Compared with the traditional GPS L1 C/A signal, the existing and emerging new-generation wideband GNSS signals suffer more severe distortions due to the nonlinear characteristics of a high-power amplifier (HPA) in the satellite transmitter. HPA nonlinearity can lead to in-band signal distortion and out-of-band spectral regrowth, which degrade the ranging performance of a GNSS receiver. Researchers have reported power loss, correlation peak asymmetries, lock point bias as well as carrier tracking error caused by the HPA nonlinearity. However, few pre-distortion approaches that compensate for the HPA nonlinear effects have been presented in the GNSS field. We first take BDS-3 B2 asymmetric constant envelope binary offset carrier signal as an example to present the HPA nonlinear effects on wideband GNSS signals. Then, the design principle of a predistorter is investigated, and a Hammerstein predistorter is proposed to eliminate the nonlinear HPA with memory. Finally, we compare the constellation diagram, power spectrum, correlation function, code tracking bias with and without the Hammerstein predistorter. The comparison results demonstrate that a digital predistorter is a potential solution to compensate the HPA nonlinear distortions for wideband GNSS signals. This pre-distortion approach is of great significance that can effectively guarantee the nominal signal quality in space not only during the maintenance of the current GNSSs but also for the future emerging local or global navigation systems.

与传统的GPS L1 C / A信号相比，由于卫星发射器中高功率放大器（HPA）的非线性特性，现有和新兴的新一代宽带GNSS信号遭受更严重的失真。HPA非线性会导致带内信号失真和带外频谱再生长，从而降低GNSS接收机的测距性能。研究人员报告了功率损耗，相关峰不对称，锁定点偏差以及由HPA非线性引起的载波跟踪误差。但是，在GNSS领域中，很少有能补偿HPA非线性影响的预失真方法。我们首先以BDS-3 B2非对称恒定包络二进制偏移载波信号为例，介绍HPA对宽带GNSS信号的非线性影响。然后，研究了预失真器的设计原理，提出了Hammerstein预失真器，以消除具有记忆的非线性HPA。最后，我们比较了有无Hammerstein预失真器的星座图，功率谱，相关函数，代码跟踪偏差。比较结果表明，数字预失真器是补偿宽带GNSS信号的HPA非线性失真的潜在解决方案。这种预失真方法具有重要意义，不仅可以在维护当前GNSS的过程中，而且可以为未来出现的本地或全球导航系统有效地保证空间中的标称信号质量。功率谱，相关函数，带有和不带有Hammerstein预失真器的代码跟踪偏差。比较结果表明，数字预失真器是补偿宽带GNSS信号的HPA非线性失真的潜在解决方案。这种预失真方法具有重要意义，不仅可以在维护当前GNSS的过程中，而且可以为未来出现的本地或全球导航系统有效地保证空间中的标称信号质量。功率谱，相关函数，带有和不带有Hammerstein预失真器的代码跟踪偏差。比较结果表明，数字预失真器是补偿宽带GNSS信号的HPA非线性失真的潜在解决方案。这种预失真方法具有重要意义，不仅可以在维护当前GNSS的过程中，而且可以为未来出现的本地或全球导航系统有效地保证空间中的标称信号质量。