar24.com/），输入航班信息或者点击地图中的航班，就可以追踪该航班飞行信息。

航班跟踪的工作原理

Flightradar24 结合了来自多个数据源的数据，包括 ADS-B、MLAT 和雷达数据。ADS-B、MLAT 和雷达数据与航空公司和机场的时刻表和航班状态数据汇总在一起，可以在 Flightradar24 官网（www.flightradar24.com）和应用程序（https://www.flightradar24.com/apps）中实现航班跟踪功能。

ADS-B 系统

Flightradar24 用于接收航班飞行信息的主要技术称为广播式自动相关监视系统。下图很好地解释了 ADS-B 技术。

1、飞机从 GPS 导航源（卫星）获取其位置

2、飞机上的 ADS-B 应答器传输包含位置（以及更多内容）的信号

3、ADS-B 信号由连接到 Flightradar24 的接收器接收

4、接收器向 Flightradar24 发送数据

5、数据显示在 www.flightradar24.com 和 Flightradar24 应用程序中

ADS-B 是一项正在开发中的相对较新的技术，目前，它还很少被空中交通管制 (ATC) 使用。Flightradar 24 估计，大约 70% 的商用客机（欧洲 80%，美国 60%）配备了 ADS-B 应答器。对于通用航空来说，这个数字可能低于 20%。不过，配备 ADS-B 接收器的飞机的比例正在稳步增加，逐渐成为全球大多数飞机的强制要求。在强制要求的情况下，ADS-B 将取代初级雷达，成为空中交通管制中心使用的主要监视方法。

Flightradar24 在全球拥有一个超过 2 万个 ADS-B 接收器的网络，这些接收器从带有 ADS-B 应答器的飞机接收飞行信息，并将这些信息发送到 Flightradar24 的服务器。由于使用的高频频率（1090 MHz），每个接收器的覆盖范围被限制在所有方向上大约 250-450 公里（150-250 英里），具体取决于位置。飞机飞行距离接收器越远，它必须飞得越高才能被接收器覆盖。因为距离的限制，使得 ADS-B 目前对海洋的覆盖变得非常困难。

在巡航高度（30,000 英尺以上），Flightradar24 覆盖了欧洲和美国的 100%（区域）。在加拿大、墨西哥、加勒比、委内瑞拉、哥伦比亚、厄瓜多尔、秘鲁、巴西、南非、俄罗斯、中东、巴基斯坦、印度、中国、日本、泰国、马来西亚、印度尼西亚、澳大利亚、新西兰，ADS-B 的覆盖和范围也不错。在世界其他地区，ADS-B 的覆盖范围各不相同。Flightradar24 正在不断通过 FR24 接收器在世界各地增加覆盖范围。

MLAT

在一些覆盖多个FR24 接收器的地区，Flightradar24 还使用一种到达时间差 (TDOA) 的方法，借助多点定位(MLAT)计算未配备 ADS-B 的飞机的位置。通过测量从使用老式

ModeS 应答器的飞机接收信号所需的时间，就可以计算出这些飞机的位置。需要 4 个或更多的 fr24 接收器，接收来自同一架飞机的信号，才能使 MLAT 工作。MLAT 的覆盖范围只能在大约 3,000-10,000 英尺以上实现，因为随着高度的增加，四个或更多的接收器接收应答器信号的概率增加。

目前，欧洲和北美的大部分地区都被 3,000-10,000 英尺以上的 MLAT 覆盖。墨西哥、巴西、南非、印度、中国、日本、泰国、马来西亚、印度尼西亚、澳大利亚和新西兰也有一些 MLAT 覆盖。随着 Flightradar24 继续向网络添加新的接收器，更多地区将获得 MLAT 覆盖。

卫星

基于卫星的航班跟踪是 Flightradar24 寻求全球 ADS-B 覆盖的最新举措。配备 ADS-B 接收器的卫星从地面 ADS-B 网络覆盖区域之外的飞机收集数据，并将该数据发送到 Flightradar24 网络。Flightradar24 上可用的基于卫星的 ADS-B 数据来自多个供应商。由于提供数据的卫星数量及其位置是动态的，因此卫星覆盖范围也各不相同。通常，基于卫星的 ADS-B 增加了无法进行地面接收的海洋上空飞行的覆盖范围。只有配备 ADS-B 应答器的飞机才能通过卫星被跟踪。

估计

当一架飞机飞出覆盖范围时，如果航班目的地已知，Flightradar24 会持续估计飞机的位置长达 2 小时。对于没有已知目的地的飞机，位置估计可达 10 分钟。位置是根据许多不同的参数计算出来的，且在大多数情况下相当准确，但对于长途飞行来说，在最坏的情况下，位置可能会偏离约 100 公里(55 英里)。在设置中有一个选项，可以设置多长时间你想看到估计的飞机在地图上。

如何开发一款航班跟踪程序

本教程将帮助大家使用 FlightRadar24（https://cesium.com/blog/2020/08/13/flightradar24/）收集到的雷达数据，构建自己的第一款 Cesium 应用程序，以可视化方式追踪从旧金山到哥本哈根的真实航班。

接下来，你将学习如何：

在 Web 上设置并部署 Cesium 应用
添加全球 3D 建筑物、地形与图像基础层
通过位置列表，准确显示飞机的持续行进情况

前期准备

我们将从 Cesium ion（用于流传输和 3D 内容托管的开放平台）获取全球卫星图像、3D 建筑与地形数据。

如果您还没有 Cesium ion 账户，请点击此处（https://cesium.com/ion/signup）免费注册。

在登录完成后：

转向 Access Tokens（https://cesium.com/ion/tokens）选项卡。

请注意默认令牌（https://cesium.com/ion/signin/tokens）旁的复制按钮，我们会在下一步操作中使用这个令牌。

Cesium ion 是一个用于流传输和 3D 内容托管的开放平台，您可以使用其中提供的全球精选数据创建自己的实际应用。

1、设置 Cesium 应用

这里我们使用开源 JS 引擎 CesiumJS 创建自己的应用，同时使用在线 IDE Glitch 托管应用成果。

使用基础模板创建一个新的 Glitch 项目（https://glitch.com/edit/#!/remix/cesium-template）。

单击左侧面板中的 index.html，查看应用程序代码。

将 your_token_here 替换为我们从令牌页面处获取的访问令牌。

点击上方的 Show，再选择 Next to The Code 运行应用。

到这里，index.html 中的代码会执行三项操作：

导入 CesiumJS 库。通过以下两行加载 JS 和 CSS 文件：

<script src="https://cesium.com/downloads/cesiumjs/releases/1.96/Build/Cesium/Cesium.js"></script><link href="https://cesium.com/downloads/cesiumjs/releases/1.96/Build/Cesium/Widgets/widgets.css" rel="stylesheet">

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为场景添加一个 HTML 容器:

 <div id="cesiumContainer"></div>.

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初始化查看器:

const viewer = new Cesium.Viewer('cesiumContainer');

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现在我们已经在浏览器中运行起最基础的 CesiumJS 应用程序，其中包含来自 Cesium ion 的全球卫星图像。

配置自动刷新

Glitch 会在每次代码更改时，自动刷新当前页面。您可以单击左上角的项目名称并取消相应勾选框，借此切换为不自动刷新：

使用应用窗口上方的刷新按钮，即可重新运行当前应用：

2、添加全球 3D 建筑物与地形

下面，我们在场景中添加一些全局图层。您的 Cesium ion 账户默认可以访问以下资产：

Cesium World Terrain（https://cesium.com/platform/cesium-ion/content/cesium-world-terrain/）——高分辨率地形，精度可达1米。

Cesium OSM Building（https://cesium.com/platform/cesium-ion/content/cesium-osm-buildings/）——由 OpenStreetMap 提供超过 3.5 亿座建筑物的数据。

Bing Maps Aerial Imagery——分辨率达 15 厘米的全球卫星影像。

到这里，您的应用已经用上 Bing Maps 层了。

1 在 index.html 中，使用以下代码替换掉您的 JS 代码，但请保留之前使用的访问令牌行。

// Keep your `Cesium.Ion.defaultAccessToken = 'your_token_here'` line from before here.const viewer = new Cesium.Viewer('cesiumContainer', {terrainProvider: Cesium.createWorldTerrain() });

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2 通过单击和拖动来探索场景。手动时按住 CTRL 键可以调整相机角度。

请注意，放大时会加载更多高级细节，请根据实际准确性需求选择可视化比例。

这里我们使用的是 3D Tiles，一种能够将内容流传输至任意设备的开放标准。感兴趣的朋友请点击此处（https://cesium.com/docs/tutorials/ion-intro/）了解如何将自有数据转换为 3D Tiles。

3、可视化各单独样本

FlightRadar24 使用多种方法追踪空中交通，包括雷达信号。为简单起见，这里我们将雷达数据直接复制到应用程序当中。但大家之后也可以扩展相应代码以解析原始数据，甚至在样本从服务器传递至应用程序的过程中，对空中交通进行实时可视化。感兴趣的朋友可以点击此处（https://s3.amazonaws.com/cesiumjs/downloads/FlightRadar24_SFO_to_CPH_SK936.csv）下载航班原始数据。

1 添加以下代码，即可对场景中的单一点位进行可视化，并引导相机前往该点。

2 点击红点以查看附加说明。此描述可用于附加信息，例如每个点位的确切位置或捕捉时间。

// STEP 3 CODE (first point)// This is one of the first radar samples collected for our flight.const dataPoint = { longitude: -122.38985, latitude: 37.61864, height: -27.32 };// Mark this location with a red point.const pointEntity = viewer.entities.add({description: `First data point at (${dataPoint.longitude}, ${dataPoint.latitude})`,position: Cesium.Cartesian3.fromDegrees(dataPoint.longitude, dataPoint.latitude, dataPoint.height),point: { pixelSize: 10, color: Cesium.Color.RED }});// Fly the camera to this point.viewer.flyTo(pointEntity);

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4、要对完整雷达样本进行可视化，请将以上代码（第 3 步）替换为以下代码片段。

// STEP 3 CODE (all points)// These are all the radar points from this flight.const flightData = JSON.parse(  '[{"longitude":-122.39053,"latitude":37.61779,"height":-27.32},{"longitude":-122.39035,"latitude":37.61803,"height":-27.32},{"longitude":-122.39019,"latitude":37.61826,"height":-27.32},{"longitude":-122.39006,"latitude":37.6185,"height":-27.32},{"longitude":-122.38985,"latitude":37.61864,"height":-27.32},{"longitude":-122.39005,"latitude":37.61874,"height":-27.32},{"longitude":-122.39027,"latitude":37.61884,"height":-27.32},{"longitude":-122.39057,"latitude":37.61898,"height":-27.32},{"longitude":-122.39091,"latitude":37.61912,"height":-27.32},{"longitude":-122.39121,"latitude":37.61926,"height":-27.32},{"longitude":-122.39153,"latitude":37.61937,"height":-27.32},{"longitude":-122.39175,"latitude":37.61948,"height":-27.32},{"longitude":-122.39207,"latitude":37.6196,"height":-27.32},{"longitude":-122.39247,"latitude":37.61983,"height":-27.32},{"longitude":-122.39253,"latitude":37.62005,"height":-27.32},{"longitude":-122.39226,"latitude":37.62048,"height":-27.32},{"longitude":-122.39207,"latitude":37.62075,"height":-27.32},{"longitude":-122.39186,"latitude":37.62106,"height":-27.32},{"longitude":-122.39172,"latitude":37.62127,"height":-27.32},{"longitude":-122.39141,"latitude":37.62174,"height":-27.32},{"longitude":-122.39097,"latitude":37.62227,"height":-27.32},{"longitude":-122.39061,"latitude":37.6224,"height":-27.31},{"longitude":-122.39027,"latitude":37.62249,"height":-27.31},{"longitude":-122.38993,"latitude":37.62256,"height":-27.31},{"longitude":-122.3895,"latitude":37.62267,"height":-27.31},{"longitude":-122.3889,"latitude":37.62256,"height":-27.31},{"longitude":-122.38854,"latitude":37.62242,"height":-27.31},{"longitude":-122.38814,"latitude":37.62225,"height":-27.31},{"longitude":-122.38778,"latitude":37.62209,"height":-27.31},{"longitude":-122.38744,"latitude":37.62195,"height":-27.31},{"longitude":-122.38671,"latitude":37.62164,"height":-27.31},{"longitude":-122.38638,"latitude":37.62151,"height":-27.31},{"longitude":-122.38604,"latitude":37.62136,"height":-27.31},{"longitude":-122.38571,"latitude":37.62123,"height":-27.31},{"longitude":-122.38512,"latitude":37.62098,"height":-27.31},{"longitude":-122.3848,"latitude":37.62084,"height":-27.31},{"longitude":-122.38453,"latitude":37.62074,"height":-27.31},{"longitude":-122.38425,"latitude":37.62062,"height":-27.3},{"longitude":-122.38397,"latitude":37.62049,"height":-27.3},{"longitude":-122.38372,"latitude":37.62039,"height":-27.3},{"longitude":-122.3835,"latitude":37.6203,"height":-27.3},{"longitude":-122.38324,"latitude":37.62019,"height":-27.3},{"longitude":-122.38271,"latitude":37.61996,"height":-27.3},{"longitude":-122.38248,"latitude":37.61986,"height":-27.3},{"longitude":-122.38191,"latitude":37.61962,"height":-27.3},{"longitude":-122.38159,"latitude":37.6195,"height":-27.3},{"longitude":-122.38126,"latitude":37.61935,"height":-27.3},{"longitude":-122.38058,"latitude":37.61906,"height":-27.3},{"longitude":-122.38026,"latitude":37.61894,"height":-27.3},{"longitude":-122.37955,"latitude":37.61863,"height":-27.3},{"longitude":-122.37913,"latitude":37.61847,"height":-27.3},{"longitude":-122.3781,"latitude":37.61813,"height":-27.3},{"longitude":-122.37763,"latitude":37.61799,"height":-27.29},{"longitude":-122.37663,"latitude":37.61768,"height":-27.29},{"longitude":-122.37617,"latitude":37.61753,"height":-27.29},{"longitude":-122.37561,"latitude":37.61736,"height":-27.29},{"longitude":-122.37532,"latitude":37.61727,"height":-27.29},{"longitude":-122.37506,"latitude":37.61718,"height":-27.29},{"longitude":-122.37468,"latitude":37.61704,"height":-27.29},{"longitude":-122.37436,"latitude":37.61689,"height":-27.29},{"longitude":-122.37402,"latitude":37.61674,"height":-27.29},{"longitude":-122.37362,"latitude":37.61657,"height":-27.29},{"longitude":-122.3732,"latitude":37.6164,"height":-27.29},{"longitude":-122.37235,"latitude":37.61604,"height":-27.29},{"longitude":-122.37198,"latitude":37.61588,"height":-27.29},{"longitude":-122.3716,"latitude":37.61573,"height":-27.28},{"longitude":-122.3712,"latitude":37.61555,"height":-27.28},{"longitude":-122.37032,"latitude":37.61518,"height":-27.28},{"longitude":-122.36938,"latitude":37.61476,"height":-27.28},{"longitude":-122.36872,"latitude":37.6143,"height":-27.28},{"longitude":-122.36811,"latitude":37.61387,"height":-27.28},{"longitude":-122.36747,"latitude":37.61352,"height":-27.28},{"longitude":-122.36672,"latitude":37.61321,"height":-27.28},{"longitude":-122.36602,"latitude":37.61292,"height":-27.28},{"longitude":-122.3655,"latitude":37.61269,"height":-27.28},{"longitude":-122.36498,"latitude":37.61247,"height":-27.27},{"longitude":-122.3639,"latitude":37.61203,"height":-27.27},{"longitude":-122.36337,"latitude":37.6118,"height":-27.27},{"longitude":-122.36254,"latitude":37.61146,"height":-27.27},{"longitude":-122.36203,"latitude":37.61124,"height":-27.27},{"longitude":-122.36154,"latitude":37.61103,"height":-27.27},{"longitude":-122.36106,"latitude":37.61082,"height":-27.27},{"longitude":-122.36029,"lati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Create a point for each.for (let i = 0; i < flightData.length; i++) {  const dataPoint = flightData[i];  viewer.entities.add({    description: `Location: (${dataPoint.longitude}, ${dataPoint.latitude}, ${dataPoint.height})`,    position: Cesium.Cartesian3.fromDegrees(dataPoint.longitude, dataPoint.latitude, dataPoint.height),    point: { pixelSize: 10, color: Cesium.Color.RED }  });}

复制代码

现在，我们已经可以看到航班的完整雷达样本了，从登机口、跑道、一直到降落在哥本哈根机场的全过程。

我们使用的是什么坐标系？

CesiumJS 中的坐标，使用的是 ECEF 格式的 Cartesian3 类。在这套系统中，原点（0，0，0）代表地球的地心。

因此，我们才使用 Cartesian3.fromDegrees 将经度、纬度和高度转换为 ECEF 中的 X、Y 和 Z。

CesiumJS 的高度单位为米，与 WGS84 保持一致。我们对雷达数据进行了预处理，借此将相对平均海平面高度的英尺转换为米。

5、随时间推移实现航班轨迹可视化

到这里，我们已经完成了对雷达样本的可视化。CesiumJS 内置支持，允许向持续收集到的样本间插值，因此可以看到飞机在任意给定时刻的所处位置。

我们还将创建一个 SampledPositionProperty ，用于存储各位置及时间戳。源数据不并不包含各样本的时间戳，但由于我们明确知道追踪的航班编号为 SK936，计划于太平洋标准时间 2020 年 3 月 9 日下午 4：10 起飞。这里，我们假设位置样本的采集间隔为 30 秒。

1 在 index.html 中将所有 JS 代码替换为以下代码，只保留开头确定的访问令牌行。

2 航班动画：

使用左下角的按钮播放/暂停动画。
单击并拖动询问时间轴，即可切换场景时间。
双击地面上的任意位置，即可解除相机与移动实体的绑定。

// STEP 4 CODE (replaces steps 2 and 3)// Keep your `Cesium.Ion.defaultAccessToken = 'your_token_here'` line from before here. const viewer = new Cesium.Viewer('cesiumContainer', {  terrainProvider: Cesium.createWorldTerrain()});const osmBuildings = viewer.scene.primitives.add(Cesium.createOsmBuildings());const flightData = JSON.parse(  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Initialize the viewer clock:  Assume the radar samples are 30 seconds apart, and calculate the entire flight duration based on that assumption.  Get the start and stop date times of the flight, where the start is the known flight departure time (converted from PST     to UTC) and the stop is the start plus the calculated duration. (Note that Cesium uses Julian dates. See     https://simple.wikipedia.org/wiki/Julian_day.)  Initialize the viewer's clock by setting its start and stop to the flight start and stop times we just calculated.   Also, set the viewer's current time to the start time and take the user to that time. */const timeStepInSeconds = 30;const totalSeconds = timeStepInSeconds * (flightData.length - 1);const start = Cesium.JulianDate.fromIso8601("2020-03-09T23:10:00Z");const stop = Cesium.JulianDate.addSeconds(start, totalSeconds, new Cesium.JulianDate());viewer.clock.startTime = start.clone();viewer.clock.stopTime = stop.clone();viewer.clock.currentTime = start.clone();viewer.timeline.zoomTo(start, stop);// Speed up the playback speed 50x.viewer.clock.multiplier = 50;// Start playing the scene.viewer.clock.shouldAnimate = true;// The SampledPositionedProperty stores the position and timestamp for each sample along the radar sample series.const positionProperty = new Cesium.SampledPositionProperty();for (let i = 0; i < flightData.length; i++) {  const dataPoint = flightData[i];  // Declare the time for this individual sample and store it in a new JulianDate instance.  const time = Cesium.JulianDate.addSeconds(start, i * timeStepInSeconds, new Cesium.JulianDate());  const position = Cesium.Cartesian3.fromDegrees(dataPoint.longitude, dataPoint.latitude, dataPoint.height);  // Store the position along with its timestamp.  // Here we add the positions all upfront, but these can be added at run-time as samples are received from a server.  positionProperty.addSample(time, position);  viewer.entities.add({    description: `Location: (${dataPoint.longitude}, ${dataPoint.latitude}, ${dataPoint.height})`,    position: position,    point: { pixelSize: 10, color: Cesium.Color.RED }  });}// STEP 4 CODE (green circle entity)// Create an entity to both visualize the entire radar sample series with a line and add a point that moves along the samples.const airplaneEntity = viewer.entities.add({  availability: new Cesium.TimeIntervalCollection([ new Cesium.TimeInterval({ start: start, stop: stop }) ]),  position: positionProperty,  point: { pixelSize: 30, color: Cesium.Color.GREEN },  path: new Cesium.PathGraphics({ width: 3 })});// Make the camera track this moving entity.viewer.trackedEntity = airplaneEntity;

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从这趟跨大西洋航班，我们可以看到 3D 可视化为何能大大降低数据的理解难度。不过雷达样本的连接线大多是直的，我们可以在 2D 地图上使用常见的 Web 墨卡托投影，用曲线表示飞机的起降轨迹。

6、上传飞机模型

最后一步，我们把飞机的 3D 模型添加到实体当中，替换掉简陋的绿色圆圈。

1 下载飞机的 3D 模型（https://s3.amazonaws.com/cesiumjs/downloads/Cesium_Air.glb）。

2 前往账户仪表板，将模型文件拖进此页面。

3 选择 3D Model（Convert to glTF），之后点击 Upload。

4 处理完成之后，通过在仪表板中选择新资产并查看右侧的预览窗口，即可找到资产 ID。

7、添加飞机模型

1 删除从以下行开始的之后所有代码：

// STEP 4 CODE (green circle entity)

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2 替换为以下代码。

3 将 your_asset_id 部分替换为你的资产 ID。

// STEP 6 CODE (airplane entity)async function loadModel() {  // Load the glTF model from Cesium ion.  const airplaneUri = await Cesium.IonResource.fromAssetId(your_asset_id);  const airplaneEntity = viewer.entities.add({    availability: new Cesium.TimeIntervalCollection([ new Cesium.TimeInterval({ start: start, stop: stop }) ]),    position: positionProperty,    // Attach the 3D model instead of the green point.    model: { uri: airplaneUri },    // Automatically compute the orientation from the position.    orientation: new Cesium.VelocityOrientationProperty(positionProperty),        path: new Cesium.PathGraphics({ width: 3 })  });    viewer.trackedEntity = airplaneEntity;}loadModel();

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现在，我们就有了能够跟随飞行雷达样本持续前进的飞机模型！如果大家有自己的 3D 模型，也可以尝试添加到场景中。

完整源代码

以下是此应用的完整源代码，其中包含 your_token_here 以及 your_asset_id 占位符。

<!DOCTYPE html><html lang="en"><head>  <script src="https://cesium.com/downloads/cesiumjs/releases/1.96/Build/Cesium/Cesium.js"></script>  <link href="https://cesium.com/downloads/cesiumjs/releases/1.96/Build/Cesium/Widgets/widgets.css" rel="stylesheet">  <link href="style.css" rel="stylesheet"></head><body>  <div id="cesiumContainer"></div>  <script>    // Your access token can be found at: https://cesium.com/ion/tokens.    // Replace `your_access_token` with your Cesium ion access token.    Cesium.Ion.defaultAccessToken = 'your_access_token';    // STEP 4 CODE (replaces steps 2 and 3)    // Keep your `Cesium.Ion.defaultAccessToken = 'your_token_here'` line from before here.     const viewer = new Cesium.Viewer('cesiumContainer', {      terrainProvider: Cesium.createWorldTerrain()    });    const osmBuildings = viewer.scene.primitives.add(Cesium.createOsmBuildings());    const flightData = JSON.parse(      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   );    /* Initialize the viewer clock:      Assume the radar samples are 30 seconds apart, and calculate the entire flight duration based on that assumption.      Get the start and stop date times of the flight, where the start is the known flight departure time (converted from PST         to UTC) and the stop is the start plus the calculated duration. (Note that Cesium uses Julian dates. See         https://simple.wikipedia.org/wiki/Julian_day.)      Initialize the viewer's clock by setting its start and stop to the flight start and stop times we just calculated.       Also, set the viewer's current time to the start time and take the user to that time.     */    const timeStepInSeconds = 30;    const totalSeconds = timeStepInSeconds * (flightData.length - 1);    const start = Cesium.JulianDate.fromIso8601("2020-03-09T23:10:00Z");    const stop = Cesium.JulianDate.addSeconds(start, totalSeconds, new Cesium.JulianDate());    viewer.clock.startTime = start.clone();    viewer.clock.stopTime = stop.clone();    viewer.clock.currentTime = start.clone();    viewer.timeline.zoomTo(start, stop);    // Speed up the playback speed 50x.    viewer.clock.multiplier = 50;    // Start playing the scene.    viewer.clock.shouldAnimate = true;    // The SampledPositionedProperty stores the position and timestamp for each sample along the radar sample series.    const positionProperty = new Cesium.SampledPositionProperty();    for (let i = 0; i < flightData.length; i++) {      const dataPoint = flightData[i];      // Declare the time for this individual sample and store it in a new JulianDate instance.      const time = Cesium.JulianDate.addSeconds(start, i * timeStepInSeconds, new Cesium.JulianDate());      const position = Cesium.Cartesian3.fromDegrees(dataPoint.longitude, dataPoint.latitude, dataPoint.height);      // Store the position along with its timestamp.      // Here we add the positions all upfront, but these can be added at run-time as samples are received from a server.      positionProperty.addSample(time, position);      viewer.entities.add({        description: `Location: (${dataPoint.longitude}, ${dataPoint.latitude}, ${dataPoint.height})`,        position: position,        point: { pixelSize: 10, color: Cesium.Color.RED }      });    }    // STEP 6 CODE (airplane entity)    async function loadModel() {      // Load the glTF model from Cesium ion.      const airplaneUri = await Cesium.IonResource.fromAssetId(your_asset_id);      const airplaneEntity = viewer.entities.add({        availability: new Cesium.TimeIntervalCollection([ new Cesium.TimeInterval({ start: start, stop: stop }) ]),        position: positionProperty,        // Attach the 3D model instead of the green point.        model: { uri: airplaneUri },        // Automatically compute the orientation from the position.        orientation: new Cesium.VelocityOrientationProperty(positionProperty),            path: new Cesium.PathGraphics({ width: 3 })      });            viewer.trackedEntity = airplaneEntity;    }    loadModel();  </script></body></html>

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参考链接：

https://cesium.com/learn/cesiumjs-learn/cesiumjs-flight-tracker/

https://www.flightradar24.com/how-it-works

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Flightradar 24：实时追踪全球飞行航班

航班跟踪的工作原理

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