def parse_constellation_from_lla(): lla_data_filename = data_folder_path + constellation_name + '-Current-Constellation-LLA.txt'; satellite_trace_grouped_by_time = {}; months = sp_utils.sp_month_map(); id = 0; with open(lla_data_filename, errors='ignore') as file: lla_data_list = []; lla_data_per_satellite_list = []; for line in file: # LLA location data of each satellite starts with a line with "Time (UTCG)" if ("Time (UTCG)" in line): # save LLA data already parsed, and start a new list for next satellite if (len(lla_data_per_satellite_list)): print("Save %s samples for satellite %s" % (str(len(lla_data_per_satellite_list)), str(id))); lla_data_list.append(copy.deepcopy(lla_data_per_satellite_list)); write_satellite_lla_to_csv(lla_data_per_satellite_list, id); lla_data_per_satellite_list.clear(); id = id + 1; continue; # Time (UTCG) Lat (deg) Lon (deg) Alt (km) Lat Rate (deg/sec) Lon Rate (deg/sec) Alt Rate (km/sec) # 7 Jul 2020 19:00:00.000 -52.162 166.811 570.070856 -0.013114 0.095196 0.005696 line = line.split(); if (len(line) == 10): sample = sp_lla_trace(); sample.time = line[2] + "-" + str(months[line[1]]) + "-" + line[0] + "-" + line[3] sample.time = sample.time.replace(":", "-"); sample.time = sample.time.replace(".000", ""); sample.latitude = line[4]; sample.longitude = line[5]; sample.attitude = line[6]; sample.id = id; lla_data_per_satellite_list.append(copy.deepcopy(sample)); # append satellite LLA location to a certain time slot. if (sample.time not in satellite_trace_grouped_by_time.keys()): satellite_trace_grouped_by_time[sample.time] = []; satellite_trace_grouped_by_time[sample.time].append(copy.deepcopy(sample)); # save the last satellite. if (len(lla_data_per_satellite_list)): print("Save %s samples in for satellite %s" % (str(len(lla_data_per_satellite_list)), str(id))); lla_data_list.append(copy.deepcopy(lla_data_per_satellite_list)); write_satellite_lla_to_csv(lla_data_per_satellite_list, id); lla_data_per_satellite_list.clear(); print("Extract LLA location of %s satellites in total." % str(id)); # save LLA location trace grouped by time slots all_time_slots = satellite_trace_grouped_by_time.keys(); print("Save LLA location by time slot."); for time_slot in all_time_slots: write_satellite_lla_by_time(time_slot, satellite_trace_grouped_by_time[time_slot]); print("Saving LLA location in %s." % time_slot); print("LLA location saved to files.");

这段代码是在解析卫星轨迹的经纬度和高度数据。首先会根据数据文件的路径和星座名称生成文件名，然后将卫星轨迹按时间分组。代码中使用了一个月份的映射表，同时设定一个id。之后通过打开LLA数据文件（忽略错误），将读取的数据存入列表中。代码中还有一个卫星轨迹列表，并逐行读取文件中数据作为每个卫星的轨迹。