CN113009475A - Radar reflector, radar detection system, radar signal detection method and device - Google Patents
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- CN113009475A CN113009475A CN202110196342.5A CN202110196342A CN113009475A CN 113009475 A CN113009475 A CN 113009475A CN 202110196342 A CN202110196342 A CN 202110196342A CN 113009475 A CN113009475 A CN 113009475A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/0205—Simultaneously evaluating both cardiovascular conditions and different types of body conditions, e.g. heart and respiratory condition
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
- A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
- A61B5/6813—Specially adapted to be attached to a specific body part
- A61B5/6823—Trunk, e.g., chest, back, abdomen, hip
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/35—Details of non-pulse systems
- G01S7/352—Receivers
- G01S7/354—Extracting wanted echo-signals
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/41—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00 using analysis of echo signal for target characterisation; Target signature; Target cross-section
- G01S7/418—Theoretical aspects
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Abstract
The invention relates to the technical field of signal enhancement, in particular to a radar reflector, a radar detection system, a radar signal detection method and a radar signal detection device, wherein the radar reflector is of a disc-shaped structure and is made of aluminum or aluminum alloy materials; the radar detection system comprises a radar reflector and a frequency modulation continuous wave radar which is arranged towards the direction of the radar reflector; the method comprises the following steps: the method comprises the steps of determining the maximum RCS value of a radar reflector according to the radius of the radar reflector and the wavelength of radar waves, determining the deviation interval of the RCS value according to the maximum RCS value, detecting the current RCS value of the radar reflector in real time, controlling the frequency modulation continuous wave radar to transmit the radar waves to the radar reflector according to the detection angle by taking the current angle of the frequency modulation continuous wave radar as the detection angle when the current RCS value is in the deviation interval, and receiving echo signals returned from the radar reflector.
Description
Technical Field
The invention relates to the technical field of signal enhancement, in particular to a radar reflector, a radar detection system, a radar signal detection method and a radar signal detection device.
Background
In the traditional physiological signal acquisition, various sensor electrodes are required to be arranged on a human body, such as electrocardio, blood oxygen, blood pressure, body temperature and the like. Various sensors need to be worn or tied, are complex to use and have poor comfort level, and often need professional personnel to measure, so that the sensors are difficult to popularize in daily life scenes.
In recent years, the biological radar non-contact type sign detection technology has attracted more and more attention due to the advantages of non-contact, small volume, accurate measurement and the like.
The non-contact radar vital sign monitoring technology is a new detection technology, electromagnetic waves emitted by a radar irradiate a human body, the radar waves are modulated by the motion of the chest and the abdomen to generate a Doppler effect, and therefore, vital information can be extracted from echo signals received by the radar. The vital sign monitoring technology is free from restriction on human bodies, is not easily influenced by the surrounding environment, and has the advantage of non-contact and non-inductive measurement.
The difficulty in the development of non-contact radar vital sign monitoring technology lies in effectively extracting vital sign signals, because respiratory signals and heartbeat signals of a human body may be weaker relative to noise and clutter. Therefore, effectively enhancing the respiration signal and the heartbeat signal becomes one of the key difficulties of the physical sign monitoring radar.
Disclosure of Invention
The present invention is directed to a radar reflector, a radar detection system, a radar signal detection method and apparatus, which are used to solve one or more of the problems of the prior art and provide at least one of the advantages of the present invention.
In order to achieve the purpose, the invention provides the following technical scheme:
a radar reflector is of a disc-shaped structure and is made of aluminum or an aluminum alloy material.
Further, the diameter of the radar reflector is 8cm to 12cm, and the thickness is 1 mm.
Further, the back of the radar reflector is provided with a viscous material.
A radar detection system, comprising:
the radar reflector of any of the above;
a frequency modulated continuous wave radar disposed toward the radar reflector.
A radar signal detection method is based on the radar detection system, and comprises the following steps:
s100, determining a maximum RCS value of the radar reflector according to the radius of the radar reflector and the radar wavelength, and determining a deviation interval of the RCS value according to the maximum RCS value;
s200, controlling a frequency modulation continuous wave radar to transmit radar waves to a radar reflector, and detecting the current RCS value of the radar reflector in real time, wherein the radar reflector is arranged on the chest wall of a human body to be detected, and the frequency modulation continuous wave radar is arranged towards the direction of the radar reflector;
step S300, adjusting the angle of the frequency modulation continuous wave radar, determining whether the current RCS value is in a deviation interval in real time, and taking the current angle of the frequency modulation continuous wave radar as a detection angle when the current RCS value is in the deviation interval;
and S400, controlling the frequency modulation continuous wave radar to transmit radar waves to the radar reflector according to the detection angle and receiving echo signals returned from the radar reflector.
Further, the maximum RCS value is expressed by the formula
Is calculated, whereinmaxRepresents the maximum RCS value of the radar reflector, r is the radius of the radar reflector, and λ is the wavelength of the radar wave.
A radar signal detection device based on the radar detection system, the device comprising:
the determining module is used for determining the maximum RCS value of the radar reflector according to the radius of the radar reflector and the radar wavelength, and determining the deviation interval of the RCS value according to the maximum RCS value;
the detection module is used for controlling the frequency modulation continuous wave radar to transmit radar waves to the radar reflector and detecting the current RCS value of the radar reflector in real time;
the radar reflector is arranged on the chest wall of a human body to be detected, and the frequency modulation continuous wave radar is arranged towards the direction of the radar reflector;
the adjusting module is used for adjusting the angle of the frequency modulation continuous wave radar, determining whether the current RCS value is in a deviation interval in real time, and taking the current angle of the frequency modulation continuous wave radar as a detection angle when the current RCS value is in the deviation interval;
and the detection module is used for controlling the frequency modulation continuous wave radar to transmit radar waves to the radar reflector according to the detection angle and receiving echo signals returned from the radar reflector.
The invention has the beneficial effects that: the invention discloses a radar reflector, a radar detection system, a radar signal detection method and a device.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic diagram of the results of a radar reflector in an embodiment of the invention;
FIG. 2 is a schematic flow chart of a radar signal detection method according to an embodiment of the present invention;
FIG. 3 is a comparative illustration of RCS values in an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a radar signal detection device in an embodiment of the present invention.
Detailed Description
The conception, the specific structure and the technical effects of the present invention will be clearly and completely described in conjunction with the embodiments and the accompanying drawings to fully understand the objects, the schemes and the effects of the present invention. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
Referring to fig. 1, fig. 1 shows a radar reflector according to an embodiment of the present invention, which is a disc-shaped structure and is made of aluminum or an aluminum alloy material.
The radar reflector provided by the invention is used for detecting human body signs, and is designed into a disc made of aluminum or aluminum alloy material aiming at the actual requirement of monitoring the vital signs through a radar. The radar reflector is completely different from common radar corner reflectors and the like in shape, and is also different in constituent materials. The traditional corner reflector is composed of three triangular aluminum or aluminum alloy plates, and is not suitable for monitoring vital signs; the invention is a round aluminum or aluminum alloy plate. When carrying out vital sign monitoring, paste the chest position at chest or clothing with the Radar reflector, can increase the RCS value (Radar Cross section n) of chest wall to can strengthen the echo signal intensity that vital signs such as breathing heartbeat arouse greatly, make the echo signal effect that the Radar was received better, the quality is higher, and then promote vital sign monitoring Radar to breathe and the accuracy of physiological parameter measurement such as heartbeat.
The reason for using aluminum material is that aluminum has many excellent properties, and aluminum alloy are widely used, economical and practical materials, and have the advantages of low cost, high cost performance and the like. The light weight and corrosion resistance characteristics of aluminum also enable better preservation and maintenance of the radar reflector.
In a modified embodiment, the radar reflector has a diameter of 8cm to 12cm and a thickness of 1 mm.
In a modified embodiment, the back of the radar reflector is provided with an adhesive material.
Preferably, the diameter of the radar reflector is 10cm, the adhesive material is double-sided adhesive tape, and the protective surface is directly torn off and attached to the chest when the radar reflector is used.
When the vital sign monitoring is carried out, the radar reflector is adhered to the chest of a human body through the adhesive material, and the novel placement mode is realized.
Referring to fig. 2, as shown in fig. 2, a radar signal detection method according to an embodiment of the present invention is a radar detection system according to any of the above embodiments, the method includes the following steps:
s100, determining a maximum RCS value of the radar reflector according to the radius of the radar reflector and the radar wavelength, and determining a deviation interval of the RCS value according to the maximum RCS value;
s200, controlling a frequency modulation continuous wave radar to transmit radar waves to a radar reflector, and detecting the current RCS value of the radar reflector in real time;
the radar reflector is arranged on the chest wall of a human body to be detected, and the frequency modulation continuous wave radar is arranged towards the direction of the radar reflector;
step S300, adjusting the angle of the frequency modulation continuous wave radar, determining whether the current RCS value is in a deviation interval in real time, and taking the current angle of the frequency modulation continuous wave radar as a detection angle when the current RCS value is in the deviation interval;
and S400, controlling the frequency modulation continuous wave radar to transmit radar waves to the radar reflector according to the detection angle and receiving echo signals returned from the radar reflector.
The radar echo enhancement method provided by the invention is used for detecting human body signs, and the human body signs are extracted from echo signals. It should be noted that the basic principle of radar detection is to emit electromagnetic waves to irradiate a target, and then to detect signals and measure parameters of the target by using the electromagnetic waves reflected from the target to the radar receiving antenna. The more the electromagnetic wave energy reflected by the target back to the receiving antenna is, the larger the equivalent radar sectional area is, the more obvious the signal characteristics of the target to the radar are, and the stronger the detection capability of the radar to the target is. The Radar Cross Section (RCS) of a target is related to the shape, size, structure and material of the target.
The invention makes the radar reflector into a disc shape to enhance the strength of the echo signal. After the radar waves irradiate the radar reflector, the echo signals of the target can be enhanced due to the radar reflector which is made of metal and in the shape of a disc, and the target has a very high signal-to-noise ratio in the radar signals, so that the detection and parameter estimation of the target are facilitated.
In the embodiment provided by the invention, the characteristic that the reflection coefficient of a metal material is stronger than that of skin or clothes is utilized in combination with the actual requirement and daily wearing convenience of a vital sign monitoring radar, and the disc type low-cost radar reflector is designed.
In one embodiment, the maximum RCS value is formulated by
Is calculated, whereinmaxRepresents the maximum RCS value of the radar reflector, r is the radius of the radar reflector, and λ is the wavelength of the radar wave.
Referring to fig. 3, the effect of the radar reflector usage is analyzed by a specific embodiment as follows:
when using radar for vital sign monitoring, there are two cases in most cases: one is dressing and the other is bare upper body. Echo signals received by the radar under the condition of using the radar reflector and the condition of not using the radar reflector are respectively tested through simulation experiments to verify the specific application effect of the invention.
The disk model was created in three-dimensional full-wave electromagnetic simulation software (FEKO software). In the case of using a 77GHz vital signs monitoring radar, RCS values were calculated for the chest wall when only clothing was worn, only bare upper body was worn, and a radar reflector was used, respectively.
As can be seen from fig. 3, the RCS value of the radar reflector is significantly greater than the RCS value of the fabric material and the dry skin of the human body, which indicates that the radar reflector of the present invention can better reflect the characteristic information of the chest wall.
The signal-to-noise ratio of the echo signal may be calculated using the following equation:
in the formula, PtExpressing the transmitting power of the frequency modulation continuous wave radar, G expressing the antenna gain of the frequency modulation continuous wave radar, lambda is the working wavelength of the frequency modulation continuous wave radar, sigma is the RCS value of the chest wall, k is the boltzmann constant, T0Representing standard room temperature, B being the receiver bandwidth of the frequency modulated continuous wave radar, F being the receiver noise coefficient of the frequency modulated continuous wave radar, L being the loss of the frequency modulated continuous wave radar, R representing the distance between the chest wall and the frequency modulated continuous wave radar.
Generally, the larger the signal-to-noise ratio, the smaller the noise mixed in the signal, and the higher the quality of the signal. The signal-to-noise ratio of the radar reflector is calculated to be increased by 3.01dB when the signal-to-noise ratio of the radar reflector is exposed on the upper body under the same condition. The signal-to-noise ratio using a radar reflector increased by 11.14dB over the clothing. According to simulation results, the echo signal can be obviously enhanced. Therefore, the quality of the vital sign signals measured by the radar can be effectively improved by using the method and the device.
Referring to fig. 4, the present invention further provides a radar signal detection apparatus, based on the radar detection system according to any of the above embodiments, the apparatus includes:
a determining module 100, configured to determine a maximum RCS value of the radar reflector according to the radius of the radar reflector and the radar wavelength, and determine a deviation interval of the RCS value according to the maximum RCS value;
the detection module 200 is used for controlling the frequency modulation continuous wave radar to transmit radar waves to the radar reflector and detecting the current RCS value of the radar reflector in real time;
the radar reflector is arranged on the chest wall of a human body to be detected, and the frequency modulation continuous wave radar is arranged towards the direction of the radar reflector;
the adjusting module 300 is configured to adjust an angle of a frequency modulated continuous wave radar, determine whether the current RCS value is within a deviation interval in real time, and use the current angle of the frequency modulated continuous wave radar as a detection angle when the current RCS value is within the deviation interval;
and the detection module 400 is configured to control the fm continuous wave radar to transmit radar waves to the radar reflector according to the detection angle, and receive echo signals returned from the radar reflector.
While the present invention has been described in considerable detail and with particular reference to a few illustrative embodiments thereof, it is not intended to be limited to any such details or embodiments or any particular embodiments, but rather it is to be construed that the invention effectively covers the intended scope of the invention by virtue of the prior art providing a broad interpretation of such claims in view of the appended claims. Furthermore, the foregoing describes the invention in terms of embodiments foreseen by the inventor for which an enabling description was available, notwithstanding that insubstantial modifications of the invention, not presently foreseen, may nonetheless represent equivalent modifications thereto.
Claims (7)
1. A radar reflector is characterized in that the radar reflector is of a disc-shaped structure and is made of aluminum or aluminum alloy materials.
2. A radar reflector according to claim 1, characterized in that the radar reflector has a diameter of 8cm to 12cm and a thickness of 1 mm.
3. A radar reflector according to claim 2, characterized in that the rear side of the radar reflector is provided with an adhesive material.
4. A radar detection system, comprising:
the radar reflector of any one of claims 1 to 3;
a frequency modulated continuous wave radar disposed toward the radar reflector.
5. A radar signal detection method based on the radar detection system of claim 4, the method comprising the steps of:
s100, determining a maximum RCS value of the radar reflector according to the radius of the radar reflector and the radar wavelength, and determining a deviation interval of the RCS value according to the maximum RCS value;
s200, controlling a frequency modulation continuous wave radar to transmit radar waves to a radar reflector, and detecting the current RCS value of the radar reflector in real time, wherein the radar reflector is arranged on the chest wall of a human body to be detected, and the frequency modulation continuous wave radar is arranged towards the direction of the radar reflector;
step S300, adjusting the angle of the frequency modulation continuous wave radar, determining whether the current RCS value is in a deviation interval in real time, and taking the current angle of the frequency modulation continuous wave radar as a detection angle when the current RCS value is in the deviation interval;
and S400, controlling the frequency modulation continuous wave radar to transmit radar waves to the radar reflector according to the detection angle and receiving echo signals returned from the radar reflector.
6. The radar signal detection method of claim 5, wherein the maximum RCS value is formulated by
ComputingIs obtained, wherein σmaxRepresents the maximum RCS value of the radar reflector, r is the radius of the radar reflector, and λ is the wavelength of the radar wave.
7. A radar signal detection apparatus, based on the radar detection system of claim 4, characterized in that the apparatus comprises:
the determining module is used for determining the maximum RCS value of the radar reflector according to the radius of the radar reflector and the radar wavelength, and determining the deviation interval of the RCS value according to the maximum RCS value;
the detection module is used for controlling the frequency modulation continuous wave radar to transmit radar waves to the radar reflector and detecting the current RCS value of the radar reflector in real time;
the radar reflector is arranged on the chest wall of a human body to be detected, and the frequency modulation continuous wave radar is arranged towards the direction of the radar reflector;
the adjusting module is used for adjusting the angle of the frequency modulation continuous wave radar, determining whether the current RCS value is in a deviation interval in real time, and taking the current angle of the frequency modulation continuous wave radar as a detection angle when the current RCS value is in the deviation interval;
and the detection module is used for controlling the frequency modulation continuous wave radar to transmit radar waves to the radar reflector according to the detection angle and receiving echo signals returned from the radar reflector.
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| 张庸: "《遥感成像原理及图像特征》", 31 October 1994, 地质出版社 * |
| 杨立新: "《航标》", 31 October 2016, 大连海事大学出版社 * |
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