Vehicle-mounted millimeter-wave radar moving target recognizer and recognition method

Abstract

The invention discloses a vehicle-mounted millimeter-wave radar moving target recognizer. The vehicle-mounted millimeter-wave radar moving target recognizer is characterized in that the recognizer is a frequency synthesizer; a frequency agility continuous signal is modulated into a pulse signal and then is processed into a millimeter-wave signal by up-conversion; after being amplified by a power amplifier, the millimeter-wave signal is transmitted out; an antenna receives a radar echo signal back to a circulator and then the signal is transmitted into a frequency mixer; a high-frequency echo pulse and constant-amplitude high-frequency voltage generated by a high-stability local oscillator are mixed and the signal is reduced to a middle frequency and then is processed by a middle-frequency amplifier; the middle-frequency signal is directly sampled by an A / D (Analogue / Digital) conversion module; after being sampled, echo signals of a whole pulse string are stored into a storage unit; and information of targets, such as quantity, speed and direction, is measured by a signal processing unit and then is transmitted to an alarm executing unit. With the adoption of the structure, the vehicle-mounted millimeter-wave radar moving target recognizer has the advantages that 1 the distance measuring precision and the angle measuring precision of a moving target are improved; and 2 excessive hardware does not need to be added and the production cost is lower.

Description

technical field [0001] The invention relates to a millimeter-wave radar, in particular to a vehicle-mounted millimeter-wave radar moving target recognizer and a recognition method. Background technique [0002] The existing vehicle-mounted millimeter-wave radars all use the frequency-modulated continuous wave (FMCW) system. In this method, the number and speed of the target are calculated from the received target echo by transmitting the frequency-modulated continuous wave signal in the millimeter wave band. The modulation waveform generator controls the modulation oscillator to generate the FMCW signal, which is transmitted to the antenna through the directional coupler, and the receiving antenna receives the radar echo and transmits it to the mixer, and then generates an intermediate frequency signal through mixing and filtering, and the intermediate frequency signal passes through the A / D After sampling, it is sent to the digital chip for processing and calculation, and ...

AI Technical Summary

Problems solved by technology

The resulting A / D sampling necessary for digital processing is difficult to achieve; in addition, at short distances, the pulse width of the transmitted signal is limited, and it is also difficult to modulate a large bandwidth in a short time

If a larger frequency offset B is obtained by increasing the time width T, it is bound to increase the radar transmission power

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