Diponegoro-class (Sigma 9113)

The Diponegoro class consists of four guided-missile corvettes operated by the Indonesian Navy. Based on the Netherlands-designed SIGMA 9113 modular vessel family, the class succeeded the Fatahillah and Dewantara designs. Damen Schelde Naval Shipbuilding constructed the vessels between 2005 and 2008 at the Vlissingen-Oost yard. The lead ship, KRI Diponegoro, began construction in October 2004 and entered service in July 2007. Subsequent units include Sultan Hasanuddin, Sultan Iskandar Muda, and Frans Kaisiepo, all commissioned by March 2009.

The design employs a modular structure configured for multi-purpose roles. Propulsion is provided by SEMT Pielstick diesel engines driving five-bladed controllable pitch propellers via a steel-composite coupling combination. The class utilizes passive roll stabilization for sea-keeping. Sensor and processing suites include the TACTICOS combat management system, multibeam surveillance radar, fire control tracking radar, and medium frequency active/passive hull-mounted sonar. Internal and external communications are managed through fiber optic networks and integrated satellite communication systems. Electronic warfare capabilities comprise electronic support measures, electronic countermeasures, and decoy launchers. Aviation facilities consist of a landing pad with an optional hangar. Primary armament includes anti-surface missiles, anti-air missiles, a main gun, and torpedo launchers.

Operational history includes the deployment of various missile systems. While export licensing for anti-ship missiles was reviewed in 2007 with Chinese alternatives considered, the vessels entered service with the Exocet system. KRI Sultan Iskandar Muda conducted a launch of the Block III variant in 2019. In November 2022, a modernization contract was signed between PT Len and Thales Nederland to refurbish the integrated mission systems across the class. This program includes the installation of the TACTICOS Baseline 2 combat management system and software-driven radar technology.