Göktürk-1

Göktürk-1 is a high-resolution electro-optic Earth observation and reconnaissance satellite launched into space on 5 December 2016 from French Guiana, providing imagery intelligence for both military and civilian purposes. Its ability to acquire high-resolution images from any region on Earth without geographical limitations marked a significant milestone in Türkiye’s remote sensing and intelligence capabilities.

Development Process and Project Structure

The Göktürk-1 Satellite System was initiated under a contract signed on 13 July 2009 between the Presidency of Defence Industries of the Ministry of National Defence and Telespazio (TPZ S.p.A). Thales Alenia Space-France (TAS-F) served as the prime contractor for the satellite’s development, while Telespazio-Italy was responsible for the supply and integration of ground systems. TUSAŞ directly participated in multiple work packages of the project and manufactured several flight components. Additionally, under this project, the Satellite Assembly, Integration and Test (SAIT) Center was established in Türkiye, playing a critical role for future satellite programs.

Development and testing activities commenced on 19 July 2010. After detailed environmental and functional tests, the satellite was launched in 2016. Final acceptance was completed on 4 December 2018, and full operational control was transferred to the Air Forces Command.

Launch and Orbital Characteristics

Göktürk-1 was launched on 5 December 2016 at 16:51:44 UTC from Kourou, French Guiana, aboard a VEGA rocket operated by the European Space Agency. First contact with the satellite was established at 18:02:11 UTC, approximately 70 minutes after launch.

The satellite operates in a Sun-synchronous orbit at an altitude of approximately 681–700 km. It completes one orbit around Earth in about 98–100 minutes. The revisit time to image the same location again ranges between 2 and 3 days, depending on the pointing angle.

System Components

Satellite Platform

Göktürk-1 has a dry mass of approximately 1000–1070 kg and carries an electro-optical payload. It can capture images in five spectral bands:

• PAN (Panchromatic): 0.5 m resolution
• MS (Multispectral: Red, Green, Blue, Near-Infrared): 2 m resolution

The radiometric resolution is specified as 12-bit, with a ground sampling distance of less than 1 m. The system produces imagery at NIIRS Level 5 quality and provides high-precision geometric positioning capability.

The satellite has 192 GB of onboard data storage capacity, while ground stations have a storage capacity of 6 PBytes. It performs 14–15 orbital passes per day. Communication is conducted via X-Band (620 Mbps) and S-Band (1.6 Mbps).

Imaging Modes

Göktürk-1 is capable of acquiring images in four distinct modes:

1. Spot Mode: 15 km × 15 km image area
2. Strip Mode: 15 km wide swath, capturing up to 780 km in a single pass
3. Stereo Mode: Bidirectional imagery for 3D height and depth analysis
4. Wide Area Mode

The satellite has a daily maximum downlink capacity of 902 spot images.

Ground Systems

The Göktürk-1 system is supported by a Main Ground Station (Ahlatlıbel-GGS) and a Backup/Mobile Ground Station (MGS). The antenna tracking elevation angles are 50° for the GGS and 100° for the MGS. Mission command and control operations are conducted by the Reconnaissance Satellite Command under the Air Forces Command.

Design Life and Operations

The design life of Göktürk-1 is specified as 7 years, with plans indicating potential extension up to 7 years and 3 months. Post-launch operations, maintenance, repair, and engineering support are carried out by TUSAŞ.

Mission and Applications

Military Applications

Göktürk-1 was designed to meet the target intelligence requirements of the Turkish Armed Forces:

• It can acquire imagery from any location on Earth without geographical constraints.
• It contributes to target identification and precise mission planning in counter-terrorism operations.
• Together with Göktürk-2, it has significantly enhanced Türkiye’s space-based reconnaissance and observation capabilities.

Civilian Applications

The high-resolution imagery provided by the satellite is utilized in the following areas:

• Forest area monitoring
• Tracking illegal construction
• Rapid damage assessment during natural disasters
• Crop yield forecasting
• 3D city modeling and map production
• Maritime traffic and border security
• Environmental monitoring and disaster management

Position within Türkiye’s Satellite Fleet

Göktürk-1, together with the active Earth observation satellites Göktürk-2 and İMECE, forms a fundamental component of Türkiye’s remote sensing capacity. The system, which provides over 60,000 images annually, plays a critical role in national data production.