Fig. 1. The real form of trapezoidal plume

Fig. 2. The real form of cone plume

Fig. 3. The simulation model of trapezoidal plume

Fig. 4. The simulation model of cone plume

Fig. 5. The projection shape under different detection angles φ

Fig. 6. The emissivity of the plume

Fig. 7. SNCR of B2 at a flying height of 15 km,（a） medium wave 3~5 μm high cumulus cloud background SNCR,（b）medium wave 3~5 μm standard cirrus background SNCR,（c） long wave 8~12 μm high cumulus cloud SNCR in the background,（d）SNCR in the background of long-wave 8~12 μm standard cirrus clouds

Fig. 8. SNCR of F15 at a flying height of 15 km,（a）medium wave 3~5 μm high cumulus cloud background SNCR,（b）medium wave 3~5 μm standard cirrus background SNCR,（c）long wave 8~12 μm high cumulus cloud SNCR in the background, （d）SNCR in the background of long-wave 8~12 μm standard cirrus clouds

Fig. 9. SNCR value of Boeing at a flying height of 15 km, （a） SNCR in the background of 3~5 μm high cumulus cloud in medium wave,（b）SNCR in the background of 3~5 μm standard cirrus cloud in medium wave,（c）Long wave 8~12 μm high cumulus cloud SNCR in the background,（d）SNCR in the background of long-wave 8~12 μm standard cirrus clouds

Fig. 10. SNCR value of Boeing at a flying height of 5 km, （a）SNCR in the background of 3~5 μm high cumulus clouds in medium wave,（b）SNCR in the background of 3~5 μm standard cirrus in medium wave,（c）Long wave 8~12 μm high cumulus cloud SNCR in the background,（d）SNCR in the background of long-wave 8~12 μm standard cirrus clouds

Table 1. 三类目标基本参数

Table 2. 尾焰参数

Table 3. 探测系统相关参数

Table 4. 飞机各部分在不同波段的辐射强度

Table 5. 三类飞机目标在不同背景下的SNCR峰值波段、波段间隔和峰值SNCR、SNR和SCR值