Sampling Method of UWB Chirp Signal Based on Bilinear Transform

Abstract

The invention discloses an ultra-wideband linear frequency-modulated signal sampling method based on bilinear transformation and mainly aims at solving the problem of high sampling rate of a front-end analogue-digital converter on wideband signals in the prior art. The ultra-wideband linear frequency-modulated signal sampling method based on bilinear transformation comprises the implementation steps of (1) generating a local oscillating signal, (2) detecting, (3) synthesizing a reference signal, (4) performing dechirping transformation, (5) performing low-speed sampling, (6) performing interpolation, (7) synthesizing a conjugate reference signal, and (8) performing linear frequency modulation transformation. The ultra-wideband linear frequency-modulated signal sampling method based on bilinear transformation has the advantages that the reconstruction problem of an original ultra-wideband signal is converted into the problem of recovering the original ultra-wideband signal by use of a reference signal and the conjugate reference signal by virtue of dechirping transformation and linear frequency modulation transformation, and the sampling of analogue ultra-wideband linear frequency-modulated signals under the condition of a low sampling rate is realized.

Description

technical field [0001] The technical invention belongs to the field of communication technology, and further relates to a method for sampling ultra-wideband chirp signals using bilinear transformation in the field of radar technology. The present invention can be used for signal extraction of imaging radar adopting ultra-wideband chirp signal, dechirping and converting wideband signal into narrowband signal, performing orthogonal sampling, performing chirp after interpolation in digital domain to recover original broadband signal, for this The broadband signal is frequency shifted or time delayed to spoof the imaging radar. Background technique [0002] Imaging radar can image the target with high resolution, obtain more target information, and classify and identify the target, so it is widely used in modern radar. [0003] Jamming can generally be divided into suppressing jamming and spoofing jamming. At present, the suppressing jamming for imaging radar generally includes...

AI Technical Summary

Problems solved by technology

However, the disadvantage of this method is that for non-cooperative broadband signal reconnaissance, the calculation cost of the detection method cannot be reduced due to the inability to obtain the parameters of the broadband signal transmitter

If the transmitter parameters are obtained by other reconnaissance means, the reconstructed stop condition only reduces the number of matching times, and does not adopt any method to reduce the number of dictionary elements, which cannot solve the problem of a large amount of calculation for a single matching

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