Steffen Heuel

Coexistence of S-Band radar and 4G mobile networks

Todays wireless network and radar systems are designed to obey a fixed spectrum assignment policy regulated by the Federal Communications Commission (FCC). The assignment served well in the past, but sparse or medium utilization of some frequencies confronts heavy usage of others. This ineffective spectrum allocation contradicts the dramatically increasing need of bandwidth for security systems like radar or mobile networks and causes the evolution of intelligent radios applying dynamic spectrum access i.e. cognitive radio. To underline the demand of dynamic spectrum allocation, this paper addresses coexistence between S-Band Air Traffic Control (ATC) radar systems and LTE mobiles operating in E-UTRA Band 7. Technical requirements for radar and mobile devices operating close to each other are addressed and coexistence validated by test and measurement performed at a major german airport. It is shown that throughput reduction, increased Block Error Rate (BLER) of these mobile radios and reduction of the probability of detection Pd of security relevant S-Band radar occur in the presence of the other service.

Test and measurement of coexistence between S-Band radar and mobile networks

Air traffic control radar, military air traffic surveillance radars, meteorological radars and mobile wireless communication operate in the S-band frequency range. Test and measurement of spectrum sharing methods and their co-existence is absolutely essential, as performance degradation of mobile devices, networks ans S-Band radars has been proven. This paper addresses potential issues, discusses approaches to testing and measuring LTE and S-band radar co-existence.

Coexistence of lte and radar systems methodology for benchmarking cooperative radar receiver performance

As the need to satisfy the global demand for wireless services continues, the pressure for valuable spectrum adjacent to radiolocation services is a topic of contention between incumbent spectrum users and national spectrum policy makers and regulators. The study of the coexistence of radar systems and modern LTE communications systems tend to focus on the measurements of the spectrum impacts of the radar transmission and the interference assessment of the LTE base station receiver. The study and measure of impact on the radar receiver has been studied mainly in theory. In this paper, the methodology and technique for benchmarking the radar receiver performance of cooperative radar systems in the presence of wireless systems is proposed.

Generation of correlated sea clutter for radar test

Test, measurement and verification of radar systems with their detection and processing capabilities are necessary to ensure function according to specification and requirements. Therefore field tests are often performed to test the radar system. This is not only expensive, but also requires a great deal of time. To reduce test complexity and cost, simulation techniques such as radar target simulators are used which bring parts of the field back into the laboratory environment. Target simulators however generate targets with a certain range, radial velocity, but struggle to simulate clutter, or in particular, sea clutter. This paper therefore introduces an approach to generate sea clutter and replay the signal with a vector signal generator. It shows common approaches modeling sea clutter statistically and introduces a novel approach to combine the statistical models with a physical ocean surface model. The simulated data is compared with measured data from different locations. This way, time and spatially correlated data that reproduces real-world sea clutter is generated and presented a less expensive and more time efficient way to conduct sea trials.