CN110501679A - A kind of radar signal real-time detection method - Google Patents
A kind of radar signal real-time detection method Download PDFInfo
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- CN110501679A CN110501679A CN201910759331.6A CN201910759331A CN110501679A CN 110501679 A CN110501679 A CN 110501679A CN 201910759331 A CN201910759331 A CN 201910759331A CN 110501679 A CN110501679 A CN 110501679A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/02—Measuring characteristics of individual pulses, e.g. deviation from pulse flatness, rise time or duration
- G01R29/027—Indicating that a pulse characteristic is either above or below a predetermined value or within or beyond a predetermined range of values
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/02—Measuring characteristics of individual pulses, e.g. deviation from pulse flatness, rise time or duration
- G01R29/027—Indicating that a pulse characteristic is either above or below a predetermined value or within or beyond a predetermined range of values
- G01R29/0273—Indicating that a pulse characteristic is either above or below a predetermined value or within or beyond a predetermined range of values the pulse characteristic being duration, i.e. width (indicating that frequency of pulses is above or below a certain limit)
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/02—Measuring characteristics of individual pulses, e.g. deviation from pulse flatness, rise time or duration
- G01R29/027—Indicating that a pulse characteristic is either above or below a predetermined value or within or beyond a predetermined range of values
- G01R29/0276—Indicating that a pulse characteristic is either above or below a predetermined value or within or beyond a predetermined range of values the pulse characteristic being rise time
-
- 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
- G01S7/285—Receivers
- G01S7/292—Extracting wanted echo-signals
- G01S7/2923—Extracting wanted echo-signals based on data belonging to a number of consecutive radar periods
- G01S7/2927—Extracting wanted echo-signals based on data belonging to a number of consecutive radar periods by deriving and controlling a threshold value
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The present invention relates to a kind of radar signal real-time detection methods, the average amplitude of N number of sampled point before a certain moment is compared by it with the amplitude of this instance sample point, if a certain moment start after several sampled points amplitude continuously compare before average amplitude in certain a period of time be higher by certain numerical value, then it is assumed that this moment, there are signal rising edges；, whereas if a certain moment starts have the average amplitude before the continuously Amplitude Ratio of several sampled points lower than certain numerical value later, then it is assumed that this moment, there are failing edges；In the presence of failing edge and rising edge are equal, signal section present in data can be cut out at once.The present invention whether there is by the judgment mode in the time domain to rising edge and failing edge to detect signal, can be achieved the effect that under the conditions of passive by the way that reasonable parameter and thresholding is arranged to signal real-time detection.
Description
Technical field
The present invention relates to Radar Technology fields, and in particular to a kind of radar signal real-time detection method.
Background technique
Traditional detections of radar first has to carry out process of pulse-compression to echo-signal, by echo-signal and reference signal into
Row convolution.In actual treatment, collected echo-signal and reference signal are usually made FFT (Fast Fourier by us
Transformation it) calculates, and two frequency-region signals is multiplied, remake IFFT (Inverse Fast Fourier
Transformation) operation obtains pulse pressure result.Signal s through deriving, after pulse pressure can be obtained0(t) are as follows:
As it can be seen that Signal for Pulse has peak value in the time domain, appearance can be detected by setting reference unit and protection location
Value whether there is the detection that echo-signal can be realized.But this CFAR detection is first is that need to carry out thing to the signal received
Post-processing, first receive whole signals, remake FFT processing, and the numerical value of signal any point after pulse pressure is not only and currently
Sampled point is related, also related to sampled point later, therefore can not accomplish the effect of real-time detection.Second is that needing that ginseng is known in advance
Signal is examined, can not be used under conditions of passive.
In view of this, the present inventor's deep design for problems existing for Radar Signal Detection, and then develop
The present invention.
Summary of the invention
It is an object of the invention to overcome the deficiencies in the prior art, propose a kind of radar signal real-time detection method, lead to
The presence or absence of rising edge and failing edge are crossed to realize the real-time detection of signal.
To achieve the above object, the technical solution adopted by the present invention is that:
A kind of radar signal real-time detection method comprising:
Step 1, DSP start the signal received in a certain frequency range of continuous acquisition radar, and setup parameter: edge front window is long
Nfront, the long N of edge rear windowbehind, proportionality coefficient k, sampling number thresholding ηNWith amplitude threshold ηA；
Step 2, for some sampled point in signal, calculate the N before this sampled pointfrontThe front window of a composition
Average amplitude AfrontIf the amplitude A of the sampled pointtNot than average amplitude AfrontIt is higher by ηAThat is:
At-Afront≤ηA (2)
Then think that the sampled point is not rising edge, and this point is moved into front window, repeats step 2；
If the Amplitude Ratio A of the sampled pointfrontIt is higher by ηAThat is:
At-Afront> ηA (3)
Then think that the sampled point may be rising edge, this sampled point is set as to the state to be selected of rising edge；
Step 3, after a certain sampled point enters the state to be selected of rising edge, front window remains stationary, and successively judges the sampling
The subsequent N of pointbehindWhether a sampled point compares AfrontIt is higher by ηA, and counted；If there is more than kNbehindA sampled point meets
(3), then it is assumed that the sampled point of rising edge state to be selected is signal rising edge, is declined to next sampled point of the rising edge
Judge along thresholding；Otherwise it is assumed that the sampled point of this rising edge state to be selected is not rising edge, by rising edge state to be selected
Sampled point moves into front window, repeats step 2；
Step 4, the judgement of failing edge thresholding: front window remains motionless, judges whether sampled point meets formula (3), if at
It is vertical, then it is assumed that the sampled point is still signal section, continues the judgement of next sampled point, repeats step 4；Otherwise it is assumed that this is adopted
Sampling point may be failing edge, this sampled point is set as to the state to be selected of failing edge；
Step 5, after a certain sampled point enters the state to be selected of failing edge, successively judge its subsequent NbehindA sampling
Whether point meets formula (2), if there is more than kNbehindA sampled point meets formula (2), then it is assumed that failing edge state to be selected is adopted
Sampling point is signal failing edge；Otherwise it is assumed that this failing edge sampled point to be selected is not failing edge, next sampled point is declined
Judge along thresholding, repeats step 4；
Step 6, when a certain sampled point is judged as failing edge, the alternate position spike of the position and rising edge that judge failing edge is
It is no to be greater than sampling number thresholding ηN, think that this section is signal section if setting up, all by rising edge to failing edge adopt
Sampling point all cuts and comes out, and is handled as signal section；Otherwise it is assumed that pulsewidth is narrow, this section of sampled point is abandoned, repeats step
2。
After adopting the above scheme, the invention has the following advantages:
The present invention respectively takes a narrow window before and after sampled point, counts the big Mr. Yu of sample amplitude in former and later two narrow windows respectively
The number of one threshold value is adjudicated, and the timeliness of judgement is on the one hand improved to the statistics of front window and rear window, on the other hand reduce in
Deposit consumption；Moreover, the present invention judges the presence or absence of signal and cuts roughly to signal section according to whether pulse width is greater than threshold value
It takes, this processing mode simplicity calculation amount is small, the real-time detection and interception suitable for signal.
The present invention is real-time judge and intercept signal part in order to which the signal to one section of sampled point detects, unrelated mesh
Any parameter information of target, therefore this algorithm is without specifying specific signal type, is directed to all signals, and rising edge and
Failing edge is judged in the time domain, without carrying out Fast Fourier Transform (FFT).
Detailed description of the invention
Fig. 1 is flow chart of the invention；
Fig. 2 is the Radar Signal Detection result schematic diagram of one embodiment of the invention.
Specific embodiment
As shown in Figure 1, present invention discloses a kind of radar signal real-time detection method, N number of before a certain moment is adopted
The average amplitude of sampling point is compared with the amplitude of this instance sample point, if a certain moment start after several sampling
Average amplitude before the amplitude of point continuously compares in certain a period of time is higher by certain numerical value, then it is assumed that this moment, there are on signal
Rise edge；, whereas if a certain moment starts have the average amplitude before the continuously Amplitude Ratio of several sampled points lower than one later
Fixed number value, then it is assumed that this moment, there are failing edges；In the presence of failing edge and rising edge are equal, it can cut out at once in data and deposit
Signal section.
Radar signal real-time detection method of the present invention is specific as follows:
Step 1, DSP (Digital Signal Processor, digital signal processor) start continuous acquisition radar
The signal received in one frequency range, and set relevant parameter: the long N of edge front windowfront, the long N of edge rear windowbehind, proportionality coefficient k,
Sampling number thresholding ηNWith amplitude threshold ηA.Default situations, parameter setting situation are as follows:
| Edge front window is long | 10 |
| Edge rear window is long | 50 |
| Proportionality coefficient | 0.8 |
| Sampling number thresholding | The 10% of most short pulse duration |
| Amplitude threshold | The 50% of signal amplitude estimation value |
Step 2, for some sampled point in signal, calculate the N before this sampled pointfrontThe front window of a composition
Average amplitude AfrontIf the amplitude A of the sampled pointtNot than average amplitude AfrontIt is higher by ηAThat is:
At-Afront≤ηA (2)
Then think that the sampled point is not rising edge, and this point is moved into front window, repeats step 2；
If the Amplitude Ratio A of the sampled pointfrontIt is higher by ηAThat is:
At-Afront> ηA (3)
Then think that the sampled point may be rising edge, this sampled point is set as to the state to be selected of rising edge.
Step 3, after a certain sampled point enters the state to be selected of rising edge, front window remains stationary, and successively judges the sampling
The subsequent N of pointbehindWhether a sampled point compares AfrontIt is higher by ηA, and counted.If the N of rear windowbehindA sampled point meets
The ratio of formula (3) is more than k, that is, has more than kNbehindA sampling number meets formula (3), then it is assumed that the sampled point of the state to be selected is
Signal rising edge carries out thresholding judgement to next sampled point of the rising edge sampled point；Otherwise it is assumed that this state to be selected is adopted
Sampling point is not rising edge, and the sampled point of the state to be selected is moved into front window, repeats step 2.
Step 4, the judgement of failing edge thresholding: front window remains motionless, judges whether sampled point meets formula (3), if at
It is vertical, then it is assumed that the sampled point is still signal section, continues the judgement of next sampled point, repeats step 4；Otherwise it is assumed that this is adopted
Sampling point may be failing edge, this sampled point is set as to the state to be selected of failing edge.
Step 5, after a certain sampled point enters the state to be selected of failing edge, successively judge its subsequent NbehindA sampling
Whether point meets formula (2), if there is more than kNbehindA sampled point is set up, then it is assumed that the sampled point of the state to be selected is under signal
Edge drops；Otherwise it is assumed that this sampled point to be selected is not failing edge, failing edge, which selects next sampled point of the sampled point of state, to be waited for this
The judgement of failing edge thresholding is carried out, step 4 is repeated.
Step 6, when a certain sampled point is judged as failing edge, the alternate position spike of the position and rising edge that judge failing edge is
It is no to be greater than sampling number thresholding ηN, think that this section is signal section if setting up, all by rising edge to failing edge adopt
Sampling point all cuts and comes out, and is handled as signal section；Otherwise it is assumed that pulsewidth is narrow, this section of sampled point is abandoned, repeats step
2。
It is of the invention it is critical that the present invention detects letter by the judgment mode in the time domain to rising edge and failing edge
It number whether there is, can be achieved the effect that under the conditions of passive by the way that reasonable parameter and thresholding is arranged to signal real-time detection.
The above is only the embodiment of the present invention, is not intended to limit the scope of the present invention, therefore all
Any subtle modifications, equivalent variations and modifications to the above embodiments according to the technical essence of the invention still fall within this
In the range of inventive technique scheme.
Claims (1)
1. a kind of radar signal real-time detection method, it is characterised in that: the described method includes:
Step 1, DSP start the signal received in a certain frequency range of continuous acquisition radar, and setup parameter: edge front window is long
Nfront, the long N of edge rear windowbehind, proportionality coefficient k, sampling number thresholding ηNWith amplitude threshold ηA；
Step 2, for some sampled point in signal, calculate the N before this sampled pointfrontThe front window of a composition is averaged
Amplitude AfrontIf the amplitude A of the sampled pointtNot than average amplitude AfrontIt is higher by ηAThat is:
At-Afront≤ηA (2)
Then think that the sampled point is not rising edge, and this point is moved into front window, repeats step 2；
If the Amplitude Ratio A of the sampled pointfrontIt is higher by ηAThat is:
At-Afront> ηA (3)
Then think that the sampled point may be rising edge, this sampled point is set as to the state to be selected of rising edge；
Step 3, after a certain sampled point enters the state to be selected of rising edge, front window remains stationary, after successively judging the sampled point
The N in facebehindWhether a sampled point compares AfrontIt is higher by ηA, and counted；If there is more than kNbehindA sampled point meets (3),
The sampled point for then thinking rising edge state to be selected is signal rising edge, carries out failing edge door to next sampled point of the rising edge
Limit judgement；Otherwise it is assumed that the sampled point of this rising edge state to be selected is not rising edge, by the sampling of rising edge state to be selected
Point moves into front window, repeats step 2；
Step 4, the judgement of failing edge thresholding: front window remains motionless, judges whether sampled point meets formula (3), if set up,
Think that the sampled point is still signal section, continue the judgement of next sampled point, repeats step 4；Otherwise it is assumed that this sampled point
It may be failing edge, this sampled point is set as to the state to be selected of failing edge；
Step 5, after a certain sampled point enters the state to be selected of failing edge, successively judge its subsequent NbehindA sampled point is
It is no to meet formula (2), if there is more than kNbehindA sampled point meets formula (2), then it is assumed that the sampled point of failing edge state to be selected
For signal failing edge；Otherwise it is assumed that this failing edge sampled point to be selected is not failing edge, failing edge door is carried out to next sampled point
Limit judgement, repeats step 4；
Step 6, when a certain sampled point is judged as failing edge, whether the alternate position spike of the position and rising edge that judge failing edge big
In sampling number thresholding ηN, think that this section is signal section if setting up, by all sampled points of rising edge to failing edge
It all cuts and comes out, handled as signal section；Otherwise it is assumed that pulsewidth is narrow, this section of sampled point is abandoned, repeats step 2.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111537962A (en) * | 2020-06-09 | 2020-08-14 | 厦门大学 | Rapid detection method for radar signals |
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