LOCUS XBTx (Adaptive X-Band Transmitter) developed by ASELSAN for transmission of the payload data from LEO Earth Observation Satellites to ground stations.
XBTx performs the acquisition and reception of payload data, modulation and coding, digital to analog conversion, RF upconversion, amplification and filtering functions.
XBTx supports high data rate (SCCC, DVB-S2) and legacy (4D-8PSK-TCM) waveforms. XBTx also supports adaptive/variable modulation and coding, which allows the usage of variable data rates, high volume of data transmission and robust link budget performance.
XBTx provides the usage of static digital pre-distortion which aims to improve the linearization of high-power amplifiers (TWTA or SSPA).
Baseband Data Processing
Waveforms
- Adjustable up to 64 APSK with following options:
- Legacy waveform: 4D-8PSK-TCM (CCSDS-401, Article 2.4.18, Annex-1) and RS channel coding (CCSDS131.0-B-3)
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- CCSDS 131.2-B-1 Flexible Advanced Coding and Modulation Scheme for High Rate Telemetry Applications (SCCC)
- CCSD-131.3-B-1 CCSDS Space Link Protocols Over ETSI DVB-S2 Standard
Roll-off Options : Adjustable and compatible with CCSDS standards
Output Symbol Rate : Adjustable up to 150 Msps
Input User Data Rate: Up to 800 Mbps
RF
Carrier frequency range : 8025 MHz – 8400 MHz (Center frequency isadjustable with respect to used symbol rate)
Output RF power : -10 to +6 dBm (Adjustable)
Budgets
Bus Voltage : Unregulated between 22 VDC and 38 VDC
Power consumption : < 20 W
Dimensions : < 240 x 110 x 170 mm3 (WxLxH)
Mass : < 2.5 kg
Environmental Conditions
Temperature range : Operating: -20°C to 55°C (Acceptance)
Non-operating : -25°C to 60°C (Acceptance)
Random Vibration and Shock Levels : To be supplied on demand
Radiation Tolerance TID : >30 krad
SEL: LETth > 60 MeV.cm2/mg
RAMS
Lifetime: > 8 years
Power switch on-off cycles: > 50000 cycles (1 cycle = OFF ON OFF)
User Data Interface
Physical layer : LVDS
Connector: Micro-D with 25 pins
Data flow control: Yes with using LVDS Return Link
Redundancy: Redundant LVDS interfaces
I/O Connectors
TM/TC connector: Sub-D with 15 pins (MIL-STD-1553B)
Power connector: Sub-D with 15 pins (with TC ON&OFFcommand and TM ON/ OFF status)
LVDS connectors : Micro-D with 25 pins
RF connector : SMA female (50 Ohm)
TM/TC Interfaces
Digital TM/TC interface: MIL-STD-1553B
High level commands: HV-HPC ON and OFF commands (Compatible with ECSS-E-ST-50-14C)
Bi-level telemetry: BDM ON/OFF telemetry (Compatible with ECSS-E-ST-50-14C)
Contact us for more details: marketing@aselsan.com
