Spectrum pairing method and pairing system based on beamforming
A beam and spectrum technology, applied in the field of spectrum pairing method and pairing system based on beamforming, can solve the problems of prone to errors and large amount of calculation, and achieve the effect of ensuring accuracy, symmetric spectrum suppression, and shortening the amount of calculation.
Active Publication Date: 2021-10-08
NANJING UNIV OF SCI & TECH
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Problems solved by technology
In order to cope with the complex situation of the road, multi-objective data processing needs to be considered. For the case of multi-objective FFT spectrum with multiple spectral peaks, spectrum pairing is required to select the correct spectral peak. Traditional spectrum pairing determines the spectral peak by calculating the beat amplitude spectral area. , this method has a large amount of calculation and is prone to errors when two target echoes are similar
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[0036] (1) The antenna array of the present embodiment is a 6-element uniform line array, and the array element spacing Sampling frequency F s =40KHz, in the case of multiple targets, the target-distance R 1 = 30m, speed v 1 =2m / s, direction angle θ 1 = 10°, target 2 R 2 = 40m, v 2 =10m / s, θ 2 =-25°. The center frequency of the transmitted signal is 24.05GHz, the bandwidth is 100MHz, and the linear frequency modulation triangle wave with a total duration of 20ms; the signal-to-noise ratio is 10dB. When the target moves close to the radar, v is a positive number; when it moves away from the radar, v is a negative number.
[0037] (2) Perform frequency mixing processing on the received signal, and obtain an intermediate frequency sampling signal after down-conversion, and the number of sampling points is 800.
[0038] (3) Carry out 400-point Fourier transform on the up-sweep frequency data and down-sweep frequency data of the signal, and calculate the upper-sweep freque...
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The invention relates to a spectrum pairing method and a pairing system based on beam forming. The beam forming principle is utilized, and based on the characteristic of consistent angle information on the spectral peaks corresponding to the target, beam forming is performed on the FFT spectrum through weight vector coefficients, that is, in-phase data superposition, The out-of-phase data is suppressed, so it can highlight the spectral peaks at the target angle, that is, the spectral peaks corresponding to the target, so as to calculate the speed and distance. The invention not only has the characteristics of simple structure, low cost and good robustness of the real signal system, but also can select the correct single peak to suppress the wrong spectrum through spectrum pairing.
Description
technical field [0001] The invention relates to spectrum pairing technology, in particular to a beamforming-based spectrum pairing method and pairing system. Background technique [0002] The number of cars in our country is increasing year by year, and the problem of road traffic safety is becoming more and more prominent. In order to prevent traffic accidents and improve traffic safety, on-board radar has become one of the important means to ensure safe driving. At home and abroad, millimeter-wave radar collision avoidance systems have been studied. The on-board radar has the functions of speed measurement, distance measurement and angle measurement, which can judge the threat to the vehicle from the target in front and remind the driver to pay attention to safety in time. [0003] In order to realize the miniaturization and commercialization of the anti-collision radar, the linear frequency modulation continuous wave (LFMCW) system is generally adopted, and the target d...
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IPC IPC(8): G01S7/02
CPCG01S7/02
Inventor 缪晨沈俊逸吴文季晓宇邵鸿旭杨榛赵阳莹
Owner NANJING UNIV OF SCI & TECH