Designing a system architecture involves specifying the structure of the system, including its components, their interactions, and the flow of data between them.  Representation a basic CubeSat mission system architecture  is given in Python code.

• The CubeSatMission class represents the overall CubeSat mission.

• Subsystems such as CubeSatPayload, PowerSystem, CommunicationSystem, and OrbitControlSystem represent different aspects of the mission.

• The CubeSatMission class has methods to set the parameters for each subsystem and an execute_mission method to execute the mission. 

Linking system-level requirements to components in the architecture involves establishing connections between the high-level requirements and the specific components that will fulfill those requirements. Example is given for the same. 

Capturing High-resolution imaging data

Generating power (Average: 2.5 W, Peak: 5.0 W)

Transmitting data (Data rate: 1 Mbps, Frequency band: UHF)

Adjusting orbit (Altitude: 500 km, Inclination: 45 deg, Orbital Period: 90 min)

Modeling vehicle dynamics and flight control systems is a complex task that involves understanding the physics of the vehicle's motion and designing control algorithms to achieve desired behavior. The choice of modeling approach depends on the specific characteristics of the vehicle (e.g., aircraft, drone, car) and the level of detail required.

Let's consider a simple example of modeling the dynamics of a quadcopter (drone) and implementing a basic flight control system using Python. This example will use the control library for control system analysis and design. 

Validating orbital requirements typically involves performing mission analysis, which includes calculations related to orbital dynamics, such as orbit altitude, inclination, period, and other relevant parameters. Python provides various tools and libraries that can be useful for performing these calculations.