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Improved phase comparison angle measurement method

An angle measurement and phase comparison technology, applied in radio wave measurement systems, instruments, etc., can solve problems such as large computational load, inaccurate phase information, and sudden change in measured angle, and achieve reduced computational load, accurate phase information, and direction. Excellent performance

Pending Publication Date: 2019-07-02
DALIAN ROILAND SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The angle measurement range of the phase comparison method is mainly related to the antenna spacing and the radar signal frequency. The existing angle measurement range is small. After exceeding a certain range, the measured angle changes suddenly, and certain compensation is required; and the phase information in the frequency spectrum is inaccurate. , the amount of calculation is large

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] This embodiment provides an improved method for measuring angles by phase comparison, including:

[0043] S1: Calculate the phase difference between the antenna elements

[0044] S2: Calculate the phase error signal P, and obtain the modulus value of the phase error signal P: details as follows:

[0045] Let the sum of the spectrum of the antenna be P1, and the difference of the spectrum be P2, the steps are as follows:

[0046] Sa. respectively performing FFT transformation on the time domain data received by the two antennas to obtain the signal spectrum;

[0047] Sb. Threshold detection is carried out to the spectrum information in Sa, and the position k in the spectrum where the target is obtained is obtained. When multiple targets are contained, k is an array;

[0048] Sc. adding and subtracting the value of position k in the frequency spectrum obtained in Sb, respectively, to obtain P1 and P2;

[0049] Sd. Divide P1 obtained in Sc by P2 to obtain the phase ...

Embodiment 2

[0053] This embodiment provides another improved method for measuring angles by phase comparison, including:

[0054] S1: Calculate the phase difference between the antenna elements

[0055] S2: Calculate the phase error signal P, and obtain the modulus value of the phase error signal P: details as follows:

[0056] SA. Adding and subtracting the time-domain data of the two receiving antennas respectively;

[0057] SB. performing FFT transformation on the time domain data obtained in SA respectively, to obtain spectrum P3 and spectrum P4;

[0058] SC. Carry out constant false alarm detection to the frequency spectrum P4 obtained by SB, and obtain the position k of the target in the frequency spectrum;

[0059] SD. respectively divide the values ​​corresponding to position k of P3 and P4 obtained in SB to obtain the phase error signal P;

[0060] The above P1, P2, P3, P4, P are all imaginary numbers.

[0061] S3: According to the phase difference between antenna element...

Embodiment 3

[0064] As a supplement to Embodiment 1 or 2: Assume that the time domain data of antenna I and antenna II are obtained by mixing the data obtained by the receiving antenna, and finally output the angle at which the target is located; let the distance between the two receiving antennas be d, the system The wavelength of the transmitted signal is λ, and the number of FFT transformation points is N_FFT, such as figure 1 As shown, d=M1M2 (representing the distance between M1 and M2, and so on), the angle of the target is α=∠AOY, the distance between the target and the receiving antenna 1 is R1=AM1, and the distance between the target and the receiving antenna 2 is R2 =AM2, the distance between the target and the center of the antenna is R=AO, then according to the law of cosines:

[0065]

[0066]Because d<

[0067]

[0068] Empathy

[0069]

[0070] The phase difference between the antenna ...

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Abstract

The invention discloses an improved phase comparison angle measurement method, which comprises steps: S1, a phase difference between antenna elements is solved; S2, a phase error signal P is solved toobtain a modulus value of the phase error signal P; S3, according to the phase difference between antenna elements and the modulus value of the phase error signal P, the absolute value of the calculated angle alpha is obtained; and S4, the imaginary part of P is judged, in the case of a negative number, the alpha is positive and alpha=|alpha|, and in the case of a positive number, the alpha=-|alpha|. By adding and subtracting time domain signals first, the phase information in a spectrum is more accurate, and the amount of calculation can be reduced while the system performance requirements are met.

Description

technical field [0001] The invention belongs to the field of antenna angle measurement, in particular to an improved method for phase comparison angle measurement. Background technique [0002] Angle measurement is to measure the pitch angle and azimuth angle of the target, which is an important part of target orientation and precise guidance. There are many existing radar angle measurement algorithms, such as amplitude comparison method, phase comparison method, array scanning angle measurement, single pulse angle measurement, super-resolution angle measurement and so on. The angle measurement range of the phase comparison method is mainly related to the antenna spacing and the radar signal frequency. The existing angle measurement range is small. After exceeding a certain range, the measured angle changes suddenly, and certain compensation is required; and the phase information in the frequency spectrum is inaccurate. , the amount of calculation is large. Contents of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41
CPCG01S7/41
Inventor 田雨农苍柏唐丽娜
Owner DALIAN ROILAND SCI & TECH CO LTD
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