Abstract
The high-resolution, frequency-stepped chirp signal can be applied to radar systems employing narrow-bandwidth chirp pulses, in order to enhance the range resolution, and to implement SAR/ISAR imaging capabilities. This paper analyzes the effect of moving targets on the synthetic high-resolution range profile obtained using this signal waveform. Some constraints are presented for compensation of the radial motion from shift and amplitude depression of the synthetic range profile. By transmitting two chirp pulses with the same carrier frequency in a pulse-set, a method of ground clutter cancellation is designed with respect to this signal format. Finally, our simulation data demonstrate the effectiveness of the proposed method.
Highlights
Radar range resolution is determined by the bandwidth of the transmitted pulse
This fact allows the transmission of waveforms with extremely wide overall bandwidth without the usage of the expensive hardware needed to support the wide instantaneous bandwidth
By means of synthetic bandwidth generated by frequency-stepped chirp signals instead of frequencystepped narrow pulses, high range resolution can be realized and the detection distance can be increased
Summary
Radar range resolution is determined by the bandwidth of the transmitted pulse. Classically, high range resolution is obtained by either transmitting very short pulses, or modulating the pulse to achieve the required bandwidth. This technique can be utilized to introduce imaging capability to an existing narrow-bandwidth radar [2] This method has the unfortunate drawback that target energy spills over into consecutive coarse range bins due to the matched-filter operation. By means of synthetic bandwidth generated by frequency-stepped chirp signals instead of frequencystepped narrow pulses, high range resolution can be realized and the detection distance can be increased . Another advantage of replacing the fix-frequency pulse with chirp pulses is known to lower the grating lobes that appear in the range response [4, 15].
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