CN106646390B - A kind of PN sequence target acquisition processing method based on multicarrier DTMB signal - Google Patents
A kind of PN sequence target acquisition processing method based on multicarrier DTMB signal Download PDFInfo
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- CN106646390B CN106646390B CN201611241561.6A CN201611241561A CN106646390B CN 106646390 B CN106646390 B CN 106646390B CN 201611241561 A CN201611241561 A CN 201611241561A CN 106646390 B CN106646390 B CN 106646390B
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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
- G01S7/023—Interference mitigation, e.g. reducing or avoiding non-intentional interference with other HF-transmitters, base station transmitters for mobile communication or other radar systems, e.g. using electro-magnetic interference [EMI] reduction 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
- 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
- G01S7/41—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00 using analysis of echo signal for target characterisation; Target signature; Target cross-section
- G01S7/414—Discriminating targets with respect to background clutter
Abstract
The PN sequence target acquisition processing method based on multicarrier DTMB signal that the invention discloses a kind of, include: Step 1: carrying out PN pattern-recognition and synchronous operation using locally known PN sequence to the DTMB signal that radar receives, extracting PN sequence and compensating for frequency offset in DTMB signal；Step 2: carrying out multipath clutter AF panel to the PN sequence that step 1 is handled using locally known PN sequence；Step 3: carrying out coherent accumulation, i.e. coherent superposition, matched filtering to step 2 treated PN sequence, the processing such as subsequent object detecting and tracking is then carried out again.The present invention carries out target acquisition using known PN sequence signal, so that external illuminators-based radar receives system and is not required to additional reference channel, the PN sequence signal characteristic optimization algorithm of clutter recognition and coherent accumulation is also used simultaneously, reduce calculation amount, improve target acquisition performance, and be easier to realize in engineering, measured result demonstrates the feasibility using the signal detection target.
Description
Technical field
The invention belongs to technical field of radar communication, more particularly to a kind of multicarrier DTMB signal PN sequence target that is based on to visit
Survey processing method.
Background technique
Nearly ten years, China's digital broadcast television rapidly develops, especially DTMB (Digital Television
Terrestrial Multimedia Broadcasting) covering is domestic large, medium and small substantially for digital television ground broadcast signal
City.DTMB standard was proposed in 2006, including single carrier and multicarrier both of which.Wherein, multi-carrier mode uses orthogonal
Frequency multiplexing technique modulates frame, and this technology is compared with traditional frequency division multiplexing, improves the availability of frequency spectrum, while having out
The ability to anti-multipath of color.The mode uses PN sequence and its cyclic prefix and cyclic suffix as frame head serve as protection between
Every, while used also as synchronous and channel estimation.
The frame head of the DTMB signal frame of multi-carrier mode has PN945 mode and PN420 mode, using BPSK modulation and signal
Mean power is 2 times of frame average power signal.PN945 mode is constituted by synchronizing after a PN511 sequence and preamble,
PN511 sequence length is 511, is generated by 9 rank LFSR, and preamble is that rear 217 data of PN511 sequence are constituted, after synchronize and be
Preceding 217 data of PN511 sequence are constituted, and the frame head constituted in this way has cycle characteristics, as shown in Fig. 2-2 and Fig. 2-3.
PN420 mode and PN945 mode are roughly the same, only use PN255 sequence and front and back is synchronous.The 8 rank LFSR that PN255 is used
Generate, preamble be PN255 sequence rear 82 data constitute, then synchronize be PN255 sequence preceding 83 data constitute,
Such as Fig. 5-1 and Fig. 5-2.(refer to chinese national standard GB20600-2006, digital television ground broadcast transmission system frame structure,
Channel Coding and Modulation, China Standards Press, 2006).
Low target monitoring in urban environment is a difficult point in radar detection field, especially in recent years, domestic
The appearance of the low latitude open policy, the research and development to low latitude regulation technique, is also paid more and more attention.Digital broadcasting-television signal has band
It is wide, distance resolution is high, transmission power is stable and low latitude cover the advantages that, become one of effective detection means.So
And the signal structure, networking mode etc. are designed to adapt to the needs of communication, not directly as Radar emitter by it
It is avoidable to bring new problem, such as reference signal obtains, adaptive cancellation operand is big, cross ambiguity function operand is big asks
Topic.
Summary of the invention
Monitoring (such as unmanned plane detection, the target acquisition of forward scattering area) for the low latitude close-target in urban environment and
The problems such as existing radar detection method using digital television signal source needs to purify reference signal and operand is big, this
Invention proposes a kind of PN sequence target acquisition processing method using multicarrier DTMB signal, and this method is not necessarily to additional reference
Channel, making full use of PN sequence signature and average power signal is twice of frame average power signal, greatly reduces fortune
Calculation amount improves target acquisition performance simultaneity factor and more simply, more easily realizes in engineering, comprising the following steps:
Step 1: the DTMB signal that radar is received using locally known PN sequence carry out PN pattern-recognition with it is synchronous
PN sequence and compensating for frequency offset in DTMB signal are extracted in operation；
Step 2: carrying out multipath clutter interference suppression to the PN sequence that step 1 is handled using locally known PN sequence
System；
Step 3: carrying out coherent accumulation, i.e. coherent superposition, matched filtering to step 2 treated PN sequence signal, so
Carry out the processing such as subsequent object detecting and tracking again afterwards；
Preferably, above-mentioned steps one specifically:
It is step 1.1, related to received DTMB signal using known PN sequence, by between correlation peak and adjacent peak
Every identifying multicarrier DTMB signal PN mode, then carry out that DTMB signal is synchronous to be calculated again.
Step 1.2, using the DTMB signal synchronized, PN sequence is continuously extracted according to DTMB signal mode frame structure, remember
ForWherein n=0,1 ..., N-1, N are single PN sequence length, and m=1,2 ..., M, M is the PN sequence number of processing, i
For the number of PN sequence, corresponding value is the loop cycle of signal frame number, i.e.,
Wherein Nframe is DTMB signal frame maximum number, and Num is the quotient that M and Nframe are divided by；
Step 1.3, the PN sequence signal for extracting step 1.2 carry out carrier wave frequency deviation compensation i.e.Wherein fesThe carrier frequency estimated when synchronous for DTMB signal
Partially, fsFor DTMB signal baseband sample rate 7.56MHz, NsFor a DTMB signal frame length；
Preferably, specifically there are two types of processing methods for above-mentioned steps two:
Method 1, multipath clutter do not inhibit, and only do corresponding processing, make its multipath clutter auto-correlation with impulse function δ's
Property；Step 1 is obtained into PN sequenceWith local corresponding PN sequenceChannel estimation is carried out, and cannot will be in estimated value
Less than other local zero setting of threshold value, it is denoted as Resm；
Method 2, multipath clutter inhibit, i.e., the PN sequence signal that step 1 obtains are subtracted the multipath that channel estimation goes out, obtained
PN sequence after must inhibiting, the specific steps are.
Step 1 is obtained PN sequence by step 2.1With local corresponding PN sequenceCorrelated channels estimation is carried out, and is wanted
The local zero setting of threshold value will be less than, is denoted as
Step 2.2 will obtain PN sequenceSubtract local corresponding PN sequenceWithThe value of convolution, i.e.,Indicate convolution algorithm.
Preferably, specifically there are two types of processing methods for above-mentioned steps three:
Method 1, direct coherent superposition obtain target range echo information, i.e., the Res obtained step 2mIt is directly relevant folded
Add, obtain target range echo information, being then fed into the processing such as subsequent object detecting and tracking, (this method is suitble to low speed mesh
Mark)；
Method 2, matched filtering processing, obtain range Doppler two dimension modal data, specific steps are as follows:
Step 2 is obtained the PN sequence after clutter recognition by step 3.1With local corresponding PN sequenceIt is recycled
Apart from dimension data, i.e., correlation obtains echo-signal in fast time dimension
The data that step 1 obtains are done Fourier transformation acquisition range Doppler two-dimensional spectrum by step 3.2 on slow time dimension
Data are then fed into the processing such as subsequent object detecting and tracking.
It is not only needed using the external illuminators-based radar detection method of digital television signal source to reference signal compared to existing
Purification, and the problems such as subsequent clutter cancellation operand is big, cross ambiguity function operand is big, the present invention utilizes known number
The PN sequence of TV signal source carries out target acquisition, without additional reference channel, and makes full use of PN sequence signature (PN sequence
Average power signal is twice of body data mean power, has impulse function by PN sequence auto-correlation after handling accordingly
Property), greatly reduce operand, improve that target acquisition performance simultaneity factor is simpler, is easier to realize in engineering.
Detailed description of the invention
Fig. 1: for process flow block diagram of the present invention；
Fig. 2-1: for multicarrier DTMB signal frame structure schematic diagram；
Fig. 2-2: for multicarrier DTMB signal PN945 sequential structure schematic diagram；
Fig. 2-3: the PN_511 data segment schematic diagram of target acquisition is used for for PN945 sequence；
Fig. 3: for embodiment detect a frame aircarrier aircraft directly adopt coherent superposition treated the bistatic distance of target with
Time changing curve；
Fig. 4-1 is that embodiment detects a frame aircarrier aircraft using the range Doppler figure of clutter not suppressing method；
Fig. 4-2 is that embodiment detects a frame aircarrier aircraft using the range Doppler figure after clutter suppression method；
Fig. 4-3 is that embodiment detects the targetpath of a frame aircarrier aircraft and Automatic dependent surveillance broadcast (ADSB) is recorded
Information comparison diagram；
Fig. 5-1: for multicarrier DTMB signal PN420 sequential structure schematic diagram；
Fig. 5-2: the PN_255 data segment schematic diagram of target acquisition is used for for PN420 sequence；
Fig. 5-3: for the range Doppler figure of one frame unmanned plane of PN420 sequence detection.
Specific embodiment
The PN sequence target acquisition processing method based on multicarrier DTMB signal that the invention proposes a kind of, below by reality
It applies example and the technical solutions of the present invention will be further described in conjunction with attached drawing, DTMB signal frame structure is shown in attached drawing 2-1.
The present embodiment is illustrated by taking the PN945 sequence of DTMB signal mode three as an example, PN sequence signal structure
See Fig. 2-2.
(1) signal model
The frame head PN945 sequence of DTMB signal mode three be cyclic extensions 9 rank m-sequences, by a preamble PN217,
One PN511 sequence is constituted with PN217 synchronous after one, and frame head PN sequence signal mean power is frame average power signal
2 times, generation standard is detailed in GB20600-2006 " digital tv ground broadcasting frame structure, Channel Coding and Modulation ".
PN945 becomes PN_511 after removing cyclic prefix, sees Fig. 2-3, meets following equalities:
(2) identification of PN sequence pattern, extraction and frequency deviation compensate；
It is step 1, related with received DTMB signal respectively to PN945 sequence using known two zero phases PN420, pass through
Correlation peak and adjacent peak interval differentiate DTMB signal mode, wherein being used to relevant DTMB signal length is not less than two
Signal frame length, originally implement in be used to relevant DTMB signal length be taken as 20000,4725 are divided between adjacent peak
Unit, i.e. the PN sequence of multicarrier DTMB are PN945；
Step 2 synchronizes processing to the DTMB signal after identification, estimate frame head starting point number i=1 position and
Carrier wave frequency deviation fes(this measured data estimated value is fes=115.2Hz), PN_945 sequence is continuously extracted according to DTMB signal frame structure
Column, are denoted asWherein n=0,1 ..., 944, m=1,2 ..., 256, i=1,2 ... 200,1,2 ... 56；
Step 3, the PN sequence signal for extracting step 2 carry out carrier wave frequency deviation compensation i.e.fsFor DTMB signal baseband sample rate 7.56MHz, NsIt is one
DTMB signal frame length 4725；
(3) multipath clutter AF panel, PN sequence auto-correlation meet equation (1), and clutter and interferer suppression can use two kinds
Method, method 1, multipath clutter do not inhibit, and only do corresponding processing, its multipath clutter auto-correlation is made to have the property of impulse function δ
Matter, carrying out clutter reduction interference leads to raising for noise floor；Method 2, multipath clutter inhibit, constant spy when using multipath clutter
Property, multipath is estimated by the method for channel estimation first, then cuts multipath clutter.
Method 1, multipath clutter do not inhibit, and only do corresponding processing, make its multipath clutter auto-correlation with impulse function δ's
Property；PN sequence will be obtainedWith local corresponding PN sequenceRelevant calculation passes through iteration phase
The method that disappears successively eliminates multipath clutter interference, and specific implementation is divided into following four step.
Step 1, relevant calculation；
Step 2, estimation multipath clutter item number L；By the way that thresholding gate is arranged,In be greater than gate value peak value regard as
Thus multipath can calculate the item number L of multipath；WhereinThe general value of coef is 0.01
To 0.03；
Step 3 is found outMiddle peak-peakThen inhibit the multipath at other distance unit by following formula
Interference；
Then, by iteration successively fromIn find other multi-path peaksL=1 ... L-1 utilizes formulaMake multipath correlation that there is the property of impulse function δ, wherein Num=511；
Step 4 calculates PN sequenceData repeat step 1 and arrive step 3, until having handled all PN sequences, are denoted as
Resm。
Method two: multipath clutter AF panel passes through the method for channel estimation using invariant feature when multipath clutter first
Multipath is estimated, then inhibits the interference of multipath clutter by subtracting each other；
Step 1, first three step estimation multipath clutter using method one, and n ≠ nl, l=0,1 ... it sets in the place of L-1
Zero, it is denoted as
Step 2 will obtain PN sequenceSubtract local corresponding PN sequenceWithThe value of convolution obtains clutter recognition
PN sequence afterwards, i.e.,
Step 3 calculates PN sequenceData repeat steps 1 and 2, until having handled all PN sequences, are denoted as ym；
(4) coherent accumulation obtains target information, and there are two types of processing methods, and method 1 is folded by being concerned in a short time
Add and obtain target range information, method 2, matched filtering processing obtain the range Doppler two-dimensional signal of target.
Method one: direct coherent superposition obtains target range information, and wherein the general value of number M of PN sequence is 5 to 15,
The value of M was 10 (this method is suitble to slower-velocity target) in the present embodiment；I.e.
Attached drawing 3 be the embodiment directly adopt coherent superposition processing after, detect a live flying target it is bistatic away from
From the curve changed over time.
Method two: matched filtering processing obtains the range Doppler two dimension spectrum information of target, specific steps are as follows:
Step 2 is obtained the PN sequence after clutter recognition by step 1With local corresponding PN sequenceCarry out circulation phase
It closes and calculates, obtain echo-signal in fast time dimension apart from dimension data, i.e.,
The data that step 1 obtains are done Fourier transformation acquisition range Doppler two-dimensional spectrum number by step 2 on slow time dimension
According to, it may be assumed that R_D (n)=fft (R (n)), n=1,2..., 511.
This method is also suitble to multipath clutter not inhibit situation, directly general treated signal ResmFu is on slow time dimension
In leaf transformation obtain range Doppler two dimension modal data, R_D (n)=fft (Res (n)), n=1,2..., 511.
Whole system process flow is as described in Fig. 1.
Attached drawing 4-1 be in the embodiment one live flying target of detection using the range Doppler of clutter not suppressing method
Figure, as can be seen from the figure clutter shows as ideal drawing pin shape, will not raise noise floor, does not influence distant object detection.
Attached drawing 4-2 is the range Doppler that one live flying target of detection uses clutter suppression method in the embodiment
Figure, as can be seen from the figure clutter is suppressed, and target highlights.
Attached drawing 4-3 is that the track of a frame aircarrier aircraft is detected in the embodiment compared with ADSB record information, can from figure
To find out that target acquisition track and record information coincide substantially, illustrate to utilize the PN sequence signal source detection and processing method
Feasibility.
It should be understood that the present invention is equally applicable in the PN420 sequence of DTMB signal mode one (multi-carrier mode), it is attached
Fig. 5-1 is multicarrier DTMB signal PN420 sequential structure schematic diagram, and attached drawing 5-2 is the PN_ that PN420 sequence is used for target acquisition
255 data segment schematic diagrames.Attached drawing 5-3 is the range Doppler figure of one frame unmanned plane of PN420 sequence detection, illustrates to utilize
PN420 sequence can equally detect target.
Claims (4)
1. a kind of PN sequence target acquisition processing method based on multicarrier DTMB signal, it is characterised in that: comprise the steps of:
Step 1: carrying out PN pattern-recognition and synchronous fortune using locally known PN sequence to the DTMB signal that radar receives
It calculates, extracts the PN sequence and compensating for frequency offset in DTMB signal；
Step 2: carrying out multipath clutter AF panel to the PN sequence that step 1 is handled using locally known PN sequence；
Step 3: carrying out coherent accumulation, i.e. coherent superposition, matched filtering to step 2 treated PN sequence, then carry out again
Subsequent object detecting and tracking processing；
The step 1 specifically includes following steps；
It is step 1.1, related to received DTMB signal using known PN sequence, by correlation peak and adjacent peak interval come
It identifies multicarrier DTMB signal PN mode, then carries out the synchronous calculating of DTMB signal again；
Step 1.2, using the DTMB signal synchronized, PN sequence is continuously extracted according to DTMB signal mode frame structure, is denoted asWherein n=0,1 ..., N-1, N are single PN sequence length, and m=1,2 ..., M, M is the PN sequence number of processing, and i is
The number of PN sequence, corresponding value are the loop cycle of signal frame number, i.e.,Wherein Nframe be DTMB signal frame maximum number, Num be M with
The quotient that Nframe is divided by；
Step 1.3, the PN sequence signal for extracting step 1.2 carry out carrier wave frequency deviation compensation i.e.Wherein fesThe carrier frequency estimated when synchronous for DTMB signal
Partially, fsFor DTMB signal baseband sample rate 7.56MHz, NsFor a DTMB signal frame length；
The realization process of the step 2 are as follows:
Multipath clutter does not inhibit, and only does corresponding processing, and multipath clutter auto-correlation is made to have the property of impulse function δ；It will walk
Rapid one obtains PN sequenceWith local corresponding PN sequenceChannel estimation is carried out, and cannot will be less than threshold value in estimated value
Other place zero setting, are denoted as Resm。
2. a kind of PN sequence target acquisition processing method based on multicarrier DTMB signal as described in claim 1, feature
It is: the realization process of the step 2 are as follows:
Multipath clutter inhibits, i.e., the PN sequence signal that step 1 obtains is subtracted the multipath that channel estimation goes out, after being inhibited
PN sequence, specific steps are as follows:
Step 1 is obtained PN sequence by step 2.1With local corresponding PN sequenceChannel estimation is carried out, and door will be less than
The local zero setting of limit value, is denoted as
Step 2.2 will obtain PN sequenceSubtract local corresponding PN sequenceWithThe value of convolution, i.e., Indicate convolution algorithm.
3. a kind of PN sequence target acquisition processing method based on multicarrier DTMB signal as claimed in claim 2, feature
It is: the realization process of the step 3 are as follows:
Direct coherent superposition obtains target range echo information, i.e., the Res obtained step 2mDirect coherent superposition obtains target
Apart from echo information, it is then fed into subsequent object detecting and tracking processing.
4. a kind of PN sequence target acquisition processing method based on multicarrier DTMB signal as claimed in claim 3, feature
It is: the realization process of the step 3 are as follows:
Matched filtering processing, obtains range Doppler two dimension modal data, specific steps are as follows:
Step 2 is obtained the PN sequence after clutter recognition by step 3.1With local corresponding PN sequenceIt is related to carry out circulation,
Echo-signal is obtained in fast time dimension apart from dimension data, i.e.,
The data that step 3.1 obtains are done Fourier transformation acquisition range Doppler two-dimensional spectrum number by step 3.2 on slow time dimension
According to being then fed into the processing of subsequent object detecting and tracking.
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| CN107238820B (en) * | 2017-05-27 | 2019-12-10 | 武汉大学 | method and device for detecting forward scattering region target by using single channel |
| CN108985454B (en) * | 2018-06-28 | 2022-04-01 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Individual target identification method for civil aviation airliner |
| CN108919222A (en) * | 2018-07-17 | 2018-11-30 | 武汉大学 | A kind of phase-coherent accumulation detection method for even accelerated motional objects |
| CN112068081B (en) * | 2020-09-10 | 2022-07-12 | 西安电子科技大学 | OFDM frequency agile transmitting signal design method based on cyclic prefix |
| CN112861790B (en) * | 2021-03-10 | 2022-03-11 | 西南交通大学 | Electromagnetic detection network networking mode identification method based on deep learning |
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