KR101897862B1 - Pulsed Doppler Radar and Operating Method of the Same - Google Patents
Pulsed Doppler Radar and Operating Method of the Same Download PDFInfo
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- KR101897862B1 KR101897862B1 KR1020160011302A KR20160011302A KR101897862B1 KR 101897862 B1 KR101897862 B1 KR 101897862B1 KR 1020160011302 A KR1020160011302 A KR 1020160011302A KR 20160011302 A KR20160011302 A KR 20160011302A KR 101897862 B1 KR101897862 B1 KR 101897862B1
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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
- G01S7/28—Details of pulse systems
- G01S7/282—Transmitters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
- G01S13/50—Systems of measurement based on relative movement of target
- G01S13/52—Discriminating between fixed and moving objects or between objects moving at different speeds
- G01S13/522—Discriminating between fixed and moving objects or between objects moving at different speeds using transmissions of interrupted pulse modulated waves
- G01S13/524—Discriminating between fixed and moving objects or between objects moving at different speeds using transmissions of interrupted pulse modulated waves based upon the phase or frequency shift resulting from movement of objects, with reference to the transmitted signals, e.g. coherent MTi
- G01S13/5248—Discriminating between fixed and moving objects or between objects moving at different speeds using transmissions of interrupted pulse modulated waves based upon the phase or frequency shift resulting from movement of objects, with reference to the transmitted signals, e.g. coherent MTi combining a coherent MTI processor with a zero Doppler processing channel and a clutter mapped memory, e.g. MTD (Moving target detector)
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- G01S2007/4013—
Abstract
The present invention relates to a pulse Doppler radar and a control method thereof, and includes a voltage regulating oscillator for generating a signal, and the voltage regulating oscillator operates to generate a signal for a period of the operation period of the pulse Doppler radar to have periodicity.
Description
The present invention relates to a pulse Doppler radar and a method of operating the same.
The present invention also relates to a CMOS radar capable of replacing a PIR sensor capable of sensing motion of an object, and includes an efficient and suitable method for implementing the CMOS radar.
Pulsed Doppler radar can be used in motion sensor applications. A motion sensor is a sensor that literally senses and reacts to the movement of an object. It is widely used in automatic doors, toilet lights, and toilets. There are various methods such as the ultra sonic method for the motion sensor method, but the most widely used method is PIR (Passive Infra Red) method.
The PIR method is a method using Infra-Red. To realize this, a pyroelectric material having hyperconductivity is used. The PIR sensor using the superconducting material changes the electrical properties depending on the temperature. Therefore, the superconducting material is affected by external conditions such as temperature and climate, and is difficult to use outdoors.
In order to apply the superconducting material to the PIR type sensor module for the PIR method, a separate process is required in addition to a conventional electronic integrated circuit design, and a comparator or a readout circuit is separately required. For this reason, the cost of manufacturing the entire module is high in the PIR system.
In addition, the maximum working distance is limited because it operates through heat.
However, despite these disadvantages, the sensor itself is widely used in the near-room indoor motion sensor market because of its inherent nature of the material, with little power consumption and power consumption within the module circuitry. Therefore, in order to replace the PIR sensor, there is a need for technology that can operate at the maximum working distance and external condition, and can be produced at a lower cost.
On the other hand, the motion sensor system using the radar structure is not affected by climatic conditions unlike the PIR system because it uses electromagnetic waves. In the past, radar systems have not been widely used because of the lack of competitiveness and power consumption due to problems such as power consumption and price. However, as the CMOS process progresses, the price competitiveness increases with the increase of the yield.
An object of the present invention is to provide a pulse Doppler radar capable of reducing power consumption while maintaining stable operation, and a method of operating the same.
The pulse Doppler radar according to an embodiment of the present invention includes a voltage regulating oscillator for generating a signal, and the voltage regulating oscillator operates to generate a periodic signal during a certain period of the operating period of the pulse Doppler radar.
Also, a pulse Doppler radar according to an embodiment of the present invention includes: a voltage regulating oscillator for generating a signal; A first buffer for amplifying a signal generated by the voltage-controlled oscillator; A second buffer for amplifying a part of the amplified signal in the first buffer; A terminal amplifier for amplifying the amplified signal in the second buffer; A transmitter for transmitting the amplified signal from the terminal amplifier to the outside; And a receiver stage amplifier for amplifying another part of the signal amplified in the first buffer, wherein the voltage-controlled oscillator generates a signal during a certain period of the operation period of the pulse Doppler radar and operates to have a periodicity.
The voltage-controlled oscillator can generate a signal with a duty ratio of 2% or more.
Wherein the terminal amplifier amplifies the signal for a predetermined period of the operation period of the pulse Doppler radar, and the period in which the terminal amplifier amplifies the signal is determined by the voltage controlled oscillator May be shorter than a period in which the signal is generated, and the terminal amplifier may amplify the signal with a duty ratio of 0.2% or more.
And a second buffer for amplifying a signal generated by the voltage-controlled oscillator, wherein the second buffer amplifies the signal for a certain period of the operation period of the pulse Doppler radar, and the period for amplifying the signal by the second buffer is And the second buffer may amplify the signal with a duty ratio of 0.2% or more.
Wherein the receiver amplifier amplifies the signal for a predetermined period of the operation period of the pulse Doppler radar, and the period during which the receiver amplifier amplifies the signal is the terminal It may be longer than the period the amplifier amplifies the signal. Also, the receiver stage amplifier can amplify the signal with a duty ratio of 2% or more.
A signal receiving unit for receiving an external signal; A low noise amplifier for amplifying a signal received by the signal receiver; And a mixer for converting a frequency of a signal received by the low noise amplifier and the signal receiving unit.
The termination amplifier may include a driving amplifier and a power amplifier, and the power amplifier may operate to have periodicity.
And a transmission unit for transmitting a signal generated from the voltage-controlled oscillator to the outside, wherein the terminal amplifier is capable of generating a signal for 1/1000 of a time when the voltage-controlled oscillator generates a signal, The signal may have a periodicity of 100 ns while the voltage-controlled oscillator generates a signal.
The apparatus may further include an analog interface for receiving a signal from the mixer.
A method of controlling a pulse Doppler radar according to an embodiment of the present invention includes generating a signal during a certain period of an operation period of a pulse Doppler radar by a voltage regulation oscillator.
More specifically, a method of controlling a pulse Doppler radar according to an embodiment of the present invention includes the steps of: generating a signal during a certain period of an operation period of a pulse Doppler radar by a voltage-controlled oscillator; Receiving a signal generated from the voltage-controlled oscillator and amplifying the first buffer; The second buffer receiving and amplifying a portion of the amplified signal in the first buffer; Receiving an amplified signal from the second buffer and amplifying the amplified signal; Receiving a signal amplified by the terminal amplifier and transmitting the amplified signal to the outside; And receiving and amplifying another part of the amplified signal in the first buffer in the receiver stage amplifier.
The pulse Doppler radar and its method of operation according to an embodiment of the present invention can reduce power consumption while maintaining stable operation.
1 shows a pulse Doppler radar according to an embodiment of the present invention.
2 shows a timing diagram of a voltage-controlled oscillator, a receiver amplifier, a second buffer, and a power amplifier of a pulse Doppler radar according to an embodiment of the present invention.
3 shows an output signal of a pulse Doppler radar according to an embodiment of the present invention.
Figure 4 shows a power amplifier.
Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, the embodiments of the present invention can be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below. Further, the embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art. Accordingly, the shapes and sizes of the elements in the drawings may be exaggerated for clarity of description, and the elements denoted by the same reference numerals in the drawings are the same elements. In the drawings, like reference numerals are used throughout the drawings. In addition, "including" an element throughout the specification does not exclude other elements unless specifically stated to the contrary.
Pulse doppler radar
The pulse Doppler radar according to an embodiment of the present invention includes a voltage regulating oscillator for generating a signal, and the voltage regulating oscillator operates to generate a periodic signal during a certain period of the operating period of the pulse Doppler radar.
More specifically, a pulse Doppler radar according to an embodiment of the present invention includes: a voltage regulation oscillator for generating a signal; A first buffer for amplifying a signal generated by the voltage-controlled oscillator; A second buffer for amplifying a part of the amplified signal in the first buffer; A terminal amplifier for amplifying the amplified signal in the second buffer; A transmitter for transmitting the amplified signal from the terminal amplifier to the outside; And a receiver stage amplifier for amplifying another part of the signal amplified in the first buffer, wherein the voltage-controlled oscillator outputs a signal for a predetermined period of time during a certain period of the operation period of the pulse Doppler radar, Lt; / RTI >
In a conventional voltage radar system, the voltage-controlled oscillator continuously operates and generates a signal while the radar system is operating for normal operation of the pulse Doppler radar. This operation was intended to maintain the stable operation and accuracy of the radar system, but there was considerable power consumption to continuously operate the voltage-controlled oscillator.
Also, in order to continuously amplify the signal generated from the voltage-controlled oscillator, the second buffer, the receiver amplifier, and the terminal amplifier have to be continuously amplified. As described above, since this operation consumes a considerable amount of power, there is a limitation in applying the radar system to fields requiring low power consumption.
In a pulsed Doppler radar according to an embodiment of the present invention, a voltage-regulated oscillator (VCO) may generate a signal for a predetermined period of time. Also, the signal amplified by the receiver amplifier can amplify the signal only for a certain period of the cycle in which the pulse Doppler radar operates. In addition, the second buffer can also amplify the signal for only a certain period of the cycle in which the pulse Doppler radar operates. Also, the termination amplifier can also amplify the signal for only a certain period of the period in which the pulse Doppler radar operates.
Thus, power consumption can be reduced by activating each configuration for only a portion of the period of the period in which the pulse Doppler radar operates.
More specifically, the voltage-controlled oscillator can generate a signal with a duty ratio of 2% or more. For example, if the radar operates for 500 microseconds, the voltage-controlled oscillator can generate a signal for 10 microseconds. As such, the voltage-controlled oscillator generates a signal for 10 μs, which is a part of 500 μs, thus reducing power consumption.
Although the power consumption can be reduced by lowering the duty ratio, when the duty ratio at which the voltage-controlled oscillator generates a signal is too low, there is a problem that it is difficult to detect a signal due to insufficient amount of power transmitted and received. In addition, the duty ratio can be limited by the frequency specification and the setting time.
Also, the termination amplifier amplifies the signal for a certain period of the operation period of the pulse Doppler radar, and the period for amplifying the signal by the termination amplifier may be shorter than the period for which the voltage regulation oscillator generates the signal.
This is because the signal amplified by the terminal amplifier is a signal generated by the voltage-controlled oscillator. Because of the high power dissipation in the termination amplifier, power dissipation is high even if the termination amplifier is operated with the same duty ratio as the voltage regulation oscillator. Therefore, the termination amplifier can minimize the power consumption due to the signal amplification by amplifying the signal at a period shorter than the period of the signal generated by the voltage-controlled oscillator. The termination amplifier may amplify the signal with a duty ratio of 0.2% or more. To this end, the power to the termination amplifier may be supplied at a duty ratio of 0.2% or more.
The receiver amplifier may amplify the signal for a predetermined period of the operation period of the pulse Doppler radar. The operation period of the receiver stage amplifier can not be set equal to or smaller than the operation period of the end stage amplifier because it takes time until a signal transmitted to the outside through the terminal amplifier collides against an external object and returns. Therefore, the period during which the receiver amplifier amplifies the signal can be set longer than the period during which the terminal amplifier amplifies the signal.
It is more preferable that the receiver amplifier amplify the signal with a duty ratio of 2% or more. This operation allows stable operation while reducing power consumption.
The operating period of the second buffer is also adjusted to reduce power consumption. The second buffer amplifies the signal for a predetermined period of the operation period of the pulse Doppler radar and the period for amplifying the signal by the second buffer may be shorter than the period for which the voltage regulation oscillator generates the signal.
The second buffer may amplify the signal with a duty ratio of 0.2% or more. Since the amplified signal in the second buffer is amplified by the termination amplifier, the second buffer and the termination amplifier can be set to operate for the same period.
Hereinafter, the embodiment of the present invention will be described in more detail with reference to Fig. 1 shows a
Referring to FIG. 1, a
The
An operation example of the
The signal generated by the voltage-controlled oscillator 111 is first amplified by passing through the
The signal transmitted to the
When the signal transmitted to the outside is reflected by an external object, the signal is received by the
The signal reflected by the external object may enter the
The
Hereinafter, each configuration will be described in more detail.
The
The voltage-controlled oscillator 111 can control a frequency generated by controlling an input voltage. In one embodiment, the signal generated by the voltage-controlled oscillator 111 may be a sinusoidal signal having a frequency of 24 GHz. In addition, the voltage-controlled oscillator 111 can generate a signal only for a predetermined time.
The
The
The transmitting
The
The
FIG. 2 illustrates a timing diagram of a voltage-controlled oscillator, a receiver amplifier, a second buffer, and a power amplifier of a pulse Doppler radar according to an embodiment of the present invention.
Referring to FIG. 2, the voltage-controlled oscillator generates a signal for a duty ratio of 2% or more, the receiver amplifier amplifies a signal for a duty ratio of 2% or more, Amplifies the signal for a duty ratio of 0.2% or more, and the terminal amplifier can amplify the signal for a duty ratio of 0.2% or more.
More preferably, the voltage-controlled oscillator generates a signal for a duty ratio of 2% or more, the receiver amplifier amplifies the signal for a duty ratio of 2% or more, and the second buffer is 0.2 , And the terminal amplifier can amplify the signal for a duty ratio of 0.2% or more.
It is difficult to have a duty ratio of less than 2% in the voltage-controlled oscillator and the receiver amplifier, and it is difficult for the second buffer and the terminal amplifier to have a duty ratio of less than 0.2%. This is because of the frequency specification and the setting time.
The 24 GHz pulse Doppler radar has an allowable frequency band of 24 to 24.25 GHz. A pulse of 10 ns means 200 MHz bandwidth in the frequency domain and corresponds to 0.2 GHz. In the time domain, the pulse width is inversely proportional to the bandwidth in the frequency domain. Therefore, if the pulse width is made smaller, the allowable bandwidth may exceed 0.25 GHz.
Further, when the switch continuously performs On and Off operations, it is necessary to maintain a certain time between the On and Off states. That is, in order to switch the switch from the off state to the on state, it takes more than a certain time for all the circuits to operate stably, which is called settling time. In the embodiment of the present invention, it is also possible to design the switch to have a margin of more than the set time to perform the pulse operation so as to have the periodicity. Particularly, in the case of a power amplifier including a termination amplifier, more particularly, a power amplifier included in the termination amplifier, it is difficult to reduce the duty ratio to less than 0.2% in consideration of the set time. In the case of the voltage-controlled oscillator, since the setting time is long due to the characteristics of the device, it is difficult to make the duty ratio smaller than 2%.
Unlike the PIR sensor, the Doppler radar generates a signal (radio wave) by consuming electric power and uses it to detect the motion of the object. Due to the nature of these Doppler radars, it is necessary to operate continuously while required to sense movement of the object. Therefore, the power consumption may be larger than that of the PIR sensor. The pulse Doppler radar according to the embodiment of the present invention can reduce power consumption by performing a pulse operation in which the configuration of the voltage regulating generator or the like is operated at a predetermined time interval.
In order to reduce the power consumption of the Doppler radar, a duty ratio, that is, a ratio of a cycle in which a pulse for the whole cycle is on may be made small. However, if this value is too small, It may not be sufficiently large to properly detect the signal. Therefore, a duty ratio of at least a certain level must be secured.
In the case of a voltage-controlled oscillator, the pulse-on state must be secured for about 10 μs because the performance of the entire circuit is influenced and the on and off operation time is slow. Thus, if the total period is 500 μs, the voltage-controlled oscillator can operate for 10 μs, ie, a duty ratio of 2% or greater.
In general, the termination amplifier requires a large amplified signal to be transmitted to the transmission part, so it consumes a large amount of power and occupies a large part of the power consumption of the entire circuit. Thus, significant power dissipation can occur even when operating at the same duty ratio as the voltage regulated oscillator.
The pulse doppler radar according to the embodiment of the present invention minimizes power consumption by setting the period in which the power amplifier (PA) included in the termination amplifier, particularly, the termination amplifier, performs the amplification action to be shorter than the operation period of the voltage regulating oscillator.
It is necessary to increase the signal to noise ratio (SNR) in order to properly detect the signal in the signal receiving unit. In order to increase the above-mentioned signal-to-noise ratio, about 100 integrations are required. Therefore, the terminal amplifier can be set to operate only in 10 ns out of 100 ns, which is the period of 10 μs divided by 100, in which the voltage-controlled oscillator operates. Thus, the power consumed by the termination amplifier can be reduced by operating the termination amplifier with a duty ratio of 0.2% or more over the entire period. At this time, the termination amplifier can operate for 1/1000 hours of the time when the voltage-controlled oscillator generates a signal.
As described above, a signal transmitted to the outside through the transmission unit through the terminal amplifier is reflected by an external object and enters the signal receiving unit. However, it takes a certain time until the transmitted signal is received again. Because of this time difference, the receiver amplifier can not be set to operate only for the same period as the terminal amplifier, and the operation period of the receiver amplifier must be set longer than the operation period of the terminal amplifier.
The receiver amplifier may operate at the same duty ratio as the voltage-controlled oscillator. More specifically, the receiver amplifier may amplify the signal at a duty ratio of 2% or more.
The second buffer may serve to amplify the signal generated by the voltage-controlled oscillator by sending it to the termination amplifier. The second buffer amplifies the signal during a certain period of the operation period of the pulse Doppler radar and the period during which the second buffer amplifies the signal may be shorter than the period during which the voltage adjustment oscillator generates the signal . More specifically, the second buffer can amplify the signal with a duty ratio of 0.2% or more.
As described above, since it is necessary to integrate about 100 times in order to increase the signal-to-noise ratio in order to properly detect the signal in the signal receiving unit, it is necessary to integrate only 10 ns out of 100 ns The duty cycle of the second buffer for outputting the signal to the termination amplifier can be set to the same as that of the termination amplifier. By operating in this manner, the power consumed in the second buffer can be reduced.
3 shows an output signal of a pulse Doppler radar according to an embodiment of the present invention.
As described above, when the voltage-controlled oscillator and the termination amplifier operate so as to have periodicity, the signal transmitted from the transmission section has the same periodicity as the operation period of the termination amplifier. More specifically, the signal transmitted from the transmitter has a duty ratio of 0.2% or more, and may have a periodicity for transmitting a signal by 10 ns for 100 ns.
The operation of transmitting the signal having the periodicity in the transmitter may be set to be performed only during the generation of the signal in the voltage-controlled oscillator. While no signal is generated by the voltage-controlled oscillator, no amplified signal is generated in the terminal amplifier because there is no signal to be amplified. Thus, the operation of causing the transmitter to transmit a signal with periodicity can be made only while the voltage-controlled oscillator generates a signal.
Since the conventional radar system continuously generates signals, the voltage-controlled oscillator, the terminal amplifier and the like are continuously operated, and the transmitting unit continuously transmits the signals. On the other hand, the pulse Doppler radar according to the embodiment of the present invention controls the operation of each configuration so as to have a constant period, so that power consumption can be reduced.
The power consumed by the voltage-controlled oscillator can be calculated as the product of the supply current and the supply current.
In the comparative example in which the voltage-controlled oscillator continues to operate, 6.8 mA (consumed current) x 1.5 V (supply voltage) = 10.2 mW can be calculated.
Since the voltage-controlled oscillator of the embodiment operates to have a periodicity with a duty ratio of 2%, the power consumption of the voltage-controlled oscillator can be calculated as 10.2 mW x 2% = 0.2 mW.
The power dissipated in the termination amplifier can be calculated as the product of the dissipation current and VDD. Further, when the termination amplifier is composed of the driving amplifier (DA) and the power amplifier (PA), the consumed power of the entire termination amplifier can be calculated as the sum of the consumed power of the driving amplifier and the power amplifier.
In a comparative example where the termination amplifier continues to operate, the power consumption of the drive amplifier can be calculated as 42.1 mA (consumed current) x 1.8 V (VDD) = 75.8 mW, the power consumption of the power amplifier is 72.5 mA × 1.8 V (VDD) = 130.5 mW. Therefore, the power consumption of the termination amplifier is 75.8 mW + 130.5 mW = 206.3 mW.
Since the termination amplifier of the embodiment operates to have periodicity with a duty ratio of 0.2%, the power consumption of the termination amplifier can be calculated as 206.3 mW x 0.2% = 0.4126 mW.
Therefore, the power consumption of the comparative example is 216.5 mW, whereas the power consumption of the embodiment is only 0.6 mW.
Figure 4 shows a power amplifier.
Referring to FIG. 4, the termination amplifier included in the pulse Doppler radar of the present invention may include a power amplifier. In addition, the power amplifier may include a
Control method of pulse Doppler radar
A method of controlling a pulse Doppler radar according to an embodiment of the present invention includes generating a signal during a certain period of an operation period of a pulse Doppler radar by a voltage regulation oscillator.
Also, a method of controlling a pulse Doppler radar according to an embodiment of the present invention includes the steps of: generating a signal during a certain period of an operation period of a pulse Doppler radar by a voltage-controlled oscillator; Receiving a signal generated from the voltage-controlled oscillator and amplifying the first buffer; The second buffer receiving and amplifying a portion of the signal amplified in the first buffer; Receiving an amplified signal from the second buffer and amplifying the amplified signal; Receiving a signal amplified by the terminal amplifier and transmitting the amplified signal to the outside; And receiving and amplifying another part of the amplified signal in the first buffer in the receiver stage amplifier.
As described above, the voltage-controlled oscillator operates with a predetermined periodicity to reduce power consumption.
Also, the second buffer for amplifying the signal of the voltage-controlled oscillator and outputting the amplified signal to the terminal amplifier, and the terminal amplifier for amplifying the signal of the second buffer and transmitting the amplified signal to the transmitter may also operate with a predetermined periodicity to reduce power consumption.
And the second buffer and the terminal amplifier can control to operate with periodicity only during operation of the voltage-controlled oscillator. Further, it can be controlled to operate at a cycle shorter than the period of the voltage-controlled oscillator.
More specifically, when the voltage-controlled oscillator is controlled to operate at a duty ratio of 2% or more, the second buffer or the termination amplifier can be controlled to operate at a duty ratio of 0.2% or more.
Also, the receiver amplifier may be controlled to operate with a periodicity to reduce power consumption, and the receiver amplifier may be controlled to operate at a period longer than the cycle of the second buffer or the terminal amplifier.
The description of each other configuration is omitted in order to avoid redundant description. The present invention is not limited to the above-described embodiment and the accompanying drawings, but is intended to be limited by the appended claims. It will be apparent to those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. something to do.
100: Pulse Doppler radar
111: Voltage regulation oscillator
112: first buffer
113: second buffer
114: termination amplifier
115:
116: Receiver stage amplifier
117: Signal receiver
118: Low-noise amplifier
119: Mixer
120: Analog Interaction
10: Switch
Claims (13)
A voltage regulating oscillator for generating a signal; And
And a terminal amplifier which operates by receiving a signal generated from the voltage-controlled oscillator,
The voltage-controlled oscillator generates a first pulse signal having a first duty ratio in a first period,
Wherein the terminal amplifier operates so as to correspond to a second pulse signal of a second duty ratio in a second period shorter than the first period while the first pulse signal is on based on the first pulse signal. Radar.
Wherein the first duty ratio is at least 2%.
And the second duty ratio is at least 0.2%.
And a second buffer for amplifying a signal generated in the voltage-controlled oscillator.
And a receiver stage amplifier for amplifying a part of a signal generated in the voltage-controlled oscillator.
A signal receiving unit for receiving an external signal;
A low noise amplifier for amplifying a signal received by the signal receiver; And
And a mixer for converting a frequency of a signal received at the low noise amplifier and the signal receiving unit.
Wherein the termination amplifier comprises a drive amplifier and a power amplifier, the power amplifier operating to have a periodicity.
Wherein the terminal amplifier generates a signal for 1/1000 of a time when the voltage-controlled oscillator generates a signal.
And a transmitter for transmitting a signal generated by the voltage-controlled oscillator to the outside,
Wherein the signal transmitted from the transmitter has a periodicity of 100 ns while the voltage-controlled oscillator generates a signal.
Generating a first pulse signal of a first duty ratio at a first period and providing the first pulse signal to an end amplifier; And
And operating the terminal amplifier to correspond to a second pulse signal of a second duty ratio in a second period shorter than the first period while the first pulse signal is on based on the first pulse signal Control method of Doppler radar.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2885807B2 (en) | 1988-10-21 | 1999-04-26 | 東京航空計器株式会社 | Distance detection device |
| JP2005345218A (en) * | 2004-06-02 | 2005-12-15 | Hitachi Ltd | Radar device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH06342062A (en) * | 1993-06-03 | 1994-12-13 | Mitsubishi Electric Corp | Radar apparatus |
| KR100515517B1 (en) * | 2000-06-23 | 2005-09-20 | 이태경 | The position tracking transmitter embedded on shoes |
| KR101776703B1 (en) | 2011-10-14 | 2017-09-08 | 한화테크윈 주식회사 | Ladar and Method for object detecting using ladar |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2885807B2 (en) | 1988-10-21 | 1999-04-26 | 東京航空計器株式会社 | Distance detection device |
| JP2005345218A (en) * | 2004-06-02 | 2005-12-15 | Hitachi Ltd | Radar device |
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