Ground ERS data receiving and processing complex (GDRPC)

The basic GDRPC configuration comes complete with soft hardware for data reception from AQUA, TERRA and NOAA. The complex may be additionally equipped for data reception from Radarsat -2 and Resurs-DK1 spacecraft as well as from advanced domestic spacecraft Resurs-P, Kanopus-V and others.

Data reception from spacecraft in Х and L bands is via one frequency channel. For reception from satellites transmitting data via a few radio channels (for example, IRS series), the complex needs to be additionally fitted with signal receiving and processing equipment. A set of additional options is required for data reception from most of other operational ERS satellites.

Software designed to control the antenna and receiving complex performs the following basic functions:

Software allows GDRPC to be controlled from a remote terminal via a local network or the Internet.

The GDRPC software includes archiving and electronic image cataloguing equipment. Catalogued images are searched by the following key features:

The following software for visualization, photogrammetric and thematic ERS data processing may be supplied as an option:

Specifications of the GDRPC hardware (antenna and receiving complex) are provided in the following table.

Description	Value
Antenna complex
Reflector diameter (operation area), mm	2,400х2,670
Mirror system type	offset
Focal distance, mm	1,380
	Х-band		L-band
Gain factor at 8.2 GHz, dB (min)	43		27
Tuning range width at 8.2 GHz, ° (max)	1.0		4.6
Lateral lobe level, dB (max)	-15		-13
Elliptic coefficient	0.8		0.6
Antenna complex weight, kg (max)	360
Design	azimuth-elevation with 3rd axis*
	by elevation angle		by bearing angle
Operating pointing angle range, °	5 to 85		± 270
Pointing rate, °/с	10 max		20 max
Angular acceleration, °/с	4 max		8 max
System error of pointing in image plane, ang.min (max)	6
Pointing mean square error, ang.min (max)	4
Data receiving and recording equipment
	Х-band	L-band
Input carrier frequency range, GHz	8.035…8.38	1.69…1.71
Signal-carrier frequency at demodulator input, MHz	720	210
Radio receiver noise temperature, °К	≤ 70	≤ 50
Received signal power level at probability of data reception error of 10-6, dBm	-90…-60	-120…-90
Type of received signal modulation	BPSK, QPSK	BPSK
Input signal clock frequency, MHz	5…80	1.3308
Received radio frequency band, GHz	8.0…8.42	1.69…1.71
Demodulator input signal level, dBm	0…3	-65…-35
Receiving and recording rate, Mbit/s	320 max
Storage capacity, Gbyte (min)	500
LAN interface type	Ethernet 100/1000

* — delivered as an option. 3^rd axis is obtained by tilting the azimuthal axis.

The receiving equipment set includes in-process control equipment both in Х and L wavelength ranges.

Processor	Pentium 4, 3.2 GHz/1MB/800, Socket LGA775
Motherboard	Chipset 915
Random access memory	DDR400 (PC3200) 1024 MB
HDD	2 (60 GB + 200 GB), SATA
DVD	DVD-R/RW x16
Operating system	Preset, Windows XP Professional (Russian), SP2, CD distribution package, license

To provide the maximum coverage radius, the antenna complex must be installed so that the horizon is open from elevation angles of 2° or higher in any azimuth direction.

Essential for high-quality reception is absence of radiointerference within a range from 8.0 to 8.4 GHz (transmitters of radio relay, tropospheric and other communication lines).

A possible mounting location of the complex laboratory portion, i.e. operator’s workstation, relative to the antenna is restricted by the length of connecting cables (50 m).