CN109490882A - Simultaneously for SAR imaging and the multiple-pulse combined method of moving object detection - Google Patents
Simultaneously for SAR imaging and the multiple-pulse combined method of moving object detection Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/89—Radar or analogous systems specially adapted for specific applications for mapping or imaging
- G01S13/90—Radar or analogous systems specially adapted for specific applications for mapping or imaging using synthetic aperture techniques, e.g. synthetic aperture radar [SAR] techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/89—Radar or analogous systems specially adapted for specific applications for mapping or imaging
- G01S13/90—Radar or analogous systems specially adapted for specific applications for mapping or imaging using synthetic aperture techniques, e.g. synthetic aperture radar [SAR] techniques
- G01S13/9021—SAR image post-processing techniques
- G01S13/9029—SAR image post-processing techniques specially adapted for moving target detection within a single SAR image or within multiple SAR images taken at the same time
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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
- G01S7/285—Receivers
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Abstract
The present invention provides a kind of simultaneously for SAR imaging and the multiple-pulse combined method of moving object detection, it include: that multiple-pulse is divided into multiple pulse groups, multiple pulse group constitutes the circulation transmitting of circulation group, and it is encoded, the width for the subpulse for including in each pulse group is equal, as window is received between two adjacent subpulses, the width of interface window is the integral multiple of subpulse width, and is less than width corresponding to the whole subpulses in each pulse group included；Based on reception window receives echo-signal；The starting decoded positions of circulation group are determined according to operating mode, and according to starting decoded positions, the grouping integer quotient matrix of received echo-signal are constructed, to restore echo signal.The present invention combines multiple-pulse, and circulation transmitting, every group of subpulse is encoded using phase weighting；When receiving decoding, signal recovery processing is carried out respectively, obtains being respectively adapted to the radar signal of SAR imaging and the radar signal of moving object detection.
Description
Technical field
This patent disclosure relates generally to Radar Technology fields, and in particular to a kind of simultaneously for SAR imaging and moving object detection
Multiple-pulse combined method.
Background technique
Radar is to pass through emission detection signal and receive the reflection signal of target to obtain a kind of radio of target information
Remote sensing equipment.In the prior art, the working system of radar mainly can be divided into two kinds of work sides of pulse and continuous wave
Formula.
Under pulsed mode, radar (also referred to as " pulse radar ") emit impulse form detectable signal, be followed by
The echo-signal of target is received, the transmitting and reception of pulse radar are successively separated in time；Under continuous wave working method,
Radar (also referred to as " continuous wave radar ") emits continuous wave detection signal, receives the echo-signal of target, continuous wave at the same time
The transmitting and reception of radar work at the same time.
Under pulsed mode, emission detection signal and reception target echo signal are time-sharing works, thus receive and dispatch it
Between influence each other smaller, the signal that radar can be bigger with transmission power, detection range can be distant.However, due to
Signal cannot be received when emitting signal, so there are the lower limit of detection range, that is, detection blind area, size is by transmitting signal
Pulse width determine.In many cases, due to the requirement of search coverage, pulse width is limited, it is desirable that increases direct impulse
Peak power, thus improve transmitting signal mean power, lead to transmitter apparatus more bulky complex.
Under continuous wave working method, due to continuous emission detection signal, so that the mean power of transmitting signal is larger, phase
For pulsed mode, the peak power of transmitting signal is much smaller, and can use solid-state devices, arrangement of components, real
Existing volume, the small light of weight.However, work due to emitting and receiving signal while carrying out, transmitting and receiving channel it
Between influence it is relatively large.It influences to guarantee that receiver can work normally to reduce, on the one hand requires to improve transceiver channel
On the other hand isolation will also have certain limitation to the transmitting signal power of transmitter.Under these conditions and limitation, cause
The performance of continuous wave radar is affected to some extent, and detection range is closer.
For the drawbacks described above or deficiency of pulse radar and continuous wave radar, continuous impulse thunder has been invented electron institute by the Chinese Academy of Sciences
Up to working system, the advantages of this new radar working system uses for reference pulse and continuous wave radar, based on transmitting and reception signal
The continuous emission detection pulse signal, while the time interval between transmitting pulse signal at certain intervals of mode separately
The echo-signal of target is received, the direct impulse signal of setting width is continuously emitted with transmission time interval, in the detection of transmitting
Pulse interval between pulse signal receives the part echo signal of target, then restores complete based on part echo signal and return
Wave signal.
In the invention, the complete echo-signal of recovery has specific pulse recurrence frequency, by pulse code and extensive
Double calculation method, adjustable pulse recurrence frequency.In multi-functional synthetic aperture radar (SAR), (SAR mode) is imaged for SAR,
The general pulse recurrence frequency for requiring to have suitable for operating distance, the imaging imaging parameters requirement such as breadth and signal ambiguity；For
Moving object detection mode (GMTI mode or MMTI), it is often desirable that pulse recurrence frequency is improved, to improve detection velocity interval,
Reduce blind speed range.When both mode time-sharing works, pulse recurrence frequency can be set separately, but worked as and needed both of which
When working at the same time, i.e. SAR/GMTI works at the same time mode, then needs to carry out compromise processing to repetition rate, in this way can be to two kinds
The performance of SAR imaging and moving object detection all generates limitation.
In continuous impulse radar system field, there are the need to the coding method for improving SAR/GMTI operating mode performance
It asks.
Summary of the invention
(1) technical problems to be solved
The purpose of the present invention is to provide a kind of simultaneously for SAR imaging and the multiple-pulse combination side of moving object detection
Method, when SAR/GMTI can be overcome to work at the same time mode, pulse recurrence frequency compromise is to two kinds of SAR imaging performances and movement mesh
Mark the limitation of detection performance.
(2) technical solution
According to an aspect of the present invention, a kind of while for SAR imaging and moving object detection multiple-pulse is provided to combine
Method, comprising:
The transmitting pulse of radar is divided into multiple pulse groups, the multiple group pulse constitutes circulation group and carries out circulation transmitting,
And each pulse group is encoded, the width for the subpulse for including in each pulse group is equal, between two adjacent subpulses
As window is received, the width of interface window is the integral multiple of subpulse width, and complete less than include in each pulse group
Width corresponding to portion's subpulse；
Based on the reception window receives echo-signal；
Determine the starting decoded positions of circulation group according to the operating mode of radar, and according to the starting decoded positions,
The grouping integer quotient matrix of received echo-signal is constructed, to restore echo signal；Wherein, the operating mode includes at least
SAR mode and moving object detection mode.
In a further embodiment, the step of starting decoded positions of circulation group are determined according to operating mode include:
In the case where operating mode is SAR mode, by a stator arteries and veins of a fixed pulse group in circulation group
Rush the starting decoded positions as circulation group；
In the case where operating mode is moving object detection mode, by a stator in the pulse group in circulation group
Starting decoded positions of the pulse as circulation group.
In a further embodiment, the fixation subpulse using in circulation group in pulse group rising as circulation group
The step of beginning decoded positions includes:
Using first subpulse in pulse group each in circulation group as the starting decoded positions of circulation group.
In a further embodiment, the fixation subpulse using in circulation group in pulse group rising as circulation group
The step of beginning decoded positions includes:
Using first subpulse in circulation group in interval pulse group as the starting decoded positions of circulation group；The interval
At least one pulse group is separated between pulse group.
In a further embodiment, described the step of encoding to each pulse group, includes:
Phase weighting is carried out to the subpulse in each pulse group；
According to the subpulse of phase weighting, each pulse group is encoded.
In a further embodiment, described that each pulse group is encoded according to the subpulse of phase weighting
Step includes:
It is encoded by 1, -1,0 pair of each pulse group；Wherein, it 1 indicates to emit the subpulse of 0 degree of phase weighting, -1 table
Show the subpulse of transmitting 180 degree phase weighting, 0 indicates to receive window.
In a further embodiment, include: based on the step of reception window receives echo-signal
Each reception window receives echo-signal in pulse group, the receives echo-signal have been superimposed multiple transmitting pulses
Echo-signal.
(3) beneficial effect
While embodiment according to the present invention at least for the multiple-pulse combined method of SAR imaging and moving object detection
It has the following beneficial effects:
When SAR/GMTI works at the same time mode, does not need to compromise to pulse recurrence frequency, be combined by multiple-pulse,
At least two pulse recurrence frequencies are provided, be respectively used to SAR imaging and moving object detection, so as to simultaneously meet SAR at
As the demand of performance and moving object detection performance.
Detailed description of the invention
Fig. 1 is the schematic diagram of the multiple-pulse combination of the embodiment of the present invention；
Fig. 2 is the schematic diagram of the echo-signal coding of the reception window of every group of multiple-pulse of the embodiment of the present invention；
Fig. 3 is that the signal of decoded starting decoded positions is imaged for SAR for the multiple-pulse combined method of the embodiment of the present invention
Figure；
Fig. 4 is the multiple-pulse combined method of the embodiment of the present invention for the decoded starting decoded positions of moving object detection
Schematic diagram；
Fig. 5 is the another kind of the multiple-pulse combined method of the embodiment of the present invention for the decoded starting solution of moving object detection
The schematic diagram of code position；
Fig. 6 be the embodiment of the present invention based on and meanwhile for SAR imaging and moving object detection multiple-pulse combined method
Process schematic diagram.
Specific embodiment
For the purpose of the present invention, method and advantage is more clearly understood, below in conjunction with specific embodiment, and referring to attached
Figure, the present invention is described in more detail.
According to one embodiment of present invention, provide it is a kind of based on and meanwhile for SAR imaging and moving object detection it is more
Pulse combined method, specifically includes that as shown in Figure 6
S1: the transmitting pulse of radar is divided into multiple pulse groups, multiple pulse group constitutes the circulation transmitting of circulation group；This is more
A pulse group constitutes circulation group and carries out circulation transmitting；And each pulse group is encoded, wherein include in each pulse group
The width of subpulse is equal, and as window is received between two adjacent subpulses, the width of interface window is subpulse width
Integral multiple, and be less than each pulse group in include whole subpulses corresponding to width；
S2: based on reception window receives echo-signal；
S3: determining the starting decoded positions of circulation group according to operating mode, and according to starting decoded positions, building is received
Echo-signal grouping integer quotient matrix, to restore echo signal；Wherein, operating mode includes at least SAR mode and fortune
Moving-target detection pattern.
It in step sl, is SAR mode in operating mode when determining the starting decoded positions of circulation group according to operating mode
In the case where, using one of a fixed pulse group in circulation group fixed subpulse as the starting decoded positions of circulation group；
Operating mode be moving object detection mode in the case where, using a fixed subpulse in the pulse group in circulation group as
The starting decoded positions of circulation group.
Wherein, using a fixed subpulse in the pulse group in circulation group as when the starting decoded positions of circulation group,
It can be using first subpulse in pulse group each in circulation group as the starting decoded positions of circulation group, as shown in Figure 4.Or
Person, using first subpulse in circulation group in interval pulse group as the starting decoded positions of circulation group；Interval pulse group it
Between between be separated with first subpulse conduct being spaced in one subpulse group at least one pulse group, such as a circulation group
The starting decoded positions of circulation group, as shown in Figure 5.
When encoding to each pulse group, phase weighting is carried out to the subpulse in each pulse group；According to phase plus
The subpulse of power encodes each pulse group.According to the subpulse of phase weighting, the mistake that each pulse group is encoded
Cheng Zhong is encoded by 1, -1,0 pair of each pulse group；Wherein, it 1 indicates to emit the subpulse of 0 degree of phase weighting, -1 indicates
Emit the subpulse of 180 degree phase weighting, 0 indicates to receive window.
And each reception window receives echo-signal in pulse group, receives echo-signal have been superimposed multiple transmitting arteries and veins
The echo-signal of punching.
The transmitting pulse of radar is divided into n pulse group, n pulse group arteries and veins when multiple-pulse combines by the embodiment of the present invention
Punching constitutes circulation group and carries out circulation transmitting, includes m subpulse in each pulse group, the width of subpulse is equal, using phase
The subpulse of weighting is encoded, and has the reception window of 1 to m-1 sub- pulse width between two subpulses.
When receiving decoding, for SAR imaging, by a stator arteries and veins of a fixed pulse group in circulation group
The starting decoded positions as circulation group are rushed, when signal restores, take the complete echo of each subpulse by k reception window
Composition, k=m+j-1, wherein j is the number for the pulse width that this group of multiple-pulse all receives window；Each group of multiple-pulse has j
Window is received, each echo for receiving window is formed by stacking by multiple exomonental echoes；Window is received by building
The grouping integer quotient matrix of echo, realizes the recovery of radar signal.
Fig. 1 is the schematic diagram of the multiple-pulse combination of the embodiment of the present invention, wherein n=7, m=5, k=11, j=7.Upwards
Pulse indicate the subpulse of 0 degree phase weighting of transmitting, downward pulse indicates to emit the subpulse of 180 degree phase weighting, nothing
Indicate to receive window there can be multiple continuous reception windows when pulse, each subpulse and reception window occupy identical
Time width.
The subpulse for indicating 0 degree of phase weighting of transmitting with 1, -1 indicates the subpulse of transmitting 180 degree phase weighting, and 0 indicates
Window is received, then each pulse group of Fig. 1 can indicate are as follows:
1st group of multiple-pulse (Group 1): 101010100100；
2nd group of multiple-pulse (Group 2): -101010100100；
3rd group of multiple-pulse (Group3): 10-1010100100；
4th group of multiple-pulse (Group 4): 1010-10100100；
5th group of multiple-pulse (Group 5): 101010-100100；
6th group of multiple-pulse (Group6): 101010100-100；
7th group of multiple-pulse (Group 7): 101010100100；
If the complete echo of each subpulse is made of 11 reception windows, be respectively as follows: Echo1, Echo2, Echo3,
Echo4、Echo5、Echo6、Echo7、Echo8、Echo9、Echo10、Echo11。
Fig. 2 is the schematic diagram of the echo-signal coding of the reception window of every group of multiple-pulse of the embodiment of the present invention, in this hair
In bright embodiment (corresponding diagram 1, n=7, m=5, k=11, j=7), a total of 7 receptions window of each group of multiple-pulse, each
The echo for receiving window is formed by stacking by multiple exomonental echoes.Defining G (m, n) is n-th of m group reception window
Echo-signal, wherein m=1,2,3,4,5,6,7；N=1,2,3,4,5,6,7.Use Echok(k=1,2,3 ... ..., 11) is indicated
G (m, n) obtains 49 following expression formulas:
Group1:
G (1,1)=Echo1+Echo4+Echo7+Echo9+Echo11；
G (1,2)=Echo1+Echo3+Echo6+Echo9+Echo11；
G (1,3)=Echo1+Echo3+Echo5+Echo8+Echo11；
G (Isosorbide-5-Nitrae)=Echo1+Echo3+Echo5+Echo7+Echo10；
G (1,5)=Echo2+Echo4+Echo6+Echo8+Echo11；
G (1,6)=Echo1+Echo4+Echo6+Echo8+Echo10；
G (1,7)=Echo2+Echo5+Echo7+Echo9+Echo11；
Group2:
G (2,1)=- Echo1+Echo4+Echo7+Echo9+Echo11；
G (2,2)=Echo1-Echo3+Echo6+Echo9+Echo11；
G (2,3)=Echo1+Echo3-Echo5+Echo8+Echo11；
G (2,4)=Echo1+Echo3+Echo5-Echo7+Echo10；
G (2,5)=Echo2+Echo4+Echo6-Echo8+Echo11；
G (2,6)=Echo1+Echo4+Echo6+Echo8-Echo10；
G (2,7)=Echo2+Echo5+Echo7+Echo9-Echo11；
Group3:
G (3,1)=Echo1+Echo4+Echo7+Echo9+Echo11；
G (3,2)=- Echo1+Echo3+Echo6+Echo9+Echo11；
G (3,3)=Echo1-Echo3+Echo5+Echo8+Echo11；
G (3,4)=Echo1+Echo3-Echo5+Echo7+Echo10；
G (3,5)=Echo2+Echo4-Echo6+Echo8+Echo11；
G (3,6)=Echo1+Echo4+Echo6-Echo8+Echo10；
G (3,7)=Echo2+Echo5+Echo7-Echo9+Echo11；
Group4:
G (4,1)=Echo1+Echo4+Echo7+Echo9-Echo11；
G (4,2)=Echo1+Echo3+Echo6+Echo9+Echo11；
G (4,3)=- Echo1+Echo3+Echo5+Echo8+Echo11；
G (4,4)=Echo1-Echo3+Echo5+Echo7+Echo10；
G (4,5)=Echo2-Echo4+Echo6+Echo8+Echo11；
G (4,6)=Echo1+Echo4-Echo6+Echo8+Echo10；
G (4,7)=Echo2+Echo5-Echo7+Echo9+Echo11；
Group5:
G (5,1)=Echo1+Echo4+Echo7-Echo9+Echo11；
G (5,2)=Echo1+Echo3+Echo6+Echo9-Echo11；
G (5,3)=Echo1+Echo3+Echo5+Echo8+Echo11；
G (5,4)=- Echo1+Echo3+Echo5+Echo7+Echo10；
G (5,5)=- Echo2+Echo4+Echo6+Echo8+Echo11；
G (5,6)=Echo1-Echo4+Echo6+Echo8+Echo10；
G (5,7)=Echo2-Echo5+Echo7+Echo9+Echo11；
Group6:
G (6,1)=Echo1+Echo4-Echo7+Echo9+Echo11；
G (6,2)=Echo1+Echo3+Echo6-Echo9+Echo11；
G (6,3)=Echo1+Echo3+Echo5+Echo8-Echo11；
G (6,4)=Echo1+Echo3+Echo5+Echo7+Echo10；
G (6,5)=Echo2+Echo4+Echo6+Echo8+Echo11；
G (6,6)=- Echo1+Echo4+Echo6+Echo8+Echo10；
G (6,7)=- Echo2+Echo5+Echo7+Echo9+Echo11；
Group7:
G (7,1)=Echo1-Echo4+Echo7+Echo9+Echo11；
G (7,2)=Echo1+Echo3-Echo6+Echo9+Echo11；
G (7,3)=Echo1+Echo3+Echo5-Echo8+Echo11；
G (7,4)=Echo1+Echo3+Echo5+Echo7-Echo10；
G (7,5)=Echo2+Echo4+Echo6+Echo8-Echo11；
G (7,6)=Echo1+Echo4+Echo6+Echo8+Echo10；
G (7,7)=Echo2+Echo5+Echo7+Echo9+Echo11；
Fig. 3 is that the signal of decoded starting decoded positions is imaged for SAR for the multiple-pulse combined method of the embodiment of the present invention
Figure.In embodiments of the present invention, correspond to Fig. 1, when receiving decoding, for SAR imaging, by the stator of fixed Combination
Pulse is decoded as the starting of a combination circulation, when signal restores, takes the complete echo of each subpulse by 11
A reception window composition, each group of multiple-pulse have 7 reception windows, each echo for receiving window is by multiple transmitting pulses
Echo be formed by stacking；Building receives the grouping integer quotient matrix of window echo, realizes the recovery of radar signal.
For Fig. 1 multiple-pulse combined method, in SAR imaging decoding, the code length pair of Group1~Group7
It answers the time of a pulse of traditional pulse SAR system long, for convenience, grouping integral coefficient matrix is written as polynomial form,
It is as follows that SAR imaging decoding restores solution process:
Echo1_R=G (1,1)+G (3,1)+G (4,1)+G (5,1)+G (6,1)+G (7,1) -4*G (2,1)
+ G (1,2)+G (2,2)+G (4,2)+G (5,2)+G (6,2)+G (7,2) -4*G (3,1)
+ G (1,3)+G (2,3)+G (3,3)+G (5,3)+G (6,3)+G (7,3) -4*G (4,3)
+ G (Isosorbide-5-Nitrae)+G (2,4)+G (3,4)+G (4,4)+G (6,4)+G (7,4) -4*G (5,4)
+ G (1,6)+G (2,6)+G (3,6)+G (4,6)+G (5,6)+G (7,6) -4*G (6,6)
=50*Echo1
Echo2_R=G (1,5)+G (2,5)+G (3,5)+G (4,5)+G (6,5)+G (7,5) -4*G (5,5)
+ G (1,7)+G (2,7)+G (3,7)+G (4,7)+G (5,7)+G (7,7) -4*G (6,7)
=20*Echo2
Echo3_R=G (1,2)+G (3,2)+G (4,2)+G (5,2)+G (6,2)+G (7,2) -4*G (2,2)
+ G (1,3)+G (2,3)+G (4,3)+G (5,3)+G (6,3)+G (7,3) -4*G (3,3)
+ G (Isosorbide-5-Nitrae)+G (2,4)+G (3,4)+G (5,4)+G (6,4)+G (7,4) -4*G (4,4)
=30*Echo3
Echo4_R=G (1,1)+G (2,1)+G (3,1)+G (4,1)+G (5,1)+G (6,1) -4*G (7,1)
+ G (1,5)+G (2,5)+G (3,5)+G (5,5)+G (6,5)+G (7,5) -4*G (4,5)
+ G (1,6)+G (2,6)+G (3,6)+G (4,6)+G (6,6)+G (7,6) -4*G (5,6)
=30*Echo4
Echo5_R=G (1,3)+G (3,3)+G (4,3)+G (5,3)+G (6,3)+G (7,3) -4*G (2,3)
+ G (Isosorbide-5-Nitrae)+G (2,4)+G (4,4)+G (5,4)+G (6,4)+G (7,4) -4*G (3,4)
+ G (1,7)+G (2,7)+G (3,7)+G (4,7)+G (6,7)+G (7,7) -4*G (5,7)
=30*Echo5
Echo6_R=G (1,2)+G (2,2)+G (3,2)+G (4,2)+G (5,2)+G (6,2) -4*G (7,2)
+ G (1,5)+G (2,5)+G (4,5)+G (5,5)+G (6,5)+G (7,5) -4*G (3,5)
+ G (1,6)+G (2,6)+G (3,6)+G (5,6)+G (6,6)+G (7,6) -4*G (4,6)
=30*Echo6
Echo7_R=G (1,1)+G (2,1)+G (3,1)+G (4,1)+G (5,1)+G (7,1) -4*G (6,1)
+ G (1,5)+G (2,5)+G (4,5)+G (5,5)+G (6,5)+G (7,5) -4*G (3,5)
+ G (1,7)+G (2,7)+G (3,7)+G (5,7)+G (6,7)+G (7,7) -4*G (4,7)
=30*Echo7
Echo8_R=G (1,3)+G (2,3)+G (3,3)+G (4,3)+G (5,3)+G (6,3) -4*G (7,3)
+ G (1,5)+G (3,5)+G (4,5)+G (5,5)+G (6,5)+G (7,5) -4*G (2,5)
+ G (1,6)+G (2,6)+G (4,6)+G (5,6)+G (6,6)+G (7,6) -4*G (3,6)
=30*Echo8
Echo9_R=G (1,1)+G (2,1)+G (3,1)+G (4,1)+G (6,1)+G (7,1) -4*G (5,1)
+ G (1,2)+G (2,2)+G (3,2)+G (4,2)+G (5,2)+G (7,2) -4*G (6,2)
+ G (1,7)+G (2,7)+G (4,7)+G (5,7)+G (6,7)+G (7,7) -4*G (3,7)
=30*Echo9
Echo10_R=G (Isosorbide-5-Nitrae)+G (2,4)+G (3,4)+G (4,4)+G (5,4)+G (6,4) -4*G (7,4)
+ G (1,6)+G (3,6)+G (4,6)+G (5,6)+G (6,6)+G (7,6) -4*G (2,6)
=20*Echo10
Echo11_R=G (1,1)+G (2,1)+G (3,1)+G (5,1)+G (6,1)+G (7,1) -4*G (4,1)
+ G (1,2)+G (2,2)+G (3,2)+G (4,2)+G (6,2)+G (7,2) -4*G (5,2)
+ G (1,3)+G (2,3)+G (3,3)+G (4,3)+G (5,3)+G (7,3) -4*G (6,3)
+ G (1,5)+G (2,5)+G (3,5)+G (4,5)+G (5,5)+G (6,5) -4*G (7,5)
+ G (1,7)+G (3,7)+G (4,7)+G (5,7)+G (6,7)+G (7,7) -4*G (2,7)
=50*Echo11
Wherein, Echok_ R is EchokRecovery signal (k=1,2,3 ... ..., 11).
Normalized recovery signal EchokThe result of _ RN (k=1,2,3 ... ..., 11) are as follows:
Echo1_RN=Echo1
Echo2_RN=Echo2
Echo3_RN=Echo3
Echo4_RN=Echo4
Echo5_RN=Echo5
Echo6_RN=Echo6
Echo7RN=Echo7
Echo8_RN=Echo8
Echo9_RN=Echo9
Echo10_RN=Echo10
Echo11_RN=Echo11
Recover target echo signal Echok_ RN (k=1,2,3 ... ..., 11), is equivalent to the pulse of traditional pulse SAR
Repetition time is the time of Group1~Group7 code length, in this manner it is possible to as traditional pulse SAR, according to need
Carry out subsequent imaging.
Fig. 4 is the multiple-pulse combined method of the embodiment of the present invention for the decoded starting decoded positions of moving object detection
Schematic diagram corresponds to Fig. 1.
When receiving decoding, for moving object detection processing, by a stator arteries and veins in the pulse group in circulation group
It rushes and is decoded as the starting decoded positions of circulation group, when signal restores, take the complete echo of each subpulse by 11
A reception window composition, each group of multiple-pulse have 7 reception windows, each echo for receiving window is by multiple transmitting pulses
Echo be formed by stacking；Building receives the grouping integer quotient matrix of window echo, realizes the recovery of radar signal.
For Fig. 1 multiple-pulse combined method, when moving object detection processing decodes, each group of Group1~Group7
The time of (or Group) code length corresponds to the time span of a pulse of traditional pulse system, in this way, moving target is examined
It surveys and handles n times that decoded pulse recurrence frequency is equivalent to SAR imaging decoding process, the n=7 in Fig. 1 coding method.
The solution process that moving object detection processing decoding restores is as follows:
(1) target echo signal of the pulse of the 1st equivalent traditional pulse radar is recovered:
The 1st group (Group1) of first subpulse recycled using the 1st originates bits of coded, use and SAR as first
The identical method of imaging decoding process is decoded recovery processing, and the complete of the 2nd equivalent traditional pulse after being restored returns
Wave number evidence；
The 2nd group (Group2) of first subpulse recycled using the 1st originates bits of coded, use and SAR as first
The identical method of imaging decoding process is decoded recovery processing, and the complete of the 2nd equivalent traditional pulse after being restored returns
Wave number evidence；
The 3rd group (Group3) of first subpulse recycled using the 1st originates bits of coded, use and SAR as first
The identical method of imaging decoding process is decoded recovery processing, and the complete of the 3rd equivalent traditional pulse after being restored returns
Wave number evidence；
The 4th group (Group4) of first subpulse recycled using the 1st originates bits of coded, use and SAR as first
The identical method of imaging decoding process is decoded recovery processing, and the complete of the 4th equivalent traditional pulse after being restored returns
Wave number evidence；
The 5th group (Group5) of first subpulse recycled using the 1st originates bits of coded, use and SAR as first
The identical method of imaging decoding process is decoded recovery processing, and the complete of the 5th equivalent traditional pulse after being restored returns
Wave number evidence；
The 6th group (Group6) of first subpulse recycled using the 1st originates bits of coded, use and SAR as first
The identical method of imaging decoding process is decoded recovery processing, and the complete of the 6th equivalent traditional pulse after being restored returns
Wave number evidence；
The 7th group (Group7) of first subpulse recycled using the 1st originates bits of coded, use and SAR as first
The identical method of imaging decoding process is decoded recovery processing, and the complete of the 7th equivalent traditional pulse after being restored returns
Wave number evidence；
It is decoded recovery, the target echo signal of the pulse of the 1st equivalent traditional pulse radar is recovered, is equivalent to biography
The pulse-recurrence time of system pulse radar pulse is the scramble time length of a combination (Group).
(2) target echo signal of the pulse of the 2nd equivalent traditional pulse radar is recovered:
The 2nd group (Group2) of first subpulse recycled using the 1st originates bits of coded, use and SAR as first
The identical method of imaging decoding process is decoded recovery processing, and the complete of the 1st equivalent traditional pulse after being restored returns
Wave number evidence；
The 3rd group (Group3) of first subpulse recycled using the 1st originates bits of coded, use and SAR as first
The identical method of imaging decoding process is decoded recovery processing, and the complete of the 2nd equivalent traditional pulse after being restored returns
Wave number evidence；
The 4th group (Group4) of first subpulse recycled using the 1st originates bits of coded, use and SAR as first
The identical method of imaging decoding process is decoded recovery processing, and the complete of the 3rd equivalent traditional pulse after being restored returns
Wave number evidence；
The 5th group (Group5) of first subpulse recycled using the 1st originates bits of coded, use and SAR as first
The identical method of imaging decoding process is decoded recovery processing, and the complete of the 4th equivalent traditional pulse after being restored returns
Wave number evidence；
The 6th group (Group6) of first subpulse recycled using the 1st originates bits of coded, use and SAR as first
The identical method of imaging decoding process is decoded recovery processing, and the complete of the 5th equivalent traditional pulse after being restored returns
Wave number evidence；
The 7th group (Group7) of first subpulse recycled using the 1st originates bits of coded, use and SAR as first
The identical method of imaging decoding process is decoded recovery processing, and the complete of the 6th equivalent traditional pulse after being restored returns
Wave number evidence；
The 1st group (Group1) of first subpulse recycled using the 2nd originates bits of coded, use and SAR as first
The identical method of imaging decoding process is decoded recovery processing, and the complete of the 7th equivalent traditional pulse after being restored returns
Wave number evidence；
The 2nd group (Group2) of first subpulse recycled using the 2nd originates bits of coded, use and SAR as first
The identical method of imaging decoding process is decoded recovery processing, and the complete of the 9th equivalent traditional pulse after being restored returns
Wave number evidence；
It is decoded recovery, the target echo signal of the pulse of the 2nd equivalent traditional pulse radar is recovered, is equivalent to biography
The pulse-recurrence time of system pulse radar pulse is the scramble time length of a combination (Group).
(3) target echo signal of the pulse of the 3rd equivalent traditional pulse radar is recovered:
The 3rd group (Group3) of first subpulse recycled using the 1st originates bits of coded, use and SAR as first
The identical method of imaging decoding process is decoded recovery processing, and the complete of the 1st equivalent traditional pulse after being restored returns
Wave number evidence；
The 4th group (Group4) of first subpulse recycled using the 1st originates bits of coded, use and SAR as first
The identical method of imaging decoding process is decoded recovery processing, and the complete of the 2nd equivalent traditional pulse after being restored returns
Wave number evidence；
The 5th group (Group5) of first subpulse recycled using the 1st originates bits of coded, use and SAR as first
The identical method of imaging decoding process is decoded recovery processing, and the complete of the 3rd equivalent traditional pulse after being restored returns
Wave number evidence；
The 6th group (Group6) of first subpulse recycled using the 1st originates bits of coded, use and SAR as first
The identical method of imaging decoding process is decoded recovery processing, and the complete of the 4th equivalent traditional pulse after being restored returns
Wave number evidence；
The 7th group (Group7) of first subpulse recycled using the 1st originates bits of coded, use and SAR as first
The identical method of imaging decoding process is decoded recovery processing, and the complete of the 5th equivalent traditional pulse after being restored returns
Wave number evidence；
The 1st group (Group1) of first subpulse recycled using the 2nd originates bits of coded, use and SAR as first
The identical method of imaging decoding process is decoded recovery processing, and the complete of the 6th equivalent traditional pulse after being restored returns
Wave number evidence；
The 2nd group (Group2) of first subpulse recycled using the 2nd originates bits of coded, use and SAR as first
The identical method of imaging decoding process is decoded recovery processing, and the complete of the 7th equivalent traditional pulse after being restored returns
Wave number evidence；
It is decoded recovery, the target echo signal of the pulse of the 3rd equivalent traditional pulse radar is recovered, is equivalent to biography
The pulse-recurrence time of system pulse radar pulse is the scramble time length of a combination (Group).
Analogize by this method, recover the 4th, the 5th ..., n-th ... the pulse of equivalent traditional pulse radar
Target echo signal, pulse-recurrence time of each equivalent traditional pulse radar pulse is the coding of a combination (Group)
Time span.Its equivalent pulse reads 7 times that frequency is aforementioned SAR imaging decoding afterpulse repetition rate again, can be such as tradition
Pulse radar is the same, carries out subsequent moving object detection processing as needed.
Fig. 5 is the another kind of the multiple-pulse combined method of the embodiment of the present invention for the decoded starting solution of moving object detection
The schematic diagram of code position corresponds to Fig. 1.
It, in embodiments of the present invention, will be every the first of one group for moving object detection processing when receiving decoding
Subpulse as one combination circulation starting be decoded, signal restore when, take the complete echo of each subpulse by
11 reception window compositions, each group of multiple-pulse have 7 reception windows, each echo for receiving window is by multiple transmitting arteries and veins
The echo of punching is formed by stacking；Building receives the grouping integer quotient matrix of window echo, realizes the recovery of radar signal.
For Fig. 1 multiple-pulse combined method, when moving object detection processing decodes, each group of Group1~Group7
Twice of time span of (or Group) code length corresponds to the time span of a pulse of traditional pulse system, in this way, fortune
The decoded pulse recurrence frequency of moving-target detection processing is equivalent to n/2 times of SAR imaging decoding process, in Fig. 1 coding method
Middle n/2=3.5.
The solution process that this moving object detection processing decoding restores is as follows:
(1) target echo signal of the pulse of the 1st equivalent traditional pulse radar is recovered:
The 1st group (Group1) of first subpulse recycled using the 1st originates bits of coded, use and SAR as first
The identical method of imaging decoding process is decoded recovery processing, and the complete of the 2nd equivalent traditional pulse after being restored returns
Wave number evidence:；
The 2nd group (Group2) of first subpulse recycled using the 1st originates bits of coded, use and SAR as first
The identical method of imaging decoding process is decoded recovery processing, and the complete of the 2nd equivalent traditional pulse after being restored returns
Wave number evidence；
The 3rd group (Group3) of first subpulse recycled using the 1st originates bits of coded, use and SAR as first
The identical method of imaging decoding process is decoded recovery processing, and the complete of the 3rd equivalent traditional pulse after being restored returns
Wave number evidence；
The 4th group (Group4) of first subpulse recycled using the 1st originates bits of coded, use and SAR as first
The identical method of imaging decoding process is decoded recovery processing, and the complete of the 4th equivalent traditional pulse after being restored returns
Wave number evidence；
The 5th group (Group5) of first subpulse recycled using the 1st originates bits of coded, use and SAR as first
The identical method of imaging decoding process is decoded recovery processing, and the complete of the 5th equivalent traditional pulse after being restored returns
Wave number evidence；
The 6th group (Group6) of first subpulse recycled using the 1st originates bits of coded, use and SAR as first
The identical method of imaging decoding process is decoded recovery processing, and the complete of the 6th equivalent traditional pulse after being restored returns
Wave number evidence；
The 7th group (Group7) of first subpulse recycled using the 1st originates bits of coded, use and SAR as first
The identical method of imaging decoding process is decoded recovery processing, and the complete of the 7th equivalent traditional pulse after being restored returns
Wave number evidence；
It is decoded recovery, recovers the target echo signal of the pulse of the 1st equivalent traditional pulse radar.
(2) target echo signal of the pulse of the 2nd equivalent traditional pulse radar is recovered:
The 3rd group (Group3) of first subpulse recycled using the 1st originates bits of coded, use and SAR as first
The identical method of imaging decoding process is decoded recovery processing, and the complete of the 1st equivalent traditional pulse after being restored returns
Wave number evidence；
The 4th group (Group4) of first subpulse recycled using the 1st originates bits of coded, use and SAR as first
The identical method of imaging decoding process is decoded recovery processing, and the complete of the 2nd equivalent traditional pulse after being restored returns
Wave number evidence；
The 5th group (Group5) of first subpulse recycled using the 1st originates bits of coded, use and SAR as first
The identical method of imaging decoding process is decoded recovery processing, and the complete of the 3rd equivalent traditional pulse after being restored returns
Wave number evidence；
The 6th group (Group6) of first subpulse recycled using the 1st originates bits of coded, use and SAR as first
The identical method of imaging decoding process is decoded recovery processing, and the complete of the 4th equivalent traditional pulse after being restored returns
Wave number evidence；
The 7th group (Group7) of first subpulse recycled using the 1st originates bits of coded, use and SAR as first
The identical method of imaging decoding process is decoded recovery processing, and the complete of the 5th equivalent traditional pulse after being restored returns
Wave number evidence；
The 1st group (Group1) of first subpulse recycled using the 2nd originates bits of coded, use and SAR as first
The identical method of imaging decoding process is decoded recovery processing, and the complete of the 6th equivalent traditional pulse after being restored returns
Wave number evidence；
The 2nd group (Group2) of first subpulse recycled using the 2nd originates bits of coded, use and SAR as first
The identical method of imaging decoding process is decoded recovery processing, and the complete of the 7th equivalent traditional pulse after being restored returns
Wave number evidence；
It is decoded recovery, recovers the target echo signal of the pulse of the 2nd equivalent traditional pulse radar.
(3) target echo signal of the pulse of the 3rd equivalent traditional pulse radar is recovered:
The 5th group (Group5) of first subpulse recycled using the 1st originates bits of coded, use and SAR as first
The identical method of imaging decoding process is decoded recovery processing, and the complete of the 1st equivalent traditional pulse after being restored returns
Wave number evidence；
The 6th group (Group6) of first subpulse recycled using the 1st originates bits of coded, use and SAR as first
The identical method of imaging decoding process is decoded recovery processing, and the complete of the 2nd equivalent traditional pulse after being restored returns
Wave number evidence；
The 7th group (Group7) of first subpulse recycled using the 1st originates bits of coded, use and SAR as first
The identical method of imaging decoding process is decoded recovery processing, and the complete of the 3rd equivalent traditional pulse after being restored returns
Wave number evidence；
The 1st group (Group1) of first subpulse recycled using the 2nd originates bits of coded, use and SAR as first
The identical method of imaging decoding process is decoded recovery processing, and the complete of the 4th equivalent traditional pulse after being restored returns
Wave number evidence；
The 2nd group (Group2) of first subpulse recycled using the 2nd originates bits of coded, use and SAR as first
The identical method of imaging decoding process is decoded recovery processing, and the complete of the 5th equivalent traditional pulse after being restored returns
Wave number evidence；
The 3rd group (Group3) of first subpulse recycled using the 2nd originates bits of coded, use and SAR as first
The identical method of imaging decoding process is decoded recovery processing, and the complete of the 6th equivalent traditional pulse after being restored returns
Wave number evidence；
The 4th group (Group4) of first subpulse recycled using the 2nd originates bits of coded, use and SAR as first
The identical method of imaging decoding process is decoded recovery processing, and the complete of the 7th equivalent traditional pulse after being restored returns
Wave number evidence；
It is decoded recovery, recovers the target echo signal of the pulse of the 3rd equivalent traditional pulse radar.
Analogize by this method, recover the 4th, the 5th ..., n-th ... the pulse of equivalent traditional pulse radar
Target echo signal, when pulse-recurrence time of each equivalent traditional pulse radar pulse is the coding of 2 combinations (Group)
Between length.Its equivalent pulse reads 3.5 times that frequency is aforementioned SAR imaging decoding afterpulse repetition rate again, can be such as tradition
Pulse radar is the same, carries out subsequent moving object detection processing as needed.
It should be understood that the coding method and decoding of n=7, m=5, k=11, i=7 of embodiment according to the present invention restore
Method, the coding method that can also have the other parameters of existing method and coding/decoding method are for SAR imaging simultaneously and movement mesh
Mark detection decoding restores, and only illustrates 2 when moving object detection is restored and combines the scramble time length and 2 groups of (Group)
The scramble time length for closing (Group), can similarly be extrapolated to 3,4,5 etc..Above description be only schematically without
It is restrictive.
Specification of the invention be provided be in order to illustrate and description, rather than be used to exhaustion or to limit the invention to institute public
The form opened.For those of ordinary skill in the art, many modifications and changes are all possible.
Embodiment described above has carried out further specifically the purpose of the present invention, technical scheme and beneficial effects
It is bright, it should be understood that the above is only a specific embodiment of the present invention, it is not intended to restrict the invention, it is all at this
Within the spirit and principle of invention, any modification, equivalent substitution, improvement and etc. done should be included in protection model of the invention
Within enclosing.
Claims (7)
1. a kind of simultaneously for SAR imaging and the multiple-pulse combined method of moving object detection, comprising:
The transmitting pulse of radar is divided into multiple pulse groups, the multiple group pulse constitutes circulation group and carries out circulation transmitting, and right
Each pulse group is encoded, and the width for the subpulse for including in each pulse group is equal, conduct between two adjacent subpulses
Window is received, the width of interface window is the integral multiple of subpulse width, and is less than the sub- arteries and veins of whole in each pulse group included
The corresponding width of punching；
Based on the reception window receives echo-signal；
The starting decoded positions of circulation group are determined according to the operating mode of radar, and according to the starting decoded positions, building
The grouping integer quotient matrix of received echo-signal, to restore echo signal；Wherein, the operating mode includes at least SAR
Mode and moving object detection mode.
2. multiple-pulse combined method that is according to claim 1 while being used for SAR imaging and moving object detection, feature
The step of being, the starting decoded positions of circulation group are determined according to operating mode include:
In the case where operating mode is SAR mode, one of a fixed pulse group in circulation group fixed subpulse is made
For the starting decoded positions of circulation group；
In the case where operating mode is moving object detection mode, by a fixed subpulse in the pulse group in circulation group
Starting decoded positions as circulation group.
3. multiple-pulse combined method that is according to claim 2 while being used for SAR imaging and moving object detection, feature
It is, the fixation subpulse using in circulation group in pulse group includes: as the step of starting decoded positions of circulation group
Using first subpulse in pulse group each in circulation group as the starting decoded positions of circulation group.
4. multiple-pulse combined method that is according to claim 2 while being used for SAR imaging and moving object detection, feature
It is, the fixation subpulse using in circulation group in pulse group includes: as the step of starting decoded positions of circulation group
Using first subpulse in circulation group in interval pulse group as the starting decoded positions of circulation group；The interval pulse
At least one pulse group is separated between group.
5. multiple-pulse combined method that is according to claim 1 while being used for SAR imaging and moving object detection, feature
It is, described the step of encoding to each pulse group includes:
Phase weighting is carried out to the subpulse in each pulse group；
According to the subpulse of phase weighting, each pulse group is encoded.
6. multiple-pulse combined method that is according to claim 5 while being used for SAR imaging and moving object detection, feature
It is, according to the subpulse of phase weighting, described the step of encoding to each pulse group includes:
It is encoded by 1, -1,0 pair of each pulse group；Wherein, it 1 indicates to emit the subpulse of 0 degree of phase weighting, -1 indicates hair
The subpulse of 180 degree phase weighting is penetrated, 0 indicates to receive window.
7. multiple-pulse combined method that is according to claim 1 while being used for SAR imaging and moving object detection, feature
It is, includes: based on the step of reception window receives echo-signal
Each reception window receives echo-signal in pulse group, the receives echo-signal have been superimposed multiple exomonental times
Wave signal.
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