假设您已经有了认证API请求的凭据：
1.选择一个HTTP客户端库，如python中的请求
1.发出API请求：
SATCAT API：SATCAT API允许您检索有关卫星目录数据的信息。要获取SATCAT数据，请使用所需参数构造API请求URL，并向API端点发送HTTP GET请求。例如，要获取由其国际指示符（INTDES）标识的特定卫星的详细信息，您可以发出以下请求：

requests.get(https://www.space-track.org/basicspacedata/query/class/satcat/INTDES/{satellite_intdes}/orderby/SATNAME/format/json)

将{satellite_intdes}替换为要获取的卫星的实际国际指示符。
TLE API：TLE（Two-Line Elements）API允许您检索TLE格式的卫星轨道数据。要获取TLE数据，请使用所需参数构造API请求URL，并向API端点发出HTTP GET请求。例如，要获取由NORAD目录号标识的特定卫星的最新TLE数据，您可以发出以下请求：

requests.get(https://www.space-track.org/basicspacedata/query/class/tle_latest/NORAD_CAT_ID/{norad_cat_id}/orderby/EPOCH desc/limit/1/format/tle)

将{norad_cat_id}替换为要获取的卫星的实际NORAD目录号。
1.处理API响应：收到API响应后，您可以根据提供的格式（例如JSON或TLE）解析和处理数据。您可以从响应中提取所需信息，并根据需要在发票应用程序中使用。
下面是一个如何使用Python和requests库从Space-Track API获取数据的示例

import requests

# API credentials
username = "your_username"
password = "your_password"

# Base URL for Space-Track API
base_url = "https://www.space-track.org"

# SATCAT API endpoint
satcat_endpoint = "/basicspacedata/query/class/satcat/INTDES/{satellite_intdes}/orderby/SATNAME/format/json"

# TLE API endpoint
tle_endpoint = "/basicspacedata/query/class/tle_latest/NORAD_CAT_ID/{norad_cat_id}/orderby/EPOCH desc/limit/1/format/tle"

# Function to fetch SATCAT data
def fetch_satcat_data(satellite_intdes):
    # Construct the API request URL
    url = base_url + satcat_endpoint.replace("{satellite_intdes}", satellite_intdes)

    # Send GET request with authentication
    response = requests.get(url, auth=(username, password))

    # Check if the request was successful
    if response.status_code == 200:
        data = response.json()
        # Process the data as needed
        return data
    else:
        print("Failed to fetch SATCAT data. Status code:", response.status_code)
        return None

# Function to fetch TLE data
def fetch_tle_data(norad_cat_id):
    # Construct the API request URL
    url = base_url + tle_endpoint.replace("{norad_cat_id}", norad_cat_id)

    # Send GET request with authentication
    response = requests.get(url, auth=(username, password))

    # Check if the request was successful
    if response.status_code == 200:
        data = response.text
        # Process the data as needed
        return data
    else:
        print("Failed to fetch TLE data. Status code:", response.status_code)
        return None

# Example usage
satellite_intdes = "ISS"
satcat_data = fetch_satcat_data(satellite_intdes)
if satcat_data:
    print("SATCAT data for", satellite_intdes, ":", satcat_data)

norad_cat_id = "25544"
tle_data = fetch_tle_data(norad_cat_id)
if tle_data:
    print("TLE data for NORAD ID", norad_cat_id, ":", tle_data)

以下是该主题的完整指南：https://nbntechstreet.com/2023/06/13/fetching-space-data-with-python-a-guide-to-using-the-space-track-api/