Radar imaging

SIGNAL (programming language)

Algorithm

Engineering

Frequency domain

Aerospace engineering

Pulse repetition frequency

Range (aeronautics)

Telecommunications

Inverse synthetic aperture radar

Radar tracker

Computer science

Acoustics

Classical mechanics

Geology

Physics

Optics

Astronomy

Synthetic aperture radar

Time–frequency analysis

Artificial intelligence

Remote sensing

Azimuth

Programming language

Acceleration

Clutter

Radar

Continuous-wave radar

Pulse-Doppler radar

Computer vision

Doppler effect

IEEE Transactions on Geoscience and Remote Sensing

In this paper, we propose a long-time coherent integration method for a maneuvering target with the first-, second-, and third-order range migrations, and the complex Doppler frequency migration. In this method, after range compression, the echo signal is first transformed into the range-frequency and Doppler domain based on series reversion, and then an azimuth matched filtering procedure is implemented in the 2-D frequency domain. It can eliminate the coupling effects between range and azimuth jointly caused by the radial velocity, radial acceleration, and radial acceleration rate of a moving target. Due to the linear transform property, the proposed method can work well under low signal-to-clutter and noise ratio. In addition, the Doppler ambiguities, when target azimuth spectrum either is within a pulse repetition frequency (PRF) or spans over neighboring PRF bands, can be well solved. Both simulated and real synthetic aperture radar data processing results are provided to validate the effectiveness of the proposed algorithm.

Long-Time Coherent Integration Algorithm for Radar Maneuvering Weak Target With Acceleration Rate