Group SD0702/Requirments Capture
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Requirements Capture NASA Design Team
Extraplanetary Exploration Suit Physiological Sensor System (EESPSS)
Created On: 31 January 2007 Last Modified: 31 January 2007
Introduction:
The goal of the NASA design team is to create a new sensor subsystem that will be implemented into a new extraplanetary space suit. These sensors are going to transmit various physical data from the space suit to a base station. This base station will receive the information from multiple space suits. It will sort, display, and log the various information sent from each space suit using a graphical user interface.
Background:
Over the years the NASA space suit has had modifications, but hasn't gotten its much needed makeover. NDSU in cooperation with UND has taken charge in creating a new sensor system to monitor each particular astronaut's physiological data. NASA has asked us to create a system to monitor, display, and log all physiological data from various space suits.
Goals:
Our goals are to have 2 working prototypes by December. These prototypes will include 11 sensors located in various parts of the suit. The sensors will include: -2 body temperature sensors -1 External temperature sensor -1 Humidity Sensor -1 Pressure Sensor -2 Carbon dioxide sensors (CO2) -2 Oxygen Sensors (O2) -1 Heart rate/SP02 Sensor sensor -1 Respiration rate sensor
Further Description:
The sensors will be connected to different types of signal conditioning circuits. The signals coming from the conditioning circuits will be fed into an MSP430F2254 processor, where it will be analyzed and parsed into a transmission protocol string. The string is sent out the UART bus to the XBee wireless transmitter. The prototypes will use the wireless transmitter to send a message with the data collected from the sensor. A receiver inside the astronaut's backpack will get the messages and then send out a message, containing all the sensors’ data it has received, to the base station. The wireless transmission system must send a signal 1 mile applying line of sight rules. The wireless transmission system must also be able to accommodate multiple space suits. The base station is to be designed to be an easy to use graphical user interface that will display the real-time data being received by each suit, meanwhile logging the data into a database. The database will be designed so that the user will be able to be search through and display data from specific times and suits.
Requirements:
Sensor Systems:
-As compact and comfortable as possible -Use off-the-shelf sensors -Withstand enough vibration to be used on a ATV type 2-stroke engine -Total combined weight must not exceed 1 kg including power supplies -Made to be easily replaced in case of failure
Base Station:
-Work on a windows based machine -Be able to display, monitor, and log data from each space suit
Prototype:
-Have 2 working prototypes by completion date -Transmit at least 1 mile from backpack to base station
