Function get_orbit_tracks

backend/api.py:1424–1492

返回所有 LEO/MEO 卫星在当前时刻起的一个轨道周期内的位置采样点。 用于前端在 Cesium 中绘制空间轨道折线与地面星下点轨迹。 查询参数： - steps (int): 每颗卫星的采样点数量，范围 [20, 360]，默认 90。 返回格式： { "time": <仿真时刻>, "tracks": [ { "id": "LEO-001", "type": "LEO", "orbit_period": 5760

()

@app.route('/api/orbit_tracks')
def get_orbit_tracks():
    """返回所有 LEO/MEO 卫星在当前时刻起的一个轨道周期内的位置采样点。

    用于前端在 Cesium 中绘制空间轨道折线与地面星下点轨迹。

    查询参数：
      - steps (int): 每颗卫星的采样点数量，范围 [20, 360]，默认 90。

    返回格式：
      {
        "time": <仿真时刻>,
        "tracks": [
          {
            "id": "LEO-001",
            "type": "LEO",
            "orbit_period": 5760.0,
            "orbit_points": [{"lat": ..., "lon": ..., "alt": ...}, ...],
            "ground_points": [{"lat": ..., "lon": ..., "alt": 0}, ...]
          },
          ...
        ]
      }
    """
    try:
        raw_steps = request.args.get('steps', '90')
        try:
            steps = int(raw_steps)
        except (ValueError, TypeError):
            steps = 90
        steps = max(20, min(360, steps))

        with simulation_engine.lock:
            current_time = simulation_engine.current_time
            leo_sats = list(simulation_engine.leo_satellites)
            meo_sats = list(simulation_engine.meo_satellites)

        tracks = []
        all_sats = [(sat, 'LEO') for sat in leo_sats] + [(sat, 'MEO') for sat in meo_sats]

        for sat, sat_type in all_sats:
            period = sat.get_orbital_period()
            dt = period / steps

            orbit_points = []
            ground_points = []
            for i in range(steps):
                t = current_time + i * dt
                lat, lon, alt = sat.propagate(t)
                orbit_points.append({'lat': round(lat, 4), 'lon': round(lon, 4), 'alt': round(alt, 0)})
                ground_points.append({'lat': round(lat, 4), 'lon': round(lon, 4), 'alt': 0})

            # 闭合轨道：加入起始点
            if orbit_points:
                orbit_points.append(orbit_points[0])
                ground_points.append(ground_points[0])

            tracks.append({
                'id': sat.sat_id,