The **RBS-15 Gungnir (specifically the Mk3 and Mk4 variants, often associated with the "R" designation for land-based or upgraded configurations)** is a long-range anti-ship missile system developed by Saab Bofors Dynamics. The electronic architecture of the RBS-15 is designed for high autonomy, resistance to electronic warfare (EW), and precise terminal guidance. --- ### Core Electronic Components | Component | Description | Function | | :--- | :--- | :--- | | **Active Radar Seeker** | J-band (Ku-band) monopulse radar | Provides terminal guidance and target discrimination in all weather conditions. | | **Inertial Navigation (INS)** | Laser gyro-based inertial unit | Tracks the missile's position and orientation without external signals. | | **GPS Receiver** | Anti-jam satellite navigation | Supplements the INS for long-range mid-course accuracy. | | **Radar Altimeter** | High-precision FMCW radar | Enables "Sea-Skimming" (flying just meters above waves) to avoid detection. | | **Flight Control Computer** | High-speed digital processor | Manages flight logic, trajectory, and evasive maneuvers. | --- ### Electronic Subsystem Details #### 1. Guidance and Navigation System The electronics in the RBS-15 allow for a "fire-and-forget" capability. * **Mid-course Phase:** The missile uses a combination of **INS and GPS**. If the GPS signal is jammed, the electronics switch to pure inertial navigation. * **Terminal Phase:** The seeker activates at a pre-programmed point. Modern versions feature **ECCM (Electronic Counter-Countermeasures)** electronics that can distinguish between real ship targets and enemy chaff or active decoys. #### 2. Propulsion Control (ELEC) The missile is powered by a **Microturbo TR 60-5 turbojet**. The electronic engine control unit (ECU) manages fuel flow and thrust to optimize range and speed during different flight phases (boost vs. cruise). #### 3. Power Supply System * **Thermal Batteries:** High-reliability batteries that provide instant electrical power upon launch. * **DC/AC Converters:** Necessary to power the high-frequency radar components and the digital logic boards. #### 4. Communication Link (Mk4/Gungnir) The latest iterations include a **Two-Way Data Link**. This allows the missile to: * Receive target updates in flight. * Transmit health status and "Kill Assessment" data back to the launch platform. --- ### Comparison of Electronic Features | Feature | RBS-15 Mk2/Mk3 | RBS-15 Mk4 (Gungnir) | | :--- | :--- | :--- | | **Processor Type** | Legacy Integrated Circuits | Advanced High-Speed FPGA/SoC | | **Seeker** | Standard Radar | Enhanced Digital Radar + IR potential | | **Data Link** | None / Limited | Full Two-Way Link | | **Electronic Protection**| Basic ECCM | Advanced AI-driven ECCM |