## 2 Composition of the \"Target Situational Awareness\" Test System and Experimental Methods
### Carrier Aircraft and Pod Being Tested
#### 2.2.2 Design of the Communication Bus Interface  
In the experiments, the carrier flight interacted with the pod via buses to accomplish data transmission, as well as to send and receive control instructions referring to the downlink data sent by the carrier and uplink data sent by the missile. The data sent by the carrier to the pod via the 1553B bus included the following categories:  
1 Description of the carrier aircraft, including necessary carrier information, ID number, and code, which were sent to the pod. As shown in Table 1.  
2 Instructions of the carrier, which were sent to the pod, including simulated launch and pod preparation. As shown in Table 2.  
3 Mission parameters, including parameters of the carrier aircraft to be sent to the pod, such as carrying time, velocity X, velocity Y, velocity Z, pitch angle, heading angle,  
Figure 4: Vibration spectrum. Figure 5: Metallographic morphology of the transverse and longitudinal structure of the “T”-shaped structure. rolling angle, wind velocity X, wind velocity Y, wind velocity Z, latitude, longitude, and altitude. As shown in Table 3. \begin{table}
\begin{tabular}{c c c c c c} \hline
**No.** & **Item** & **Unit** & **Bit** & **Accuracy** & **Note** \\ \hline
1 & ID number & - & 16 & - & ASCII code \\
2 & Identification & - & 32 & - & ASCII code \\
3 & Pod hanging condition & - & 8 & - & 1: Hanging pod; 0: No pod \\ \hline \end{tabular}
\end{table} 
Table 1: Description of the carrier. \begin{table}
\begin{tabular}{c c c c c c} \hline
**No.** & **Item** & **Unit** & **Bit** & **Accuracy** & **Note** \\ \hline
1 & Carrier time 1 & & 16 & - & Year, month, day \\
2 & Carrier time 2 & us & 32 & - & Hour, minute, second \\
3 & Data frame counter & & 16 & 1 & For every frame of data sent to the \\
4 & Carrier velocity X & m/s & 16 & 0.025 & - \\
5 & Carrier velocity Y & m/s & 16 & 0.025 & - \\
6 & Carrier velocity Z & m/s & 16 & 0.025 & \\
7 & Carrier pitch angle & m/s & 16 & 0.0055 & \\
8 & Carrier heading angle & m/s & 16 & 0.0055 & - \\
9 & Carrier roll angle & m/s & 16 & 0.0055 & \\
10 & Wind velocity X & m/s & 16 & 0.025 & Northward wind velocity \\
11 & Wind velocity Y & m/s & 16 & 0.025 & Westward wind velocity \\
12 & Wind velocity Z & m/s & 16 & 0.025 & Skyward wind velocity \\
13 & Mach number & Ma & 16 & 0.0001 & Mach number of the carrier flight \\
14 & Carrier latitude & \({}^{\circ}\) & 32 & 8.381903 \(\times\) 10\({}^{-8}\) & 0: North latitude; 1: South latitude \\
15 & Carrier longitude & \({}^{\circ}\) & 32 & 8.381903 \(\times\) 10\({}^{-8}\) & 0: East longitude; 1: West longitude \\
16 & Carrier altitude & m & 16 & 1.28 & - \\ \hline \end{tabular}
\end{table} 
Table 3: Mission parameters. \begin{table}
\begin{tabular}{c c c c c c} \hline
**No.** & **Item** & **Unit** & **Bit** & **Accuracy** & **Note** \\ \hline
1 & Target information & & & & Year, month, day of the generation time \\  & generation time 1 & & & & \\ \hline
2 & Target information & & & & Hour, minute, second of the generation time \\  & generation time 2 & us & 32 & 40 & Hour, minute, second of the generation time \\ \hline
3 & Target latitude & \({}^{\circ}\) & 32 & 8.381903 \(\times\) 10\({}^{-8}\) & 0 in the sign bit signifies the north latitude; 1 \\  & & & & & the south latitude. \\ \hline
4 & Target longitude & \({}^{\circ}\) & 32 & 8.381903 \(\times\) 10\({}^{-8}\) & 0 in the sign bit signifies the east longitude; 1 \\  & & & & & the west longitude. \\ \hline
5 & Target altitude & m & 16 & 1.28 & - \\ \hline
6 & Target velocity X & m/s & 16 & 0.0512 & \\ \hline
7 & Target velocity Y & m/s & 16 & 0.0512 & - \\ \hline
8 & Target velocity Z & m/s & 16 & 0.0512 & \\ \hline \end{tabular}
\end{table} 
Table 4: Target parameters. Information Transmitted by the Pod  
1 Description of the pod, which was one-time valid information, including type, model number, and ID. As shown in Table 5.  
2 Pod responses, which were sent to the carrier aircraft to respond to its general instructions, including pod preparation status, simulated launch status, and self-check status.