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We are happy to announce that PR4 has been selected for participation in REXUS 31/32! We are working very hard on getting our new website live. In the meantime, please find our press release below.


Dutch student team of TU/e and RU selected for rocket experiment

Determining the position of a rocket live to within a few centimetres during its entire flight. That is what a team of researchers and students from Eindhoven University of Technology and Radboud University Nijmegen are going to test during an experimental rocket launch in Sweden in March 2023. With their method - up to ten times more accurate than GPS - rockets may be better steered to land at the right place. They also measure the arrival direction of cosmic rays.

The Eindhoven and Nijmegen team's experiment, called PR4, is one of the projects selected to participate in the European program REXUS, an initiative of the Swedish, German and European (SNSA, DLR, ESA) space agencies. This involves two rockets going into the air each year, each carrying four to five experiments by student teams from different countries. "We passed the selection for the second time," says project leader and Radboud student Jan Stammes. "That is certainly not a matter of course as there are many teams competing throughout Europe. For example, there were also two teams from Delft that competed."

The rocket will be launched at Esrange, near Kiruna in northern Sweden. The rocket is expected to remain airborne for about fifteen minutes and reach an altitude of eighty to one hundred kilometers. PR4 Space's goal is to conduct two experiments during the flight: accurate positioning and radiation measurement. "In addition, this initiative is intended for students to become familiar with space travel and what protocols are involved," said student Daan Kapitein.

The location of the rocket is measured 1000 times per second

The method developed by the team for locating the rocket uses a technique called radio interferometry. In this technique, three antennas are used to transmit radio signals at slightly different frequencies from the rocket. These signals are picked up on the ground by six self-designed ground stations around the launch base. "Based on the phase difference between the arriving signals, we can recognize what the location of the rocket is," Stammes explains. "What is new now is that we can track the rocket live with this new technique." The location of the rocket is measured 1,000 times per second, determining it to within a few centimeters - up to ten times more accurate than GPS.

"With a detector, we are trying to determine the direction of arrival of cosmic rays."

In addition to determining location, the researchers will also experiment on the rocket with measuring radiation from space. "With a detector we are trying to determine the arrival direction of cosmic rays" said student Tom Reuvers. "In doing so, we are using the results of the radio interferometry experiment, so we know the location and orientation of the rocket very precisely at any time during the measurement. This is a step further than what we did last time. Then we focused on determining the amount of cosmic rays. Later, we want to investigate whether there is a link between this radiation and cloud formation".

The team's achievements can be followed on Facebook and Instagram.

PR4 Space is a collaboration of research group Electronic Systems (faculty of Electrical Engineering) of Eindhoven University of Technology, Radiolab of Radboud University and the European space agencies DLR, SNSB and ESA.