CN108710123A - A kind of triangle arm short-range detecting system tests the speed distance measuring method - Google Patents

A kind of triangle arm short-range detecting system tests the speed distance measuring method Download PDF

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Publication number
CN108710123A
CN108710123A CN201810483894.2A CN201810483894A CN108710123A CN 108710123 A CN108710123 A CN 108710123A CN 201810483894 A CN201810483894 A CN 201810483894A CN 108710123 A CN108710123 A CN 108710123A
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China
Prior art keywords
frequency
phase
fft
speed
detecting system
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CN201810483894.2A
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Inventor
赵惠昌
范婉华
范利光
刘倩云
邢娇
范聿杰
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Nanjing University of Science and Technology
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Nanjing University of Science and Technology
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Priority to CN201810483894.2A priority Critical patent/CN108710123A/en
Publication of CN108710123A publication Critical patent/CN108710123A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
    • G01S13/50—Systems of measurement based on relative movement of target
    • G01S13/58—Velocity or trajectory determination systems; Sense-of-movement determination systems
    • G01S13/583—Velocity or trajectory determination systems; Sense-of-movement determination systems using transmission of continuous unmodulated waves, amplitude-, frequency-, or phase-modulated waves and based upon the Doppler effect resulting from movement of targets
    • G01S13/584—Velocity or trajectory determination systems; Sense-of-movement determination systems using transmission of continuous unmodulated waves, amplitude-, frequency-, or phase-modulated waves and based upon the Doppler effect resulting from movement of targets adapted for simultaneous range and velocity measurements

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  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar Systems Or Details Thereof (AREA)

Abstract

It tests the speed distance measuring method the present invention relates to a kind of triangle arm short-range detecting system, using all phase Fourier transformation phase difference frequency measurement, Fourier transformation is carried out respectively to difference frequency signal and all phase Fourier transformation seeks phase, Fourier transformation frequency measurement is modified using phase difference, obtains the higher difference frequency of accuracy and Doppler frequency.The present invention utilizes the phase invariance of all phase Fourier transformation, is successfully modified to beat frequency, to improve the precision for ranging of testing the speed.

Description

A kind of triangle arm short-range detecting system tests the speed distance measuring method
Technical field
The present invention relates to short-range detecting technology, especially a kind of triangle arm short-range detecting system tests the speed distance measuring method.
Background technology
Currently, the advantages that linear frequency modulation short-range detecting system is small, simple in structure, precision is high, of low cost due to its, It is widely applied in every field.In actual signal processing, the resolution ratio and fence effect of FFT transform can be to systems The range accuracy that tests the speed impact.
Common lack sampling speed-measuring method is since needs balance the frequency accuracy of test the speed real-time and Doppler signal, in real time Property and rate accuracy are all restricted.FFT+CZT Measuring Frequency Methods can improve frequency accuracy, but the raising of precision is by FFT points and CZT Points influence, and increase points in the same frequency sweep time and not only need to improve sample rate, but also can increase data processing amount.
Invention content
It tests the speed distance measuring method the purpose of the present invention is to provide a kind of triangle arm short-range detecting system, linear adjust is turned up Test the speed range accuracy in frequency detection system.
Realize that the technical solution of the object of the invention is：A kind of triangle arm short-range detecting system tests the speed distance measuring method, It is characterized in that, includes the following steps：
All phase data prediction：Difference frequency signal is subjected to all phase data prediction, that is, uses convolution window wcTo with x (0) Centered on the data vector of length (2N-1) be weighted processing, then shift summation；
FFT surveys phase：FFT methods are utilized respectively to the pretreated data of all phase and untreated difference frequency data and measure primary spectrum Phase value on line；
Phase difference correction：Using the difference of the above-mentioned two phase value relationship directly proportional to frequency deviation value, signal frequency is obtained Estimation；
Upper and lower frequency sweep band frequency offsets：By upper and lower frequency sweep segment difference frequency signal frequency, calculate corresponding moment target range with Speed.
Further, all phase data prediction is to list all subdata vectors comprising x (0) of x (n), by all sons Data vector blocks position in original and carries out periodic extension, sums in the primary area blocked, obtains the new all phase period Continuation signal.
Further, for triangle-wave frequency modulation system, upper frequency sweep section beat frequency fpWith lower frequency sweep section beat frequency fq It is respectively present following correspondence with target range R：
Wherein Δ F is frequency deviation, TmFor frequency sweep cycle, R is target range, and c is electromagnetic wave propagation speed,For The Doppler frequency of target, v are target speed, and λ is carrier wavelength.
Further, FFT survey phase the specific steps are：
Single-frequency complex exponential sequenceN is the points of FFT, and m is the position where actual frequency, θ0It is actual phase value, it is assumed that the spectrum serial number k of main spectral line*, m=k*+ δ, δ are frequency shift (FS),
After x (n) carries out FFT, the phase value on FFT main spectral lines is:
After x (n) carries out whole phase FFT, the phase value on whole phase FFT main spectral line is:
Further, phase difference correction is specially：
The phase value that whole phase FFT obtains is subtracted into the phase value that FFT is obtained, can be obtained
The estimation of signal actual frequency：
Further, it is offseted by upper and lower swept frequency, eliminates the influence of Doppler, accurately measure target range and speed Degree：
Wherein f0For signal center frequency, μ is the frequency modulation rate of linear frequency modulation short-range detecting system,
Compared with prior art, the present invention have the advantage that for：(1) it by all phase Fourier transformation, can incite somebody to action To more accurate beat frequency and Doppler frequency, to reduce the error of frequency measurement ranging；(2) present invention is using all phase frequency Spectrum correction method carrys out frequency measurement, and ranging and range rate is offseted using upper and lower frequency sweep band frequency.
Description of the drawings
Fig. 1 is data processing broad flow diagram of the present invention.
Fig. 2 is whole phase FFT Phase Correction Method frequency measurement broad flow diagram.
Fig. 3 is range error figure of the present invention.
Fig. 4 is range rate error figure of the present invention.
Specific implementation mode
In conjunction with Fig. 1, Fig. 2, a kind of triangle arm short-range detecting system tests the speed distance measuring method, includes the following steps：
(1) all phase data prediction：Difference frequency signal is subjected to all phase data prediction, i.e., with a convolution window wcTo with The data vector of length (2N-1) centered on x (0) is weighted processing, then shifts summation.
(2) FFT surveys phase：FFT methods are utilized respectively to the pretreated data of all phase and untreated difference frequency data to measure Phase value on main spectral line.
(3) phase difference correction：Using the difference of the above-mentioned two phase value relationship directly proportional to frequency deviation value, signal frequency is obtained The estimation of rate.
(4) frequency sweep band frequency offsets up and down：By upper and lower frequency sweep segment difference frequency signal frequency, corresponding moment target range is calculated With speed.
Since FFT methods are difficult to break away from influence of the spectral leakage to frequency spectrum precision, it is difficult to ensure that required phase is accurate Property.On the basis of FFT methods, it is proposed that a kind of new Spectral Analysis Method --- whole phase FFT (all phase FFT, apFFT) Method.Signal is first carried out all phase data prediction by this method, carries out fft algorithm processing again later, the frequency spectrum point obtained with this The result of analysis has " phase invariance ", even the property means in " the case where data sampling asynchronous ", without any Additional corrective action can accurately extract signal phase value.
Single-frequency complex exponential sequenceN is the points of FFT, and m is the position where actual frequency, θ0 It is actual phase value, it is assumed that the spectrum serial number k of main spectral line*, m=k*+ δ,
After x (n) carries out traditional FFT, the phase on FFT is：
Phase value on main spectral line is:
After x (n) carries out whole phase FFT, the phase value on whole phase FFT main spectral line is:
Conventional phase spectrum is subtracted into all phase phase spectrum, can be obtained:
The phase spectrum of windowing FFT i.e. on main spectral line and the difference of whole phase FFT phase spectrum are directly proportional to frequency deviation value dw, Proportionality coefficient is group delay τ.As long as it means that measuring phase angle size of two kinds of spectrum analysis on main spectral line, take it poor Value, you can the estimation of shape pair signals actual frequency：
Linear frequency modulation short-range detecting system is believed by emitting chirped continuous wave signal according to echo-signal and transmitting Number beat frequency measure target range.For triangle-wave frequency modulation system, upper frequency sweep section and lower frequency sweep section beat frequency with Distance is respectively present following correspondence：
Wherein Δ F is frequency deviation, TmFor frequency sweep cycle, R is target range, and c is electromagnetic wave propagation speed,For The Doppler frequency of target.
The influence of Doppler can be eliminated by being offseted by upper and lower swept frequency, accurately measure target range and speed.
Wherein f0For signal center frequency, μ is the frequency modulation rate of linear frequency modulation short-range detecting system,
The present invention is further described in detail with reference to the drawings and specific embodiments.
Embodiment
The present embodiment uses following systematic parameter：Triangle-wave frequency modulation system, frequency sweep cycle Tm=8us, frequency deviation Δ F= 100MHz, target move distance 30m~10m, movement velocity 350m/s, difference frequency sample rate fs=100MHz.
As shown in Figure 1, the present invention includes the following steps：
(1) all phase data prediction：Difference frequency signal is subjected to all phase data prediction, i.e., with a convolution window wcTo with The data vector of length (2N-1) centered on x (0) is weighted processing, then shifts summation.
(2) FFT surveys phase：FFT methods are utilized respectively to the pretreated data of all phase and untreated data and measure primary spectrum Phase value on line.
(3) phase difference correction：Utilize the difference and frequency of phase spectrum and whole phase FFT phase spectrum on traditional FFT main spectral line The directly proportional relationship of bias, obtains the estimation of signal frequency.
(4) frequency sweep band frequency offsets up and down：By upper and lower frequency sweep segment difference frequency signal frequency, corresponding moment target range is calculated With speed.
The range error figure for the difference frequency signal that Fig. 3 is distance when being 30m, it is seen that this method possesses higher range accuracy.
The range rate error figure for the difference frequency signal that Fig. 4 is distance when being 30m, it is seen that this method possesses higher rate accuracy.

Claims (6)

  1. The distance measuring method 1. a kind of triangle arm short-range detecting system tests the speed, which is characterized in that include the following steps：
    All phase data prediction：Difference frequency signal is subjected to all phase data prediction, that is, uses convolution window wcTo centered on x (0) The data vector of length (2N-1) be weighted processing, then shift summation；
    FFT surveys phase：FFT methods are utilized respectively to the pretreated data of all phase and untreated difference frequency data to measure on main spectral line Phase value；
    Phase difference correction：Using the difference of the above-mentioned two phase value relationship directly proportional to frequency deviation value, estimating for signal frequency is obtained Meter；
    Upper and lower frequency sweep band frequency offsets：By upper and lower frequency sweep segment difference frequency signal frequency, corresponding moment target range and speed are calculated.
  2. The distance measuring method 2. triangle arm short-range detecting system according to claim 1 tests the speed, which is characterized in that all phase Data prediction is to list all subdata vectors comprising x (0) of x (n), and all subdata vectors are blocked position in original and are carried out Periodic extension sums in the primary area blocked, obtains new all phase periodic extension signal.
  3. The distance measuring method 3. triangle arm short-range detecting system according to claim 1 tests the speed, which is characterized in that for three Angle swash FM system, upper frequency sweep section beat frequency fpWith lower frequency sweep section beat frequency fqIt is respectively present with target range R following Correspondence：
    Wherein △ F are frequency deviation, TmFor frequency sweep cycle, R is target range, and c is electromagnetic wave propagation speed,For target Doppler frequency, v is target speed, and λ is carrier wavelength.
  4. The distance measuring method 4. triangle arm short-range detecting system according to claim 1 tests the speed, which is characterized in that FFT is surveyed Phase the specific steps are：
    Single-frequency complex exponential sequenceN is the points of FFT, and m is the position where actual frequency, θ0It is Actual phase value, it is assumed that the spectrum serial number k of main spectral line*, m=k*+ δ, δ are frequency shift (FS),
    After x (n) carries out FFT, the phase value on FFT main spectral lines is:
    After x (n) carries out whole phase FFT, the phase value on whole phase FFT main spectral line is:
  5. The distance measuring method 5. triangle arm short-range detecting system according to claim 1 tests the speed, which is characterized in that phase difference Correction is specially：
    The phase value that whole phase FFT obtains is subtracted into the phase value that FFT is obtained, can be obtained
    The estimation of signal actual frequency：
  6. The distance measuring method 6. triangle arm short-range detecting system according to claim 1 tests the speed, which is characterized in that by upper Lower swept frequency offsets, and eliminates the influence of Doppler, accurately measures target range and speed：
    Wherein f0For signal center frequency, μ is the frequency modulation rate of linear frequency modulation short-range detecting system,
CN201810483894.2A 2018-05-19 2018-05-19 A kind of triangle arm short-range detecting system tests the speed distance measuring method Pending CN108710123A (en)

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CN104375111A (en) * 2014-11-16 2015-02-25 甘肃省机械科学研究院 Rapid high-precision refining correction method for intensive frequency spectrum
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