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A Frequency Measurement Method for Precision Measurement Radar Based on Frequency Offset Classification

A precision measurement and radar technology, applied in radio wave measurement systems, instruments, etc., to solve problems such as frequency estimation errors and sub-maximum judgment errors

Active Publication Date: 2018-01-12
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

From step 3, we can see that if the measurement is in a noisy environment, the signal sequence with a small frequency deviation will have the phenomenon of determining the second largest value incorrectly, resulting in an error in frequency estimation. In order to prevent this from happening, this paper proposes a classification based on frequency deviation Precise Measurement Radar Frequency Measurement Method

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  • A Frequency Measurement Method for Precision Measurement Radar Based on Frequency Offset Classification
  • A Frequency Measurement Method for Precision Measurement Radar Based on Frequency Offset Classification
  • A Frequency Measurement Method for Precision Measurement Radar Based on Frequency Offset Classification

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Embodiment Construction

[0023] A precision measurement radar frequency measurement method based on frequency offset classification, the method comprising:

[0024] Step 1: Mix the echo and the launch wave and pass through the filter to obtain the difference frequency signal;

[0025] Step 2: Perform FFT on the difference frequency signal to obtain the maximum amplitude X(k 0 ) and the second largest value X(k 0 +r);

[0026] When X(k 0 +1)>X(k 0 -1), r=1; when X(k 0 +1)≤X(k 0 -1), r=-1;

[0027] Step 3: Utilize the formula:

[0028]

[0029] Obtain the spectrum shift value Δk; use the formula:

[0030]

[0031] Get the estimated frequency f 1 ; where: f s Indicates the sampling frequency, N indicates the number of FFT points;

[0032] Step 4: Obtain the comparison frequency f 0 :f 0 = f s .k / N(k∈[1,N]);

[0033] Step 5. If|f 1 -f 0 |e = kΔf;

[0034] If|f 1 -f 0 |>0.2Δf,f e = f IF ,

[0035] If 0.2Δf≥|f 1 -f 0 |≥0.02Δf, use y(n)=x(n).exp[j2πnr(1 / 2-Δk) / N] as FFT to get t...

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Abstract

The invention discloses a precision measurement radar frequency measurement method based on frequency offset classification, and relates to the precision measurement radar frequency measurement field. The method obtains the frequency shift of the radar signal based on the frequency offset classification method, and compares the frequency shift with a reference threshold. The size of the reference threshold is related to the second maximum value and the maximum value of the radar signal amplitude, and is not a fixed value; according to The amount of frequency shift determines the frequency of the calculation center; using spectrum translation to move away from the center of the main lobe to improve measurement accuracy; when the frequency deviation is small, directly use FFT to measure the frequency. Compared with the existing methods, the method has obvious improvement in measurement accuracy and stability.

Description

technical field [0001] The invention relates to the field of precision measurement radar frequency measurement. Background technique [0002] At present, precision measurement radar frequency measurement methods are very mature, including RIFE, energy center of gravity method, and FFT refinement method. The traditional ratio method has the advantages of high frequency measurement accuracy, less calculation, and easy implementation, so it has become the most widely used precision measurement radar frequency measurement method in engineering. The steps of the traditional ratio method are: Step 1. After mixing and filtering the echo and the transmitted wave, the difference frequency signal is obtained; Step 2. After performing FFT on the difference frequency signal, the maximum amplitude value X(k) and the second maximum value X(k) are obtained. k+r), r is ±1; Step 3. Obtain the estimated frequency through the position of the FFT maximum value and the relationship between the ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/40
CPCG01S7/40
Inventor 周云兰杰朱晓芳王晖邹林
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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