Satellite laser ranging satation Lviv
of the Astronomical Observatory of the Ivan Franko National University of Lviv

Hardware

The SLR station Lviv consists of the following basic technical systems presented in the general block-scheme:

• telescope,
• laser,
• system for shaping "Start" signal,
• system for shaping "Stop" signal,
• guide system,
• time and frequency service,
• data collection and analysis system.

SLR station Lviv has the following technical characteristics:

	expected overall accuracy of the system	Δ 2 cm
	operating staff	2 persons
	calibration	pre, post, internal
	range of operation	800 - 9000 km
	observed scale	20o - 85o
	maximum angular rate in azimuth and zenith	2 deg/sec
	accuracy of tracking	100 arcmin

The SLR station Lviv is equipped with the telescope TPL-M which has the following characteristics:

	primary mirror diameter	1 m
	focus distance at 532 nm	11.6 m
	field of view	25'* 25'
	stars image diameter	3 arcsec
	guide diameter	0.25 m
	guide field of view	1o
	mounting	altazimuth
	point accuracy	10 arcsec
	step-motor	1.2"

The telescope mount has the following peculiarities:

	velocity of tracking possibility
	encoder resolution
	laser	in coude
	Az-EI computer controlled tracking	step by step

The laser SL-212 is characterized by:

	wavelength	532 nm
	pulse energy	100 mJ
	pulse width	150 ps
	repetition rate	5 Hz
	controlled change of the laser beam divergence on the telescope output	6 - 50"

The system for shaping "Start" signal consists of two blocks:

	avalange photodiode	LF-2
	start discriminator type	ORTEC-935

The system for shaping "Stop" signal consists of three blocks:

	photomultiplifier	FEU-136
	pulse amplifier	VT-120
	stop discriminator type	ORTEC-935

Time and frequency service has the following blocks:

	rubudium standard
	fitting to the UT by means of GPS system	1 mks
	events timer
	time resolution	40 ps

Guide system	Data collection and analysis system