ISAR Imaging Based on the Wideband Hyperbolic Frequency-ModulationWaveform

Sensors

Yao-bin Lu¹  Chun-mao Yeh¹  Kan Jin²  Jian Yang²  Wei Zhou² 

[1] Beijing Institute of Radio Measurement, Beijing 100039, China;Department of Electronic Engineering, Tsinghua University, Beijing 100084, China;

关键词: inverse synthetic aperture radar (ISAR);    hyperbolic frequency modulated (HFM);    linear frequency modulated (LFM);    Doppler invariant;    pulse compression;   

DOI  :  10.3390/s150923188

来源: DOAJ

【 摘 要 】

The hyperbolic frequency-modulated (HFM) waveform has an inherent Doppler-invariant property. It is more conducive than the conventional linear frequency-modulated (LFM) waveform to high speed moving target imaging. In order to apply the HFM waveform to existing inverse synthetic aperture radar (ISAR) imaging systems, a new pulse compression algorithm is proposed. First, the received HFM echoes are demodulated with the transmitted signal, which is called “decurve” in this paper. By this operation, the bandwidth of the demodulated echoes is effectively reduced and can be processed by the existing narrow-band receiver. Then, the phase of the decurved HFM echoes is analyzed, and thus, the pulse compression is accomplished by space-variant phase compensation. In addition, the space-variant phase compensation is realized by resampling and fast Fourier transform (FFT) with high computational efficiency. Finally, numerical results illustrate the effectiveness of the proposed method.

【 授权许可】

Unknown