import pyproj
import pandas as pd

"""
    input:
        ecef_file:输入文件路径
            format: 0:tow
                    1:ecef_x
                    2:ecef_y
                    3:ecef_z
    output:
        ouputpath:输出文件路径
            format: 0:tow
                    1:lat
                    2:lon
"""

ecef_file = "/Users/wakanda_shaw/Library/Mobile Documents/com~apple~CloudDocs/GNSS文献/LG69T/2022630/630_3/PVT.csv"
output_path = "./llh.csv"

ecef = pd.read_csv(ecef_file)

transformer = pyproj.Transformer.from_crs(
    {"proj":'geocent', "ellps":'WGS84', "datum":'WGS84'},
    {"proj":'latlong', "ellps":'WGS84', "datum":'WGS84'},
    )

lat = []
lon = []
tow = []

for i in range(len(ecef)):
    x = ecef.iloc[i,1]
    y = ecef.iloc[i,2]
    z = ecef.iloc[i,3]
    time = ecef.iloc[i,0]
    lon1, lat1, alt1 = transformer.transform(x,y,z,radians=False)
    lat.append(lat1)
    lon.append(lon1)
    tow.append(time)

csv = pd.DataFrame([tow,lat,lon]).T
csv.to_csv(output_path,index=None,header=False,float_format='%.10f')