KR20230111121A - Continuous wave radar based distance measuring device and method - Google Patents

Abstract

Disclosed are a continuous wave (CW) radar-based distance measuring device and method, which may effectively remove a distance error generated by multi-pass and clutter. The CW radar-based distance measuring device according to one embodiment of the present invention comprises: a signal generation unit for generating a CW signal; a signal comparison unit for comparing a transmission signal and a reception signal of the CW signal as the CW signal is generated from the signal generation unit; a power conversion unit for detecting a CW overlapping signal at a time when transmission and reception sections are overlapped as the CW signal is transmitted to an object, reflected, and then received based on a pre-set maximum detection distance operation time; a comparison unit for comparing the CW overlapping signal with a noise filtering reference to output the same; and a control unit for controlling CW signal output to the signal generation unit according to a pre-set CW output time, counting the number of distance determination repetitions corresponding to the CW signal output, and detecting the distance by using the number of the distance determination repetitions corresponding to the CW overlapping signal.

Description

CW radar based distance measuring device and method {CONTINUOUS WAVE RADAR BASED DISTANCE MEASURING DEVICE AND METHOD}

The disclosed embodiments relate to CW radar based ranging technology.

Radar sensor technology is a technology that can estimate various object information such as distance, speed, and location. CW radar (Continuous Wave Radar) technology using a dual continuous wave signal compares a transmitted signal and a received signal, and is a technology used to measure movement or speed with Doppler frequency components. Motion and speed information can be obtained with a simple hardware configuration, which is advantageous for implementing a low-cost motion sensor, but there are many limitations in detecting an object distance, and characteristic degradation may occur due to multipath or clutter.

Methods for measuring distance in a typical radar sensor include a pulse radar method that measures time-of-flight (TOF) that occurs at this time by transmitting and receiving pulses, and a frequency modulation (FM) CW radar method that measures the degree of frequency change that occurs between transmitting and receiving signals through frequency modulation. In the pulse radar method, TOF is measured using an internal counter, etc., and a counter and an integrator must be provided, and a high-performance pulse generator implementation may be required because a pulse with a narrow pulse interval must be generated.

For FMCW radar, it is very important to generate a signal source capable of constantly changing the frequency, and the limits of detectable object characteristics are determined according to the characteristics of the signal source. As such, distance measurement in an existing radar sensor may require hardware that is complex and difficult to implement and a complex signal processing technique for extracting distance information from an acquired original signal.

Republic of Korea Patent Registration No. 10-0597343 (2006.06.29.)

Disclosed embodiments are intended to provide a CW radar-based distance measurement device and method capable of distance measurement based on a CW radar (Continuous Wave Radar).

A CW radar-based distance measurement apparatus according to an embodiment includes a signal generator for generating a continuous wave (CW) signal; a signal comparison unit for comparing a transmission signal and a reception signal of the CW signal as the CW signal is generated from the signal generation unit; Pre-set maximum detection distance operation time ( ), as the CW signal is transmitted to the object, reflected, and then received, the overlapping time at which the transmission and reception sections overlap each other ( ) power conversion unit for detecting the CW superposition signal at the time of occurrence; a comparator for comparing the CW superposition signal detected through the power converter with a noise filtering criterion and outputting the result to a control unit; and a controller for controlling the output of the CW signal to the signal generation unit according to a preset CW output time, counting the number of iterations of distance determination corresponding to the output of the CW signal, and detecting the distance to the object using the CW overlap signal and the number of repetitions of distance determination corresponding to the CW overlap signal.

The controller may check whether the CW superposition signal is detected through the power converter while increasing or decreasing the number of repetitions of the distance determination whenever the CW signal is output.

The power conversion unit may convert the detected CW superposition signal from a frequency signal form to a DC form and output the converted signal.

The control unit, the maximum detection distance operating time ( ) to the minimum detection distance operating time ( ), the number of repetitions of distance determination (N) and the reference time for distance precision ( ) can be calculated based on

The control unit, the maximum detection distance operating time ( ) is calculated according to Equation 1, and Equation 1 is, and the above is the minimum detection distance operation time, is the number of iterations of distance determination at the time when the CW superposition signal is detected and the may be a distance precision reference time.

The control unit, the distance ( ) is calculated based on Equations 2 to 4, and Equation 2 is, And, Equation 3 above is, , and Equation 4 is, and the above is the speed of light, is the minimum detection distance, may be the maximum detection distance.

The control unit may set the distance precision reference time (as a time standard for determining the minimum detection distance and the maximum detection distance) ), but the distance accuracy reference time may be variable.

The noise filtering criterion is a reference voltage set so that the comparator can determine signals other than the CW superimposed signal as noise ( ) can be.

The control unit, the overlapping time ( ) may occur, the preset CW output time may be set.

The control unit may measure the distance based on a CW overlapping signal received first among the CW overlapping signals output through the comparator.

The overlapping time ( ) section, a frequency detection unit for measuring a Doppler frequency of the CW superposition signal, wherein the control unit may measure speed using the Doppler frequency of the CW superposition signal obtained through the frequency detection unit.

The signal generator may include an enable (EN) terminal at an input terminal to apply the CW signal through the enable terminal, or a single pole, single throw (SPST) switch at an output terminal to apply the CW signal under control of the SPST switch to generate the CW signal.

The CW radar-based distance measuring device may be provided to detect an overlap generated between the transmission signal and the reception signal having different distance determination iteration numbers.

The CW radar-based distance measuring device may include: a received signal detector detecting a received signal of the CW signal; and a reference voltage generator generating a reference voltage according to detection of the received signal.

The control unit may compare a detection time of the received signal with a time of overlap between the transmitted signal and the received signal to check an overlap between the transmitted signal and the received signal having different distance determination iteration numbers.

The control unit, when the end section of the transmission signal having the number of distance determination repetitions of N−1 (N is a natural number equal to or greater than 2) overlaps the beginning section of the received signal having the number of distance determination repetitions of N, the received signal may measure the distance to the object based on the overlapping time point.

The control unit may measure the distance to the object based on the time point at which the received signal is detected, when the start section of the transmission signal having the number of iterations for distance determination of N−1 (N is a natural number equal to or greater than 2) and the end section of the received signal having the number of iterations for distance determination of N overlap.

A distance measurement method according to an embodiment disclosed herein is a CW radar-based distance measurement method performed in a computing device having one or more processors and a memory storing one or more programs executed by the one or more processors, comprising: generating a continuous wave (CW) signal; comparing a transmitted signal and a received signal of the CW signal as the CW signal is generated; Pre-set maximum detection distance operation time ( ), as the CW signal is transmitted to the object, reflected, and then received, the overlapping time at which the transmission and reception sections overlap each other ( ) detecting a CW superimposition signal at the time of occurrence; and controlling the output of the CW signal according to a preset CW output time, counting the number of iterations of distance determination corresponding to the output of the CW signal, and detecting the distance to the object using the CW overlap signal and the number of repetitions of distance determination corresponding to the CW overlap signal.

According to the disclosed embodiments, an effect of being able to measure a distance based on a CW radar can be expected.

According to the disclosed embodiments, it is possible to obtain distance and speed information based on CW radar with relatively simple hardware and signal processing configuration.

According to the disclosed embodiments, it is possible to implement a low-power distance and speed sensor by simply configuring hardware and signal processing.

According to the disclosed embodiments, it is possible to effectively remove distance errors caused by multipath and clutter.

1 is a block diagram for explaining a CW radar-based distance measuring device according to an embodiment;
2 is a circuit diagram for CW radar-based distance measurement according to an embodiment
Figure 3 is an example of the output waveform in each configuration of the circuit diagram of Figure 2
4A and 4B are exemplary diagrams for explaining an operation of a signal generating unit according to an exemplary embodiment;
5 is a diagram illustrating a case in which overlap occurs between CW signals having different distance determination repetition numbers according to an exemplary embodiment;
6 is a circuit diagram showing a CW radar-based distance measurement device according to another embodiment of the present invention.
7 is a circuit diagram showing the configuration of a reference voltage generator in one embodiment
8 is a block diagram for illustrating and describing a computing environment including a computing device according to an exemplary embodiment;

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. The detailed descriptions that follow are provided to provide a comprehensive understanding of the methods, devices and/or systems described herein. However, this is only an example and the present invention is not limited thereto.

In describing the embodiments of the present invention, if it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to the intention or custom of a user or operator. Therefore, the definition should be made based on the contents throughout this specification. Terminology used in the detailed description is only for describing the embodiments of the present invention and should in no way be limiting. Unless expressly used otherwise, singular forms of expression include plural forms. In this description, expressions such as “comprising” or “comprising” are intended to indicate certain characteristics, numbers, steps, operations, elements, parts or combinations thereof, and should not be construed to exclude the existence or possibility of one or more other characteristics, numbers, steps, operations, elements, parts or combinations thereof other than those described.

The present embodiment disclosed below relates to a distance measurement technology using a continuous wave radar (CW radar) structure, and relates to a method of measuring a distance based on time information at which an output is generated by controlling a CW radar signal source according to time.

1 is a block diagram for explaining a CW radar-based distance measurement device according to an embodiment, FIG. 2 is a circuit diagram for CW radar-based distance measurement according to an embodiment, and FIG. 3 is an example of an output waveform in each configuration of the circuit diagram of FIG. 2.

Referring to FIG. 1 , the CW radar-based distance measuring device 100 includes a controller 110, a signal generator 120, a signal comparator 130, a power converter 140, a comparator 150, and a frequency detector 170.

As shown in FIGS. 2 and 3 , in the CW radar-based distance measuring device 100, the controller 110 and the signal generator 120 may be connected in series. In addition, in the CW radar-based distance measuring device 100, the signal comparator 130, the power converter 140, and the comparator 150 may be connected in series based on an area where the CW signal output from the signal generator 120 is transmitted to an object and then reflected and received. Additionally, the comparison unit 150 may be connected to the control unit 110 to measure the distance by detecting the detected CW overlapping signal. In addition, the controller 110 may be additionally connected between the signal comparator 130 and the power converter 140 to receive the Doppler frequency of the CW superposition signal and measure the speed.

In more detail, the signal generating unit 120 may be a component for generating a continuous wave (CW) signal. As shown in FIG. 2 , the CW signal input to the signal generator 120 may be input according to a preset CW output time according to the control of the control unit 110 to be described later.

4A and 4B are exemplary diagrams for explaining an operation of a signal generator according to an exemplary embodiment.

For example, referring to FIGS. 4A and 4B , the signal generator 120 may have an enable (EN) terminal at an input terminal to apply a CW signal through the enable terminal (FIG. 4A), or an SPST (single pole, single throw) switch at an output terminal to apply a CW signal under the control of the SPST switch (FIG. 4B) to generate a CW signal.

The signal comparison unit 130 may be a component for comparing a transmission signal and a reception signal of the CW signal as the CW signal is generated from the signal generation unit 120 .

The power converter 140 has a preset maximum detection distance operation time ( ), as the CW signal is transmitted to the object, reflected, and then received, the overlapping time at which the transmission and reception sections overlap each other ( ) may be a configuration for detecting a CW superimposition signal at the time of occurrence.

Referring to FIG. 2, the maximum detection distance operating time ( ) is the time difference between the transmission and reception of the CW signal ( ) and overlapping time ( ) may be the sum of the times.

Referring to FIG. 3 , the power conversion unit 140 may convert the detected CW superposition signal from a frequency signal form to a DC form and output the converted signal.

The comparator 150 may be configured to compare the CW superposition signal detected through the power converter 140 with a noise filtering criterion and output the result to the control unit 110 . The noise filtering criterion is a reference voltage set so that the comparator 150 can determine signals other than the CW superimposed signal as noise ( ) can be.

Referring to FIG. 3, the reference voltage (multipath) and the signal by clutter can be filtered. ) is set, the comparator 150 can block the influence of multipath and clutter in advance. At this time, the reference voltage ( ) can be arbitrarily set by the operator.

The frequency detection unit 170 is an overlapping time ( ) section, it may be a configuration for measuring the Doppler frequency of the CW superposition signal.

The control unit 110 may be configured to control the output of the CW signal to the signal generator 120 according to a preset CW output time, count the number of iterations (N) of distance determination corresponding to the output of the CW signal, and detect the distance using the CW overlapping signal and the number of repetitions of distance determination corresponding to the CW overlapping signal. In this case, the number of iterations of distance determination corresponding to the CW overlapping signal may mean the number of repetitions of distance determination at the time when the CW overlapping signal is sensed.

The controller 110 controls the overlapping time ( ) may occur, and a preset CW output time may be set.

In this embodiment, for distance detection, overlapping time ( ) must exist. Time difference between transmission and reception of CW signal ( ) is large, so the overlapping time ( ) does not exist, distance detection may not be possible. Therefore, in this embodiment, the overlapping time ( ) can occur and the detection range can be set.

The control unit 110 may check whether a CW superimposition signal is detected through the power converter 140 while increasing or decreasing the number of iterations (N) of distance determination whenever a CW signal is output. That is, while increasing N from 0 or decreasing N from the maximum value, the controller 110 controls the overlap time ( ) can be checked.

The controller 110 determines the maximum detection distance operating time ( ) to the minimum detection distance operating time ( ), the number of repetitions of distance determination (N) and the reference time for distance precision ( ) can be calculated based on

The controller 110 determines the maximum detection distance operating time ( ) can be calculated according to Equation 1.

(Equation 1)

remind is the minimum detection distance operation time, is the number of iterations of distance determination at the time when the CW superposition signal is detected and the may be a distance precision reference time.

The control unit 110 is a distance ( ) can be calculated based on Equations 2 to 4.

(Equation 2)

(Equation 3)

Referring to Figures 2 and 3, at this time, Means the time difference between the transmission time and the reception time of the CW signal, and may mean the time difference between the transmission time when the CW signal (Tx in FIGS. 2 and 3) is provided to the object through the transmit antenna unit and the reception time when the CW signal (Rx in FIGS. 2 and 3) is received from the object through the receive antenna unit. The C may mean the speed of light.

(Equation 4)

remind is the speed of light, is the minimum detection distance, may be the maximum detection distance.

the above-mentioned distance ( )Is Is the distance obtained based on , and the minimum detection distance ( )Is is the distance obtained based on , and the maximum detection distance ( )Is It may be a distance obtained based on .

The control unit 110 increases N from 0 or decreases N from the maximum value for the overlapping time ( ) can be confirmed. for example, In the overlapping time ( ) is not generated, and the output of the power conversion unit 140 is "0", can be also, In the overlapping time ( ) is generated and the output of the power converter 140 is detected can be

The control unit 110 is a distance precision reference time (time standard for determining the minimum detection distance and maximum detection distance) ) is set, but the distance accuracy reference time may be variable.

In this embodiment, the distance precision reference time ( ), the measured distance accuracy can be determined. for example, this 10ns When N is 1 ns and N is 100, the minimum detection distance is 1.5 m, the maximum detection distance is 16.5 m, and the distance accuracy is 15 cm. That is, the controller 110 may perform distance measurement in units of 15 cm.

The controller 110 controls the distance precision reference time ( ) can be set or varied, and generation can be easier than time control required when generating a short pulse.

The control unit 110 may measure the distance based on the CW overlapping signal received first among the CW overlapping signals output through the comparator 150 .

The control unit 110 may measure the speed using the Doppler frequency of the CW superposition signal obtained through the frequency detection unit 170.

Meanwhile, overlap may occur between CW signals having different distance determination repetition numbers depending on the distance to the object. That is, when the distance between the CW radar-based distance measuring device 100 and the object is greater than a predetermined distance, overlap may occur between CW signals having different distance determination iteration numbers. This will be described with reference to FIG. 5 .

5 is a diagram illustrating a case in which overlap occurs between CW signals having different distance determination repetition numbers according to an exemplary embodiment. Referring to (a) of FIG. 5 , an overlap section between CW signals having different distance determination repetition numbers may occur in a terminal section of a transmission signal. That is, there may be a case (case 1) in which the end section of the transmission signal having N-1 distance determination repetitions and the beginning section of the received signal having N distance determination repetitions overlap each other. In the case of the first case, the distance to the object may be measured based on the point of time when the received signals overlap.

Referring to (b) of FIG. 5 , an overlapping period between CW signals having different distance determination repetition numbers may occur in a start period of a transmission signal. That is, there may be a case where the start section of the transmitted signal having N-1 distance determination repetitions and the end section of the received signal having N distance determination repetitions overlap each other (case 2). In case of the second case, the distance to the object may be measured based on the time point at which the reception signal is received.

As such, when overlapping occurs between CW signals having different distance determination repetition numbers, there may be a first case (FIG. 5(a)) and a second case (FIG. 5(b)). At this time, the first case and the second case may be distinguished by comparing the reception time of the received signal and the time when the overlap occurs.

6 is a circuit diagram illustrating a CW radar-based distance measuring device according to another embodiment of the present invention. FIG. 6 is to enable distance measurement even when overlapping occurs between CW signals having different distance determination iteration numbers. Here, a description will focus on a difference from the embodiment shown in FIG.

Referring to FIG. 6 , the CW radar-based distance measuring device 100 may further include a received signal detector 180 and a reference voltage generator 190.

The received signal detector 180 may detect a received signal that is returned after the CW signal is reflected by an object. The received signal detector 180 may be configured to separately detect only a received signal reflected from an object.

The reference voltage generator 190 may generate a reference voltage as the received signal is detected by the received signal detector 180 . That is, the reference voltage generator 190 may not generate the reference voltage before the received signal is detected, but generate the reference voltage at the time when the received signal is detected. The reference voltage generator 190 may supply the generated reference voltage Vref to the comparator 150 and the control unit 110 , respectively.

7 is a circuit diagram showing the configuration of the reference voltage generator 190 in one embodiment. Referring to FIG. 7 , when the received signal is applied from the received signal detector 180, the reference voltage generator 190 generates the reference voltage Vref by operating the resistance divider circuit as the switch SW is turned on. On the other hand, if the received signal is not applied from the received signal detector 180, the switch SW is in an OFF state.

Here, the control unit 110 may measure the distance to the object by determining it as a first case when an overlap section occurs while the received signal is received, and if an overlap section occurs after a predetermined time elapses after the reception signal is received, the controller 110 determines it to be a second case and measures the distance to the object. At this time, when the received signal is received, a reference voltage is generated and transmitted to the comparator 150, so the output of the comparator 150 is in a LOW state, and when an overlap section occurs later, the output of the comparator 150 is changed to a HIGH state to confirm the second case.

8 is a block diagram illustrating a computing environment including a computing device according to an exemplary embodiment. In the illustrated embodiment, each component may have different functions and capabilities other than those described below, and may include additional components other than those described below.

The illustrated computing environment 10 includes a computing device 12 . In one embodiment, computing device 12 may be a CW radar based ranging device 100 .

Computing device 12 includes at least one processor 14 , a computer readable storage medium 16 and a communication bus 18 . Processor 14 may cause computing device 12 to operate according to the above-mentioned example embodiments. For example, processor 14 may execute one or more programs stored on computer readable storage medium 16 . The one or more programs may include one or more computer-executable instructions, which when executed by processor 14 may be configured to cause computing device 12 to perform operations in accordance with an example embodiment.

Computer-readable storage medium 16 is configured to store computer-executable instructions or program code, program data, and/or other suitable form of information. Program 20 stored on computer readable storage medium 16 includes a set of instructions executable by processor 14 . In one embodiment, computer-readable storage medium 16 may be memory (volatile memory such as random access memory, non-volatile memory, or a suitable combination thereof), one or more magnetic disk storage devices, optical disk storage devices, flash memory devices, other forms of storage medium that can be accessed by computing device 12 and store desired information, or any suitable combination thereof.

Communications bus 18 interconnects various other components of computing device 12, including processor 14 and computer-readable storage medium 16.

Computing device 12 may also include one or more input/output interfaces 22 and one or more network communication interfaces 26 that provide interfaces for one or more input/output devices 24 . An input/output interface 22 and a network communication interface 26 are connected to the communication bus 18 . Input/output device 24 may be coupled to other components of computing device 12 via input/output interface 22 . Exemplary input/output devices 24 may include input devices such as pointing devices (such as a mouse or trackpad), keyboards, touch input devices (such as a touchpad or touchscreen), voice or audio input devices, sensor devices of various kinds, and/or imaging devices, and/or output devices such as display devices, printers, speakers, and/or network cards. The exemplary input/output device 24 may be included inside the computing device 12 as a component constituting the computing device 12, or may be connected to the computing device 12 as a separate device distinct from the computing device 12.

As described above, the present embodiment is useful for implementing a low-cost distance detection sensor as a technology capable of measuring distance based on a CW radar configuration without implementing a complex signal source or signal processing, and the applied circuit is relatively simple and complex calculations are omitted, thereby providing a low-power sensing technology.

In addition, the present embodiment can improve the reliability of result values of distance information by removing noise that may occur due to multipath or clutter in advance.

In addition, this embodiment can acquire both distance information and speed information in the same device by controlling the output time of the CW signal.

Representative embodiments of the present invention have been described in detail above, but those skilled in the art will understand that various modifications are possible to the above-described embodiments without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments and should not be defined, and should be defined by not only the claims to be described later, but also those equivalent to these claims.

10: Computing environment
12: computing device
14: Processor
16: computer readable storage medium
18: communication bus
20: program
22: I/O interface
24: I/O device
26: network communication interface
100: CW radar-based distance measuring device
110: control unit
120: signal generator
130: signal comparison unit
140: power conversion unit
150: comparison unit
170: frequency detection unit
180: received signal detection unit
190: reference voltage generator

Claims (18)

a signal generator for generating a CW (Continuous Wave) signal;
a signal comparison unit for comparing a transmission signal and a reception signal of the CW signal as the CW signal is generated from the signal generation unit;
Pre-set maximum detection distance operating time ( ), as the CW signal is transmitted to the object, reflected, and then received, the overlapping time at which the transmission and reception sections overlap each other ( ) power conversion unit for detecting the CW superposition signal at the time of occurrence;
a comparator for comparing the CW superposition signal detected through the power converter with a noise filtering criterion and outputting the result to a control unit; and
A CW radar-based distance measuring device including a controller for controlling the output of the CW signal to the signal generator according to a preset CW output time, counting the number of iterations of distance determination corresponding to the output of the CW signal, and detecting a distance to the object using the CW overlapping signal and the number of repetitions of distance determination corresponding to the CW overlapping signal.
The method of claim 1,
The control unit,
and checking whether the CW overlapping signal is detected through the power converter while increasing or decreasing the number of iterations of the distance determination whenever the CW signal is output.
The method of claim 1,
The power converter,
and converting the detected CW superposition signal from a frequency signal form to a DC form and outputting the CW radar-based distance measuring device.
The method of claim 1,
The control unit,
The maximum detection distance operation time ( ) to the minimum detection distance operating time ( ), the number of repetitions of distance determination (N) and the reference time for distance precision ( ) CW radar-based distance measuring device comprising calculating based on.
The method of claim 4,
The control unit,
The maximum detection distance operation time ( ) is calculated according to Equation 1,
Equation 1 above is
ego,
remind is the minimum detection distance operation time, is the number of iterations of distance determination at the time when the CW superposition signal is detected and the CW radar-based distance measuring device comprising a distance precision reference time.
The method of claim 5,
The control unit,
above distance ( ) is calculated based on Equations 2 to 4,
Equation 2 above is ego,
Equation 3 above is is,
Equation 4 above is ego,
remind is the speed of light, is the minimum detection distance, CW radar-based distance measuring device including that is the maximum detection distance.
The method of claim 6,
The control unit,
The distance precision reference time as a time standard for determining the minimum detection distance and the maximum detection distance ( ) is set, but the distance precision reference time is variable.
The method of claim 1,
The noise filtering criterion is a reference voltage set so that the comparator can determine signals other than the CW superimposed signal as noise ( ) A CW radar-based ranging device comprising:
The method of claim 1,
The control unit,
The overlapping time ( ), CW radar-based distance measuring device comprising setting the preset CW output time in consideration of occurrence.
The method of claim 1,
The control unit,
and measuring the distance based on a first received CW overlapping signal among the CW overlapping signals output through the comparator.
The method of claim 1,
The overlapping time ( ) further comprising a frequency detector for measuring the Doppler frequency of the CW superposition signal in the interval,
The control unit,
and measuring speed using a Doppler frequency of the CW superposition signal obtained through the frequency detector.
The method of claim 1,
The signal generator,
A CW radar-based distance measurement device including an enable (EN) terminal at an input terminal and applying the CW signal through the enable terminal, or a SPST (single pole, single throw) switch at an output terminal and applying the CW signal according to control of the SPST switch to generate the CW signal.
The method of claim 1,
The CW radar-based distance measurement device,
A CW radar-based distance measuring device provided to detect an overlap generated between the transmission signal and the reception signal having different distance determination iteration numbers.
The method of claim 13,
The CW radar-based distance measurement device,
a received signal detector detecting a received signal of the CW signal; and
CW radar-based distance measuring device further comprising a reference voltage generator for generating a reference voltage according to detection of the received signal.
The method of claim 14,
The control unit,
A CW radar-based distance measurement device for checking an overlap between a transmission signal having a different distance determination iteration number and a reception signal by comparing a detection time of the received signal and a time when an overlap between the transmission signal and the reception signal occurs.
The method of claim 15
The control unit,
When the end section of a transmission signal having N-1 (N is a natural number equal to or greater than 2) and the start section of a received signal having N distance determination repetitions overlap, a CW radar-based distance measurement device for measuring the distance to an object based on the point at which the received signal overlaps.
The method of claim 15
The control unit,
When the start section of a transmission signal having N-1 (N is a natural number equal to or greater than 2) and the end section of a received signal having N distance determination repetitions overlap, a CW radar-based distance measurement device for measuring the distance to an object based on the time point at which the received signal is detected.
one or more processors; and
A CW radar-based distance measuring method performed in a computing device having a memory for storing one or more programs executed by the one or more processors,
Step for generating a CW (Continuous Wave) signal;
comparing a transmitted signal and a received signal of the CW signal as the CW signal is generated;
Pre-set maximum detection distance operating time ( ), as the CW signal is transmitted to the object, reflected, and then received, the overlapping time at which the transmission and reception sections overlap each other ( ) detecting a CW superimposition signal at the time of occurrence; and
Controlling the CW signal output according to a preset CW output time, counting the number of iterations of distance determination corresponding to the output of the CW signal, and detecting a distance to the object using the CW overlapping signal and the number of repetitions of distance determination corresponding to the CW overlapping signal. Detecting a distance to the object.