Niklas Hehenkamp

• Master of Science
• Research Assistant at German Aerospace Center (DLR)

The ground-wave signals of terrestrial radio navigation systems, which operate in the medium and low frequency band, are sensitive to changes in the electrical parameters of the Earth's surface between the transmitter and receiver. Sea ice affects the electrical parameters of the sea and leads to an additional signal phase delay compared to the pro...

Time delays caused by ground wave propagation are the primary source of systematic error limiting the performance of the medium-frequency R-Mode radionavigation system. To achieve the desired ranging accuracy and compensate these delays, we have conceived a comprehensive correction scheme based on the prediction and application of the Atmospheric a...

Radionavigation systems that operate in the low and medium frequency band require an accurate prediction of the electromagnetic ground wave propagation delay that is caused by the finite conductivity and permittivity of the earth’s surface. To consider the complex pattern of the mixed land-sea propagation path in the application of the terrestrial...

Nowadays, the maritime sector strongly relies on global navigation satellite systems (GNSS) for the provision of position, navigation, and timing (PNT) information. The standard functionality of several ships’ bridge instruments depends on such information, which becomes critical to have a safe and reliable navigation. Nevertheless, the possibility...

The advent of global satellite navigation systems (GNSS) has revolutionized the provision of position, navigation and timing (PNT) information. Thought to be always available and reliable, these systems may experience outages and they can be threatened by interference events. In such cases, alternative positioning, navigation and timing (APNT) syst...

Global Navigation Satellite Systems (GNSS) constitute the cornerstone for outdoor positioning, which is essential information for prospective automated vehicles. The combination of GNSS with terrestrial ranging, for instance in the form of 5G or UWB, will make accurate positioning a reality even in urban canyon scenarios where GNSS is likely to fai...

Several studies have shown that the signals of marine radio beacons, which operate in the maritime medium frequency (MF) band, can be modified to enable range and position estimate. This technology called Ranging Mode (R-Mode) faces challenges in the resolution of ambiguities and suppression of multipath interference which are related to the small...

This paper presents an overview of the development of a terrestrial positioning system called Ranging Mode (R-Mode) in the Southern Baltic Sea region which utilizes already existing maritime radio infrastructure. Here, an R-Mode testbed is planned to be set up until 2020 that meets maritime user needs for resilient PNT. First measurements of radio...

Due to the worldwide recognition of increased jamming and spoofing events, which threaten the usability of global navigation satellite systems (GNSS), positioning systems using signals of opportunity are gaining importance as backup systems. Especially for maritime usage, a terrestrial system called Ranging-Mode (R-Mode) is under development. Among...

This paper presents an overview of the development of a terrestrial positioning system called Ranging Mode (R-Mode) in the Southern Baltic Sea region which utilizes already existing maritime radio infrastructure. Here, an R-Mode testbed is planned to be set up until 2020 that meets maritime user needs for resilient PNT. First measurements of radio...

The key requirement for safe and secure shipping at sea is careful surveillance of the traffic situation. The primary sensor on board for this purpose is the radar. Multiple functions of the radar, such as sea and rain clutter suppression, exist to improve the visual recognition for the nautical personal. As of today there is only the option to set...

Multi-Access Edge Computing (MEC) is an emerging technology that is promising for applications demanding a low latency and high bandwidth using cellular communication techniques. Vehicular communication is regarded as key technology on the way to fully autonomous vehicles. The requirements for safety critical applications in vehicles are harsh conc...

Many recent Engine Management Systems (EMSs) have multicore processors. This results in new challenges for the developers of those systems, as most of them are not familiar with multicore programming. Additionally, many of the EMSs have real-time requirements, which need to be met. This paper introduces embedded parallel design patterns (ePDPs), wh...

Safety critical embedded systems in the automotive domain will increasingly depend on parallel processing archi-tectures. Since concurrency has largely been exploited on task level, future applications will feature growing proportions of parallel implementations on data level such as loop parallelism. Efficient memory utilization becomes inevitable...