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A stepped-frequency sonar imaging method with low range sidelobe peak (SLP) is proposed. Two linear frequency modulation (LFM) pulses with partly overlapped bands and opposite modulation directions are used; and both auto- and cross-correlation functions are taken to synthesize the low SLP range profile. With the presence of echo misalignment, a 2-D searching method is given to find the optimal signal...
A high angle and range resolution imaging method using a double-ping frequency diverse multiple-input multiple-output (MIMO) sonar is proposed. The proposed MIMO sonar is composed of a uniform linear array (ULA) and two transmitting elements located at the two ends of the receiving ULA. The interelement spacing of the two transmitting elements is equal to the produce of the inter-element spacing and...
In this paper, a novel interferometric 3-D imaging algorithm for spinning targets is proposed based on narrow-band radar. The height information of the scatterer is estimated by the phase difference between the same scatterer in two 2-D images generated by two antennas at closely-separated elevation angles via narrow-band radar imaging algorithms. For imaging of rapidly spinning targets, however,...
The range resolution of an imaging sonar is difficult to be improved due to the restriction of the instantaneous bandwidth of the sonar system. To increase the range resolution of the imaging sonar, an imaging method with the use of the comb spectrum signal, which is composed of a set of continuous wave (CW) pulses with different center frequencies, is proposed. After the round-trip propagation these...
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