Timo Kumberg

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Atmospheric measurement of radioactive xenon isotopes (radioxenon) plays a key role in remote monitoring of nuclear explosions, since it has a high capability to capture radioactive debris for a wide range of explosion scenarios. It is therefore a powerful tool in providing evidence for nuclear testing, and is one of the key components of the verification(More)
In this article, we present a novel structural health monitoring system based on a wireless sensor network for GNSS (global navigation satellite system) receivers. The GNSS network presented here consists of three GNSS rover stations and one base station that are deployed at the Neckartal bridge on the Autobahn A81 in southwest Germany. The newly-developed(More)
Wireless sensor networks are deployed in many monitoring applications but still suffer from short lifetimes originating from limited energy sources and storages. Due to their low-power consumption and their on-demand communication ability, wake-up receivers represent an energy efficient and simple enhancement to wireless sensor nodes and wireless sensor(More)
We recently presented T-ROME a cross-layer routing protocol for wake-up receivers, along with a Markov chain based framework to model and analyze wake-up receiver based routing protocols. Using this analytical framework, we present here a modification to T-ROME that omits several messages but does not change the basic behavior of T-ROME. We analyze the(More)
Wake-up receivers are the natural choice for wireless sensor networks because of their ultra-low power consumption and their ability to provide communications on demand. A downside of ultra-low power wake-up receivers is their low sensitivity caused by the passive demodulation of the carrier signal. In this article, we present a novel communication scheme(More)
The basic design of the traditional wake-up receiver implemented by different publications in the last few years is essentially based on a shared radio channel where a low frequency signal (which is modulated on a high frequency carrier, typically close to the 868 MHz ISM band) is transmitted. This signal is modulated using the OOK (On-Off Keying) scheme(More)
Small scale fading signals resulting from multipath propagation can cause signal strength variations in the range of several dB. Resulting from the fluctuating signal strengths, the wake-up packet reception rate can decrease significantly. Using antenna diversity can greatly mitigate these effects. This article presents a novel wireless sensor node with(More)
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