Radar pulse transmitter and generation method of orthogonal frequency division multiplexing (OFDM) pulse signal

Abstract

The invention belongs to the field of pulse transmitters of radar systems and particularly relates to a generation method of an orthogonal frequency division multiplexing (OFDM) pulse signal and a radar transmitter generating radar signals through the method. The method aims to solve the technical problem of how to enable the radar transmitter to output an expected complicated radar signal waveform, wherein the waveform has a low intercept probability and a low envelope peak-to-average ratio, the number of sub-carrier frequencies is at will and the coding length is at will. The method is technically characterized by including the steps that a coding sequence at any length is constructed based on a Bernoulli chaos; the sub-carrier frequencies at any number are modulated; the envelope peak-to-average ratio is reduced through sub-carrier frequency initial phase weighting, and then the phase encoding OFDM signal is obtained.

Description

Technical field [0001] The invention belongs to the field of pulse transmitters of radar systems, and particularly relates to a radar pulse transmitter and a method for generating an orthogonal frequency division multiplexing pulse signal. Background technique [0002] The radar system is mainly composed of antennas, transmitters, receivers, signal processors and terminal equipment. Among them, the radar transmitter is an important component of the radar system, and its main function is to generate pulse power with the required intensity of radiation. At present, radar transmitters are usually divided into pulse modulated transmitters and continuous wave transmitters. The most widely used is pulse modulated transmitter, whose waveform is pulse width τ and repetition period T r High frequency pulse train. The diversity and complexity of the electromagnetic environment of the modern battlefield determines that an important requirement of radar transmitters is to output a variety o...

AI Technical Summary

Problems solved by technology

Since each transmitted pulse signal of the COFDM signal generates a chaotic sequence according to different initial conditions and mapping rules, different pulse signals have orthogonality. Therefore, using this signal for imaging radar can obtain a low intercept probability and at the same time It has superior performance in anti-interference, anti-fading, suppression of multipath and clutter interference, etc., but the current research on this kind of signal is not systematic and in-depth enough, and there is still a long way to go from practical application

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