A more indepth article about various radars in development by Aselsan:
The First STR Produced by ASELSAN Entered the Land Forces Command Inventory!
The Ministry of National Defense announced that the inspection and acceptance procedures of the first of the Weapon Detection Radars that will be included in the inventory of the Land Forces Command have been completed, with a post on its social media account on 10 December 2021, and added: "The Weapon Detection Radar (STR), developed by ASELSAN with national means, be beneficial to our Turkish Armed Forces! ”
December 11, 2021
ASELSAN exhibited scale models of Weapon Detection Radar (STR), Early Warning Radar System (EIRS) and Low Altitude Radar System (AIRS) and solutions developed for Land and Air Force Commands at its indoor stand during IDEF '21 Fair. An ASELSAN official I spoke to at the fair stated that the first STR System was subjected to fire tests before the Fair, within the scope of acceptance tests, and that the first System was planned to enter KKK service by the end of 2021.
The first AIRS is planned to be delivered to HvKK in 2022. The receiver algorithm will be corrected with the data collected after the two-month acceptance test process of the Early Warning Radar System (EIRS), which is stated to have been tested at a high position in Ankara as of August. The information I got at the fair was that the first EIRS would be delivered to HvKK in October 2021. However, the President of the Defense Industry Prof. Dr. İsmail DEMİR, in his speech at the opening ceremony held on October 5, 2021 within the scope of the 3rd Military Radar and Border Security Summit, said, “We are planning to make the first delivery of our Early Warning Radar System to our Air Force Command next month (November 2021). In addition, we will take the first product of the Low Altitude Radar System (AIRS) Project, the new product of the EIRS Radar Family, into the inventory next year. We plan to increase the number of our national radar systems, which will significantly increase the capabilities of our security forces, in the coming years.” However, as of 11 December 2021, no information regarding the delivery in question has been disclosed to the public. ASELSAN will deliver a total of 9 STRs, 5 S-Band AİRS and 4 EİRS (it is expected to reach 22 units in fixed and portable configurations in total) under existing contracts.
The antenna units of the radars that will operate in the S-Band frequency band have a locally designed and produced GaN-based Transmit/Receive (T/R) module expressed by hundreds. EIRS, STR, AIRS and Multi-Function Fire Control Radar, which is expected to be delivered in 2022, has a two-axis AESA structure. Thanks to the fact that each radiation element in the antenna has a separate phase shifter, this type of radars can perform electronic beam orientation/phase shift both horizontally (sideways) and vertically (elevation). ÇAFRAD and CENK-S also have two axes in AESA structure.
A Look at the STR System
A Weapon Detection Radar Project Contract was signed between the Ministry of National Defense and Aselsan on 16 December 2016 in order to meet the need for a new generation STR with longer range, which will support the two C-Band Cobra Weapon Detection Radar (STR) in the inventory and replace it in time, with national means. The hardware building blocks of the EIRS Project were used in the STR, which was developed under a contract worth US$176,850 Million. Under the contract, not only will STR be developed, but also a certain number of radars will be produced and delivered to the KKK. ASELSAN Weapon Detection Radar, which is stated to have similar features with the Cobra STR, has different algorithms and antenna placement compared to EIRS/TEIRS due to its weapon detection feature.
S-Band ASELSAN STR, which has AESA type antenna technology in which GaN T/R modules are used, will be able to calculate the coordinates of the firing points precisely after detecting the mortar, artillery and rocket projectiles carried out by the enemy elements in the air. Since the system can also calculate the possible drop points of mortar, cannon and rocket projectiles fired by the enemy, it will enable friendly elements in the relevant area to prevent loss of life and property by warning before the said ammunition falls to the ground. ASELSAN STR will transmit the coordinates of the enemy mortar, artillery and rocket systems to friendly fire support weapons over the radio and ensure their destruction. In this context, the system can also be used in the arrangement of shots fired by friendly troops.
ASELSAN STR, which has a solid state power amplifier, digital beamforming and high-performance signal and data processing infrastructure, will have 24-hour uninterrupted operation and air transport capabilities with the A400M Atlas Transport Aircraft. It is aimed that the STR can perform target detection from a range of 100km+. In this framework, depending on the caliber of the mortar fires, it can be detected from 25km to 50km away, and a Katyusha type artillery rocket can be detected from 100km away.
In ASELSAN STR, a tactical wheeled vehicle in the 6x6 configuration of the BMC product 10 ton class was used as the carrier platform. However, STR is designed to work independently of the platform. When necessary, it will be removed from under the vehicle and the radar can work alone. Unlike Cobra STR, ASELSAN STR consists of two separate carrier platforms. Unlike Cobra STR, in ASELSAN STR, the platform has been raised (the driver's seat is prevented from forming a blind spot) so that the antenna can rotate 360 degrees and be directed to the desired area, and the shelter, which is used as a command and control center, is placed on a separate platform. According to the information I have obtained, the AESA type STR antenna will be able to electronically scan a sector of 100 degrees instantaneously in a fixed position. It is stated that 360-degree coverage can be achieved by directing the antenna at certain angles thanks to special algorithms. The total weight of the antenna subsystem was about 4 tons, and the total weight of the system was aimed to be less than 10 tons. ASELSAN STR, which is stated to be operated by two operators and will have in-device testing capability, has two separate diesel generators, one of which is backup, and can operate 24 hours a day without interruption. The system can also supply electricity directly from the grid, without the need for a generator, in environments where there is an electrical grid.
In the meantime, only one of the two Cobra Weapon Detection Radars from HENSOLDT, which was donated to Turkey by the German Government in 2002, was used actively and the other for spare parts supply. Cobra STRs with a detection range of 40km+ last served on the Syrian border as part of Operation Olive Branch. According to the information I have obtained, new replacements for the defective spare parts were obtained from HENSOLDT company, thus the second defective Cobra STR was activated. HENSOLDT also planned to upgrade the Cobra STRs in its inventory from Version 1 to the latest version (Version 3+, even Version 4 and 5 are also on the agenda) and then make the radars fully operational by making a long-term maintenance contract. Therefore, at the moment, 1 ASELSAN STR and 2 HENSOLDT Cobra STR are operationally in service with the KKK.