An example of a WSN based on 10 sensors (nodes) and a single PCB prototype
An example of a WSN based on 10 sensors (nodes) and a single PCB prototype

The Wireless Sensors Network (WSN) will be designed to work with the Multi-link Telemetry Logger (MTL) provided by Thales Alenia Space. Data collected by the WSN will include physical parameters read by sensors, such as temperatures, pressures and accelerations, which later will be sent to the MTL. The MTL transmits the data to the ground Control Center where further data analysis will be performed.

WSN under tests
WSN under tests

An example of a WSN based on 10 sensors (nodes) and a single PCB prototype
The WSN designed by SpaceForest will be based on COTS (Commercial off-the-shelf) components. It is one of several requirements of the project. The WSN should also be characterized by a high mechanical durability (extreme conditions e.g. acceleration, vibration, radiation, noise etc.), reliability (sensor redundancy), low weight (20 to 40 % less than wired network) and low power consumption. The sensors will communicate in unlicensed 2,4 GHz ISM band with each other using a protocol similar to ZigBee.

SpaceForest will design two wireless sensor networks during the DEWI project. The first one will be a theoretical network, which will include 310 sensors. The theoretical WSN will be simulated and optimized in the application created for this purpose by SpaceForest. The second WSN will be designed based on a smaller number of sensors and tested in the relevant environment on-board the rocket (DEWI demonstrator). This network will also be optimized using a SpaceForest application for WSN simulation. The sensor amount and type for theoretical and demonstrator WSN is shown in Table 1:

 

Sensor type

Amount for theoretical WSN

Amount for demonstrator WSN

Temperature

200 sensors

20 sensors

Pressure/flow

100 sensors

10 sensors

Acceleration/gyro

10 sensors

1 sensor

 

The sensors will be configured with different sampling rates. Sampling rates which will be used for sensors are 1, 10 and 100 sample/sec.
First WSN tests will be performed in a laboratory environment. After all nodes are mounted on-board of the demonstration rocket, tests in real flight conditions will be carried out.

Bak to DEWI main page

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