OKO – 60 is a surveillance system based on a Surveillance Module (SM), which is launched off a 60 mm mortar and descents on a parachute. During its descent, the Surveillance Module (SM) radio transmits a video signal, which is visualised on the Ground Receiver Device (Light Ground Control Station – LGCS).
The surveillance projectile is launched off an observation mortar and adopts a flight path along a regular ballistic trajectory. While the projectile is in its descent trajectory, a special explosive charge is deployed (so called dispersing explosive charge) in order to release the Surveillance Module (SM) along with a parachute, which descents over the surveilled area.
The Surveillance Module (SM) itself comprises three key elements: These elements are: a CCD camera, a magnetometer module (electronic compass) as well as a radio transmitter of video signal. The electronic compass is used to enhance the quality of the visualised image. It is an important function, since during its descent on a parachute the Surveillance Module (SM) inevitably falls into some rotary motion – which hinders the surveillance to some extent. For this reason the signal transmitted to the Ground Control Station also provides information on the position of surveillance video camera in relation to the magnetic north. With this information the software of the Ground Receiver Device is able to compensate the rotary motion.
A great deal of elements of the projectile carrying the Surveillance Module (SM) is based on the S-LM 60 illuminating projectile. The main difference between the two projectiles lays in their content – the so called illuminating charge embedded in the illuminating projectile has been replaced by the Surveillance Module (SM).
The receiver with a directional antenna constitutes an important element of the system. In order to enable managing of the OKO – 60 surveillance system it must be equipped with another system, which allows for effective visualisation of the video signal and provides additional functions, such as storing (archiving) of recorded images, saving of so called freeze frames for further analysis. These functions are available at the Ground Receiver Device. The Ground Receiver Device provides live video surveillance as well as allows for saving the signal in a computer file. Video files are archived in the Ground Receiver Device memory, they can also be saved on a USB mass – storage device. The Ground Receiver Device allows to play the pre-recorded video images and to create so called freeze frames, or in other words it allows for on-going storage of current visualisation in .jpg type files.
The most interesting feature of the Ground Receiver Device is its ability to create so called mosaic. The pre-recorded video images reveal the swings of the Surveillance Module (SM) as it descents on a parachute. In addition the Surveillance Module (SM) falls into a moderate rotary movement. This feature hinders the interpretation of the video image to some extent as each second of the image projects slightly different area. This phenomenon could be used by an observer to his or her advantage. One of the features of the Ground Receiver Device software is automatic patching of subsequent frames of the video image in such way that it creates one large photograph of the surveilled area (a high resolution photograph).