Linear frequency modulation chaotic noise waveform and de-ramping processing method for the same

Abstract

The present invention provides a linear frequency modulation chaotic noise waveform and a de-ramping processing method for the same. The linear frequency modulation chaotic noise waveform generates a chaotic sequence through the use of chaotic mapping, and then the generated chaotic sequence is subjected to the linear interpolation processing, resulting in the generating of each Chip sub-pulse frequency modulation sequence; and the sub-pulse frequency modulation sequences after interpolation are synthesized as a chaotic noise signal frequency modulation sequence, wherein the linear interpolation processing means the linear interpolation processing between two chaotic sequence values. The chaotic noise signal frequency modulation sequence is subjected to the radar waveform frequency modulation to obtain a chaotic noise waveform; the chaotic noise waveform is linearly frequency modulated to finally obtain the linear frequency modulation noise waveform. The waveform noise radar signal designed by the invention achieves constant amplitude and good band-limiting performance, thereby improving the transmitting efficiency of a noise radar transmitter. At the same time, this waveform can be de-ramped, greatly reducing the receiver's requirement for A / D sampling rate and reducing the amount of data collected and stored.

Description

Technical field [0001] The invention relates to the field of noise radar waveform design and radar signal processing, in particular to a linear frequency modulation chaotic noise waveform and a de-skew processing method. Background technique [0002] Noise radar, as a new system radar, was proposed in the 1950s. Compared with the traditional radar system with fixed waveforms, noise radar emits random noise signals, and the waveforms are not coherent with each other and have good orthogonality. Due to the randomness of the noise waveform emitted by the noise radar and the continuous change of the waveform, it has good pulse agility, so it has very good low interception and anti-interference characteristics. At the same time, the noise radar signal has a "pushpin" ambiguity function, which makes it It has non-ambiguous ranging, speed measurement performance and good distance and speed resolution, and it also has excellent electromagnetic compatibility. [0003] However, ordinary noi...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the high PAPR existing in the past wideband noise radar signal, the transmitter efficiency is low, a large amount of energy is lost because of the excessive noise outside the band, and the technical problems that the A / D sampling rate is too high are required, Therefore, a chirp chaotic noise waveform with constant amplitude and good band-limit performance and its deskewing processing method are proposed, which realizes deskewing processing of wideband noise signals and reduces the requirement of wideband noise radar for A / D sampling rate

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