ASTRA-OBC

Overview

On Board Computer is a ruggedized computer designed to carry out various functions, viz. control, guidance, monitor the health of sub systems. The OBC interacts with Receiver and Telemetry using 1553B bus. In addition OBC also has other interfaces like Discrete Outputs interface and control system interface (Analog I/O).OBC operates on 28 V DC input supply.The On Board Computer is based on distributed architecture system and real time data exchange is required between various subsystems. OBC is based on ADSP21060 processor. It has two channels of dual redundant MIL-STD-1553B buses.

Specifications of ASTRA OBC

CPU	Dual ADSP-21060LCWZ-160 processors with a clock frequency of 32 MHz.
Memory	SRAM 512K x 32 bits, -FLASH1 4M x 8 bits, -NVRAM 32K x 8 bits
Timers	Two programmable timers of minimum resolution 2µsec

I/O Specifications

1553 Channel	Two dual redundant bus channels of MIL-STD-1553B
Serial Channel	Three asynchronous RS422 serial channels
Analog Inputs	-12 single ended Analog input channels, -12 differential Analog input channels, -Each channel is of –10V to +10V with 12 bit ADC.
Analog Outputs	8 Analog output channels. Voltage range of -10V to +10V with 12bit resolution
Discrete Inputs	11 opto isolated discrete input channels for status monitoring
Discrete Outputs	14 discrete output channels
Power Supply Module	DC Input :18 to 36V, 2ADC Output :28V@ 1.2A, +15V@ 0.75A, 5V@5AEMI/EMC Filter :SCI-2160-013