JP2018025521A - Doppler radar detector, program, and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mechanical method that can determine the stages of silkworms breeding (mounting of silkworms, for example) without relying on the hunch or experiences of experts (sericulturists).SOLUTION: A Doppler radar detector R includes; a spectrum calculation section for calculating the spectrum of Doppler transitions between radar sending/receiving signals; and a rate distribution evaluation section for evaluating the degree of spreading to a higher rate direction of a rate distribution of the position of a radar sending/receiving antenna on the silkworms group on a silkworm seat S made of silkworms W based on the degree of spreading of the spectrum of the Doppler transitions between radar sending/receiving signals to the higher frequency direction.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to a technique for mechanically and quantitatively evaluating the activity of movement of a group of people, animals, vehicles, and the like. Specifically, the present disclosure relates to a technique for mechanically determining each stage (for example, upper eyelid time) of breeding a group of moths on Scorpio.

  In sericulture, the upper cocoon (giving a place to make cocoons) is an important parameter that affects the quality of the cocoon. Traditionally, the upper heel period is based on the knowledge and experience of the expert (sericulture operator) based on the fact that the chest of the heel is clear, the body shape of the heel is short and thick, and the heel is crawling around. (For example, refer nonpatent literature 1.).

Agricultural Research Institute, “Sericulture”, Chapters 6 and 7, [online], [Search on July 14, 2016], Internet <URL: http: // www. silk. or. jp / silk_gijiyu / youusan. html>

  By the way, in research institutes that do not keep pupae daily, it is required to reduce the probability of rearing failure by appropriately determining the upper pupae time. And even in the case of a sericulture worker who keeps pupae daily, it is required to improve and stabilize the quality of the cocoon by appropriately determining the upper cocoon time. However, in the past, it is difficult to appropriately determine the timing of upper eyelids, which requires the intuition and experience of a skilled person (sericulture operator).

  Therefore, in order to solve the above-described problem, the present disclosure aims to mechanically and quantitatively evaluate the activity of movement of a group of humans, animals, vehicles, and the like in which a large number move around in random directions. And Specifically, the present disclosure provides a mechanical method that does not depend on the intuition and experience of an expert (a sericulture company) in appropriately determining each stage of the pupa breeding (for example, the upper culm period). With the goal.

  In order to achieve the above object, the activity of humans, animals, vehicles, and the like is mechanically determined by detecting the moving speed of the humans, animals, vehicles, etc. with a radar. Here, with respect to individual humans, animals, vehicles, and the like, many people move around in random directions, and it is difficult to detect individual values of the moving speed with a radar. However, for a group of humans, animals, vehicles, etc., it is possible to detect the overall distribution of the moving speed with a radar by making use of the fact that many move around in random directions.

  Specifically, the present disclosure is based on a spectrum calculation unit that calculates a spectrum of Doppler shift between radar transmission / reception signals, and a spread degree of the spectrum of Doppler shift between radar transmission / reception signals in a high frequency direction, A Doppler radar detection apparatus comprising: a velocity distribution evaluation unit that evaluates a degree of spread in a high velocity direction of a velocity distribution with respect to a position of a radar transmission / reception antenna with respect to a target group composed of a plurality of targets.

  According to this configuration, it is possible to mechanically and quantitatively evaluate the activity of movement of a group of humans, animals, vehicles, and the like in which many move around in random directions.

  In order to achieve the above purpose, paying attention to the fact that each stage of cocoon breeding and the speed at which the cocoon crawls have a corresponding relationship, each stage of breeding cocoon is detected by detecting the speed at which the cocoon crawls with a radar. Was determined mechanically. Here, with respect to individual ridges on the scorpio, it is difficult for many to crawl in random directions, and it is difficult to detect individual values of the crawl speed with a radar. However, it is possible to detect the entire distribution of the speed of the crawls on the scorpio by using the fact that many crawl in random directions.

  Specifically, in the present disclosure, the velocity distribution evaluation unit is on a scorpion composed of a plurality of ridges based on a spread degree of a spectrum of a Doppler shift between the radar transmission and reception signals in a high frequency direction. A Doppler radar detection apparatus that evaluates a degree of spread in a high-speed direction of a velocity distribution with respect to a position of the radar transmitting / receiving antenna with respect to a saddle group.

  According to this configuration, it is possible to provide a mechanical method that does not depend on the intuition and experience of a skilled person (sericulture contractor) in appropriately determining each stage of breeding of pupae.

  Further, according to the present disclosure, the velocity distribution evaluation unit determines an upper eyelid timing of the eyelid group on the scorpio based on a degree of spread of a spectrum of a Doppler shift between the radar transmission and reception signals in a high frequency direction. This is a Doppler radar detection device.

  According to this configuration, it is possible to provide a mechanical method that does not depend on the intuition and experience of a skilled person (sericulture operator) in appropriately determining the upper eyelid time when the rice cakes crawl around.

  Further, according to the present disclosure, the velocity distribution evaluation unit is configured to perform the calculation based on a ratio between a spectrum intensity at a predetermined high frequency and a spectrum intensity at a predetermined low frequency regarding a spectrum of Doppler shift between the radar transmission and reception signals. A Doppler radar detection apparatus characterized by determining an upper eyelid time of a group of eyelids on a seat.

  According to this configuration, it is not necessary to perform a simple but uncertain process of examining the high-frequency end of the Doppler spectrum, and until a reliable but complicated process of examining the entire shape of the Doppler spectrum. Therefore, it is possible to appropriately determine the upper eyelid time with reasonable certainty and simplicity. Note that the ratio between the spectral intensity at a predetermined high frequency and the spectral intensity at a predetermined low frequency is considered not to depend on the number of powers on the Cancer.

  Further, according to the present disclosure, the velocity distribution evaluation unit is based on a time derivative of a ratio between a spectrum intensity at a predetermined high frequency and a spectrum intensity at a predetermined low frequency with respect to a spectrum of Doppler shift between the radar transmission and reception signals. A Doppler radar detection apparatus for determining an upper eyelid time of the eyelid group on the Cancer.

  According to this configuration, it is not necessary to perform a simple but uncertain process of examining the high-frequency end of the Doppler spectrum, and until a reliable but complicated process of examining the entire shape of the Doppler spectrum. Therefore, it is possible to appropriately determine the upper eyelid time with reasonable certainty and simplicity. In addition, it is considered that the time derivative of the ratio between the spectral intensity at a predetermined high frequency and the spectral intensity at a predetermined low frequency does not depend on the power on the Cancer.

  In addition, the present disclosure provides a subtraction signal from the radar reception signal when removing a signal having a frequency component in which a Doppler shift between the radar transmission and reception signals is zero from the radar reception signal before amplification of the radar reception signal. The Doppler radar detection device further comprises a Doppler no-shift component removal unit that adjusts the amplitude and phase of a signal having a frequency component in which the Doppler shift between the radar transmission and reception signals is zero.

  According to this configuration, it is possible to extract the reflection signal from the scooping heel by removing the reflection signal from the scorpio that does not move. As long as the saturation level of the receiver is not reached, it is possible to amplify the reflected signal from the crawling hail.

  Further, the present disclosure provides a plurality of objects based on a spectrum calculating step for calculating a spectrum of a Doppler shift between radar transmission / reception signals and a degree of spread of the spectrum of the Doppler shift between radar transmission / reception signals in a high frequency direction. A Doppler radar detection program for causing a computer to sequentially execute a velocity distribution evaluation step for evaluating a degree of spread in a high velocity direction of a velocity distribution with respect to a position of a radar transmitting / receiving antenna regarding a target group composed of targets.

  Further, the present disclosure provides a plurality of objects based on a spectrum calculating step for calculating a spectrum of a Doppler shift between radar transmission / reception signals and a degree of spread of the spectrum of the Doppler shift between radar transmission / reception signals in a high frequency direction. A Doppler radar detection method comprising, in order, a velocity distribution evaluation step for evaluating a degree of spread in a high velocity direction of a velocity distribution with respect to a position of a radar transmission / reception antenna relating to a target group composed of targets.

  According to this configuration, it is possible to mechanically and quantitatively evaluate the activity of movement of a group of humans, animals, vehicles, and the like in which many move around in random directions.

  As described above, according to the present disclosure, it is possible to mechanically and quantitatively evaluate the activity of movement of a group of people, animals, vehicles, and the like in which a large number move around in random directions. Specifically, according to the present disclosure, a mechanical method that does not depend on the intuition and experience of a skilled person (a sericulture company) is provided for appropriately determining each stage of pupa breeding (for example, the upper culm period). can do.

It is a figure which shows the structure of the Doppler radar detection apparatus of the sericulture use of this indication. It is a figure which shows the determination principle of the upper eyelid time of the eyelid group on the Cancer of this indication. It is a figure which shows the determination principle of the upper eyelid time of the eyelid group on the Cancer of this indication. It is a figure which shows the determination method of the upper eyelid time of the eyelid group on the Cancer of this indication. It is a figure which shows the determination method of the upper eyelid time of the eyelid group on the Cancer of this indication. It is a figure which shows the determination method of the upper eyelid time of the eyelid group on the Cancer of this indication. It is a figure which shows the feedthrough cancellation principle of the reflected signal from the scorpio of this indication. It is a figure which shows the feedthrough cancellation principle of the reflected signal from the scorpio of this indication. It is a figure which shows the Doppler spectrum before and behind the feedthrough cancellation of this indication. It is a figure which shows the structure of the Doppler radar detection apparatus of the general use of this indication.

  Embodiments of the present disclosure will be described with reference to the accompanying drawings. The embodiments described below are examples of the present disclosure, and the present disclosure is not limited to the following embodiments.

(Configuration of Doppler radar detector for sericulture)
The configuration of the Doppler radar detection device for sericulture of the present disclosure is shown in FIG. The Doppler radar detection device R for sericulture uses a VCO (Voltage-Controlled Oscillator) 1, a directional coupler 2, a directional coupler 3, a transmitting antenna 4, a receiving antenna 5, a directional coupler 6, an amplifier 7, a mixer 8, It comprises an attenuator 9, a line stretcher 10, a filter 11, an A / D converter 12, an FFT (Fast Fourier Transformation) calculator 13, an integrator 14, a memory 15, and a comparison / determination unit 16.

  The VCO 1 generates a radar transmission signal and generates a mixer signal having the same frequency as the radar transmission signal for detecting a Doppler shift between the radar transmission and reception signals. The directional coupler 2 outputs a radar transmission signal to the directional coupler 3 and outputs a mixer signal to the mixer 8. Here, in this embodiment, a continuous wave radar system is applied. However, as a modification, a pulse radar method may be applied. Which radar system to apply may be determined according to the distance from the Doppler radar detection device R to the scorpio S.

  The directional coupler 3 outputs a radar transmission signal to the transmission antenna 4 and also outputs a cancellation signal having the same frequency as the radar transmission signal for generating a feedthrough cancellation signal described later, to the attenuator 9 and the line stretcher. 10 is output. The transmission antenna 4 irradiates a radar group with a radar transmission signal on a saddle group on a Cancer S composed of a plurality of saddles W.

  The receiving antenna 5 receives a radar reflection signal from a saddle group on the Cancer S composed of a plurality of saddles W. The directional coupler 6 inputs a radar reflected signal from the receiving antenna 5, inputs a feedthrough cancel signal described later from an attenuator 9 and a line stretcher 10, and generates a combined signal of the radar reflected signal and a feedthrough cancel signal described later. Output to the amplifier 7.

  Here, in the present embodiment, the speed at which 蚕 W crawls in the plane of Scorpore S is detected by making the radar irradiation / reflection direction substantially parallel to the surface of Scorpio S in which 蚕 W crawls. However, as a modification, the radar irradiation / reflection direction may be substantially perpendicular to the surface of the Scorpio S where the Scorpio W crawls, and the speed at which the Saddle W lifts the head from the plane of the Scorpore S may be detected. In FIG. 1, the transmitting antenna 4 and the receiving antenna 5 are arranged bistatically. However, as shown in FIG. 2, the transmission antenna 4 and the reception antenna 5 may be monostatically arranged.

  The amplifier 7 amplifies a combined signal of the radar reflection signal and a feedthrough cancel signal described later. The mixer 8 multiplies the amplified signal of the synthesized signal and the mixer signal, and generates the amplified signal of the synthesized signal and the sum frequency signal of the mixer signal, and the difference frequency signal of the synthesized signal amplified signal and the mixer signal. To do. The filter 11 removes the sum frequency signal of the synthesized signal and the mixer signal, and extracts a difference frequency signal between the synthesized signal and the mixer signal. The A / D converter 12 performs A / D conversion on the difference frequency signal between the amplified signal and the mixer signal.

  Here, the amplified signal of the combined signal does not include a signal having the same frequency as the radar transmission signal, but includes only a signal having a frequency different from that of the radar transmission signal. On the other hand, the mixer signal has the same frequency as the radar transmission signal. Therefore, the difference frequency signal between the amplified signal of the synthesized signal and the mixer signal includes information on the Doppler shift between the radar transmission / reception signals.

  The FFT calculator 13 performs an FFT calculation on the difference signal between the amplified signal and the mixer signal. The integrator 14 performs a smoothing process on the FFT calculation result. The FFT calculator 13 and the integrator 14 correspond to a spectrum calculator 18 described later, and can calculate a spectrum of Doppler shift between radar transmission / reception signals.

  The memory 15 stores a spectrum of Doppler shifts between radar transmission / reception signals as a database for a group on the scorpio S composed of a plurality of cocoons W determined by a skilled worker (a sericulture worker) as the upper cocoon time. ing. The comparison / determination unit 16 compares the spectrum of the Doppler shift between the radar transmission / reception signals calculated by the FFT calculator 13 and the integrator 14 with the spectrum of the Doppler shift between the radar transmission / reception signals stored in the memory 15. Then, the presence or absence of the upper eyelid time is determined for the saddle group on the saddle S composed of the plurality of eyelids W to be detected by the Doppler radar detection device R. The memory 15 and the comparison / determination unit 16 correspond to a velocity distribution evaluation unit 19 to be described later, and are configured with a plurality of 蚕 Ws based on the extent of the spectrum of the Doppler shift between the radar transmission and reception signals in the high frequency direction. The upper eyelid time of the eyelid group on Scorpio S can be determined.

(Principle of judgment of the upper eyelid time of the moth group on Scorpio)
The principle of determining the upper eyelid time of the eyelid group on the scorpio according to the present disclosure is shown in FIGS. 2 and 3. In the saddle group on the saddle S composed of a plurality of saddles W, the speeds v at which the individual saddles W roll are substantially the same, but the directions in which the individual rounds W roll are random. For radar transmission signal, the wavelength is lambda, the frequency is f _c, the propagation velocity and _c (= f c λ).

As shown in FIG. 2A, when the radar irradiation direction and the movement direction of each kite W are perpendicular, the Doppler shift between the radar transmission and reception signals does not occur in the reflected signal from the kite W. . As shown in FIG. 2B, when the radar irradiation direction and the direction of movement of each kite W are parallel, the reflected signal from the kite W has a maximum v-vector between the transmitted and received radar signals. Doppler shift (Doppler frequency f _d = 2v / λ = 2vf _c / c) occurs. As shown in (c) of FIG. 2, (v vector when in an intermediate state of FIG. 2 (a) and (b) is a parallel v _a vector radar irradiation direction, and the radar irradiation direction perpendicular _{v b} vector is decomposed into.), in the reflected signal from the silkworm W, _v by the amount of _a vector, the Doppler shift between the radar transmitting and receiving signals (Doppler frequency _{f d = 2v a / λ =} 2v _a f _c / c) occurs.

Here, in this embodiment, a microwave is applied as the radar transmission signal. However, as a modification, millimeter waves, ultrasonic waves, or the like may be applied as radar transmission signals. Whether to apply any waveform may be determined in accordance with the detection range of the Doppler frequency f _d.

As shown in (1) of FIG. 3, as a contribution to the Doppler spectrum from the radar reflected signals from the individual ridges W in the state shown in (b) of FIG. 2, at a predetermined high Doppler frequency f _d2 When the spectral intensity S (f _d2 ) is detected as a finite value, the group of ridges on the scorpio S composed of a plurality of ridges W crawls and is well-ripened and the upper ridge time is reached.

As shown in (2) of FIG. 3, as a contribution to the Doppler spectrum from the radar reflected signals from the individual ridges W in the state shown in (b) of FIG. 2, at a predetermined high Doppler frequency f _d2 When the spectrum intensity S (f _d2 ) is not detected as a finite value, the group of ridges on the scorpio S composed of a plurality of ridges W is not so crawling, is not matured properly, and the upper wing time has not come.

  Here, if only the high-frequency end of the Doppler spectrum is examined, the determination process of the upper eyelid time is simple but may be uncertain (because there is uncertainty about the number of individuals of 蚕 W, It becomes difficult to set a threshold value for determining the presence or absence of a high frequency end.) On the other hand, if the entire shape of the Doppler spectrum is examined, the determination process of the upper eyelid time is certain but may be complicated (because there is uncertainty in the number of individuals of W), the Doppler spectrum (It will be difficult to verify the

Accordingly, the ratio _S (f d2) between the spectral intensity S _{(f d1)} in the spectral intensity S _{(f d2)} and a predetermined low Doppler frequency _{f d1} in a predetermined high Doppler frequency _{f d2} / S _{(f d1)} inspecting the Can be considered. In the Doppler spectrum at the time of appropriate ripening as shown in (1) of FIG. 3, S (f _d2 ) / S (f _d1 )> 0. In the Doppler spectrum before suitable ripening as shown in (2) of FIG. 3, S (f _d2 ) / S (f _d1 ) = 0.

Here, since the spectral intensity S is considered to be proportional to the number of powers on Scorpio S, it is considered that S (f _d2 ) / S (f _d1 ) does not depend on the number of powers on Scorpio S. That is, in the Doppler spectrum at an appropriate maturity as shown in (1) of FIG. 3, S (f _d2 , many) / S (f _d1 , many) = S (f _d2 , few) / S (f _d1 , Small)> 0. In the Doppler spectrum before suitable ripening as shown in (2) of FIG. 3, S (f _d2 , many) / S (f _d1 , many) = S (f _d2 , few) / S (f _d1 , Small) = 0. Thus, since only S (f _d2 ) / S (f _d1 ) is examined, the determination process of the upper eyelid timing is reasonably simple and reliable.

Here, in the present embodiment, the ratio of the spectral intensity S at two predetermined frequencies is examined, and the determination process of the upper eyelid time is simplified. However, as a modified example, the ratio of the spectral intensity S in the predetermined three or more frequencies (e.g., the ratio _{S (f} d3 spectral intensity S at frequency _f d1 _<f d2 _{<f d3} given 3 points) / S ( f _d1 ), S (f _d3 ) / S (f _d2 ), S (f _d2 ) / S (f _d1 )) may be examined to ensure the upper eyelid timing determination process.

(Judgment method of the upper lid time of the wings on Scorpio)
A method for determining the upper eyelid time of the eyelid group on the scorpio according to the present disclosure is shown in FIGS. In FIG. 4, the Doppler spectrum in each stage I-VI of the rearing of a pupa is shown. FIG. 5 shows k = S (f _d2 ) / S (f _d1 ) in each stage I to VI of the cage breeding. FIG. 6 shows k ′ = dk / dt (dt represents time differentiation) in each stage I to VI of the cage breeding.

As shown in I of FIG. 4, as a contribution to the Doppler spectrum from reflected signals from the non-moving Scorpio S and the non-moving Saddle W at the time of four sleeps, only S (f _d ˜0) is a finite value. Detected, S (f _d1 ) and S (f _d2 ) are not detected as finite values. As shown in II and III of FIG. 4, as a contribution to the Doppler spectrum from the reflected signal from the roaring wrinkles W, from the time of 4 sleep to 5 years old, and at the age of 5 gradually increasing, S (f _d2 ) is gradually detected to be large. As shown in IV of FIG. 4, S (f _d2 ) is detected most greatly as a contribution to the Doppler spectrum from the reflected signal from the wrinkle that crawls at a suitable maturity when it is most active. As shown in FIG. 4 V and VI, the contribution to the Doppler spectrum from the reflected signal from the roaring wrinkles in the overripe that gradually inactivates and in the overripe that further inactivates. S (f _d2 ) is detected to be gradually smaller.

In FIG. 5, the comparison / determination unit 16 uses the memory 15 to relate the spectrum of the Doppler shift between the radar transmission / reception signals to the spectrum intensity S (f _d2 ) at the predetermined high frequency f _d2 and at the predetermined low frequency f _d1 . Based on the ratio k = S (f _d2 ) / S (f _d1 ) with the spectral intensity S (f _d1 ), the upper eyelid timing of the eyelid group on the cancer S composed of a plurality of eyelids W is determined.

k = S (f _d2 ) / S (f _d1 ) gradually increases from stage I to stage IV, and gradually decreases from stage IV to stage VI. Therefore, the memory 15 stores a value of k = S (f _d2 ) / S (f _d1 ) at the appropriate maturity time determined by the skilled person (sericulture worker) as the upper cocoon time. The comparison determination unit 16, the value of the calculated _{k = S (f d2) /} S (f d1) is, reaches the value of the stored _{k = S (f d2) /} S (f d1) Or when the stored value of k = S (f _d2 ) / S (f _d1 ) is exceeded, it is determined that the upper eyelid time has come. On the other hand, the comparison determination unit 16, the value of the calculated _{k = S (f d2) /} S (f d1) is reached the value of the stored _{k = S (f d2) /} S (f d1) If not, or if the stored value of k = S (f _d2 ) / S (f _d1 ) is not exceeded, it is determined that the upper eyelid time has not come.

In FIG. 6, the comparison / determination unit 16 uses the memory 15 to relate the spectrum of the Doppler shift between the radar transmission / reception signals to the spectrum intensity S (f _d2 ) at the predetermined high frequency f _d2 and at the predetermined low frequency f _d1 . Based on the time derivative k ′ = dk / dt of the ratio to the spectral intensity S (f _d1 ), the upper eyelid timing of the eyelid group on the armpit S composed of a plurality of eyelids W is determined.

  k ′ = dk / dt takes a positive value from stage I to stage IV and takes a negative value from stage IV to stage VI. Therefore, the memory 15 stores k ′ = dk / dt value˜0 at the time of appropriate maturity determined by the skilled person (sericulture worker) as the upper cocoon time. Then, when the calculated value of k ′ = dk / dt has reached the value of k ′ = dk / dt stored from a positive value to 0, the comparison / decision unit 16 has reached the upper eyelid time. It is determined that On the other hand, when the calculated value of k ′ = dk / dt does not reach the value of k ′ = dk / dt stored from a positive value to 0, the comparison / decision unit 16 determines that the upper eyelid time is Judge that it has not arrived.

Here, in this embodiment, the method for determining the upper eyelid time shown in FIGS. 5 and 6 is applied independently. However, as a modification, the upper eyelid time determination method shown in FIGS. 5 and 6 may be applied together. That is, when both of the following (Condition 1) and (Condition 2) are satisfied, it is determined that the upper eyelid time has come: (Condition 1) Calculated k = S (f _d2 ) / S The value of (f _d1 ) has reached the stored value of k = S (f _d2 ) / S (f _d1 ), or the stored value of k = S (f _d2 ) / S (f _d1 ) The value of is exceeded. (Condition 2) The calculated value of k ′ = dk / dt has reached the value of k ′ = dk / dt to 0 stored from the positive value.

(Feed-through cancellation principle of reflected signal from Scorpio)
The principle of the feedthrough cancellation of the reflected signal from the scorpio of the present disclosure is shown in FIGS. FIG. 7 shows a case where the feedthrough cancellation of the reflected signal from Scorpio S is not executed. In FIG. 8, the case where the feedthrough cancellation of the reflected signal from Scorpio S is performed is shown.

  Here, in the present embodiment, the feedthrough cancellation of the reflected signal from the scorpio S is performed before the mixer 8 and not after the mixer 8. However, in FIG. 7 and FIG. 8, the signal level at the subsequent stage of the mixer 8 will be described from the viewpoint of ease of explanation.

  As shown in FIG. 7, the reflected signal from the scorpio S that does not move is a DC signal that does not include a Doppler shift between the radar transmission and reception signals and has a large amplitude. On the other hand, the reflected signal from the scooping wrinkle W is an alternating current signal including a Doppler shift between radar transmission and reception signals and having a small amplitude. However, the reflected signal actually observed is a composite signal of the reflected signal from the scorpio S that does not move and the reflected signal from the wing W that crawls around. Here, the overall level of the reflected signal actually observed is considered to be considerably higher than the saturation level of the receiver. Therefore, the reflected signal input to the FFT calculator 13 is a DC signal whose amplitude is clipped to the saturation level of the receiver, and does not include a Doppler shift between the radar transmission and reception signals. In other words, the movement of the scissors W is not visible at all.

  As shown in FIG. 8, the feedthrough cancel signal is a signal having the same amplitude and an opposite phase compared to the reflected signal from the scorpio S that does not move. Therefore, after the feedthrough cancellation, the reflected signal from the scorpio S that does not move is removed, but only the reflected signal from the scissors W that crawls is extracted. Here, the overall level of the reflected signal from the crawling W is considered to be significantly lower than the saturation level of the receiver. Thus, even after amplification, the overall level of the reflected signal from the crawling wrinkles W is considered to be still lower than the saturation level of the receiver. The reflected signal input to the FFT calculator 13 includes a Doppler shift between radar transmission / reception signals. In other words, the movement of the heel W that crawls around can be surely seen.

  Specifically, the attenuator 9 and the line stretcher 10 remove the reflected signal from the scorpio S that does not move from the radar reception signal before the amplification of the radar reception signal by the amplifier 7. Here, the attenuator 9 adjusts the amplitude of the cancellation signal having the same frequency as the radar transmission signal with respect to the subtraction signal from the radar reception signal by manually or automatically adjusting the attenuation degree. The line stretcher 10 adjusts the phase of the cancellation signal having the same frequency as the radar transmission signal with respect to the subtraction signal from the radar reception signal by manually or automatically adjusting the line length. The attenuator 9 and the line stretcher 10 correspond to a Doppler no-shift component removing unit 17 described later.

FIG. 9 shows Doppler spectra before and after the feedthrough cancellation of the present disclosure. In the Doppler spectrum before the feedthrough cancellation, a frequency component having a Doppler shift of ~ 0 between the radar transmission and reception signals remains. In the Doppler spectrum after the feedthrough cancellation, the frequency component whose Doppler shift between the radar transmission and reception signals is ˜0 is removed. Here, in order that k = S (f _d2 ) / S (f _d1 ) and k ′ = dk / dt are hardly affected by the feedthrough cancellation, it is desirable that f _d1 , f _d2 >> 0. .

(Configuration of Doppler radar detector for general use)
FIG. 10 shows a configuration of a general-purpose Doppler radar detection device of the present disclosure. A general-purpose Doppler radar detection device R includes a VCO 1, a directional coupler 2, a transmission antenna 4, a reception antenna 5, a Doppler no-shift component removal unit 17, an amplifier 7, a mixer 8, a spectrum calculation unit 18, and a velocity distribution evaluation unit 19. Consists of The VCO 1, the directional coupler 2, the transmission antenna 4, the reception antenna 5, the amplifier 7 and the mixer 8 are the same as those in FIGS.

  The Doppler no-shift component removing unit 17 removes a signal having a frequency component having a Doppler shift of 0 between radar transmission and reception signals from the radar reception signal before the radar reception signal is amplified by the amplifier 7. For the subtracted signal from the signal, the amplitude and phase of the signal having a frequency component in which the Doppler shift between the radar transmission and reception signals is zero are adjusted. The spectrum calculation unit 18 calculates the spectrum of the Doppler shift between the radar transmission / reception signals.

  The velocity distribution evaluation unit 19 determines the position of the radar transmission / reception antenna with respect to the saddle group on the saddle S composed of a plurality of saddles W based on the extent of the spectrum of the Doppler shift between the radar transmission / reception signals in the high frequency direction. The degree of spread of the velocity distribution in the high velocity direction is evaluated. Thus, for the environmental control such as the temperature of Scorpio S, the humidity of Scorpio S, the light intensity of Scorpio S, the preparation of Scorpio S, the mulberry extraction to the cocoon W and the mulberry supply to the cocoon W, etc. In appropriately determining each stage of breeding, it is possible to provide a mechanical method that does not depend on the intuition and experience of an expert (sericulture worker).

  The velocity distribution evaluation unit 19 determines the velocity relative to the position of the radar transmission / reception antenna with respect to the target group G composed of a plurality of targets T based on the extent of the spectrum of the Doppler shift between the radar transmission / reception signals in the high frequency direction. Evaluate the extent of the distribution in the high speed direction. Thereby, it is possible to mechanically and quantitatively evaluate the activity of movement of a group of humans, animals, vehicles, and the like other than the kite W, in which many people move around in random directions.

  The Doppler radar detection apparatus R shown in FIGS. 1 and 10 can be realized by installing a Doppler radar detection program for causing a computer to sequentially execute the above-described spectrum calculation step and velocity distribution evaluation step.

  The Doppler radar detection apparatus, program, and method of the present disclosure are active not only for swarms of sharks on the scorpio but also for swarms of humans, animals, vehicles, etc., as long as many move in random directions. The thickness can be evaluated mechanically and quantitatively.

R: Doppler radar detector 1: VCO
2: Directional coupler 3: Directional coupler 4: Transmission antenna 5: Reception antenna 6: Directional coupler 7: Amplifier 8: Mixer 9: Attenuator 10: Line stretcher 11: Filter 12: A / D converter 13 : FFT calculator 14: Integrator 15: Memory 16: Comparison / determination unit 17: Doppler no-shift component removal unit 18: Spectrum calculation unit 19: Velocity distribution evaluation unit S: Cancer W: 蚕 G: Target group T: Target

Claims (8)

A spectrum calculation unit for calculating a spectrum of a Doppler shift between radar transmission and reception signals;
Based on the extent of the spectrum of the Doppler shift between the radar transmission / reception signals in the high frequency direction, the spread of the velocity distribution with respect to the position of the radar transmission / reception antenna with respect to the target group composed of a plurality of targets in the high speed direction A velocity distribution evaluation unit for evaluating the degree,
A Doppler radar detection apparatus comprising: The velocity distribution evaluation unit is configured to determine a position of the radar transmitting / receiving antenna with respect to a saddle group on a saddle composed of a plurality of saddles based on a degree of spread of a spectrum of Doppler shift between the radar transmitting / receiving signals in a high frequency direction. The Doppler radar detection device according to claim 1, wherein a degree of spread in a high speed direction of a velocity distribution with respect to is evaluated. The velocity distribution evaluation unit determines the upper eyelid timing of the eyelid group on the scorpio based on the extent of the spectrum of the Doppler shift between the radar transmission / reception signals in the high frequency direction, The Doppler radar detection device according to claim 2. The velocity distribution evaluation unit is configured to determine a spectrum of the saddle group on the scorpio based on a ratio between a spectrum intensity at a predetermined high frequency and a spectrum intensity at a predetermined low frequency regarding a spectrum of Doppler shift between the radar transmission and reception signals. The Doppler radar detection apparatus according to claim 3, wherein the upper lid timing is determined. The velocity distribution evaluation unit is based on a time derivative of a ratio between a spectrum intensity at a predetermined high frequency and a spectrum intensity at a predetermined low frequency with respect to a spectrum of Doppler shift between the radar transmission and reception signals. 5. The Doppler radar detection device according to claim 3, wherein the upper lid timing is determined.   Before removing a signal having a frequency component in which the Doppler shift between the radar transmission / reception signals is 0 from the radar reception signal before amplification of the radar reception signal, the radar transmission / reception signal is subtracted from the radar reception signal. The Doppler radar according to any one of claims 1 to 5, further comprising a Doppler no-shift component removing unit that adjusts an amplitude and a phase of a signal having a frequency component in which a Doppler shift between them is zero. Detection device. A spectrum calculating step for calculating a spectrum of a Doppler shift between radar transmission and reception signals;
Based on the extent of the spectrum of the Doppler shift between the radar transmission / reception signals in the high frequency direction, the spread of the velocity distribution with respect to the position of the radar transmission / reception antenna with respect to the target group composed of a plurality of targets in the high speed direction A velocity distribution evaluation step for evaluating the degree;
A Doppler radar detection program for causing a computer to execute in order. A spectrum calculating step for calculating a spectrum of a Doppler shift between radar transmission and reception signals;
Based on the extent of the spectrum of the Doppler shift between the radar transmission / reception signals in the high frequency direction, the spread of the velocity distribution with respect to the position of the radar transmission / reception antenna with respect to the target group composed of a plurality of targets in the high speed direction A velocity distribution evaluation step for evaluating the degree;
In order, a Doppler radar detection method.

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