cesium 模拟连线通信

var pointsInfo =
      {
        "s_id": "40905",
        "start": 1604937600000,
        "end": 1604938600000,
        "start_for_timeline": 1604937600000,
        "end_for_timeline": 1604938600000,
        "on_circle_milliseconds": 1000,
        "sat_locations_array": [{
          "a": 16.644356,
          "b": 16.906161,
          "c": 0
          //"c": 531947
        }, {
          "a": 5.961894,
          "b": 54.23244,
          "c": 0
          //"c": 540576
        }, {
          "a": -95.029766,
          "b": 82.126711,
          "c": 0
          //"c": 543170
        }]
      };


    var viewer = new Cesium.Viewer("cesiumContainer", {

      imageryProvider : new Cesium.UrlTemplateImageryProvider({
        url: "https://webst02.is.autonavi.com/appmaptile?style=6&x={x}&y={y}&z={z}",
      })
    });
   
    //去掉版权信息
    viewer._cesiumWidget._creditContainer.style.display = "none";

    var entity_sat = viewer.entities.add({
        // 将实体availability设置为与模拟时间相同的时间间隔。
        id:'111',
        position: Cesium.Cartesian3.fromDegrees(16.644356,16.906161,531947),//计算实体位置属性
        //基于位置移动自动计算方向.
        //orientation: new Cesium.VelocityOrientationProperty(entity1p),
        //加载飞机模型
         model: {
            //uri: 'weixin.gltf',
            uri: '/car/25car2.gltf',

            minimumPixelSize: 30
        },
        //路径
        path: {
            resolution: 1,
            material: new Cesium.PolylineGlowMaterialProperty({
                glowPower: 0.1,
                color: Cesium.Color.PINK
            }),
            width: 5
        }
    });

    var s_id = pointsInfo.s_id;
    var situation_time_start = pointsInfo.start;
    var situation_time_end = pointsInfo.end;

    // 下边两个时间用于控制时间轴日期显示
    var situation_time_start_for_timeline = pointsInfo.start_for_timeline;
    var situation_time_end_for_timeline = pointsInfo.end_for_timeline;

    // 卫星原始位置、卫星位置加上经度偏移
    var sat_locations_array = pointsInfo.sat_locations_array;

    var on_circle_milliseconds = pointsInfo.on_circle_milliseconds;

    // 起始时间（卫星可见）
    var start = Cesium.JulianDate.fromDate(new Date(situation_time_start));
    var stop = Cesium.JulianDate.fromDate(new Date(situation_time_end));

    entity_sat.time_orbit_start = start.clone();
    entity_sat.time_orbit_stop = stop.clone();

    // 起始时间（时间轴）
    var start_for_timeline = Cesium.JulianDate.fromDate(new Date(situation_time_start_for_timeline));
    var stop_for_timeline = Cesium.JulianDate.fromDate(new Date(situation_time_end_for_timeline));

    // 设置始时钟始时间
    viewer.clock.startTime = start_for_timeline.clone();

    // 设置始终停止时间
    view