Ukrainian Centre of determination of the Earth Orientation Parameters
Main astronomical observatory of the National academy of sciences of Ukraine
Satellite laser ranging satation Golosiiv-Kiev
of the Main Astronomical Observatory NAS of Ukraine
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Hardware
The SLR station Golosiiv-Kiev consists of the following basic technical systems:
- laser,
- transmitting-receiving system,
- operation system of the telescope,
- time and frequency service,
- visual control system,
- meteo service,
- data collection and analysis system.
The main technical characteristics of the SLR station Golosiiv-Kiev are the following:
| expected overall accuracy of the system | Δ 6 cm | |
| operating staff | 1 person | |
| calibration | pre, post, external | |
| range of operation | 400 - 5000 km | |
| observed scale | 20o - 90o | |
| maximum angular rate in azimuth and zenith | 3 deg/sec | |
| accuracy of tracking | 30 arcmin |
The laser Nd: YAG, PULSAR-3 was installed at the Golosiiv-Kiev SLR station. The main characteristics of the laser are as follows:
| wavelength | 532 nm |
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|
| repetition rate | 10 Hz | ||
| pulse energy | 3 - 15 mJ | ||
| mode | TEMoo | ||
| pulse width | 450 ps | ||
| divergence | 0.4 mrad | ||
| controlled change of the laser beam divergence on the telescope output | 20 - 60" |
The transmitting-receiving system has start and stop channels.
Start channel consists of
| start detector | self-made (1 nsec rise time) avalanche phototransistor |
Stop channel consists of
| PMT | FEU-79 | |
| spectral filter | 8A, 70%, 532 nm | |
| pulse amplifier | ||
| discriminator |
self-made, maximum likelyhood | |
| time interval counter | SR620 (since 2000) |
The operation system of the telescope involves three parts:
- telescope,
- step-motor drivers,
- position sensors of the telescope (encoders).
The telescope TPL-1M has the following characteristics:
| optical system | coude focus |
 |
|
| transmitting-receiving system | combined in the same telescope | ||
| primary mirror diameter | 1 m | ||
| secondary mirror diameter | 0.25 m | ||
| field of view | 120*120 arcsec | ||
| equivalent focal distance | 21 m | ||
| mounting | altazimuth | ||
| point accuracy | 20" | ||
| divirgency | 20-60 arcsec |
The telescope mount has the following peculiarities:
| velocity of tracking possibility | 0-3 deg/sec |
 |
 |
|
| encoder resolution | 0.6 arcsec | |||
| laser | in coude focus | |||
| Az-EI computer controlled tracking | step by step | |||
| El encoder | Az encoder |
The time and frequency service presented by
| GPS time receiver & rubidium frequency standard | 1 microsec accuracy | stationary MAO service | |
| quarts frequency standard | stability 10-9 |
The visual control system consists of the telescope guide and CCD camera.
The main characteristics of the telescope guide are:
| galilean | ||
| diameter | 12 cm | |
| field of view | 30'*30' | |
| equipped with CCD | CCTV Corp., 3*10-5 Lux GBC CCD. |
The meteo service has the following characteristics:
| type | self-made | |
| temperature | 0.5oC | |
| pressure | 1 mBar | |
| humidity | 5 % |
The data collection and analysis system is equipped by
| IBM-PC486, 24Mb, 500Mb, 133MHz | for mount tracking | |
| IBM-PC486, 24Mb, 10Gb, 100MHz | for the main procedures |