CN108152810A - The transmitting of passive radar signal and reception system based on DTMB radiated waves - Google Patents
The transmitting of passive radar signal and reception system based on DTMB radiated waves Download PDFInfo
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- CN108152810A CN108152810A CN201710180355.7A CN201710180355A CN108152810A CN 108152810 A CN108152810 A CN 108152810A CN 201710180355 A CN201710180355 A CN 201710180355A CN 108152810 A CN108152810 A CN 108152810A
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- signal
- echo
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- dtmb
- reception
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Classifications
-
- 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
- G01S13/66—Radar-tracking systems; Analogous systems
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
- G01S13/06—Systems determining position data of a target
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/24—Acquisition or tracking or demodulation of signals transmitted by the system
- G01S19/25—Acquisition or tracking or demodulation of signals transmitted by the system involving aiding data received from a cooperating element, e.g. assisted GPS
- G01S19/256—Acquisition or tracking or demodulation of signals transmitted by the system involving aiding data received from a cooperating element, e.g. assisted GPS relating to timing, e.g. time of week, code phase, timing offset
-
- 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
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/24—Acquisition or tracking or demodulation of signals transmitted by the system
- G01S19/30—Acquisition or tracking or demodulation of signals transmitted by the system code related
-
- 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
- G01S7/36—Means for anti-jamming, e.g. ECCM, i.e. electronic counter-counter measures
Abstract
The invention discloses a kind of passive radar signal transmitting based on DTMB radiated waves and receive system, which is characterized in that including：Direct wave reception antenna, echo reception antenna, echo reception machine, through wave receiver, Beidou receiver, communication adapter and integrated data processing platform.Through the above way, the present invention can utilize the time reference benchmark of ground digital television signal, on the basis of existing GB terrestrial television standard agreement, its data format protocol is modified and optimized, by comparison time, Delay is estimated, realize and the three-dimensional of aerial mobile target is accurately positioned and early warning tracking, there is anti-stealth capability and strong antijamming capability, available for air defence system to search and warning, guiding and commander of aerial mobile target etc..
Description
Technical field
The present invention relates to the radar exploration technique field, more particularly, to a kind of passive radar signal based on DTMB radiated waves
Transmitting and reception system.
Background technology
At present, investigation uses passive radar and Connectors for Active Phased Array Radar in military affairs, and passive radar can only pass through reception
The electromagnetic wave that target is sent out finds target, and search capability is limited, does not apply to modernization military necessity.
On the contrary, most in modern military is all using monostatic radar, each of which radiation source is complete miniature
Radar can generate radar wave, you can itself generates radar wave active searching target, and search capability is stronger, but is also easy to exposure certainly
Body, and interfered or even destroyed, and monostatic radar cost is higher.
Therefore be badly in need of in military affairs it is a kind of at low cost, can active probe target, the passive radar of strong interference immunity.
Invention content
The technical problems to be solved by the invention are：There is provided it is a kind of based on DTMB radiated waves passive radar signal transmitting and
Reception system is, it can be achieved that actively search, warning, and reduce cost.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is：It provides a kind of based on DTMB radiated waves
Passive radar signal emits and receives system, including：Direct wave reception antenna, through wave receiver, echo reception antenna, echo
Receiver, Beidou receiver, communication adapter and integrated data processing platform；Wherein
Direct wave reception antenna emits signal for receiving terrestrial DTV direct wave；
Echo reception antenna is used to receive the terrestrial DTV transmitting signal that aerial target is reflected back；
The echo-signal that echo reception machine reflects for reception and processing target；
Through wave receiver is used to receive and handle the direct-path signal of transmitting station, and the multipath echo in signal is pressed down
System, filtering process；
Beidou receiver is used to receive time reference and the pulse per second (PPS) in Big Dipper satellite signal, as ground digital television signal
Time reference benchmark is supplied to single frequency adapter, modulator；Receiver is supplied to as Time transfer receiver simultaneously, for estimating
Delay；
Communication adapter is used for each Delay for acquiring echo reception machine, is carried out by wire/wireless communication transmission network
Adaptation processing；
Integrated data processing platform realizes the positioning of reflectance target by the echo time delay data acquired based on each receiving point, with
Track and display.
Wherein, the transmitting of passive radar signal and reception system based on DTMB radiated waves further include passive radar letter
Number emission system, for emitting radar signal, specifically, the passive radar signal transmitting system believes the time of big-dipper satellite
Breath is multiplexed into signal, while carries out spread processing to the temporal information in signal frame, to improve spreading gain, improves receiver
Sensitivity.
Wherein described passive radar signal transmitting system includes：Single frequency adapter, modulator, transmitter, the Big Dipper receive
Machine and transmitting antenna.
Wherein, the passive radar signal transmitting system is based on terrestrial digital TV standard agreement, and the multiplexing Big Dipper is taken to defend
Star temporal information, extension carry the frame number of temporal information, increase the spreading gain of temporal information；Modulation code check is reduced simultaneously, is noted
Enter emission source mark, and after coded modulation, signal is injected into transmitter, and pass through high gain array antenna and emit outward.
Wherein, the echo reception machine carries out the signal that receives frame decoding and the time difference parses, according to Doppler frequency shift,
The multipath characteristics of time delay and threshold value distinguish unlike signal, the time difference value of extraction effective target reflection signal, with reference to local
The big-dipper satellite temporal information of reception, in addition frame structure relevant information, obtains the aerial path delay of time information of echo-signal.
Wherein, echo reception machine uses digital processing technology, and target reflection echo signal passes through high-gain phased array array
Antenna receives, and by bandpass filter, amplifies into low-noise amplifier, amplified signal using frequency conversion, intermediate frequency filtering,
Analog-to-digital conversion is sent to DSP high speed processors, and carrying out the comparings such as phase, frequency, time delay to signal by high speed processor is handled,
Direct wave leakage signal and co-channel interference signal cancellation is made to decay, to purify out target reflection echo signal；Then again to echo
Signal is demodulated, de-spreads, and obtains big-dipper satellite temporal information；Meanwhile by the frame correlation with direct wave, extrapolate time delay
Information with reference to the local big-dipper satellite time, obtains the precise delay information of echo.And the precise delay information is passed through communication
Adapter exports.
Wherein, the integrated data processing platform includes positioning and tracking module, operation and control module, information display module
With networking planning module.
The beneficial effects of the present invention are：The prior art is different from, the present invention utilizes the time of ground digital television signal
Reference data on the basis of existing GB terrestrial television standard agreement, is modified and is optimized to its data format protocol, leads to
It crosses comparison time, estimates Delay, realize and the three-dimensional of aerial mobile target is accurately positioned and early warning tracking, had anti-stealthy
The features such as ability and strong antijamming capability, available for air defence system to the search of aerial mobile target and warning, guiding and commander
Deng.
Description of the drawings
Fig. 1 is the transmitting of the passive radar signal based on DTMB radiated waves of the present invention and receives System Working Principle signal
Figure；
Fig. 2 is the operation principle schematic diagram of through wave receiver echo and interference cancellation；
Fig. 3 is the operation principle schematic diagram of echo reception machine；
Fig. 4 is DTMB signal frame structure schematic diagrames；
Fig. 5 is the DTMB signal frame time domain waveforms that PN420 is frame head；
Fig. 6 is to carry out the oscillogram after multiple correlation with echo-signal using the PN sequences locally generated.
Specific embodiment
For the technology contents that the present invention will be described in detail, the objects and the effects, below in conjunction with embodiment and coordinate attached
Figure is explained.
DTMB so-called first, English full name are Digital Television Terrestrial Multimedia
Broadcasting, Chinese full name are " digital television ground broadcast transmission system frame structure, Channel Coding and Modulation ".DTMB branch
The multiple business pattern such as HDTV, SDTV, data broadcasting, internet, messaging is held, support fixed, portable, walking and is moved at a high speed
It is dynamic to receive, support a variety of networking modes such as single frequency network, multiple frequency network, MFN.By combining different carrier modes, channel coding, Signed Star
Seat mapping mode, frame head mode etc., DTMB supports 330 kinds of operating modes altogether.The present invention for monostatic radar be subject to be disturbed with
The problems such as destruction is radiation source using the digital signal of large number of ground DTV Base Transmitter, is provided a kind of based on DTMB spokes
The passive radar signal transmitting of ejected wave and reception system.
Fig. 1 is please referred to, the transmitting of passive radar signal and reception system the present invention is based on DTMB radiated waves include：Direct wave
Reception antenna 1, echo reception antenna 2, echo reception machine 3, through wave receiver 4, Beidou receiver 5, communication adapter 6 and comprehensive
Close data processing platform (DPP) 7；Its System Working Principle is as shown in Figure 1, wherein
Direct wave reception antenna 1 emits signal for receiving terrestrial DTV direct wave；
Echo reception antenna 2 is used to receive the terrestrial DTV transmitting signal that aerial target is reflected back；
The echo-signal that echo reception machine 3 reflects for reception and processing target；
Through wave receiver 4 is used to receive and handle the direct-path signal of transmitting station, and the multipath echo in signal is pressed down
System, filtering process；
Beidou receiver 5 is used to receive time reference and the pulse per second (PPS) in Big Dipper satellite signal, as ground digital television signal
Time reference benchmark, be supplied to single frequency adapter, modulator；Receiver is supplied to as Time transfer receiver simultaneously, for estimating
Calculate Delay；
Communication adapter 6 is used for each Delay for acquiring echo reception machine, is carried out by wire/wireless communication transmission network
Adaptation processing；
Above-mentioned single frequency adapter and modulator is a component part of digital television modulation system, and communication adapter is used
In ranging.
Integrated data processing platform 7 realizes determining for reflectance target by the echo time delay data acquired based on each receiving point
Position, tracking and display.
Wherein, the transmitting of passive radar signal and reception system based on DTMB radiated waves further include passive radar letter
Number transmitting subsystem, as the emission source of radar signal, mainly by single frequency adapter 81, modulator 82, transmitter 83, the Big Dipper
Receiver 84 and 85 grade of digital television transmitting aerial composition.In the present invention, on the basis of conventional digital TV emission system,
The temporal information of big-dipper satellite is more accurately multiplexed into signal, while carries out spread processing to the temporal information in signal frame,
To improve spreading gain, the sensitivity of receiver is improved.
Specifically, the transmitting of passive radar signal and reception system based on DTMB radiated waves of the invention are based on state
Terrestrial digital TV standard agreement is marked, utilizes the key technology of standard agreement：Such as OFDM modulation, LDPC codings lead to
The key technologies such as letter spread spectrum, inherit these key technology high code-rates, anti-interference, the technical characterstics such as high spectrum utilization；And
On this basis, multiplexing big-dipper satellite temporal information is taken；Extension carries the frame number of temporal information, increases the spread spectrum of temporal information
Gain；The technical measures such as modulation code check, injection emission source mark are reduced, to increase the detectability of radar signal.It was transformed
Numerical value TV signal is launched by tens thousand of transmitting base stations, as the irradiation source of radar system, realizes that territory spatial domain is covered entirely
Lid.
Signal is reflected when digital television signal encounters aerial mobile target and will generate；Each echo reception antenna receives anti-
It penetrates signal to purify by echo reception machine, offsets to go directly using reference signal and involve interference signal, the reflection signal needed；
Frame decoding and time difference parsing are carried out to the signal received, distinguished according to multipath characteristics such as Doppler frequency shift, time delay and threshold values
Unlike signal, the time difference value of extraction effective target reflection signal, while echo-signal and the correlation of direct-path signal are utilized, it carries
The accuracy of high Delay, while improve distance exam precision.With reference to the big-dipper satellite temporal information of local reception, in addition frame
Structurally interrelated information obtains the aerial path delay of time information of accurate echo-signal.It is passed again by communication adapter through transmission network
It is defeated to arrive complex datahandling centre；The data that complex datahandling centre sends each road echo time difference resolution unit synchronize
Parallel acquisition realizes the search to aerial mobile target, positioning, tracking and display with calculating.
And through wave receiver is received DTMB signals by antenna, and digital reconstruction regeneration, filter are carried out to the signal
Go out multipath echo and interference, generate pure DTMB frame signals, echo and interference cancellation principle are as shown in Figure 2.
Cancellation techniques, which can be used, is inserted into weak pseudo-code channel estimation cancellation techniques scheme, and this cancellation techniques scheme is that signal is set
The function is added in transmitting signal by timing, this also can be considered the build-in attribute in source, and the first algorithm for estimating of channel is using slotting
Enter the method for pseudo-code, i.e., upon receipt of the signals, channel estimation is carried out using this algorithm, those skilled in the art also can basis
Actual conditions take other kind of algorithm to carry out channel estimation, design the CAZAC codes of a local, this yard has strong auto-correlation
Characteristic.The training sequence is uncorrelated to ofdm signal, therefore relevant method may be used and more accurately obtain echo channel
Condition responsive.
Consider since small variation will occur for the influence of weather or other factors, the characteristic of channel in practical application, because
This just needs to realize the practical characteristic of channel using step ADAPTIVE LMS ALGORITHM is become into line trace.Certainly due to substantially
The characteristic of channel (just estimating) of capture systems, therefore can be filtered acquired channel impulse response value as automatic adaptation FIR
The initial filter coefficients of device this LMS algorithm is restrained faster.Conceptual design two-way A/D has received two paths of signals, connects
The collection of letters number is digital television signal source；Reference signal is the pure letter for not being mixed into echo-signal returned from transmitting antenna leading
Number, which is used to calculate filter coefficient and update FIR filter coefficient from LMS algorithms.
Since system time delay itself is less than 5 μ s, and much larger than a code symbol period, therefore can be to avoid receiving and transmitting signal
Auto-correlation influence, that is to say, that the echo to retransmit signal only with receiving terminal receive signal have uncorrelated characteristic, so
Interference cancellation can be realized without fuzzy extraction with wave signal.It is the sum of digital television signal and echo-signal to receive signal, is passed through
It offsets to obtain and offsets rear digital television signal.
Wherein, the component part as this system most critical, the echo reception machine carry out frame solution to the signal received
Code and time difference parsing distinguish unlike signal according to the multipath characteristics of Doppler frequency shift, time delay and threshold value, and extraction effective target is anti-
The time difference value of signal is penetrated, with reference to the big-dipper satellite temporal information of local reception, in addition frame structure relevant information, obtains echo
The aerial path delay of time information of signal.
Specifically, echo reception machine uses digital processing technology, and target reflection echo signal is phased a burst of by high-gain
Array antenna receives, and by bandpass filter, amplifies into low-noise amplifier, and amplified signal is filtered using frequency conversion, intermediate frequency
Wave, analog-to-digital conversion are sent to DSP high speed processors, and the comparings such as phase, frequency, time delay are carried out to signal by high speed processor
Reason makes direct wave leakage signal and co-channel interference signal cancellation decay, to purify out target reflection echo signal；Then again to returning
Wave signal is demodulated, de-spreads, and obtains big-dipper satellite temporal information；Meanwhile by the frame correlation with direct wave, when extrapolating
Prolong information, with reference to the local big-dipper satellite time, obtain the precise delay information of echo.And the precise delay information is passed through logical
Believe adapter output, operation principle is as shown in Figure 3.
Echo reception machine is directly related to receiving sensitivity and the threshold CNR of system, and performance indicator determines passive
Can radar system carry out long-range target acquisition and the recognition capability to stealth target.The unit demodulates DTMB letters first
Number, it is extracted from frame head, the big-dipper satellite temporal information when number of transmitter and this frame are sent out；Believed with the time demodulated
Breath, satellite time information during with local reception to this frame are compared, entry evaluation of the difference as echo-signal time delay,
Judgement at the beginning of doing one to the position of reflectance target, convenient for the quick detect and track of reflectance target.
It is civilian C/A codes and military P (Y) code respectively there are two types of the pseudo-code that big-dipper satellite alignment system uses has altogether.
C/A code frequency 1.023MHz, one millisecond of repetition period, intersymbol is equivalent to 300m away from 1 microsecond；P code frequency 10.23MHz are repeated
In 266.4 days periods, intersymbol is equivalent to 30m away from 0.1 microsecond.Therefore, the time service based on big-dipper satellite, if using civilian C/A
Code, theoretically the error of echo path assessment is at 300 meters or so.And if using military P (Y) code, what precision can improve
30 meters or so.
To obtain the more precise position information of reflectance target, need to Delay, further accurate, we are using directly
Up to reference signal wave, the frame correlation with echo-signal, to further increase raising precision.
The base unit of DTMB signals is signal frame, and signal frame is made of frame head and frame.Frame head by P N Sequence compositions,
There are three types of option, respectively 420,595 and 945 for length.System information is carried in the frame head of superframe, including big-dipper satellite
Temporal information and send out this frame transmitter number and geographical location information.Signal frame body structure is divided into 4 layers：Day frame, framing,
Superframe, signal frame, as shown in Figure 4.
Wherein header signal is made of PN sequences, since PN sequences have very strong autocorrelation, can be used as ofdm signal
Timing signal, and for the estimation of channel and frequency deviation.This principle is based on, passes through the signal to direct wave and back wave
Multiple correlation operation is carried out, extracting time information can be positioned and tracked to target by the principle of three-point fix.
It is as shown in Figure 5 in the signal waveform of time domain as the practical complete digital television signal of a frame of frame head using PN420.
Fig. 6 is shown carries out the result of calculation obtained after multiple correlation using the PN sequences locally generated and echo-signal,
Since the PN sequences that national standard defines increase cyclic prefix and cyclic suffix, so will appear 3 phases after a relevant operation
Guan Feng, i.e. a main peak and two submaximums, can be by average algorithm or by position in order to obtain the exact position of main peak
Compare the position that true main peak is cut in the acquisition of the auxiliary informations such as selection.
The form of two kinds of PN sequences, i.e. stationary phase and rotatable phase defined in national standard.Due to holding for wherein signal frame
The continuous time is most short for 555.56us, i.e. signal can pass by 166668 meters in a signal frame duration, i.e., is not adding it
The range ambiguity that direct relevant peaks detection technique is used to have 166668 meters in the case of his auxiliary signal is receiving systems more
In the case of alignment by union, this range ambiguity can be eliminated by specific algorithm.And when signal is using rotatable phase
Pattern, since two neighboring PN sequences are inconsistent, there is no the effects of range ambiguity, you can is realized by relevant peaks detection technique
It realizes the extraction of information, obtains the result of positioning.Therefore system accuracy is just determined by the precision of the synchronization point of PN sequences,
Generally use following technology
1）Channel compensation：The shock response of channel can be obtained by LS algorithms generally before signal processing is carried out and compensates letter
Road, to eliminate influence of the channel to system.
2）Over-sampling：The symbol rate of DTMB be 7.56Msps, i.e., 39.6825 meters of the precision handled using the rate.
In the case of using 20 times of over-sampling, i.e. system operation is obtaining bringing for over-sampling under the clock of 151.20MHz
Precision can be further increased to 1.9841 meters outside processing gain.
3）Phaselocked loop：The phase of carrier wave is locked by PHASE-LOCKED LOOP PLL TECHNIQUE, so as to further improve the precision of system.Due to being
System has very high C/N0, therefore phaselocked loop can restrain rapidly, meets the requirement of real-time of system.
4）Automatic growth control（AGC）：The fine or not precision by the system that directly affects of AGC, passes through the control to front-end A P
The echo-signal received can be locked in an appropriate performance number by system and digital AGC, to obtain the property that system optimal is got over
Energy.
Receiving sensitivity is a key index for determining radar range and detecting emitting substance size, to improve this property
Can we mainly employ following measure：
Based on the passive radar scheme of more than DTMB reception techniques, first need respectively to carry out direct signal and reflection echo signal
Channel filters, and the DTMB radiofrequency signals of the 8MHz bandwidth for detection is selected, since filtering can damage signal power
It loses, needs to be amplified before filtering.
Since DTMB receivers meeting locking synchronization is to peak signal, the multipath of display is the PN long on the basis of peak signal
In the window of degree, it is therefore desirable to carry out automatic growth control to ensure direct signal that receiver receives than emitting signal power
Greatly a bit.In addition when multipath is shown and is judged, it normally will be less than multipath more than 20 d B of most powerful path and be judged as noise, therefore
Automatic growth control is also required to ensure that reflection signal power is not less than 20d B than direct signal.Experience have shown that DTMB receivers
The about 3 d B of direct signal power ratio reflection signal people of input are best.
In a specific embodiment, the integrated data processing platform includes positioning and tracking module, operation and control
Module, information display module and networking planning module, to provide man-machine interactive platform.
The problems such as present invention is subject to be disturbed and destroy for monostatic radar, the passive thunder based on DTMB radiated waves provided
Emitting up to signal and receive system, the digital signal for making full use of large number of ground DTV Base Transmitter is radiation source,
On the basis of existing GB terrestrial television standard agreement, its data format protocol is modified and optimized, realizes same set of system
System, as the signal source of radar, forms stealthy radar system while normal transmission wireless digital TV-set program service masses.
It is handled, the parsing and integrated data processing of echo time difference information, is realized to aerial mobile mesh by the frame to target echo
Target three-dimensional is accurately positioned to be tracked with early warning, has the characteristics that anti-stealth capability and strong antijamming capability, available for air defence system
Search and warning, guiding and commander to aerial mobile target etc., while cost is reduced, provide real-time air situation letter to command troops
Breath.
The foregoing is merely the embodiment of the present invention, are not intended to limit the scope of the invention, every to utilize this hair
The equivalents that bright specification and accompanying drawing content are made directly or indirectly are used in relevant technical field, similarly include
In the scope of patent protection of the present invention.
Claims (8)
1. a kind of transmitting of passive radar signal and reception system based on DTMB radiated waves, which is characterized in that including：Direct wave connects
Receive antenna, echo reception antenna, echo reception machine, at through wave receiver, Beidou receiver, communication adapter and integrated data
Platform；Wherein
Direct wave reception antenna emits signal for receiving terrestrial DTV direct wave；
Echo reception antenna is used to receive the terrestrial DTV transmitting signal that aerial target is reflected back；
The echo-signal that echo reception machine reflects for reception and processing target；
Through wave receiver is used to receive and handle the direct-path signal of transmitting station, and the multipath echo in signal is pressed down
System, filtering process；
Beidou receiver is used to receive time reference and the pulse per second (PPS) in Big Dipper satellite signal, as ground digital television signal
Time reference benchmark is supplied to single frequency adapter, modulator；It is supplied to recycling receiver and through wave receiver conduct simultaneously
Time transfer receiver, for estimating Delay；
Communication adapter is used for each Delay for acquiring echo reception machine, is carried out by wire/wireless communication transmission network
Adaptation processing；
Integrated data processing platform realizes the positioning of reflectance target by the echo time delay data acquired based on each receiving point, with
Track and display.
2. the transmitting of passive radar signal and reception system, feature according to claim 1 based on DTMB radiated waves exist
In the temporal information of big-dipper satellite is multiplexed into letter by the transmitting of passive radar signal and reception system based on DTMB radiated waves
In number, while spread processing is carried out to the temporal information in signal frame, to improve spreading gain.
3. the transmitting of passive radar signal and reception system, feature according to claim 2 based on DTMB radiated waves exist
In further including：Single frequency adapter, modulator, transmitter, Beidou receiver and digital television transmitting aerial.
4. the transmitting of passive radar signal and reception system, feature according to claim 2 based on DTMB radiated waves exist
In the transmitting of passive radar signal and reception system based on DTMB radiated waves are based on terrestrial digital TV standard agreement, adopt
Multiplexing big-dipper satellite temporal information is taken, extension carries the frame number of temporal information, increases the spreading gain of temporal information；It reduces simultaneously
Code check, injection emission source mark are modulated, and after coded modulation, signal is injected into transmitter, and pass through high-gain array day
Line emits outward.
5. the transmitting of passive radar signal and reception system, feature according to claim 1 based on DTMB radiated waves exist
In the echo reception machine carries out frame decoding to the signal received and the time difference parses, according to Doppler frequency shift, time delay and thresholding
The multipath characteristics of value distinguish unlike signal, the time difference value of extraction effective target reflection signal, with reference to the Big Dipper of local reception
Satellite time information, in addition frame structure relevant information, obtains the aerial path delay of time information of echo-signal.
6. the transmitting of passive radar signal and reception system, feature according to claim 5 based on DTMB radiated waves exist
In echo reception machine uses digital processing technology, and target reflection echo signal passes through high-gain phased array array antenna received, warp
Bandpass filter is crossed, is amplified into low-noise amplifier, amplified signal is sent using frequency conversion, intermediate frequency filtering, analog-to-digital conversion
Toward DSP high speed processors, the comparings such as phase, frequency, time delay are carried out to signal by high speed processor and are handled, let out direct wave
Reveal signal and the attenuation of co-channel interference signal cancellation, to purify out target reflection echo signal；Then echo-signal is solved again
It adjusts, despreading, obtains big-dipper satellite temporal information；Meanwhile by the frame correlation with direct wave, Delay is extrapolated, with reference to
The local big-dipper satellite time obtains the precise delay information of echo.
7. and the precise delay information is exported by communication adapter.
8. the transmitting of passive radar signal and reception system, feature according to claim 1 based on DTMB radiated waves exist
In the integrated data processing platform includes positioning to be planned with tracking module, operation and control module, information display module and networking
Module.
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Cited By (6)
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| CN111650563A (en) * | 2020-06-15 | 2020-09-11 | 桂林电子科技大学 | System and method for quickly estimating co-channel interference time delay and energy of external radiation source radar |
| CN114167399A (en) * | 2022-02-15 | 2022-03-11 | 中国人民解放军火箭军工程大学 | Range radar system based on same-frequency sensing and opportunistic transmission and implementation method |
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| CN109633560A (en) * | 2018-11-27 | 2019-04-16 | 成都天奥信息科技有限公司 | A kind of anti-interference synchronism in the same frequency method of interframe applied to radar processing |
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| CN111436048A (en) * | 2019-02-03 | 2020-07-21 | 维沃移动通信有限公司 | Method and communication device for supporting time-sensitive communication |
| CN110412562A (en) * | 2019-06-29 | 2019-11-05 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Airborne distance measuring equipment health degree appraisal procedure |
| CN110412562B (en) * | 2019-06-29 | 2022-06-14 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Health degree evaluation method for airborne distance measurement equipment |
| CN114651422A (en) * | 2019-11-14 | 2022-06-21 | 索尼集团公司 | Communication device and method for secure communication |
| CN111650563A (en) * | 2020-06-15 | 2020-09-11 | 桂林电子科技大学 | System and method for quickly estimating co-channel interference time delay and energy of external radiation source radar |
| CN111650563B (en) * | 2020-06-15 | 2022-05-31 | 桂林电子科技大学 | System and method for quickly estimating co-channel interference time delay and energy of external radiation source radar |
| CN114167399A (en) * | 2022-02-15 | 2022-03-11 | 中国人民解放军火箭军工程大学 | Range radar system based on same-frequency sensing and opportunistic transmission and implementation method |
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