A two-dimensional imaging method and system based on recursive structure beamforming
A recursive structure, two-dimensional imaging technology, used in radio wave measurement systems, radio wave reflection/re-radiation, instruments, etc., can solve problems such as unsatisfactory beam bandwidth, affecting signal reception, and poor beam forming effect, and achieve improvement. Resolution performance, extremely narrow beamwidth, and robustness
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example 1
[0140] Set up the simulation experiment as follows:
[0141] (1) Set the desired beam pattern parameters;
[0142] (2) Obtain the expected IIR parameters through space-time equivalence;
[0143] (3) The IIR filter coefficient is obtained by using FDATOOL design;
[0144] (4) The IIR coefficient is used as the corresponding beamforming coefficient;
[0145] (5) Calculate the beam response, analyze the two-dimensional beam pattern, and check the bandwidth and other characteristics.
[0146] Table 2 Beam pattern simulation parameters
[0147] parameter list parameter value Sampling Rate 4Hz The sampling period 0.25s signal wavelength 0.5m Azimuth and pitch (-π / 2,π / 2) Array element spacing 0.25m time domain filter center 0Hz Sampling points 256，1024，32768 Weighting coefficient 3.0869709262274656*10e-16 Feedback coefficient -0.99999999999999933
[0148] Table 3 Two-dimensional beamforming characteristic par...
example 2
[0152] Design two signals with very close incident angles, and design DBF (Digital Beam Forming, digital beam forming) to test the effect of spatial filtering. The filtering simulation parameters are shown in Table 4.
[0153] Table 4 Filter simulation parameters
[0154] parameter list parameter value Sampling points 512 input signal Sinusoidal signal Receive signal frequency 100HZ Interference signal frequency 300HZ direction of arrival 0° Interference Direction 1 1*pi / (1e16) Interference Direction 2 1*pi / (1e14)
[0155] Figure 13 It is the spectrogram of signals S1 and S2 with two very close incident angles, Figure 14 It is the comparison chart of S1 signal waveform before and after direction-of-arriving filtering, Figure 15 It is the comparison chart of S2 signal filtering (incomplete) signal in interference direction 1, Figure 16 It is a comparison chart of the S2 signal filtered (thoroughly) in the int...
example 3
[0158] When there are phase and element position errors, the wavelength varies between 500-100GHz, the signal bandwidth varies between 10-10000B, and the interference angle is 1.8×10 -28° ~18°, the signal-to-noise ratio varies between -100-50dB, which proves the robustness of the recursive structure beamforming, and can form extremely narrow beams for spatial filtering.
[0159] The present invention also provides a two-dimensional imaging system based on recursive structural beamforming. The system includes:
[0160] The radar echo signal acquisition module is used to receive the signal transmitted by each scattering point on the target to be imaged through the radar system, as the radar echo signal of each scattering point;
[0161] The deflection azimuth and deflection pitch determination module is used to determine the deflection azimuth and deflection pitch of each scattering point according to the radar echo signal of each scattering point;
[0162] The airspace paramet...
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