Radar imaging

SIGNAL (programming language)

Transmitter

Engineering

Radar horizon

Aerospace engineering

MIMO

Pulse repetition frequency

Range (aeronautics)

Telecommunications

Computer science

Antenna (radio)

Acoustics

Geology

Physics

Moving target indication

Electronic engineering

Pulse compression

Remote sensing

Transmission (telecommunications)

Programming language

Channel (broadcasting)

Clutter

Radar

Side lobe

Main lobe

Continuous-wave radar

IEEE Transactions on Vehicular Technology

Generally ground clutter has serious range dependence and range ambiguity in the forward-looking array airborne radar system under a high pulse repetition frequency (PRF) system. In this work, a range ambiguous clutter suppression method based on transmitting beam main lobe correction for the FDA MIMO radar is proposed. Firstly, this method uses the designed transmission pulse weights to compensate for the initial phases formed by the accumulation of frequency increments between pulses, so as to solve the problem that the main lobe high gain illuminated angle is inconsistent between the MIMO equivalent transmitting beampattern pulses synthesized at the receiving in the traditional FDA MIMO system. Secondly, by restoring and compensating received echoes, the influence of the main lobe correction weights of the transmitting signal is eliminated. Finally, through the characteristics of transmitter correction compensation to distinguish different range ambiguous clutters, the echoes from the range ambiguous areas can be discretely distributed in the power spectrum while preserving the signal echoes in the observation area. Thus range ambiguous clutter suppression is realized. The simulation results show that the proposed method can improve the clutter suppression performance compared with the MIMO and linear frequency increment FDA radar.

Range Ambiguous Clutter Suppression for FDA-MIMO Forward Looking Airborne Radar Based on Main Lobe Correction