It appears you are referring to the **CSS-7** (the NATO reporting name for the Chinese **DF-11** or Dongfeng-11), which is a short-range ballistic missile (SRBM). The electronic systems of the CSS-7 are critical for its guidance, stability, and detonation. Below is a breakdown of its primary electronic components. --- ### Core Electronic Components of the CSS-7 (DF-11) | Component Category | Electronic Parts | Function | | :--- | :--- | :--- | | **Guidance System** | Inertial Guidance System (IGS) | Uses accelerometers and gyroscopes to calculate position without external signals. | | **Control System** | On-board Computer (OBC) | Processes sensor data and sends commands to the flight actuators. | | **Navigation Update** | GPS/Beidou Receivers | Modern variants (DF-11A) use satellite signals to correct inertial drift. | | **Flight Control** | Servo-Actuators & Controllers | Electronic motors that move the four clipped-delta fins for steering. | | **Power Supply** | Thermal Batteries | Provide high-density, reliable electrical power during the short flight duration. | ### Technical Breakdown #### 1. Inertial Measurement Unit (IMU) The "brain" of the missile's electronics is the IMU. In the original CSS-7, this consisted of mechanical gyroscopes. Upgraded versions utilize **Ring Laser Gyros (RLGs)** or **Fiber Optic Gyros (FOGs)**. These electronics detect changes in pitch, roll, and yaw to keep the missile on its pre-programmed ballistic trajectory. #### 2. On-board Processing The electronics include a hardened microprocessor designed to withstand high G-forces and vibration. This computer: * Calculates the "Time-to-Go" for engine cutoff. * Manages the transition from the boost phase to the terminal phase. * Coordinates the separation of the warhead from the missile body (in certain variants). #### 3. Terminal Guidance (Advanced Variants) The CSS-7 Mod 2 (DF-11A) incorporates an optical or radar correlation system in the nose cone. This electronic sensor takes "pictures" of the terrain and compares them to stored digital maps to achieve a Circular Error Probable (CEP) of less than 30-50 meters. #### 4. Electronic Fusing The warhead utilizes an **Electronic Safety and Arming Device (ESAD)**. This ensures the missile does not detonate prematurely and uses radar altimeters or impact sensors to trigger the explosion at the optimal height for maximum damage. ---