JP2018081089A - Information extraction device and article detection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an information extraction device and an article detection device.SOLUTION: The information extraction unit includes: a transmit/receive unit for alternately transmitting two transmit signals to a target article and receiving two reflected signals that are the transmit signals reflected by the target article; a first processing unit for performing frequency mixing process on the two reflected signals and the two transmit signals, respectively, and obtaining two corresponding baseband signals; and a second processing unit for eliminating, on the basis of the two baseband signals, a first phase change due to the distance from the transmit/receive unit to the target article from the phase changes of the transmit signals and the received reflected signals, and ascertaining a second phase change F due to the target article.SELECTED DRAWING: Figure 1

Description

  The present invention relates to the field of communication technology, and in particular, to an information extraction method and apparatus, and an item detection method and apparatus.

  In recent years, safety issues in public places have become more and more important, and how to detect dangerous materials such as regulatory instruments, flammable and explosive materials has become an important issue. At present, devices for detecting dangerous goods are widely applied to places where personnel are crowded, such as airports, train stations, subway stations, and gymnasiums. Hazardous material detection devices can be divided into two main types, namely contact type and non-contact type. The contact-type detection device needs to detect a suspicious object (for example, a bottle containing liquid) by placing it on the detection device, and the non-contact type detection device moves the suspicious object within a predetermined range to the detection device. When this occurs, the detection function can be activated to detect whether the suspicious object is a dangerous substance.

  At present, in the case of a non-contact type detection apparatus, one of the common detection methods is an X-ray detection method. However, such a method is usually expensive and may adversely affect the health of workers when used for a long time. There is also a method for detecting a product based on the intensity of the reflected signal by transmitting a signal to the target product. However, such methods cannot distinguish between similar items when the dielectric constants of the items are close to each other.

  An object of the present invention is to accurately extract a phase change amount (F value) due to reflection of different target product surfaces, thereby eliminating the influence on the phase change amount calculation due to a minute change in detection distance. It is to provide an extraction method and apparatus.

  Another object of the present invention is to detect the product based on the phase change amount by the target product, thereby solving the problem that the product cannot be accurately detected because the dielectric constants are close to each other and improving the detection accuracy. Another object of the present invention is to provide an article detection method and apparatus capable of improving convenience, reducing the detection time and reducing the detection cost by such a non-contact detection method.

According to a first aspect of an embodiment of the present invention, an information extraction device is provided, the device comprising:
A transmission / reception unit for alternately transmitting two transmission signals, which are continuous waves having different frequencies, to a target product, and receiving two reflected signals after the transmission signal is reflected by the target product. Of these, the phase change amount of the reflected signal and the transmission signal is the first phase change amount due to the distance (D) from the transmission / reception unit to the target item, and the second phase change amount (F) due to the target item. And the second phase change amount of the two transmitted signals and the received reflected signal is the same;
A first processing unit that performs frequency mixing on the two reflected signals and the two transmission signals to obtain two corresponding baseband signals; and based on the two baseband signals A second processing unit for removing the first phase change amount from the phase change amount and determining the second phase change amount, whereby a target product is obtained using the second phase change amount. Including those that detect

According to a second aspect of an embodiment of the present invention, an article detection device is provided, of which the device is
A transmission / reception unit for alternately transmitting two transmission signals, which are continuous waves of different frequencies, to a target item, and receiving two reflected signals after the transmission signal is reflected by the target item; and A detection unit for detecting the target product on the basis of a phase change amount (F) by the target product, wherein F is a phase change amount obtained after processing the two reflected signals. Including some.

  The beneficial effects of the embodiment of the present invention are as follows, that is, by using the information extraction method and apparatus of the present embodiment, transmission signals of two different frequencies are alternately transmitted to the target product, and the reflected signal and the transmission are transmitted. By removing the first phase change amount due to the distance from the transmission / reception unit to the target product from the phase change amount of the signal and determining the second phase change amount (F) by the target product, it is due to the reflection of the surface of the different target product. By extracting the phase change amount, the influence of the minute change in the distance between the target product and the transmission / reception unit on the phase change amount value calculation is eliminated, and an accurate F value can be obtained.

  In addition, the beneficial effects of the embodiment of the present invention are as follows, that is, based on the phase change amount of the reflected signal and the transmission signal due to the reflection of the target object surface by the product detection method and apparatus of this embodiment. By detecting the product, it is possible to solve the problem that the product cannot be accurately detected because the dielectric constants are close to each other, improve the detection accuracy, and improve the convenience by such a non-contact detection method. The detection time can be shortened and the detection cost can be reduced.

1 is a diagram illustrating an information extraction device in Embodiment 1. FIG. FIG. 3 is a diagram illustrating a CW2 working mode in the first embodiment. FIG. 3 is a diagram showing an article detection apparatus in Example 2. FIG. 3 is a diagram showing an article detection apparatus in Example 2. 6 is a diagram illustrating a detection unit in Embodiment 2. FIG. FIG. 10 is a diagram illustrating a hardware configuration of an information extraction device according to a third embodiment. FIG. 6 is a diagram illustrating a hardware configuration of an article detection device in Example 4. 10 is a flowchart of an information extraction method in Embodiment 5. 10 is a flowchart of an item detection method in Embodiment 6. 10 is a flowchart of an article detection method in Embodiment 6. FIG. 10 is a diagram showing an article detection system in Example 7.

  Hereinafter, preferred embodiments for carrying out the present invention will be described in detail with reference to the accompanying drawings. In addition, embodiment disclosed below is only an illustration and does not limit this invention.

  In addition, for the sake of clarity, in the embodiments of the present invention, transmission of microwave signals is described as an example. However, it should be understood that the embodiments of the present invention are not limited to transmission of microwave signals.

  The first embodiment provides an information extraction device. FIG. 1 is a diagram illustrating a configuration of the information extraction device. As shown in FIG. 1, the apparatus 100 includes:

Transmission / reception unit 101: alternately transmits two transmission signals to a target item, the two transmission signals are continuous waves of different frequencies, and two reflections after the transmission signal is reflected by the target item A phase change amount of the reflected signal and the transmission signal includes a first phase change amount due to a distance from the transmission / reception unit 101 to the target item, and a second phase change amount due to the target item; The second transmitted signal and the received reflected signal have the same second phase change amount;
First processing unit 102: performs frequency mixing processing on the two reflected signals and the two transmission signals, respectively, to obtain two corresponding baseband signals;
Second processing unit 103: removing the first phase change amount from the phase change amount based on the two baseband signals, and determining the second phase change amount, thereby obtaining the second phase change amount. To detect the target product.

  By the above-described apparatus of the present embodiment, transmission signals of two different frequencies are alternately transmitted to the target product, and the distance from the transmission / reception unit to the target product (referred to as a detection distance) is determined from the phase change amount of the reflected signal and the transmission signal. The first phase change amount is removed, and the second phase change amount (F) due to the target product is determined. As a result, the phase change amount due to the reflection of the surface of the different target product can be extracted, the influence on the phase change value calculation due to the minute change in the detection distance can be eliminated, and an accurate F value can be obtained.

  In this embodiment, the transmission / reception unit 101 has a function of transmitting and receiving signals, and may be realized by a microwave sensor. For example, the transmission / reception unit 101 is a microwave sensor using Doppler radar technology. Doppler radar is one of the important long-distance non-contact sensing technologies, which collects information about the target item to be detected using the Doppler effect. Doppler radars typically work at relatively high pulse frequencies, eg, 24.05 MHz to 24.25 MHz, and have pulse radar distance resolution and continuous wave radar velocity resolution. The Doppler radar echo (return wave) contains a large amount of information such as the amplitude, phase, and frequency shift of the received signal. The Doppler radar sensor has three working modes: CW1 (single frequency) mode, CW2 (dual frequency) mode and frequency modulated continuous wave (FMCW) mode.

In this embodiment, the two transmission signals having different frequencies may be periodic. FIG. 2 is a diagram illustrating a transmission signal in the CW2 mode. As shown in FIG. 2, the sensor working in the CW2 mode alternately transmits a periodic continuous wave having _two different frequencies f ₁ and f ₂ and two reflected signals after being reflected by the target product. Receive.

In this embodiment, a microwave sensor in the CW2 mode using Doppler radar technology may be used as the transmission / reception unit 101, which is a periodic microwave having _two different frequencies f ₁ and f ₂ as a target product. After the transmission signal arrives at the target item, the transmission / reception unit 101 receives the two reflected signals after being reflected by the target item surface, but this embodiment is limited to this. Not. The transmission / reception unit 101 may further be a microwave device working at 27 GHz to 40 GHz in the Ka band, or the transmission / reception unit 101 may be a terahertz device. Is omitted.

  In this embodiment, since the materials of different target products are different, a phase change amount (referred to as a second phase change amount) may occur after the transmission signal is reflected by the target product. The second phase change amount of the same target product of different signals is the same. Further, the distance D between the transmission / reception unit 101 and the target product can also cause a phase change amount (referred to as a first phase change amount) between the transmission signal and the reflected signal.

  Therefore, in this embodiment, the amount of phase change between the received reflected signal and the transmitted signal is the first phase change amount due to the distance D from the transmission / reception unit 101 to the target item, and the second phase change amount due to the target item. The second phase change amounts of the two transmission signals and the two reflection signals by the same target product are also the same.

In this embodiment, for example, two transmission signals are transmitted alternately, that is, the wavelengths of the first transmission signal T ₁ (t) and the second transmission signal T ₂ (t) are λ ₁ and λ ₂ , respectively. Yes, the frequencies are f ₁ and f ₂ , respectively, and f ₁ and f ₂ are different.

T ₁ (t) and T ₂ (t) are expressed using the following formulas (1) and (2), respectively.

Of these, ψ ₀ is the initial phase, and in the present embodiment, the first transmission signal and the second transmission signal are described as an example by way of example, but the present embodiment is not limited to this. Instead, the first transmission signal and the second transmission signal may be other types of signals, such as a sine signal.

The received signals obtained after the above-mentioned two transmitted signals are reflected by the target product are the first reflected signal R ₁ (t) and the second reflected signal R ₂ (t), respectively, and the following formula R ₁ (t) and R ₂ (t) are represented using (3) and (4), respectively.

In the above formulas (3) and (4), ψ ₁ is the amount of phase change between T ₁ (t) and R ₁ (t), which is the first phase due to the distance D between the transceiver unit 101 and the target item. A change amount −2π (2D / λ ₁ ) and a second phase change amount F due to reflection of the target product surface, and ψ ₂ is a phase change amount of T ₂ (t) and R ₂ (t), It includes a first phase change amount −2π (2D / λ ₂ ) due to a distance D between the transmission / reception unit 101 and the target product, and a second phase change amount F due to reflection of the target product surface, and ψ ₁ and ψ ₂ are These are expressed by the following formulas (5) and (6), respectively.

  The inventor of the present invention has discovered the following. That is, when measuring the distance D between the transmission / reception unit 101 and the target product, a minute error may occur, and the formula (5) or (6) is calculated based on the measured distance D and the wavelength of the transmission signal. The value of F obtained when used alone to calculate F is inaccurate.

In this embodiment, two received reflected signals R ₁ (t) and R ₂ (t) are processed, and the first phase change amount due to the distance D from the transmission / reception unit 101 to the target product from ψ ₁ and ψ _2. By removing −2π (2D / λ ₁ ) and −2π (2D / λ ₂ ), the second phase change amount F due to the target product is determined. As a result, the amount of phase change due to reflection on the surface of different target items is extracted, the influence on the phase change amount calculation due to the minute change in the distance D between the target item and the transmission / reception unit is eliminated, and an accurate F value is obtained. be able to.

In this embodiment, the first processing unit 102 divides the two reflected signals R ₁ (t) and R ₂ (t) and the corresponding two transmitted signals T ₁ (t) and T ₂ (t). each perform frequency mixing processing for, acquires corresponding two baseband signals B ₁ (t) and B ₂ (t), formula such as the following (7) and respectively (8) B ₁ (t) And B ₂ (t).

In the present embodiment, the second processing unit 103 includes the phases ψ ₁ = 2k ₁ π + φ ₁ and ψ ₂ = 2k ₂ π + of the _two baseband signals B ₁ (t) and B ₂ (t), respectively. φ ₂ is calculated, and the following formulas (9) and (10) can be obtained based on formulas (5) and (6).

In one implementation, when using the Doppler radar sensor described above, the baseband signal obtained after frequency mixing is two orthogonal I and Q signals, and φ ₁ and φ ₂ are respectively It can be calculated by formulas (11) and (12).

は、第１ベースバンド信号を構成する２つの直交信号であり、
（外２）

は、第２ベースバンド信号を構成する２つの直交信号である。 In formulas (11) and (12),
(Outside 1)

Are two orthogonal signals constituting the first baseband signal,
(Outside 2)

Are two orthogonal signals constituting the second baseband signal.

In the present embodiment, the second processing unit 103 may further calculate the phases φ ₁ and φ ₂ of the baseband signal by another conventional method, but an exhaustive description is omitted here.

In the present embodiment, the second processing unit 103 may adopt the following method to remove the first phase change amount, that is, φ ₁ and φ based on the formulas (11) and (12). ₂ and substituting φ ₁ and φ ₂ into formulas (9) and (10) respectively, multiplying the left and right sides (both sides) of the equal sign of formula (9) by wavelength λ ₁ respectively, By multiplying the left and right sides (both sides) of the equal sign by the wavelength λ ₂ and subtracting the two formulas, D can be eliminated, thereby eliminating the first phase change amount. The second phase change amount F can be obtained as shown in the following formula (13).

In the formula (13), the meanings of φ ₁ and φ ₂ , λ ₁ and λ ₂ are the same as described above, and k ₁ and k ₂ are undetermined coefficients.

In this embodiment, k ₁ and k ₂ are all integers and have a piecewise linear relationship, and the relationship between k ₁ and k ₂ is the distance D and between φ ₁ and φ ₂ Related to the relationship between.

In one implementation, as shown in FIG. 1, the apparatus 100 may further include a determination unit 104 (optional), which is based on the distance D and the relationship between φ ₁ and φ _2. , Determine the relationship between k ₁ and k ₂ .

Among them, when _{φ 1 -φ 2> 0, k} 1 = be k ₂ + m-1; when φ ₁ -φ ₂ <0, be a k ₁ = k ₂ + m; wherein m is the distance And the value of m is a positive integer based on the distance D and a range of several (a plurality of) step-related sections with respect to the distance D.

を得ることができる。よって、所定の、距離に関する区間の範囲を用いて、前記mの値を確定する。前記区間の範囲は、所定のステップ長さに基づいて段階的に変化し、前記ステップ長さは、c/2(f₂-f₁)であり、そのうち、cは、光速である。例えば、前記段階的に変化する区間の範囲は、
（外３）

と表され、mは、調整係数であり、その値は、正整数である。 In this example, when determining the value of m, considering that the above distance D may not be accurately measured, based on the above formulas (9) and (10),

Can be obtained. Therefore, the value of m is determined using a predetermined range of distance-related sections. The range of the section changes stepwise based on a predetermined step length, and the step length is c / 2 (f ₂ -f ₁ ), where c is the speed of light. For example, the range of the section that changes stepwise is:
(Outside 3)

Where m is an adjustment factor and its value is a positive integer.

の範囲内にある場合、m=1と確定することができ、また、Dが、
（外５）

の範囲内にある場合、m=3と確定することができる。なお、以上は、例示的な説明に過ぎず、また、ここでは、網羅的な記載を省略する。 The following describes how to determine the value of m based on the distance D and a predetermined range of a number of steps that change in a stepwise manner with respect to the distance. For example, after measuring the approximate distance D and calculating the step length c / 2 (f ₂ -f ₁ ), it is determined which interval the distance D is within, and thus m The value of can be determined. For example, the distance D is
(Outside 4)

Can be determined as m = 1, and D is
(Outside 5)

Can be determined as m = 3. Note that the above is merely an exemplary description, and an exhaustive description is omitted here.

の範囲内にある場合、m=1であり、φ₁-φ₂>0の時に、k₁=k₂+1-1=kであるため、公式（13）は、次のような公式（14）に簡略化することができる。

In one implementation, the measured distance D is
(Outside 6)

If m = 1 and φ ₁ -φ ₂ > 0, then k ₁ = k ₂ + 1-1 = k, so formula (13) is 14) can be simplified.

又は

そのうち、kは、整数である。 Since k ₁ = k ₂ +1 when φ ₁ −φ ₂ <0, the formula (13) can be simplified to the following formula (15).

Or

Of these, k is an integer.

の範囲内にある時にのみ公式（13）を公式（14）及び（15）に簡略化することを例として如何にFの値を計算するかについて説明したが、Dが他の範囲内にある場合については、公式（13）に基づいて簡略化することもできる。なお。簡略化する方法は、公式（14）及び（15）に類似したので、ここでは、その詳しい説明を省略する。 Above, D is
(Outside 7)

Explained how to calculate the value of F only by simplifying formula (13) to formulas (14) and (15) only when it is in the range of D, but D is in another range Cases can be simplified based on formula (13). Note that. Since the simplification method is similar to the formulas (14) and (15), detailed description thereof is omitted here.

  By the above-described apparatus of the present embodiment, transmission signals of two different frequencies are alternately transmitted to the target product, and the distance from the transmission / reception unit to the target product (referred to as a detection distance) from the phase change amount of the reflected signal and the transmission signal. The first phase change amount due to can be removed, and the second phase change amount F due to the target product can be determined. As a result, an accurate F value can be obtained by extracting the amount of phase change due to reflection on the surface of a different target product and eliminating the influence on the calculation of the amount of phase change caused by a minute change in the detection distance.

  Example 2 provides an item detection apparatus. FIG. 3 is a diagram showing a configuration of the product detection apparatus. As shown in FIG. 3, the apparatus 300 includes the following.

Transmission / reception unit 301: Two transmission signals are alternately transmitted to the target product, and the two transmission signals are continuous waves of different frequencies, and the two reflected signals after the transmission signal is reflected by the target product Receive;
Detection unit 302: detects the target product based on a phase change amount (F) by the target product, and F is a phase change amount obtained after processing the two reflected signals.

  According to the above-described embodiment, the product can be detected based on the phase change amount of the reflected signal and the transmission signal due to the reflection of the target product surface, thereby solving the problem that the product cannot be accurately detected because the dielectric constants are close to each other. In addition to improving the detection accuracy, such a non-contact detection method can improve convenience, shorten the detection time, and reduce the detection cost.

  In the present embodiment, the specific implementation method of the transmission / reception unit 301 is similar to that of the transmission / reception unit 101 in the first embodiment, and therefore detailed description thereof is omitted here.

  In this embodiment, after the transmission signal is reflected by the target product surface, the phase change amount F can be obtained, and different F values can be generated by products of different materials. 302 can distinguish items of different materials using the value of F.

  FIG. 4 is a diagram showing another item detection apparatus in the present embodiment. As shown in FIG. 4, the apparatus 400 includes a transmission / reception unit 401 and a detection unit 402, and the implementation method of these units is the same as the transmission / reception unit 301 and the detection unit 302 shown in FIG. Detailed description thereof is omitted.

In this embodiment, the apparatus 400 may further include the following:
Information extraction unit 403: frequency mixing processing is performed on each of the two reflected signals and the two transmission signals to obtain two corresponding baseband signals; based on the two baseband signals, the transmission / reception is performed The phase change amount of the transmitted signal and the received reflected signal due to the distance (D) from the unit 401 to the product is removed, and the phase change amount F of the transmitted signal and the received reflected signal due to the target product is determined.

  Since the specific implementation method of the information extraction unit 403 is similar to the first processing unit 102 and the second processing unit 103 in the first embodiment, detailed description thereof is omitted here.

  In one implementation, the detection unit 402 corresponds to the phase change amount F based on the correspondence relationship between the reference phase change amount and the item stored in advance and the phase change amount F obtained by the information extraction unit 403. Goods can be detected.

  In this embodiment, the apparatus 400 may further include a training unit (not shown; optional), which uses different transmission / reception units 401 in advance, under different conditions under the condition that the distance to the target item is the same. The information extraction unit 403 acquires training data on the phase change amount of different items, and trains the training data on the phase change amount of different items in advance using a conventional machine learning method. And obtain a reference phase change amount corresponding to each item participating in the test (for example, a range of values between the minimum phase change amount and the maximum phase change amount obtained by the test for each type of item) Is the reference phase change amount corresponding to the product), whereby the correspondence between the reference phase change amount and the product can be obtained. When actually detecting, we do not know what the target product awaiting detection is, but the target product is determined based on the phase change amount F obtained by the information extraction unit 403 and the corresponding relationship. can do.

In the present embodiment, as can be seen from the above-described first embodiment, when the distance D between the transmission / reception unit 401 and the target product is in the range of different sections and the magnitude relationship between φ ₁ and φ ₂ is different, k ₁ and Unlike the relationship between k _2, it varies the value of the resulting F. Therefore, the training unit further changes the distance between the transmission / reception unit 401 and the target item, and acquires the training data of the phase change amount of different items under different distances by the test, thereby obtaining the reference phase change amount and the item. Can be made more detailed. In other words, the reference phase change amount includes at least one set of phase change amount numerical ranges corresponding to the different range ranges of the step changes with respect to the distance. Corresponding to the different magnitude relations of φ ₁ and φ ₂ , the numerical range of the phase change amount of each set includes the first numerical range and the second numerical range, and the first of the different items at the same distance. The first numerical range does not overlap (does not overlap), and the second numerical range does not overlap.

  When the detection unit 402 detects that the phase change amount F is within the above-described numerical range, the detection unit 402 can determine that the target item is an item corresponding to the reference phase change amount.

であり、mは、調整係数であり、その値は、正整数である。各区間範囲は、１組の位相変化量の数値範囲に対応し、例えば、
（外９）

は、第１組の位相変化量の数値範囲に対応し、
（外１０）

は、第２組の位相変化量の数値範囲に対応し、…、
（外１１）

は、第m組の位相変化量の数値範囲に対応し、各組の位相変化量の数値範囲は、第１数値範囲及び第２数値範囲を含み、それぞれ、φ₁-φ₂>0及びφ₁-φ₂<0の場合に対応する。 For example, as can be seen from Example 1 above, the predetermined section range is:
(Outside 8)

And m is an adjustment coefficient, and its value is a positive integer. Each section range corresponds to a numerical range of a set of phase change amounts, for example,
(Outside 9)

Corresponds to the numerical range of the first set of phase variations,
(Outside 10)

Corresponds to the numerical range of the second set of phase change amounts,
(Outside 11)

Corresponds to the numerical range of the m-th set of phase change amounts, and the numerical range of the phase change amount of each set includes the first numerical range and the second numerical range, and φ ₁ −φ ₂ > 0 and φ _1- corresponds to the case of φ ₂ <0.

  FIG. 5 is a diagram illustrating one implementation manner of the detection unit 402. As shown in FIG. 5, the detection unit 402 includes a first confirmation unit 501 and a second confirmation unit 502.

  The first deterministic unit 501 is based on the distance D and the adjustment coefficient m determined according to the range of several stepwise intervals related to the distance. Determine the numerical range of a set of phase variation.

In this embodiment, when detecting an article, the distance D is measured, and the step length c / 2 (f ₂ -f ₁ ) is calculated (or the distance D and the step length are stored in advance before detection). Thus, m is determined, and the specific implementation method for determining m is the same as that of the first embodiment, and therefore detailed description thereof is omitted here. Then, based on m, the numerical range of the m-th set of phase change amounts can be determined from at least one set of numerical range of the phase change amounts.

When φ ₁ −φ ₂ > 0, the second determinating unit 502 detects that F is within the second numerical range of the set of phase change amounts, or if φ ₁ −φ ₂ <0 In this case, when the F is detected to be in the second numerical range of the set of phase change amounts, the target item is determined as an item corresponding to the reference phase change amount.

In this embodiment, the first numerical value range and the second numerical value range of different items are different, and the first numerical value range and the second numerical value range are determined in advance by processing on the training data, 2 The determination unit 502 compares the F value obtained by the information extraction unit 403 with the different first numerical value range and the second numerical value range, and determines which item the F value is in the numerical value range corresponding to. By determining, the item can be detected. Among them, the calculation method of φ ₁ and φ ₂ can refer to the first embodiment, and the detailed description thereof is omitted here.

Hereinafter, how to detect an item will be described with an example. For example, there are a total of goods 1 and goods 2 waiting for detection, and the correspondence relationship between the reference phase change amount stored in advance and the goods is shown in Table 1 below.

  Table 1 is merely for illustratively explaining the correspondence between the reference phase change amount and the product, and the present embodiment is not limited to this.

When actually detecting, the distance D is measured, and the step length c / 2 (f ₂ -f ₁ ) is calculated (or the distance D and the step length may be stored in advance before detection) For example, D = 15 cm and step length = 5 cm. The transmission / reception unit 401 alternately transmits two transmission signals to the target item, and receives two reflection signals after the transmission signal is reflected by the item; the information extraction unit 403 receives the surface of the target item. The phase change amount F = 56 due to reflection is calculated (for example, F is calculated using the method in Example 1), and the detection unit 402 determines that the value of m is 3 based on the target product and the step length. Is determined to be the third set according to Table 1, and the detection unit 402 determines the numerical range based on the magnitude relationship between φ ₁ and φ ₂ . For example, when φ ₁ −φ ₂ > 0, the first numerical range is determined, and when F = 56 is in the range (50, 60), the target item is determined to be the item 2; φ ₁ −φ _{When 2} <0, the second numerical range is determined. If F = 56 is in the range (50, 70), the target product is determined to be the product 1.

  According to the above-described embodiment, the product can be detected based on the phase change amount of the incident signal and the transmission signal due to the reflection of the surface of the target product, and thus the product cannot be accurately detected because the dielectric constants are close to each other. The problem can be solved and the detection accuracy can be improved. Further, with such a non-contact detection method, convenience can be improved, detection time can be shortened, and detection cost can be reduced.

  The third embodiment further provides an information extraction device. FIG. 6 is a diagram illustrating a hardware configuration of the information extraction device according to the embodiment of the present invention. As shown in FIG. 6, the device 600 may include one interface (not shown), a central processing unit (CPU) 620, a storage 610, and a transceiver 640. The storage 610 is connected to the central processing unit 620. Connected. Among them, the storage device 610 can store various types of data, and can further store an information extraction program. The storage unit 610 executes the program under the control of the central processing unit 620, and stores various types of data in advance. A set value, a predetermined condition, and the like can be stored.

  In one implementation, the functionality of the information extraction device can be integrated into the central processing unit 620. Among them, the central processing unit 620 may be configured to perform the following control, that is, two transmission signals are alternately transmitted to the target product, and the two transmission signals are continuous waves of different frequencies. Two transmission signals after the transmission signal is reflected by the target product; among them, the phase change amount of the transmission signal and the received reflection signal is the distance from the transmission / reception unit to the target product ( The first phase change amount according to D) and the second phase change amount (F) due to the target product, and the second phase change amount of the two transmitted signals and the received reflected signal is the same; Frequency reflection processing is performed on each of the two reflected signals and the two transmission signals to obtain two corresponding baseband signals; based on the two baseband signals, the first phase is calculated from the phase change amount. Volume of removed, to confirm the second phase change amount, thereby performing the target goods detected by using the second phase change amount.

と表され、そのうち、λ₁、λ₂は、２つの送信信号の波長であり、φ₁、φ₂は、それぞれ、２つのベースバンド信号の位相であり、k₁、k₂は、未定係数であり、k₁、k₂は、区分線形関係を有し、k₁とk₂との間の関係は、前記距離D、及びφ₁及びφ₂間の関係に関連する。 Among them, the second phase change amount is

Λ ₁ and λ ₂ are the wavelengths of the two transmission signals, φ ₁ and φ ₂ are the phases of the two baseband signals, respectively, and k ₁ and k ₂ are undetermined coefficients And k ₁ and k ₂ have a piecewise linear relationship, and the relationship between k ₁ and k ₂ is related to the distance D and the relationship between φ ₁ and φ ₂ .

Among them, the central processing unit 620 may be further configured as follows, that is, determine the relationship between k ₁ and k ₂ based on the distance D and the relationship between φ ₁ and φ _2. To do.
When φ ₁ -φ ₂ > 0, k ₁ = k ₂ + m-1 and when φ ₁ -φ ₂ <0, k ₁ = k ₂ + m, where m is a distance adjustment factor And can be determined on the basis of the distance D and a range of some stepwise change intervals related to the distance.

であり、且つφ₁-φ₂>0の時に、k₁=k₂=kであり、

であり、kは、整数である。また、

であり、且つφ₁-φ₂<0の時に、k₁=k₂+1であり、

又は

である。 Of which

And when φ ₁ −φ ₂ > 0, k ₁ = k ₂ = k,

And k is an integer. Also,

And when φ ₁ −φ ₂ <0, k ₁ = k ₂ +1,

Or

It is.

  Since a specific implementation method of the central processing unit 620 can refer to the first embodiment, detailed description thereof is omitted here.

  In another implementation, the above-described information extraction device is configured as a chip (not shown) connected to the central processing unit 620, and the function of the information extraction device is realized by the control of the central processing unit 620. good.

  Note that the apparatus 600 does not necessarily include all the components in FIG. Further, the apparatus 600 may further include parts not shown in FIG. 6, and the prior art can be referred to for this.

  By the above-described apparatus of the present embodiment, transmission signals of two different frequencies are alternately transmitted to the target product, and the distance from the transmission / reception unit to the target product (referred to as a detection distance) from the phase change amount of the reflected signal and the transmission signal. The first phase change amount due to can be removed, and the second phase change amount F due to the target product can be determined. As a result, an accurate F value can be obtained by extracting the amount of phase change due to reflection on the surface of a different target product and eliminating the influence on the calculation of the amount of phase change caused by a minute change in the detection distance.

  The fourth embodiment further provides an item detection apparatus. FIG. 7 is a diagram illustrating a hardware configuration of the item detection device according to the embodiment of the present invention. As shown in FIG. 7, the apparatus 700 may include an interface (not shown), a central processing unit (CPU) 720, a storage unit 710, and a transceiver 740. The storage unit 710 is connected to the central processing unit 720. Connected. Among them, the storage device 710 can store various kinds of data, and can also store an article detection program, and executes the program under the control of the central processing unit 720 to set various kinds of presets. Stored values and correspondences can be stored.

  In one implementation, the functionality of the item detection device can be integrated into the central processing unit 720. Among them, the central processing unit 720 may be configured to perform the following control, that is, two transmission signals are alternately transmitted to the target product, and the two transmission signals are continuous waves of different frequencies. And receiving two reflected signals after the transmission signal is reflected by the product; detecting the target product based on a phase change amount (F) by the target product; This is the amount of phase change obtained after processing two reflected signals.

  Among them, the central processing unit 720 may further be configured as follows, that is, perform frequency mixing processing on the two reflected signals and the two transmission signals, respectively, and two corresponding bases. Obtaining a band signal; based on the two baseband signals, removing a phase change amount of a transmitted signal and a received reflected signal according to a distance (D) from the transmission / reception unit to the product, and The phase change amount F is determined; the product corresponding to the phase change amount F is detected based on the reference phase change amount stored in advance and the correspondence between the products and the obtained phase change amount F. The reference phase change amount includes at least one set of phase change amount numerical ranges, and each set of phase change amount numerical ranges includes a first numerical range and a second numerical range.

  Among them, the central processing unit 720 may be further configured as follows, that is, when the phase change amount F is detected to be within the numerical range, the target product corresponds to the reference phase change amount. It is determined that the product is to be used.

Among them, the central processing unit 720 may be further configured as follows, i.e., based on the distance D and an adjustment factor m determined according to a range of a number of stepwise varying sections related to the distance, A numerical range of one set of phase change amounts among the numerical ranges of the at least one set of phase change amounts is determined; when φ ₁ -φ ₂ > 0, F is a first of the one set of phase change amounts When it is detected that it is in the numerical range, or when φ ₁ -φ ₂ <0, the target product is detected when the F is detected to be in the second numerical range of the set of phase changes. It is determined that the product corresponds to the reference phase change amount.

  Since the specific implementation method of the central processing unit 720 can refer to the second embodiment, detailed description thereof is omitted here.

  In another implementation system, the above-described item detection device is configured as a chip (not shown) connected to the central processing unit 720, and the function of the item detection device is realized by controlling the central processing unit 720. good.

  Note that the apparatus 700 does not necessarily include all the components in FIG. Further, the device 700 may further include those not shown in FIG. 7, and the prior art can be referred to for this.

  According to the above-described embodiment, the product can be detected based on the amount of phase change between the reflection signal and the transmission signal due to the reflection of the target product surface, and thus the product cannot be accurately detected because the dielectric constants are close to each other. The non-contact detection method can improve convenience, shorten detection time, and reduce detection cost.

  The fifth embodiment of the present invention provides an information extraction method, and the principle by which the method solves the problem is similar to that of the device of the first embodiment. Since they can be referred to, duplicate descriptions with the same contents are omitted.

  FIG. 8 is a flowchart of one implementation method of the information extraction method of the present embodiment. As shown in FIG. 8, the method includes the following steps.

Step 801: Two transmission signals are alternately transmitted to a target product, the two transmission signals are continuous waves of different frequencies, and the two reflected signals after the transmission signal is reflected by the target product Of which the phase change amount of the transmission signal and the received reflected signal is the first phase change amount according to the distance (D) from the signal transmitting device to the target item, and the second phase due to the target item. The amount of change (F) is included, and the second phase change amount of the two transmitted signals and the received reflected signal is the same;
Step 802: Frequency mixing processing is performed on the two reflected signals and the two transmission signals, respectively, to obtain two corresponding baseband signals;
Step 803: removing the first phase change amount from the phase change amount based on the two baseband signals to determine the second phase change amount, thereby using the second phase change amount as a target Perform product detection.

  In the present embodiment, the specific implementation method of steps 801 to 803 can refer to the information extraction apparatus 100 in the first embodiment, and thus detailed description thereof is omitted here.

と表され、そのうち、λ₁、λ₂は、２つの送信信号の波長であり、φ₁、φ₂は、それぞれ、２つのベースバンド信号の位相であり；k₁、k₂は、未定係数であり、k₁、k₂は、区分線形関係を有し、そのうち、k₁とk₂との間の関係は、前記距離D、及びφ₁とφ₂間の関係に関連する。 In this embodiment, the second phase change amount is

Where λ ₁ and λ ₂ are the wavelengths of the two transmission signals, φ ₁ and φ ₂ are the phases of the two baseband signals, respectively; k ₁ and k ₂ are undetermined coefficients And k ₁ and k ₂ have a piecewise linear relationship, of which the relationship between k ₁ and k ₂ is related to the distance D and the relationship between φ ₁ and φ ₂ .

In step 803, the method further determines the relationship between k ₁ and k ₂ based on the distance D and the relationship between φ ₁ and φ ₂ ; when φ ₁ −φ ₂ > 0, k ₁ = k ₂ + m-1 and when φ ₁ -φ ₂ <0, k ₁ = k ₂ + m, where m is a distance adjustment factor, and the distance D and the distance It is determined on the basis of a range of sections that change in steps.

であり、且つφ₁-φ₂>0の時に、k₁=k₂=_kであり、

であり、kは、整数である。また、

であり、且つφ₁-φ₂<0の時に、k₁=k₂+1であり、

又は

である。 In one implementation,

And when φ ₁ -φ ₂ > 0, k ₁ = k ₂ = _k ,

And k is an integer. Also,

And when φ ₁ −φ ₂ <0, k ₁ = k ₂ +1,

Or

It is.

  According to the above-described method of the present embodiment, two transmission signals are alternately transmitted to the target product, and the first phase according to the distance from the unit transmitting the signal to the target product is determined from the phase change amount of the two reflected signals. The amount of change can be removed, and the second phase change amount F due to the target product can be determined. As a result, the amount of phase change due to reflection on the surface of a different target product is extracted, and an accurate F value is obtained by eliminating the influence on the calculation of the phase change value due to a minute change in the distance between the target product and the transmission / reception unit. be able to.

  Example 6 of the present invention provides an article detection method, and the principle by which the method solves the problem is similar to that of the apparatus of Example 2, so that the specific implementation is the implementation of the apparatus of Example 2. A duplicate description that can be referred to and has the same content is omitted.

  FIG. 9 is a flowchart of one implementation method of the article detection method of the present embodiment. As shown in FIG. 9, the method includes the following steps.

Step 900: Alternately transmit two transmission signals to the target item, the two transmission signals are continuous waves of different frequencies, and receive two reflection signals after the transmission signal is reflected by the item And
Step 902: The target product is detected based on a phase change amount (F) by the target product, and F is a phase change amount obtained after processing the two reflected signals.

  In the present embodiment, since the specific implementation method of steps 900 to 902 can refer to the item detection apparatus 300 in the second embodiment, detailed description thereof is omitted here.

  In this embodiment, the method may further include the following steps.

  Step 901 (optional): frequency mixing processing is performed on each of the two reflected signals and the two transmission signals to obtain two corresponding baseband signals; based on the two baseband signals, The phase change amount of the transmitted signal and the received reflected signal due to the distance (D) from the device that transmits the signal to the product is removed, and the phase change amount F of the transmitted signal and the received reflected signal of the target product is determined. Since the specific implementation method can refer to the information extraction unit 303 in the second embodiment, detailed description thereof is omitted here.

  In step 902, a target product corresponding to the phase change amount F is detected based on the reference phase change amount stored in advance and the correspondence between the items and the phase change amount F obtained by the information extraction unit.

  Among them, the reference phase change amount includes at least one set of phase change amount numerical ranges, and each set of phase change amount numerical ranges includes a first numerical range and a second numerical range; Is determined to be within the numerical range, the target product is determined to be a product corresponding to the reference phase change amount.

In one implementation, in step 902, the numerical range of the numerical range of the at least one set of phase change amounts is based on the distance D and an adjustment factor m determined according to a range of several stepwise intervals related to the distance. Determining a numerical range of one set of phase change amounts; if φ ₁ -φ ₂ > 0, when F is detected to be in a first numerical range of the set of phase change amounts, or When φ ₁ -φ ₂ <0, when the F is detected to be in the second numerical range of the set of phase change amounts, the target item is determined to be an item corresponding to the reference phase change amount. To do.

  FIG. 10 is a flowchart of the item detection method of the present embodiment. As shown in FIG. 10, the method includes the following steps.

Step 1001: Two transmission signals are alternately transmitted to a target product, the two transmission signals are continuous waves of different frequencies, and two reflected signals after the transmission signal is reflected by the target product Receive;
Step 1002: Frequency mixing processing is performed on each of the two reflected signals and the two transmission signals to obtain two corresponding baseband signals; a signal is transmitted based on the two baseband signals Removing the phase change amount of the transmitted signal and the received reflected signal according to the distance (D) from the device to the product to determine the phase change amount F by the target product;
Step 1003: Based on the reference phase change amount stored in advance and the correspondence relationship between the items based on the adjustment coefficient m determined according to the distance D and the range of some stepwise change intervals regarding the distance, Determine a set of phase change numerical ranges within a set of phase change numerical ranges;
Among them, the distance D and the range of the section can be obtained in advance before detection, or can be obtained by measurement at the time of detection, but this embodiment is not limited to this.
Step 1004: Determine whether the phase difference φ ₁ -φ _{2 of the two} baseband signals is greater than 0; if φ ₁ -φ ₂ > 0, execute Step 1005, otherwise execute Step 1006 And
Step 1005: Based on the correspondence relationship, when the F is detected to be in a first numerical range of the set of phase change amounts, the target item is determined to be an item corresponding to the reference phase change amount. And
Step 1006: Based on the correspondence relationship, when the F is detected to be in the second numerical range of the set of phase change amounts, the target item is determined to be an item corresponding to the reference phase change amount. To do.

  In the present embodiment, since the specific implementation method of steps 1001 to 1006 can refer to the second embodiment, detailed description thereof is omitted here. Further, the present embodiment does not limit the execution order of step 1002 and step 1003.

  According to the above-described embodiment, the product can be detected based on the amount of phase change between the reflection signal and the transmission signal due to the reflection of the target product surface, and thus the product cannot be accurately detected because the dielectric constants are close to each other. The non-contact detection method can improve convenience, shorten detection time, and reduce detection cost.

  Example 7 of the present invention provides an item detection system, which includes the item detection device in Example 2 or 4, and further includes a target item, so that its specific implementation is Since the implementation of the apparatus in Examples 2 and 4 can be referred to, duplicate descriptions with the same contents are omitted.

  FIG. 11 is a diagram showing the product detection system. As shown in FIG. 11, the system includes an object detection device and a target item 1102, and the item detection device includes a processor 11011, a transmission antenna 11012, and a reception antenna 11013.

  Among them, the processor 11011 may be configured to perform the following control, that is, the transmission unit 11012 alternately transmits two transmission signals to the target product, and the two transmission signals have different frequencies. The receiving antenna 11013 receives two reflected signals after the transmission signal is reflected by the item 1102; the phase change amount F by the target item calculated based on the two reflected signals. The target product 1102 is detected using.

  Among them, the specific implementation method of the processor 11011 can refer to the CPU 720 in the fourth embodiment, and thus detailed description thereof is omitted here.

  According to the above-described embodiment, the product can be detected based on the amount of phase change between the reflection signal and the transmission signal due to the reflection of the target product surface, and thus the product cannot be accurately detected because the dielectric constants are close to each other. The non-contact detection method can improve convenience, shorten detection time, and reduce detection cost.

  The embodiment of the present invention further provides a computer-readable program, and when the program is executed in the information extraction apparatus, the program causes the computer to execute the information extraction method described in the fifth embodiment.

  The embodiment of the present invention further provides a storage medium storing a computer readable program, wherein the computer readable program causes a computer to execute the information extracting method described in the fifth embodiment in an information extracting device.

  The embodiment of the present invention further provides a computer-readable program, and when the program is executed in the product detection apparatus, the program causes the computer to execute the product detection method described in the sixth embodiment.

  The embodiment of the present invention further provides a storage medium storing a computer-readable program, wherein the computer-readable program causes a computer to execute the product detection method described in Embodiment 6 in the product detection apparatus.

  The apparatus and method according to the embodiments of the present invention may be realized by software, may be realized by hardware, or may be realized by a combination of hardware and software. The present invention also relates to such a computer-readable program, that is, when the program is executed by a logic component, the logic component can realize the above-described apparatus or component, or The above-described method or its steps can be realized in the logic component. The present invention further relates to a storage medium for storing the above-described program, for example, a hard disk, a magnetic disk, an optical disk, a DVD, a fresh memory, and the like.

と表され、λ₁、λ₂は、２つの送信信号の波長であり、φ₁、φ₂は、それぞれ、２つのベースバンド信号の位相であり、k₁、k₂は、未定係数であり、k₁、k₂は、区分線形関係を有する、装置。
（付記3）
付記2に記載の装置であって、
前記k₁とk₂との間の関係は、前記距離D、及びφ₁とφ₂との関係に関連する、装置。
（付記4）
付記3に記載の装置であって、
確定ユニットをさらに含み、
前記確定ユニットは、
前記距離D、及びφ₁とφ₂との関係に基づいて、前記k₁とk₂との間の関係を確定し、
φ₁-φ₂>0の時に、k₁=k₂+m-1であり、φ₁-φ₂<0の時に、k₁=k₂+mであり、
前記mは、距離の調整係数であり、前記距離D、及び距離に関する若干個の段階的に変化する区間の範囲に基づいて確定される、装置。
（付記5）
付記4に記載の装置であって、

であり、且つφ₁-φ₂>0の時に、k₁=k₂=kであり、

であり、kは、整数であり；また

であり、且つφ₁-φ₂<0の時に、k₁=k₂+1であり、

又は

である、装置。
（付記6）
品物検出装置であって、
周波数が異なる連続波である２つの送信信号を目標品物に交替で送信し、また、前記送信信号が前記目標品物により反射された後の２つの反射信号を受信するための送受信ユニット；及び
前記２つの反射信号に基づて計算された、前記目標品物による位相変化量（F）を用いて前記目標品物を検出するための検出ユニットであって、前記Fは、前記２つの反射信号に対して処理を行った後に得られた位相変化量である、検出ユニットを含む、装置。
（付記7）
付記6に記載の装置であって、
前記２つの反射信号と、前記２つの送信信号とに対してそれぞれ周波数混合処理を行い、対応する２つのベースバンド信号を取得し、前記２つのベースバンド信号に基づいて、前記送受信ユニットから前記目標品物までの距離（D）による、反射信号と送信信号の位相変化量を除去し、前記目標品物による位相変化量（F）を確定するための情報抽出ユニットをさらに含み、
前記検出ユニットは、予め記憶された参照位相変化量と品物との対応関係、及び前記情報抽出ユニットが得た前記位相変化量（F）に基づいて、前記位相変化量（F）に対応する品物を検出する、装置。
（付記8）
付記7に記載の装置であって、
前記参照位相変化量は、少なくとも１組の位相変化量の数値範囲を含み、各組の位相変化量の数値範囲は、第１数値範囲及び第２数値範囲を含み、
前記検出ユニットは、前記位相変化量（F）が前記数値範囲内にあると検出した時に、前記目標品物が前記参照位相変化量に対応する品物であると確定する、装置。
（付記9）
付記8に記載の装置であって、
前記検出ユニットは、
前記距離D及び距離に関する若干個の段階的に変化する区間の範囲に基づいて確定された調整係数（m）により、前記少なくとも１組の位相変化量の数値範囲のうちの１組の位相変化量の数値範囲を確定するための第１確定ユニット；及び
φ₁-φ₂>0の場合、前記Fが前記１組の位相変化量の第１数値範囲内にあると検出された時に、又は、φ₁-φ₂<0の場合、前記Fが前記１組の位相変化量の第２数値範囲内にあると検出された時に、前記目標品物が前記参照位相変化量に対応する品物であると確定すする第２確定ユニットであって、φ₁、φ₂は、それぞれ、前記２つのベースバンド信号の位相である、第２確定ユニットを含む、装置。
（付記10）
付記6に記載の装置であって、
前記位相変化量は、

と表され、λ₁、λ₂は、２つの送信信号の波長であり、φ₁、φ₂は、それぞれ、２つのベースバンド信号の位相であり、k₁、k₂は、未定係数であり、k₁、k₂は、区分線形関係を有する、装置。
（付記11）
情報抽出方法であって、
目標品物に２つの送信信号を交替で送信し、前記２つの送信信号は、異なる周波数の連続波であり、また、前記送信信号が前記目標品物により反射された後の２つの反射信号を受信し；そのうち、前記反射信号と前記送信信号の位相変化量は、前記送受信ユニットから前記目標品物までの距離（D）による第１位相変化量、及び前記目標品物による第２位相変化量（F）を含み、且つ２つの送信信号及び受信した反射信号の第２位相変化量は、同じであり；
前記２つの反射信号と、前記２つの送信信号とに対してそれぞれ周波数混合処理を行い、対応する２つのベースバンド信号を取得し；
前記２つのベースバンド信号に基づいて、前記位相変化量のうちから前記第１位相変化量を除去し、前記第２位相変化量を、前記第２位相変化量を用いて目標品物検出を行うように確定することを含む、方法。
（付記12）
付記11に記載の方法であって、
前記第２位相変化量は、

と表され、λ₁、λ₂は、２つの送信信号の波長であり、φ₁、φ₂は、それぞれ、２つのベースバンド信号の位相であり、k₁、、k₂は、未定係数であり、k₁、k₂は、区分線形関係を有する、方法。
（付記13）
付記12に記載の方法であって、
前記k₁及びk₂間の関係は、前記距離D、及びφ₁とφ₂との関係に関連する、方法。
（付記14）
付記13に記載の方法であって、
前記距離D、及びφ₁とφ₂の関係に基づいて、k₁とk₂との間の関係を確定することをさらに含み、
φ₁-φ₂>0の時に、k₁=k₂+m-1であり、φ₁-φ₂<0の時に、k₁=k₂+mであり、
前記mは、距離の調整係数であり、また、前記距離D及び距離に関する若干個の段階的に変化する区間の範囲に基づいて確定される、方法。
（付記15）
付記14に記載の方法であって、

であり、且つφ₁-φ₂>0の時に、k₁=k₂=kであり、

であり、kは、整数であり；また

であり、且つφ₁-φ₂<0の時に、k₁=k₂+1であり、

又は

である、方法。 Further, the following supplementary notes are also disclosed with respect to the plurality of embodiments described above.
(Appendix 1)
An information extraction device,
A transmission / reception unit for alternately transmitting two transmission signals having different frequencies to a target item, and receiving two reflected signals after the transmission signal is reflected by the target item; The phase change amount of the reflected signal and the transmission signal includes a first phase change amount due to a distance (D) from the transmission / reception unit to the target product, and a second phase change amount (F) due to the target product, and A transmission / reception unit in which the second transmission signal and the received reflected signal have the same second phase change amount;
A first processing unit for performing frequency mixing on each of the two reflected signals and the two transmission signals to obtain two corresponding baseband signals; and based on the two baseband signals, A second processing unit for removing the first phase change amount from the phase change amount and determining the second phase change amount to perform target product detection using the second phase change amount; apparatus.
(Appendix 2)
The apparatus according to appendix 1, wherein
The second phase change amount is

Λ ₁ and λ ₂ are the wavelengths of the two transmission signals, φ ₁ and φ ₂ are the phases of the two baseband signals, respectively, and k ₁ and k ₂ are undetermined coefficients , K ₁ , k ₂ have piecewise linear relationships.
(Appendix 3)
The apparatus according to appendix 2, wherein
The apparatus wherein the relationship between k ₁ and k ₂ is related to the distance D and the relationship between φ ₁ and φ ₂ .
(Appendix 4)
The apparatus according to appendix 3,
Further including a confirmation unit,
The confirmation unit is
Based on the distance D and the relationship between φ ₁ and φ ₂ , determine the relationship between the k ₁ and k ₂ ,
When the φ ₁ -φ _2> 0, a _{k 1 = k 2 + m-} 1, when φ ₁ -φ ₂ <0, a k ₁ = k ₂ + m,
The m is a distance adjustment coefficient, and is determined based on the distance D and a range of a number of step-related sections related to the distance.
(Appendix 5)
The apparatus according to appendix 4, wherein

And when φ ₁ −φ ₂ > 0, k ₁ = k ₂ = k,

And k is an integer; and

And when φ ₁ −φ ₂ <0, k ₁ = k ₂ +1,

Or

Is the device.
(Appendix 6)
An item detection device comprising:
A transmission / reception unit for alternately transmitting two transmission signals, which are continuous waves of different frequencies, to a target item, and receiving two reflected signals after the transmission signal is reflected by the target item; and A detection unit for detecting the target product using a phase change amount (F) by the target product calculated based on the two reflected signals, wherein F is for the two reflected signals An apparatus including a detection unit, which is a phase change amount obtained after processing.
(Appendix 7)
The apparatus according to appendix 6, wherein
Frequency mixing processing is performed on each of the two reflected signals and the two transmission signals, two corresponding baseband signals are obtained, and the target is transmitted from the transmission / reception unit based on the two baseband signals. An information extraction unit for removing a phase change amount of a reflected signal and a transmission signal according to a distance (D) to the product and determining a phase change amount (F) by the target product;
The detection unit is a product corresponding to the phase change amount (F) based on the correspondence between the reference phase change amount stored in advance and the product, and the phase change amount (F) obtained by the information extraction unit. Detect the device.
(Appendix 8)
The apparatus according to appendix 7,
The reference phase change amount includes at least one set of phase change amount numerical ranges, and each set of phase change amount numerical ranges includes a first numerical range and a second numerical range,
The detection unit determines that the target item is an item corresponding to the reference phase change amount when detecting that the phase change amount (F) is within the numerical range.
(Appendix 9)
The apparatus according to appendix 8, wherein
The detection unit is
A set of phase variations in the numerical range of the at least one set of phase variations by means of an adjustment factor (m) determined based on the distance D and a range of several stepwise intervals related to the distance. A first determining unit for determining a numerical range of; and if φ ₁ −φ ₂ > 0, when said F is detected to be within a first numerical range of said set of phase variations, or When φ ₁ −φ ₂ <0, when the F is detected to be within the second numerical range of the set of phase change amounts, the target item is an item corresponding to the reference phase change amount An apparatus comprising: a second determinating unit for determining, wherein φ ₁ and φ ₂ are each a phase of the two baseband signals.
(Appendix 10)
The apparatus according to appendix 6, wherein
The phase change amount is

Λ ₁ and λ ₂ are the wavelengths of the two transmission signals, φ ₁ and φ ₂ are the phases of the two baseband signals, respectively, and k ₁ and k ₂ are undetermined coefficients , K ₁ , k ₂ have piecewise linear relationships.
(Appendix 11)
An information extraction method,
Two transmission signals are alternately transmitted to the target product, the two transmission signals are continuous waves of different frequencies, and the two reflected signals after the transmission signal is reflected by the target product are received. Among them, the phase change amount of the reflected signal and the transmission signal is a first phase change amount due to a distance (D) from the transmission / reception unit to the target item, and a second phase change amount (F) due to the target item. And the second phase variation of the two transmitted signals and the received reflected signal is the same;
Frequency mixing processing is performed on each of the two reflected signals and the two transmission signals to obtain two corresponding baseband signals;
Based on the two baseband signals, the first phase change amount is removed from the phase change amounts, and the target product detection is performed using the second phase change amount by using the second phase change amount. A method comprising: confirming.
(Appendix 12)
The method according to appendix 11, wherein
The second phase change amount is

Λ ₁ and λ ₂ are the wavelengths of the two transmission signals, φ ₁ and φ ₂ are the phases of the two baseband signals, respectively, and k _{1 and} k ₂ are undetermined coefficients. A method, wherein k ₁ and k ₂ have a piecewise linear relationship.
(Appendix 13)
The method according to appendix 12, wherein
The method wherein the relationship between k ₁ and k ₂ is related to the distance D and the relationship between φ ₁ and φ ₂ .
(Appendix 14)
The method according to appendix 13, wherein
Determining a relationship between k ₁ and k ₂ based on the distance D and the relationship between φ ₁ and φ ₂ ;
When the φ ₁ -φ _2> 0, a _{k 1 = k 2 + m-} 1, when φ ₁ -φ ₂ <0, a k ₁ = k ₂ + m,
The m is a distance adjustment factor, and is determined based on the distance D and a range of a number of stepwise intervals related to the distance.
(Appendix 15)
The method according to appendix 14, wherein

And when φ ₁ −φ ₂ > 0, k ₁ = k ₂ = k,

And k is an integer; and

And when φ ₁ −φ ₂ <0, k ₁ = k ₂ +1,

Or

Is that way.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to this embodiment, and all modifications to the present invention belong to the technical scope of the present invention unless departing from the spirit of the present invention.

Claims (10)

An information extraction device,
A transmission / reception unit for alternately transmitting two transmission signals having different frequencies to a target item, and receiving two reflected signals after the transmission signal is reflected by the target item; The phase change amount of the reflected signal and the transmission signal includes a first phase change amount due to a distance (D) from the transmission / reception unit to the target product, and a second phase change amount (F) due to the target product, and A transmission / reception unit in which the two transmission signals and the two reflected signals have the same second phase change amount;
A first processing unit for performing frequency mixing on each of the two reflected signals and the two transmission signals to obtain two corresponding baseband signals; and based on the two baseband signals, A second processing unit for removing the first phase change amount from the phase change amount and determining the second phase change amount to detect the target product using the second phase change amount; Including the device. The apparatus of claim 1, wherein
The second phase change amount is

Λ ₁ and λ ₂ are the wavelengths of the two transmission signals, φ ₁ and φ ₂ are the phases of the two baseband signals, and k ₁ and k ₂ are undetermined coefficients. , Also having a piecewise linear relationship. The apparatus according to claim 2, wherein
The apparatus wherein the relationship between k ₁ and k ₂ is related to the distance D and the relationship between φ ₁ and φ ₂ . The apparatus according to claim 3, wherein
Further including a confirmation unit,
The confirmation unit is
Based on the relationship between the distance D, and phi ₁ and phi _2, to confirm the relationship between the k ₁ and k _2,
When the φ ₁ -φ _2> 0, a _{k 1 = k 2 + m-} 1, when φ ₁ -φ ₂ <0, a k ₁ = k ₂ + m,
The m is a distance adjustment coefficient, and is determined based on the distance D and a range of a plurality of step-related sections related to the distance. The apparatus according to claim 4, wherein

And when φ ₁ −φ ₂ > 0, k ₁ = k ₂ = k,

And k is an integer; and

And when φ ₁ −φ ₂ <0, k ₁ = k ₂ +1,

Or

Is the device. An item detection device comprising:
A transmission / reception unit for alternately transmitting two transmission signals that are continuous waves of different frequencies to a target item, and receiving two reflected signals after the transmission signal is reflected by the target item; and the target A detection unit for detecting the target product based on a phase change amount (F) by the product, wherein F is a phase change amount obtained after processing the two reflected signals. Including a detection unit. The apparatus according to claim 6, wherein
Frequency mixing processing is performed on each of the two reflected signals and the two transmission signals, two corresponding baseband signals are obtained, and the target is transmitted from the transmission / reception unit based on the two baseband signals. An information extraction unit for removing a phase change amount of a reflected signal and a transmission signal according to a distance (D) to the product and determining a phase change amount (F) by the target product;
The detection unit is a product corresponding to the phase change amount (F) based on the correspondence between the reference phase change amount stored in advance and the product, and the phase change amount (F) obtained by the information extraction unit. Detect the device. The apparatus according to claim 7, wherein
The reference phase change amount includes a numerical range of at least one set of phase change amounts, and the numerical range of the phase change amount of each set includes a first numerical range and a second numerical range,
The detection unit determines that the target item is an item corresponding to the reference phase change amount when detecting that the phase change amount (F) is within the numerical range. The apparatus according to claim 8, wherein
The detection unit is
A set of phase change amounts in the numerical range of the at least one set of phase change amounts by an adjustment coefficient (m) determined based on the distance D and a range of a plurality of step-changing sections related to the distance. A first determining unit for determining a numerical range of; and if φ ₁ −φ ₂ > 0, when said F is detected to be within a first numerical range of said set of phase variations, or When φ ₁ −φ ₂ <0, when the F is detected to be within the second numerical range of the set of phase change amounts, the target item is an item corresponding to the reference phase change amount An apparatus comprising a second deterministic unit for determinizing, wherein φ ₁ and φ ₂ are phases of the two baseband signals. The apparatus according to claim 6, wherein
The phase change amount is

Λ ₁ and λ ₂ are the wavelengths of the two transmission signals, φ ₁ and φ ₂ are the phases of the two baseband signals, and k ₁ and k ₂ are undetermined coefficients. , Also having a piecewise linear relationship.

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