The nonideal characteristics of the entire channel of satellite navigation signals from generation, propagation to reception will cause signal distortions, resulting in pseudorange biases. Such kind of biases cannot be eliminated by differential technologies and has become a core error source in high-accuracy applications. We study the theoretical model and implementation method of a pseudorange-bias-free linear channel. The ideal channel transfer function equation under the unbiased pseudorange requirement is first derived from the equivalent baseband model. Based on two corresponding criteria and the simulation of the influence of different amplitude- and phase-frequency responses, a digital phase compensation method based on an all-pass filter is proposed to eliminate pseudorange biases. Then the significant effects of the two phase equalizers are validated by a simulation example of the BPSK(10) signal. Finally, the real BDS3 PRN32 and PRN33 satellite B1C signals collected by a 40-m high-gain dish antenna are utilized to invert the channel transfer characteristics and processed by our software receiver. The measurement results demonstrate that the phase equalizers constructed according to either the linear phase criterion or the linear phase plus even-symmetric phase criterion can effectively reduce the pseudorange bias. The model and method provide a reference for payload and receiver optimization and are suitable for various signal structures and applications.

从产生，传播到接收的整个卫星导航信号通道的非理想特性都会导致信号失真，从而导致伪距偏差。此类偏差无法通过差分技术消除，已成为高精度应用中的核心误差源。我们研究了无伪距偏置线性通道的理论模型和实现方法。首先从等效基带模型中得出无偏伪距要求下的理想信道传递函数方程。基于两个相对应的判据，并通过模拟不同幅度和相位频率响应的影响，提出了一种基于全通滤波器的数字相位补偿方法，以消除伪距偏差。然后，通过BPSK（10）信号的仿真示例验证了两个相位均衡器的显着效果。最后，由40米高增益碟形天线收集的真实BDS3 PRN32和PRN33卫星B1C信号被用于反转信道传输特性，并由我们的软件接收器进行处理。测量结果表明，根据线性相位准则或线性相位加偶数对称相位准则构造的相位均衡器可以有效降低伪距偏置。该模型和方法为有效载荷和接收机优化提供了参考，并且适用于各种信号结构和应用。由40米高增益碟形天线收集的真实BDS3 PRN32和PRN33卫星B1C信号用于反转信道传输特性，并由我们的软件接收器进行处理。测量结果表明，根据线性相位准则或线性相位加偶数对称相位准则构造的相位均衡器可以有效降低伪距偏置。该模型和方法为有效载荷和接收机优化提供了参考，并且适用于各种信号结构和应用。由40米高增益碟形天线收集的真实BDS3 PRN32和PRN33卫星B1C信号用于反转信道传输特性，并由我们的软件接收器进行处理。测量结果表明，根据线性相位准则或线性相位加偶数对称相位准则构造的相位均衡器可以有效降低伪距偏置。该模型和方法为有效载荷和接收机优化提供了参考，并且适用于各种信号结构和应用。测量结果表明，根据线性相位准则或线性相位加偶数对称相位准则构造的相位均衡器可以有效降低伪距偏置。该模型和方法为有效载荷和接收机优化提供了参考，并且适用于各种信号结构和应用。测量结果表明，根据线性相位准则或线性相位加偶数对称相位准则构造的相位均衡器可以有效降低伪距偏置。该模型和方法为有效载荷和接收机优化提供了参考，并且适用于各种信号结构和应用。