Gyrostabilized optical system OGD-30

Its privileges: four built-in modules in a compact body (thermal imager, color camera, laser rangefinder, inertial module), light and durable body, active stabilization by two axes, detection of distance to the target.

Double-axis gyrostabilized suspension OGD-30 ensures a new level of stabilization thanks to specialized broadband moment detectors provides high level of stabilization thanks to the newest gyroscopes of the leading manufacturers and the most up-to-date program algorithms.

Three-dimensional inertial system mounted directly on the optical facility allows implementing widened functions, like improvement of digital control, is located inside the device’s body.

OGD-30 is equipped with a system of electronic stabilization, which allows compensating camera motion. The powerful computer and the software in the set form a system, with the help of which constant automatic video-tracking of the objects marked by the operator is implemented. Video processor ensures a function of target accompaniment and is able to process video signals coming at the same time from the thermal imager and color camera.

In the mode of accompaniment, the target is marked with a frame on the screen. The user can select one of the targets shown by the accompaniment device.

Table of basic characteristics

Television module
Resolution,	1920 х 1080 pixels
Image sensor (type CMOS)	1/3
Shielding glass	Quartz with protective spraying
Lens	f=4.3 mm (wide) to 130.0 mm (tele), F1.6 to F4.7
Optical magnification	300x (30x optical zoom /10x цифровой)
Camera sensitivity, from	0,5 lux
Focusing system	Automatic/Manual
Thermal imager module
Infrared camera with high resolution	Yes
System type	Uncooled
Shielding glass	Single-crystal germanium withDLCcoating
Lens type	60mm F 1/1.25
Sensor type	Infrared thermal converter of image, 640 x 512 VOx Microbolometer
Pixel size	25 μm
Spectral range	7.5 – 13.5 μm
Inversion and image return	2х and 4х digital zoom
Laser rangefinder
Measured distance	2800/1500 m , ±1 m (reflective/non-reflective)
Gyrostabilized suspension
Stabilization	2 axes, gyrostabilized
Maintenance of recording direction for set coordinates	Yes
Capture and accompaniment of target
Video accompaniment modes	Correlation, centroid vector, frame capture
Min. target dimension	8х8 pixels
Tracking window	Dynamically changeable
Aspect relation	To 1:6 in all directions
Max. target speed	32 pixels/s with 50 Hz
Accompaniment precision	1/10 pixels
Min. typical contrast of frame capture	12.5 gradations of gray: 4.9%
Min. number of typical spots of frame capture	5
Max. frequency of tracking error correction	60 Hz
Mass	3 kg

Auto accompaniment:

System processes the selected video input to detect or track the interesting objects
The latest algorithms of information processing
Electronic image stabilization
Qualitative functions of graphic data superposition
System ensures safety of operation and minimum time of delay when executing the most important tasks.

Function of auto accompaniment has 2 modes: mode of target detection and mode of tracking

Mode of target detection

In this mode, the system automatically defines and suggests incoming target or location of target in the area of video picture.

Window of detection with various positions and dimensions is used to define the working area of detection algorithm. Position and dimensions are controlled with the help of commands.

Detection mode is adjusted to detect contrast targets located in the center of detection window. Detection mode is used as detection phase for the selected tracking algorithm in the tracking mode. When the target is detected, automatic tracking of this target can be started, sending a tracking command.

Tracking mode

System enters tracking mode right after tracking command during functioning of detection mode. Algorithm in the detection mode must have a valid target to set dimensions and position of the tracking window.

The tracking window with various positions and dimensions is used to detect the interesting territory (target) within video image. The maximum and the minimum size depend on the selected tracking algorithm.

In the tracking mode, the system automatically tracks objects, which are located in the tracking window. Position and dimensions of the tracking window is automatically controlled the way that the interesting object stays inside the tracking window.

Electronic stabilization

To exclude video oscillations (horizontal and vertical) and provide the user with optic comfort, the system ensures a function of electronic stabilization. Its principle is tracking of motion of the incoming image and displaying the image without motion. It is possible to use electronic stabilization together with automatic tracking mode if there is a mistake of target position of the output data.

This mode generates a black frame around the stabilized image and can decrease the image dimensions. Integrator can adjust the electronic filter for selection of beam width of image stabilization.

Picture-in-picture view:

System ensures also the mode “picture-in-picture”. In this mode, one channel is sent to the display’s output channel, and at the same time, other channel is laid over as a small window with video in the area of led image. Dimensions and position of the output window may be partially adjusted by the user. Dimensions of PiP window can be adjusted with 1/6 or 1/8 width of the dimensions of the full-size frame. Any channel of the three video inputs may be selected by the user as PiP channel (television, infrared and course camera).

Tracking scheme

Tracking scheme is equipped with symbol generator, which inserts graphs and alphanumeric symbols into one of the video signal’s output.

Means of control of useful load

Useful load’s control panel is located on the ground control station and allows the operator of useful load to look through and record video information, switching between its flows.

Video flows may be saved for further playback or distribution.

To improve orientation, a 2-D card is led to the display with the current position of the drone aircraft and an image in the area of useful load of sweep of camera. A number of the most important parameters of drone aircraft is led in the real-time mode.