Understanding ISRO Satellites for Defence Communication

The question asks about a specific satellite launched by ISRO in 2018 aimed at improving the communication abilities of the armed forces. Let's look at the options provided and their roles.

• Cartosat-2: This series of satellites is primarily used for earth observation, providing high-resolution images for various purposes including mapping, urban planning, and coastal land use regulation. While useful, its main function is not communication for the armed forces.
• EMISAT: Launched in 2019, EMISAT is an electronic intelligence satellite designed to measure the electromagnetic spectrum. Its role is related to surveillance and intelligence, not primarily communication.
• GSAT-7A: This satellite, launched in December 2018, is a geostationary communication satellite specifically designed to provide communication services to the Indian Air Force (IAF). It enhances network-centric warfare capabilities and improves communication links between ground radar stations, airbases, and aircraft. This aligns directly with the description of boosting armed forces' communication.
• GSAT-29: Also launched in November 2018, GSAT-29 is a high-throughput communication satellite primarily intended to provide high-speed internet connectivity to remote areas in Jammu and Kashmir and North-Eastern regions of India. While a communication satellite, its primary focus is civilian connectivity, not specific defence communication links for the armed forces like GSAT-7A.

Based on the function and the launch year (2018), the satellite specifically designed to boost the armed forces' communication capabilities is GSAT-7A.

Detailed Analysis of GSAT-7A

GSAT-7A is a advanced communication satellite built by the Indian Space Research Organisation (ISRO). Key details include:

• Launch Date: December 19, 2018
• Launch Vehicle: GSLV-F11
• Orbit: Geostationary orbit
• Primary User: Indian Air Force (IAF)
• Purpose: To provide secure communication links, enhance network-centric operations, and connect various airborne and ground assets.

This satellite is often referred to as the "Angry Bird" satellite due to its military application, similar to its predecessor GSAT-7 (Rukmini) which serves the Indian Navy.

Comparison of 2018 ISRO Communication Satellites

ISRO had a busy year in 2018 with several launches. Focusing on communication satellites launched that year:

This table clearly shows that GSAT-7A is the satellite launched in 2018 specifically for the armed forces' communication needs.

Revision Table: Key ISRO Satellites

Additional Information: ISRO's Role in Defence

ISRO plays a crucial role in supporting India's defence capabilities through various types of satellites:

• Communication Satellites: Like GSAT-7 and GSAT-7A, providing secure and robust communication links for the Army, Navy, and Air Force.
• Earth Observation Satellites: Like the Cartosat series and RISAT (Radar Imaging Satellite) series, providing high-resolution imagery for surveillance, mapping, and strategic planning.
• Navigation Satellites: The NavIC system provides accurate positioning and timing information, which is vital for defence operations.

These satellites enhance situational awareness, improve command and control, and enable network-centric operations for the Indian armed forces.