Evaluation of a Neural-Network-Based adaptive Beamforming Scheme with Magnitude-Only Constraints

In this paper, we present an adaptive beamforming scheme for smart antenna arrays in the presence of several desired and interfering signals, and additive white Gaussian noise. As compared with standard schemes, the proposed algorithm minimizes the noise and interference contributions, but enforces magnitude-only constraints, and exploits the...

Signal processing for FMCW SAR

The combination of frequency-modulated continuous-wave (FMCW) technology and synthetic aperture radar (SAR) techniques leads to lightweight cost-effective imaging sensors of high resolution. One limiting factor to the use of FMCW sensors is the well-known presence of nonlinearities in the transmitted signal. This results in contrast- and range...

Passive ranging with flank and towed array sensors

In the current sensor suites on board submarines the Passive Ranging Sonar (PRS) is a separate sensor, usually with three or more hydrophone groups on either side of the submarine. The aperture of this sensor is limited by the length of the boat, which makes ranging up to moderate distances possible. The combination of the towed and flank array...

Photonic true time delay beamformer demonstrator for a radio astronomical array antenna

Photonic integration for phased-array applications

The use of photonics for phased-array applications has been discussed for quity some time. Main difficulties up to now have been the component count and cost for relative complex systems. The advances in photonic integration are very promising to bring down both, as well as reduce volume and weight of phased-array beamforming networks as...

Photonic Integrated Circuits for Phased-Array Beamforming

Photonic integration is very promising to bring down volume and weight of phased-array beamforming networks. In addition, photonics allows for increased functionality for wide bandwidth systems. In this paper we demonstrate the feasibiÌity of phase and amplitude control of a 16-elernent phased-array antenna with a single InP integrated circuit....

Coherent Photonic Integrated Beamformer for Phased-Array Antennas

The feasibility of an extremely compact Photonic Integrated Circuit for controlling phase and amplitude of a 16-element phased-array microwave antenna has been demonstrated experimentally

Photonic integrated circuits for radar beam control

Photonic integrated circuits have the potential to reduce the volume and weight of optical beamforming networks for phased-array radar antennae by more than one order of magnitude, and will drastically reduce packaging and interconnection costs by integrating subcircuits, consisting of many components, on a single chip. Most work on optical...