Automobile active anti-collision radar based on pseudorandom code and linear frequency modulated continuous wave

Abstract

The invention relates to an automobile active anti-collision radar based on pseudorandom code and linear frequency modulated continuous wave, belonging to the field of automobile radar, comprising a pseudorandom code and linear frequency modulated control signal generator, a pseudorandom code and linear frequency modulated continuous wave emitter, a sending antenna, a receiving antenna, a low-noise amplification mixed frequency receiving channel, a linear frequency modulated signal processing and pseudorandom code multi-path parallel correlation processor, a parallel data processor and an executing terminal. The pseudorandom code is used for modulating the phase of radar carrier wave and performing linear frequency modulation to the radar carrier wave so as to form a double-modulation emitting signal. Two systems are combined, so that the inhibition ability of interference echo is improved; the false alarm caused by false targets is removed; different codes of different automobile radars are achieved; the interference caused by the automobile radar is removed; the detection ability of the active anti-collision radar is improved; the false alarm rate is improved; and the inhibitionability under complex road condition is good.

Description

technical field [0001] The invention relates to an automobile active anti-collision radar, especially an automobile active anti-collision radar based on pseudo-random coding and linear frequency modulation continuous wave, which belongs to the field of automobile radar and is used to detect vehicles, obstacles and other targets in front of the automobile, and to Prompts and warnings to achieve safe driving of the car and reduce accidents caused by the driver's inability to detect objects in front of the car early. Background technique [0002] At present, the ranging signal systems that are widely studied and applied in automotive active collision avoidance radar mainly include pseudo-random coding, linear frequency modulated continuous wave (LFMCW), and pseudo-random coding systems. [0003] The LFMCW system radar is the mainstream of the existing automotive active collision avoidance radar due to its relatively simple implementation and better range resolution. As describ...

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Problems solved by technology

However, these methods increase the frequency range of the system, and the corresponding calculation time will increase, which will adversely affect the real-time performance of automobile collision avoidance occasions.

[0004] In addition, the LFMCW system automotive anti-collision radar has a wide operating frequency band, and the correctness and accuracy of detecting targets depends on the extraction of the intermediate frequency signal after mixing at the receiving end. In this way, various noises and interferences are inevitably mixed into the echo, which is It will affect the performance of radar detection target and the effect of car collision avoidance

[0005] Pseudo-random coded continuous wave radar has been studied in other fields in recent years. The commonly used m-sequence pseudo-random coded phase-modulated continuous wave system has strong anti-interference ability, and the "pushpin" fuzzy map can achieve high-precision measurement. However, the existence of non-correlated sidelobes limits the wider application of this system

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