CN110426697A - A kind of radar target detection method and system - Google Patents
A kind of radar target detection method and system Download PDFInfo
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- CN110426697A CN110426697A CN201910606500.2A CN201910606500A CN110426697A CN 110426697 A CN110426697 A CN 110426697A CN 201910606500 A CN201910606500 A CN 201910606500A CN 110426697 A CN110426697 A CN 110426697A
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- 238000001514 detection method Methods 0.000 title claims description 50
- 230000033001 locomotion Effects 0.000 claims description 33
- 238000002156 mixing Methods 0.000 claims description 12
- 238000005070 sampling Methods 0.000 claims description 11
- 238000000354 decomposition reaction Methods 0.000 claims description 10
- 230000005540 biological transmission Effects 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000035945 sensitivity Effects 0.000 description 5
- 230000003321 amplification Effects 0.000 description 4
- 238000003199 nucleic acid amplification method Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 238000012790 confirmation Methods 0.000 description 1
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Classifications
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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
- G01S13/06—Systems determining position data of a target
-
- 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
- G01S13/58—Velocity or trajectory determination systems; Sense-of-movement determination systems
-
- 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
- G01S13/58—Velocity or trajectory determination systems; Sense-of-movement determination systems
- G01S13/62—Sense-of-movement determination
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- Radar Systems Or Details Thereof (AREA)
Abstract
The present invention relates to Radar Technology field more particularly to a kind of radar target detection methods, wherein including step S1, emitting the first radiofrequency signal by transmission antenna group；Step S2, the second radiofrequency signal reflected to form by the first radiofrequency signal is received by receiving antenna group；Step S3, the first radiofrequency signal and the second radiofrequency signal are mixed and form mixed frequency signal；Step S4, mixed frequency signal is filtered to form intermediate-freuqncy signal；Step S5, intermediate-freuqncy signal is judged according to target detection threshold value, to determine whether the object of the first radiofrequency signal of reflection is moving target；If step S6, judging, the direction of motion of moving target is not that unanimously, which is invalid targets, if unanimously, which is effective target.The beneficial effect of technical solution of the present invention is: so that the influence of irregular disturbance reduces in external environment, improving sensitivity and reliability, and reduce cost.The invention also includes a kind of Radar Targets'Detection systems.
Description
Technical field
The present invention relates to Radar Technology field more particularly to a kind of radar target detection method and systems.
Background technique
Doppler radar moving target, and the speed of detectable moving target for identification, is widely used in intelligence
Household and internet of things field enrich the function of smart home and Internet of Things, and the requirement simultaneously for antenna performance is also more next
It is higher.In the prior art, Doppler radar emission system is received after reflection by radar by the radiofrequency signal of its transmitting
And mixing operation is carried out with the radiofrequency signal of transmitting, then handled by filter and amplification post-sampling, sentenced by threshold test
It is disconnected to whether there is moving target, the speed of moving target can be calculated according to Doppler frequency, but due to being easy by peripheral ring
The influence of border small items movement, so as to cause the moving target inaccuracy of detection.
However, the interference of this environment is inevitable in actual conditions.In general, in order to eliminate the interference of this environment, one
As by improve target detection threshold value or use finer filtering method.However, improving target detection threshold value will lead to inspection
Survey sensitivity decrease；And increase filtering can improve required calculating and storage resource, reduce the response time, in addition, the side of filtering
Method can not completely separate interference and the doppler information of target, may reduce the responding range of radar.Therefore, on
Problem is stated as those skilled in the art's urgent problem to be solved.
Summary of the invention
For the above-mentioned problems in the prior art, a kind of radar target for being intended to accurately detect moving target is now provided
Detection method and system.
Specific technical solution is as follows:
The present invention includes a kind of radar target detection method, wherein includes:
Step S1, one first radiofrequency signal is emitted by a transmission antenna group；
Step S2, one is received by a receiving antenna group to be believed by the second radio frequency that first radiofrequency signal reflects to form
Number；
Step S3, first radiofrequency signal and second radiofrequency signal are mixed and form a mixed frequency signal；
Step S4, the mixed frequency signal is filtered to form an intermediate-freuqncy signal；
Step S5, the intermediate-freuqncy signal is judged according to a target detection threshold value, to determine that reflection described first is penetrated
Whether the object of frequency signal is a moving target, is then exited if it does not exist；
Step S6, in judge in a predetermined period moving target the direction of motion it is whether consistent, if it is not, then judging institute
Stating moving target is invalid targets, and is exited, if so, judging the moving target for effective target.
Preferably, it in Yu Suoshu step S4, is filtered using a low-pass filter.
Preferably, it in Yu Suoshu step S5, after being sampled to the intermediate-freuqncy signal, is calculated by Fast Fourier Transform (FFT)
Method obtains the velocity information of the moving target.
Preferably, in Yu Suoshu step S6, the intermediate-freuqncy signal is decomposed into the road I intermediate-freuqncy signal and the road Q intermediate-freuqncy signal, and
Judge whether the direction of motion is consistent with the phase of the road Q intermediate-freuqncy signal by comparing the road I intermediate-freuqncy signal.
The present invention includes a kind of Radar Targets'Detection system, described using a kind of such as above-mentioned radar target detection method
Radar Targets'Detection system includes:
One transmitting module, for emitting one first radiofrequency signal；
One receiving module connects the transmitting module, for receive one reflected to form by first radiofrequency signal
Two radiofrequency signals；
One frequency mixing module is separately connected the transmitting module and the receiving module, is used for first radiofrequency signal
And second radiofrequency signal is mixed to form a mixed frequency signal；
One filter module connects the frequency mixing module, for being filtered to form an intermediate-freuqncy signal to the mixed frequency signal；
One first judgment module connects the filter module, is carried out according to a target detection threshold value to the intermediate-freuqncy signal
Judgement is reflected whether the object of first radiofrequency signal is a moving target to determine, is then exited if it does not exist；
One second judgment module, connects the first judgment module, for judging the movement mesh in a predetermined period
Whether the target direction of motion is consistent, if it is not, then judging that the moving target for invalid targets, and exits, if so, described in judgement
Moving target is effective target.
Preferably, the filter module includes:
One filter, for being filtered to the mixed frequency signal.
Preferably, the first judgment module includes:
One sampling unit, for being sampled to the intermediate-freuqncy signal；
One processing unit connects the sampling unit, for obtaining the movement mesh by fast fourier transform algorithm
Target velocity information.
Preferably, the second judgment unit includes:
One decomposition unit, for the intermediate-freuqncy signal to be decomposed into the road I intermediate-freuqncy signal and the road Q intermediate-freuqncy signal；
One comparison unit connects the decomposition unit, for by comparing the road I intermediate-freuqncy signal and the road Q intermediate frequency
The phase of signal judges whether the direction of motion is consistent.
The beneficial effect of technical solution of the present invention is: on the basis of existing Doppler radar object detection method
Increase to moving target in the judgement of movement velocity and the direction of motion in a predetermined period, to determine whether moving target is to have
Target is imitated, so that the influence of irregular disturbance reduces in external environment, improves sensitivity and reliability, and excessive without increasing
Storage, computing resource, reduce cost, are suitble to promote.
Detailed description of the invention
With reference to appended attached drawing, more fully to describe the embodiment of the present invention.However, appended attached drawing be merely to illustrate and
It illustrates, and is not meant to limit the scope of the invention.
Fig. 1 is the method and step figure of the embodiment of the present invention；
Fig. 2 is a kind of coordinate diagram of intermediate-freuqncy signal of the embodiment of the present invention；
Fig. 3 is the coordinate diagram of another intermediate-freuqncy signal of the embodiment of the present invention；
Fig. 4 is the system principle diagram of the embodiment of the present invention；
Fig. 5 is the second judgment module block diagram of the embodiment of the present invention；
Fig. 6 is the first judgment module block diagram of the embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art without creative labor it is obtained it is all its
His embodiment, shall fall within the protection scope of the present invention.
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.
The present invention will be further explained below with reference to the attached drawings and specific examples, but not as the limitation of the invention.
The present invention provides a kind of radar target detection method, wherein includes:
Step S1, one first radiofrequency signal is emitted by a transmission antenna group；
Step S2, second radiofrequency signal reflected to form by the first radiofrequency signal is received by a receiving antenna group；
Step S3, it is mixed the first radiofrequency signal and the second radiofrequency signal to form a mixed frequency signal；
Step S4, mixed frequency signal is filtered to form an intermediate-freuqncy signal；
Step S5, intermediate-freuqncy signal is judged according to a target detection threshold value, to determine the first radiofrequency signal of reflection
Whether object is a moving target, is then exited if it does not exist；
Step S6, in judge in a predetermined period moving target the direction of motion it is whether consistent, if it is not, then judge move mesh
Invalid targets are designated as, and are exited, if so, judging moving target for effective target.
In step S6, intermediate-freuqncy signal is decomposed into the road I intermediate-freuqncy signal and the road Q intermediate-freuqncy signal, and by comparing the road I intermediate frequency
Signal judges whether the direction of motion is consistent with the phase of the road Q intermediate-freuqncy signal.
By the radar target detection method of above-mentioned offer, as shown in Figure 1, emitting the first radio frequency letter by transmission antenna group
Number the second radiofrequency signal is reflected to form, and is received by receiving antenna group.
Further, the first above-mentioned radiofrequency signal and the second radiofrequency signal are subjected to mixing operation, to form mixing letter
Number, and pass through filter and amplification post-sampling, then processing is carried out to mixed frequency signal and forms intermediate-freuqncy signal.
Further, intermediate-freuqncy signal is judged according to one target detection threshold value of setting, to determine whether there is movement
Target.
So-called target detection threshold value is that a kind of reference of the signal and noise for distinguishing moving target is measured, with radar system
Bottom is made an uproar correlation, is influenced by radar system inherent parameters and ambient noise, in the present embodiment, is set in moving object detection environment
The target detection threshold value initial value set is 25, and user can be according to specific usage scenario and environment on-line tuning target detection threshold
Value, target detection threshold value, which gets over high detection sensitivity, to be declined, and rate of false alarm can also decline, and target detection threshold value setting it is too low when,
Rate of false alarm can rise.
Further, moving target, the then Doppler frequency for passing through calculating intermediate-freuqncy signal again obtain moving target if it exists
Movement velocity.(how to obtain the movement velocity of moving target is the prior art, and this will not be detailed here)
It further, is the road I intermediate-freuqncy signal and the road Q intermediate-freuqncy signal by above-mentioned intermediate frequency signal decomposition, and by comparing in the road I
Frequency signal judges whether the direction of motion is consistent with the phase of the road Q intermediate-freuqncy signal.
The road I intermediate-freuqncy signal is indicated by the first following formula:
BI(t)=A*cos (2 π * fd*t+θ0)；
The road Q intermediate-freuqncy signal is indicated by the first following formula:
Then by above-mentioned formula, the phase of the road Q intermediate-freuqncy signal is advanced, and instruction moving target is close, (as shown in Figure 2) its cross
Coordinate is time t (unit: S), and ordinate is the size B (unit: V) of intermediate-freuqncy signal.
If the road I intermediate-freuqncy signal is indicated by following second of formula:
BI(t)=A*cos (2 π * (- fd) * t+ θ0)=A*cos (2 π * fd*t-θ0)；
The road Q intermediate-freuqncy signal is indicated by following second of formula:
Then by above-mentioned formula, the phase of the road I intermediate-freuqncy signal is advanced, it is horizontal far from (as shown in Figure 3) for instruction moving target
Coordinate is time t (unit: S), and ordinate is the size B (unit: V) of intermediate-freuqncy signal.
Wherein, BIFor indicating the size of the road I intermediate-freuqncy signal；
BQFor indicating the size of the road Q intermediate-freuqncy signal；
A is used to indicate the amplitude of intermediate-freuqncy signal；
fdFor indicating the Doppler frequency of intermediate-freuqncy signal；
T is for indicating the time；
θ0For indicating the phase of the road I intermediate-freuqncy signal；
For indicating the phase of the road Q intermediate-freuqncy signal.
Further, if in some cycles, the phase of the road Q intermediate-freuqncy signal is always advanced, and indicates moving target always
Close, then the movement velocity direction of moving target is always the same direction, so that it may determine that the moving target is effective target, it is no
It is then invalid targets；Alternatively, if the phase of the road I intermediate-freuqncy signal is always advanced in some cycles, and instruction moving target is total
Be it is separate, then the movement velocity direction of moving target is always the same direction, so that it may determine the moving target be effective target,
It otherwise is invalid targets.
It in a kind of preferably embodiment, in step S4, is filtered using a low-pass filter, for believing mixing
Number it is filtered amplification, so that confirmation moving target is more accurate.
In a kind of preferably embodiment, in step S5, after sampling to intermediate-freuqncy signal, pass through fast Fourier
Convert the velocity information that algorithm obtains moving target.
The present invention also provides a kind of Radar Targets'Detection systems, using a kind of radar target detection method as described above
The Radar Targets'Detection system includes:
One transmitting module 1, for emitting one first radiofrequency signal；
One receiving module 2 connects transmitting module 1, for receiving second radio frequency reflected to form by the first radiofrequency signal
Signal；
One frequency mixing module 3, is separately connected transmitting module 1 and receiving module 2, is used for the first radiofrequency signal and the second radio frequency
Signal is mixed to form a mixed frequency signal；
One filter module 4 connects frequency mixing module 3, to form an intermediate-freuqncy signal for being filtered to mixed frequency signal；
One first judgment module 5 connects filter module 4, is judged according to a target detection threshold value intermediate-freuqncy signal, with
Whether the object for determining the first radiofrequency signal of reflection is a moving target, is then exited if it does not exist；
One second judgment module 6 connects first judgment module 5, for judging the fortune of moving target in a predetermined period
Whether dynamic direction is consistent, if it is not, then judging that moving target for invalid targets, and exits, if so, judging that moving target is effective
Target.
Second judgment module 6 includes:
One decomposition unit 60, for intermediate-freuqncy signal to be decomposed into the road I intermediate-freuqncy signal and the road Q intermediate-freuqncy signal；
One comparison unit 61 connects decomposition unit 60, for the phase by comparing the road I intermediate-freuqncy signal and the road Q intermediate-freuqncy signal
Position judges whether the direction of motion is consistent.
Specifically, in conjunction with shown in Fig. 4,5, the first radiofrequency signal is emitted by transmitting module 1 and is reflected to form the second radio frequency
Signal, and received by receiving module 2.
Further, the first above-mentioned radiofrequency signal and the second radiofrequency signal are carried out by mixing operation by frequency mixing module 3,
To form mixed frequency signal, and filter and amplification post-sampling is passed through by filter module 4, then processing is carried out to mixed frequency signal and forms intermediate frequency
Signal.
Further, intermediate-freuqncy signal is judged according to one target detection threshold value of setting, to determine whether there is movement
Target.
So-called target detection threshold value is that a kind of reference of the signal and noise for distinguishing moving target is measured, with radar system
Bottom is made an uproar correlation, is influenced by radar system inherent parameters and ambient noise, in the present embodiment, is set in moving object detection environment
The target detection threshold value initial value set is 25, and user can be according to specific usage scenario and environment on-line tuning target detection threshold
Value, target detection threshold value, which gets over high detection sensitivity, to be declined, and rate of false alarm can also decline, and target detection threshold value setting it is too low when,
Rate of false alarm can rise.
Further, moving target, the then Doppler frequency for passing through calculating intermediate-freuqncy signal again obtain moving target if it exists
Movement velocity.(how to obtain the movement velocity of moving target is the prior art, and this will not be detailed here)
Further, by decomposition unit 60 by above-mentioned intermediate frequency signal decomposition be the road I intermediate-freuqncy signal and the road Q intermediate-freuqncy signal,
And the road I intermediate-freuqncy signal is compared with the phase of the road Q intermediate-freuqncy signal to judge whether the direction of motion is consistent by comparison unit 60.
Further, further, above-mentioned intermediate-freuqncy signal is decomposed into the road I intermediate-freuqncy signal and the road Q by decomposition unit 60
Intermediate-freuqncy signal, and the phase of the road I intermediate-freuqncy signal and the road Q intermediate-freuqncy signal is compared to judge the direction of motion by comparison unit 61
It is whether consistent.
The road I intermediate-freuqncy signal is indicated by the first following formula:
BI(t)=A*cos (2 π * fd*t+θ0)；
The road Q intermediate-freuqncy signal is indicated by the first following formula:
Then by above-mentioned formula, the phase of the road Q intermediate-freuqncy signal is advanced, and instruction moving target is close, (as shown in Figure 2) its cross
Coordinate is time t (unit: S), and ordinate is the size B (unit: V) of intermediate-freuqncy signal.
If the road I intermediate-freuqncy signal is indicated by following second of formula:
BI(t)=A*cos (2 π * (- fd) * t+ θ0)=A*cos (2 π * fd*t-θ0)；
The road Q intermediate-freuqncy signal is indicated by following second of formula:
Then by above-mentioned formula, the phase of the road I intermediate-freuqncy signal is advanced, it is horizontal far from (as shown in Figure 3) for instruction moving target
Coordinate is time t (unit: S), and ordinate is the size B (unit: V) of intermediate-freuqncy signal.
Wherein, BIFor indicating the size of the road I intermediate-freuqncy signal；
BQFor indicating the size of the road Q intermediate-freuqncy signal；
A is used to indicate the amplitude of intermediate-freuqncy signal；
fdFor indicating the Doppler frequency of intermediate-freuqncy signal；
T is for indicating the time；
θ0For indicating the phase of the road I intermediate-freuqncy signal；
For indicating the phase of the road Q intermediate-freuqncy signal.
Further, if in some cycles, the phase of the road Q intermediate-freuqncy signal is always advanced, and indicates moving target always
Close, then the movement velocity direction of moving target is always the same direction, so that it may determine that the moving target is effective target, it is no
It is then invalid targets；Alternatively, if the phase of the road I intermediate-freuqncy signal is always advanced in some cycles, and instruction moving target is total
Be it is separate, then the movement velocity direction of moving target is always the same direction, so that it may determine the moving target be effective target,
It otherwise is invalid targets.
In a kind of preferably embodiment, filter module 4 includes:
One filter, for being filtered to mixed frequency signal.
In a kind of preferably embodiment, first judgment module 5 includes:
One sampling unit 50, for being sampled to intermediate-freuqncy signal；
One processing unit 51 connects sampling unit 50, for obtaining moving target by fast fourier transform algorithm
Velocity information.
Specifically, as shown in fig. 6, being adopted first by the sampling unit 50 in first judgment module 5 to intermediate-freuqncy signal
Sample, using processing unit 51 by using fast fourier transform algorithm, to obtain the velocity information of moving target.It is (same
Sample, how to obtain the movement velocity of moving target is the prior art, and this will not be detailed here)
The beneficial effect of technical solution of the present invention is: on the basis of existing Doppler radar object detection method
Increase to moving target in the judgement of movement velocity and the direction of motion in a predetermined period, to determine whether moving target is to have
Target is imitated, so that the influence of irregular disturbance reduces in external environment, improves sensitivity and reliability, and excessive without increasing
Storage, computing resource, reduce cost.
The foregoing is merely preferred embodiments of the present invention, are not intended to limit embodiments of the present invention and protection model
It encloses, to those skilled in the art, should can appreciate that all with made by description of the invention and diagramatic content
Equivalent replacement and obviously change obtained scheme, should all be included within the scope of the present invention.
Claims (8)
1. a kind of radar target detection method characterized by comprising
Step S1, one first radiofrequency signal is emitted by a transmission antenna group；
Step S2, second radiofrequency signal reflected to form by first radiofrequency signal is received by a receiving antenna group；
Step S3, first radiofrequency signal and second radiofrequency signal are mixed and form a mixed frequency signal；
Step S4, the mixed frequency signal is filtered to form an intermediate-freuqncy signal；
Step S5, the intermediate-freuqncy signal is judged according to a target detection threshold value, reflects the first radio frequency letter to determine
Number object whether be a moving target, then exit if it does not exist；
Step S6, in judge in a predetermined period moving target the direction of motion it is whether consistent, if it is not, then judging the fortune
Moving-target is invalid targets, and is exited, if so, judging the moving target for effective target.
2. a kind of radar target detection method according to claim 1, which is characterized in that in Yu Suoshu step S4, use
One low-pass filter is filtered.
3. a kind of radar target detection method according to claim 1, which is characterized in that in Yu Suoshu step S5, to institute
It states after intermediate-freuqncy signal sampled, the velocity information of the moving target is obtained by fast fourier transform algorithm.
4. a kind of radar target detection method according to claim 1, which is characterized in that in Yu Suoshu step S6, by institute
It states intermediate-freuqncy signal and is decomposed into the road I intermediate-freuqncy signal and the road Q intermediate-freuqncy signal, and by comparing in the road I intermediate-freuqncy signal and the road Q
The phase of frequency signal judges whether the direction of motion is consistent.
5. a kind of Radar Targets'Detection system, which is characterized in that using a kind of radar target as described in the claims 1-4
Detection method, the Radar Targets'Detection system include:
One transmitting module, for emitting one first radiofrequency signal；
One receiving module connects the transmitting module, second is penetrated for receiving one by first radiofrequency signal reflects to form
Frequency signal；
One frequency mixing module is separately connected the transmitting module and the receiving module, is used for first radiofrequency signal and institute
The second radiofrequency signal is stated to be mixed to form a mixed frequency signal；
One filter module connects the frequency mixing module, for being filtered to form an intermediate-freuqncy signal to the mixed frequency signal；
One first judgment module connects the filter module, is judged according to a target detection threshold value the intermediate-freuqncy signal,
It reflects whether the object of first radiofrequency signal is a moving target to determine, then exits if it does not exist；
One second judgment module, connects the first judgment module, for judging the moving target in a predetermined period
Whether the direction of motion is consistent, if it is not, then judging that the moving target for invalid targets, and exits, if so, judging the movement
Target is effective target.
6. a kind of Radar Targets'Detection system according to claim 5, which is characterized in that the filter module includes:
One filter, for being filtered to the mixed frequency signal.
7. a kind of Radar Targets'Detection system according to claim 5, which is characterized in that the first judgment module packet
It includes:
One sampling unit, for being sampled to the intermediate-freuqncy signal；
One processing unit connects the sampling unit, for obtaining the moving target by fast fourier transform algorithm
Velocity information.
8. a kind of radar target detection method according to claim 5, which is characterized in that the second judgment module packet
It includes:
One decomposition unit, for the intermediate-freuqncy signal to be decomposed into the road I intermediate-freuqncy signal and the road Q intermediate-freuqncy signal；
One comparison unit connects the decomposition unit, for by comparing the road I intermediate-freuqncy signal and the road Q intermediate-freuqncy signal
Phase judge whether the direction of motion consistent.
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| CN112363115A (en) * | 2020-10-27 | 2021-02-12 | 上海矽杰微电子有限公司 | Method for resisting influence of severe weather on radar sensor |
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