FMCW multiple‐input multiple‐output radar with iterative adaptive beamforming

Abstract

This work presents the design of a frequency modulated continuous wave (FMCW) multiple-input multiple-output radar system with collocated antennas. A key part of this article is the modification and application of the iterative adaptive algorithm (IAA) for digital beamforming to an FMCW radar system. The implemented system operates in the 2.4 GHz Industry, Scientific and Medical band with 100 MHz of bandwidth and consists of a transmit (TX) site with four antennas and a receive (RX) site with four antennas. The angular resolution is greatly improved from 15° with the common delay-and-sum beamforming to only 5° with IAA beamforming, which was verified by the results from a radar simulator and by a field test with the implemented hardware. The challenge of synchronisation and maintaining phase coherence in systems with remote TX and RX sites is also addressed by proposing a low-frequency clock and trigger distribution system. This approach allows for costefficient systems which can be distributed over longer distances.

Sea Clutter Suppression Method of HFSWR Based on RBF Neural Network Model Optimized by Improved GWO Algorithm

“…Nowadays, HFSWR is widely used in coastal warning, maritime rescue, marine resource development, and many other fields, and it plays an important role in military and civilian areas [ 4 – 6 ]. Also, a series of innovative research on radar systems made by Ranger, the marine traffic detection EU project, makes the long-distance maritime surveillance radar have a better practical effect [ 7 , 8 ].…”

Decoupled narrowband robust adaptive beamforming based on the ADMM in a noisy channel

“…To deal with these problems, many robust beamformers have been presented in recent years. These beamformers can be divided into the following categories: the diagonal loading (DL) methods [2–9], the eigenspace‐based methods [10–14], the sparse reconstruction methods [15–18], and the INCM reconstruction‐based [19–23] methods.…”

“…To combat the small number of snapshots, many sparse reconstruction beamformers are proposed in [15–18]. In [15], an iterative adaptive approach (IAA)‐based beamformer is presented to reconstruct the INCM through acquiring the IAA spatial spectrum.…”

“…In [15], an iterative adaptive approach (IAA)‐based beamformer is presented to reconstruct the INCM through acquiring the IAA spatial spectrum. In [16], the radar reflection coefficients are estimated through IAA to obtain the covariance matrix. In [17], a compressive sensing problem is formulated and solved via least squares to estimate the direction and powers of the signal and interferences.…”

A multisource communication gateway and An advanced visualization interface for maritime surveillance systems based on the inter-VTS Exchange Format Service

“…the oth radar (https://www.diginext.fr/en/offer/critical-operation-support-systems/hf-surface-wave-radar) is a high-frequency surface wave radar system that has the ability to detect targets at very large ranges. the photonically enhanced multiple-input multiple-output (Pe-mimo) radar [8,9] is an innovative system that supports the oth radar for detecting targets in close range over several kilometres with high resolution. the early warning system (ews) constitutes the backend of the rAnger system and is responsible for early detection of events, data storage and provision of warnings and alerts.…”