The positioning technique employing the ubiquitous signals of opportunity of non-cooperative satellites does not send special navigation signals, instead it passively receives satellite signals as noise, presenting advantages of concealment and difficulty for potential attackers. Thus, this study investigates the ranging principle and model using non-cooperative communication satellites and a time difference estimation algorithm. The technology of time difference measurement under non-cooperative observation mode was determined and simulated. A test platform for time difference measurement was built to receive the signal from an unknown geostationary Earth orbit communication satellite and verify the ranging feasibility and performance. The ranging accuracy was found to be smaller than 6 m, as demonstrated by experimental data, which shows the viability of the proposed positioning technique for ranging technology.

中文翻译：

---

利用非合作通信卫星机会信号的测距技术

利用非合作卫星无处不在的机会信号的定位技术不发送特殊的导航信号，而是被动地接收卫星信号作为噪声，具有隐蔽性好、不易被潜在攻击者攻击的优点。因此，本研究使用非合作通信卫星和时差估计算法研究测距原理和模型。确定并模拟了非合作观测模式下的时差测量技术。搭建时差测量测试平台，接收未知地球静止轨道通信卫星信号，验证测距可行性和性能。如实验数据所示，测距精度小于 6 m，