Saw-tooth wave distance measuring and speed measuring method based on 77GHz millimeter wave radar

A technology of millimeter-wave radar and sawtooth wave, applied in the field of antennas, can solve the problems of low signal processing performance, slow speed, long wavelength, etc.

Inactive Publication Date: 2018-02-13
上海莫吉娜智能信息科技有限公司
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Problems solved by technology

The modulation method of triangular wave is generally called slow FMCW. This method obtains the distance and speed of the target at the same time, but the wavelength is longer and the speed is slower. It is generally used in traditional systems with lower sig

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  • Saw-tooth wave distance measuring and speed measuring method based on 77GHz millimeter wave radar
  • Saw-tooth wave distance measuring and speed measuring method based on 77GHz millimeter wave radar
  • Saw-tooth wave distance measuring and speed measuring method based on 77GHz millimeter wave radar

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Embodiment Construction

[0038] Below by embodiment the present invention will be further described, and its purpose is only to understand research content of the present invention better but not limit protection scope of the present invention.

[0039] First refer to the following figure 1 Introduce the time-frequency diagram of the sawtooth transmitted signal. Such as figure 1 As shown, the i-th (i=1,2,...,N Sa ) frequency sweep period to transmit signal:

[0040]

[0041] In the formula, A is the amplitude of the transmitted signal, f 0 is the center frequency of the carrier, is the initial phase, μ=B / T is the sweep slope, B and T are the sweep bandwidth and the upper sweep period respectively, N sa is the number of sawtooth waves in one coherent processing cycle.

[0042] Considering that at time t=0, there is a target with a distance of r and a speed of v (the radial velocity of the target relative to the radar, the direction closer to the radar is positive) in front of the radar, then ...

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Abstract

The invention provides a saw-tooth wave distance measuring and speed measuring method based on a 77GHz millimeter wave radar. The saw-tooth wave distance measuring and speed measuring method comprisesthe following steps: a. transmitting same frequency modulation continuous saw-tooth wave transmitting signals by Nt transmitting antennas in sequence and forming a virtual array; b. receiving echo signals of the transmitting signals by Nt receiving antennas and forming a virtual array YV which belongs to CNtNr*Ns*Nsa1, wherein Ns is equal to fsT and Nsa1 is a transmitting period; c. carrying outwindowing FFT (Fast Fourier Transform) on each transmitting period and a receiving signal of each antenna to obtain YVF which belongs to CNtNr*NqFFT*Nsa1, wherein NqFFT is a rapid time dimension FFT point number; d. carrying out slow time dimension FFT on receiving signals of different distance units of each receiving antenna to obtain YVFF which belongs to CNtNr*NqFFT*NsFFT, wherein NsFFT is a slow time dimension FFT point number; e. carrying out phase compensation on each distance-speed unit of the YVFF to obtain YVFFC which belongs to CNtNr*NqFFT*NsFFT; f. carrying out beam forming on all the distance-speed units to obtain Z which belongs to CNqFFT*NsFFT; g. carrying out constant false alarm CFAR detection on data obtained by the beam forming to obtain a constant false alarm detection result; h. substituting the constant false alarm detection result into an equation to obtain a speed v and a distance parameter r.

Description

technical field [0001] The invention relates to the field of antennas, in particular to a sawtooth wave ranging and speed measuring method based on a 77GHz millimeter wave radar. Background technique [0002] Millimeter-wave radar is currently widely used in the field of traffic detection, and 77GHz millimeter-wave radar has a great advantage in terms of volume, detection accuracy and detection distance, because the 77GHz radar microstrip antenna is easier to Narrow beam and high gain are achieved with a small antenna volume. Because of these characteristics, 77GHz-based millimeter-wave radars will become standard for active safety. At present, the known and mature 77GHz millimeter-wave radar solutions are all from foreign suppliers, and domestic universities and suppliers have little research on this aspect. At present, domestic related companies and colleges mainly focus on the research on radar algorithm research on the triangle wave scheme, and mainly have the followin...

Claims

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Application Information

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IPC IPC(8): G01S13/58G01S13/34
CPCG01S13/343G01S13/584
Inventor 曹秀英
Owner 上海莫吉娜智能信息科技有限公司
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