## 4 Experimental Results and Performance Analysis
### Comprehensive Performance Analysis  
Based on the well-designed experiments, the results below visually present the DAR comparison of PSSD and EPD algorithms under various interference conditions. The eLoran system adopts the CRC-RS cyclic check and error correction coding method, and a DAR of 90% becomes a key indicator for stable decoding of eLoran receivers. The black marks in Figure 10 present the SNRs under this indicator (\(-\)8.4 dB and \(-\)5.3 dB respectively). It is evident in an interference-free environment that the PSSD algorithm optimizes the SNR benchmark for successful decoding by 3.1 dB. Figure 11 presents the DAR comparisons of PSSD and EPD algorithm under different CWI conditions. Through this series of subfigures, we can systematically observe the change trends of DARs of the two algorithms as the number of CWIs increases. It highlights the significant anti-interference advantage of the new algorithm. Figures 10 and 11 cooperate with each other and jointly reveal the three primary trends:  
Figure 10: DAR comparison of PSSD and EPD algorithm without CWI. \begin{table}
\begin{tabular}{c c c c} \hline \hline \multirow{2}{*}{**SNR Range (dB)**} & \multicolumn{2}{c}{**DAR (\%)**} & \multirow{2}{*}{**Gain (\%)**} \\ \cline{2-3}  & **PSSD** & **EPD** & \\ \hline \(-\)20\(\sim\)\(-\)15 & 52.45 & 38.39 & 14.06 \\ \(-\)15\(\sim\)\(-\)10 & 74.18 & 56.31 & 17.87 \\ \(-\)10\(\sim\)\(-\)5 & 92.22 & 80.51 & 11.71 \\ \(-\)5\(-\)0 & 99.44 & 96.63 & 2.81 \\ \(0\)-5 & 100 & 99.92 & 0.08 \\ \(5\)\(\sim\)10 & 100 & 100 & 0 \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Average DAR (%) statistics of PSSD and EPD algorithm without CWI. Figure 11: DAR comparison of PSSD and EPD with: (a) 1 CWI; (b) 2 CWIs, (c) 3 CWIs; (d) 4 CWIs. \begin{table}
\begin{tabular}{c c c c} \hline \hline \multirow{2}{*}{**SNR Range (dB)**} & \multicolumn{2}{c}{**DAR (\%)**} & \multirow{2}{*}{**Gain (\%)**} \\ \cline{2-3}  & **PSSD** & **EPD** & \\ \hline \(-\)20\(\sim\)\(-\)15 & 50.73 & 37.93 & 12.80 \\ \(-\)15\(\sim\)\(-\)10 & 68.99 & 53.15 & 15.84 \\ \(-\)10\(\sim\)\(-\)5 & 82.76 & 71.43 & 11.33 \\ \(-\)5\(-\)0 & 89.59 & 82.46 & 7.13 \\ \(0\)-5 & 91.21 & 86.64 & 4.57 \\ \(5\)-10 & 91.34 & 87.92 & 3.42 \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Average DAR (%) statistics of PSSD and EPD algorithm with 1 CWI. According to the statistics in the table, we can clearly see the advantages of PSSD algorithm, and draw the following conclusions:  
1. Impact of SNR: The demodulation accuracy is positively correlated with SNR. Throughout the increase from \(-20\) dB to \(10\) dB, the PSSD algorithm consistently shows superior performance. 2. Analysis of the impact of CWI numbers: As the number of CWI increases, the DAR values gradually decrease. For instance, within the SNR range of \(-10\)\(\sim\)\(-5\) dB, the average DARs for different numbers of interferences are \(82.76\%\), \(79.59\%\), \(77.59\%\), and \(70.67\%\), respectively, showing a clear downward trend. This indicates that the presence of CWI negatively affects the demodulation process, with stronger interferences leading to greater negative impacts. 3. Advantage of PSSD algorithm in dealing with CWIs: The PSSD algorithm exhibits outstanding anti-interference capabilities when facing different levels of CWIs and can better maintain the demodulation performance. For instance, in the \(-10\)\(\sim\)\(-5\) dB interval, as the number of CWI increases from \(1\) to \(4\), the DAR differences between the PSSD and EPD algorithms are \(11.33\%\), \(10.11\%\), \(10.45\%\), and \(8.48\%\) respectively. This indicates that the unique technologies of PSSD, like truncated window sampling and spectral smoothing, play a crucial role in handling interference and make it outstanding in a complex interference environment. The analysis of figures and tables clearly shows that the proposed PSSD algorithm has significantly improved demodulation performance under various conditions, especially in low SNR and complex interference environments. This fully confirms its robustness and