In the Global Navigation Satellite System (GNSS) L5/E5a interference environment, RTCA DO‐292 proposes a model to compute the degradation due to the presence of interference signals, such as Distance Measuring Equipment/TACtical Air Navigation (DME/TACAN), Joint Tactical Information Distribution System/Multifunctional Information Distribution System (JTIDS/MIDS), etc., and due to the application of a temporal blanker to mitigate their impact. The degradation is modeled as a function of the blanker duty cycle, , and the equivalent noise‐level contribution of the non‐blanked interference, However, in RTCA DO‐292, the computation of these two terms has a reduced accuracy since a general statistical model of signal pulse collisions and an overbounded flat post‐blanker pulsed interference signal Power Spectrum Density (PSD) are assumed. In this paper, the limitations of the applied pulse collisions mathematical model are commented, and the use of true post‐blanker pulsed interference signal PSD is introduced through the application of the spectral separation coefficient. As a result, more accurate new formulas for and degradation are derived. The new formulas are verified through simulations for DME/TACAN signals.

中文翻译：

---

存在连续波和脉冲干扰的GNSS退化模型

在全球导航卫星系统（GNSS）L5 / E5a干扰环境中，RTCA DO‐292提出了一个模型来计算由于存在干扰信号而引起的降级，例如测距设备/空中航行（DME / TACAN），联合战术信息分发系统/多功能信息分发系统（JTIDS / MIDS）等，并且由于应用了临时消隐器以减轻其影响。该降解模拟为熄灭占空比的功能，以及非消隐干扰等效噪声级贡献，但是，在RTCA DO‐292中，这两个术语的计算精度有所降低，因为假定了信号脉冲冲突的一般统计模型和过大的平坦后置空白脉冲干扰信号功率谱密度（PSD）。在本文中，对所应用的脉冲碰撞数学模型的局限性进行了评述，并通过应用频谱分离系数，介绍了真正的后置空白脉冲干扰信号PSD的使用。结果，得出了更精确的新公式和降级公式。通过对DME / TACAN信号的仿真验证了新公式。