TELEVISION CAMERA TVC

Measurement principle

One of the tasks of «Poperedzhennja» (WARNING) program is observation ionosphere’s emission in visible and infrared spectrum range from satellite’s board looking-for heralds of earthquakes. It’s needs solution satellite’s orientation problem for defining location of sources of ionospheric emissions above Earth’s surface with necessary accuracy. There is possibility to define orientation of photometric devices by using TV images of star background.

The CCD TV camera is designed for recording of images of star sky, Earth’ limb and adjoining part of Earth’ surface to fix the orbit point coordinates during the measurements by FAGOT and SICH-F devices. An additional task of TVC is receiving of large-scaled picture of ionospheric glow distribution.

Experiment configuration

CTV consists of the camera unit CU and the processing unit PU. CU consist of the input lens, filters wheel, CCD frame transfer area array sensors, preamplifier, double correlation sample, amplifier, temperature control. In PU are 12 bit ADC, 4 x 256K x 12 bit video memory, control logic and interface RS485.

Main characteristics of the instrument

• mass: PU £ 0.5 kg
• CU £ 2.0 kg
• sizes: CU 120x120x190 (mm)
• PU 100 x 100 x 20 (mm)
• consumed power £ 6 W
• power voltage 24 V
• lens 1:1.2, f=2.5 cm
• field of view, deg 12 x 16
• pixel (V x H) 288 x 688
• integral spectral range 420 - 900 nm
• filters bandwidth 420 - 650; 600 - 750; 700 - 900 nm
• spatial resolution £ 2 angle minutes
• time integration £ 0.1; 0.2; 0.4; 0.8; 1; 2; 4; 8 s
• time resolution 2, 4, 8 s

Operation

Orientation of the TVC optic axis: parallel to axis I of the FAGOT instrument.

The experiment has next modes of operation: recording of images of the star sky and Earth’ limb; storing of the data and their transmission; testing of device.

The data transmission is carried out using:

• 1 channel of digital telemetry - parallel 8 bites with rate transmission 1 BPS,
• 1 channel of analog telemetry (control)
• 1 channel of temperature measurement system (CCD temperature)
• 1 channels of fast telemetry with rate transmission 350 KBPS.

V.N. Ivchenko ivchenko@astrophys.ups.kiev.ua
V.P. Lapchuk lapchuk@astrophys.ups.kiev.ua