CN104168040B - The intelligent despread-and-demodulation method and device of the navigation association multiplexed signals of band sharing - Google Patents
The intelligent despread-and-demodulation method and device of the navigation association multiplexed signals of band sharing Download PDFInfo
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Abstract
The present invention relates to the navigation association multiplexed signals of band sharing and intelligent despread-and-demodulation method and its used device, generation is specifically included by parasitic signal text and the navigation time service text of parasitism, to being modulated by parasitic signal and parasitic signal, modulation carries out the steps such as Power Control to intermediate frequency or radio frequency band to parasitic signal；Intelligent despread-and-demodulation device of the present invention is by the composition such as parasitic signal generation module, positioning stamp signal generator module, intermediate frequency or radio frequency combining module.The superior effect of the present invention is, the method that association navigator fix signal realizes pseudo range measurement and positioning on communication broadcast channel, make use of pseudo-random code spread-spectrum technology, the situation of the navigator fix signal low-power parasitism of association is made up with spreading gain.On the premise of not influenceing by parasitic communication broadcast signal, it can be achieved with surveying pseudorange and positioning with the navigator fix signal of association, the navigator fix signal of the association of Pseudo Code Spread Spectrum, there is disguised and anti-interference.
Description
Technical field
The present invention relates to communication, broadcast and navigation field, is that a kind of utilization communication or broadcast channel realize location navigation
Method and apparatus.
Background technology
At present, satellite navigation system is widely used to navigator fix and the time service of outdoor, but in the street high building in city
Between, in high and steep mountains, in the deep mountain stream of valley and Jungln Jam, satellite navigation signals can be blocked, signal intensity can significantly by
Decline, so as to influence the effect of navigator fix.Particularly indoors under environment when, the signal of satellite navigation system is difficult to direct projection and entered
Enter interior, even if signal is got in after reflection or diffraction, signal intensity also can be significantly attenuated, and signal is very disorderly,
Even signal can be distorted, it is difficult to meet indoor positioning, navigation and time service demand.
And there is stronger signal covering power the base station of land mobile communication broadcast system, it can both make up to work as in outdoor and defend
The application of some occasions when star navigation signal is blocked or declined, indoor most of region can also be directly covered, makes up and defends
Star navigation signal is difficult to the situation covered indoors.So, if land mobile communication system, terrestrial broadcast system can be made full use of
And the transmission signal of various information sensing nets, it just can overcome the disadvantages that satellite navigation system in ground some regions signal covering power
Deficiency, the navigator fix under indoor environment is particularly can overcome the disadvantages that, so as to realize that indoor and outdoor seamless navigation positions.
In the prior art, such as application for a patent for invention number is CN201010503298.X, a kind of entitled satellite
Navigation locating method, methods described include：Step A, navigation satellite signal is received, obtains the signal intensity of Present navigation satellite,
Calculate the current location of the satellite navigation positioning device；Step B, according to the present bit obtained by previous reception satellite-signal
Put, the speed of the navigational satellite receiver and the time difference for receiving satellite-signal twice, estimate satellite navigation positioning
The current location of device；Step C, between the current location obtained by current location and the estimation according to obtained by the calculating
Distance difference and CEP values, judge whether the current location obtained by the calculating needs to correct；Step D, if necessary to correct,
Correct the current location of the satellite navigation positioning device.After technical scheme, by using receiver speed
It is combined with CEP values under unlike signal intensity, the essence of receiver system to receiver location data Smoothing fit, can be improved
Degree, is adapted to the various global global position system such as the Big Dipper and GPS.
And for example in the prior art, application for a patent for invention number is CN201310044075.5, and entitled " a kind of Big Dipper is defended
Star navigation positioning system radio frequency transceiver ", it is characterised in that including：It is the low-noise amplification circuit that is sequentially connected, the first frequency mixer, outer
Put wave filter, amplifier, I/Q frequency mixers, intermediate frequency variable gain amplifier, low pass filter, 2 analog/digital converters, connect
Receipts machine phaselocked loop, emitter phaselocked loop；Opener power amplifier, radio frequency attenuator, frequency mixer, the LPF being sequentially connected
Device；And left voltage controlled oscillator, voltage controlled oscillator auto-calibration circuits, right voltage controlled oscillator, 50MHz phaselocked loops, SPI deposit
Device, upper voltage controlled oscillator, automatic gain control loop；The frequency mixer, emitter phaselocked loop, left voltage controlled oscillator, voltage-controlled shake
Device auto-calibration circuits, right voltage controlled oscillator, 50MHz phaselocked loops is swung to be sequentially connected；The SPI registers, voltage controlled oscillator are certainly
Dynamic calibration circuit, upper voltage controlled oscillator, receiver phaselocked loop, the first frequency mixer are sequentially connected；The SPI registers increase with automatic
Beneficial control loop connection；The automatic gain control loop is connected with intermediate frequency variable gain amplifier.The receiver phaselocked loop
The voltage controlled oscillator of lc circuit structure is used with emitter phaselocked loop.It is automatic that the radio frequency transceiver is provided with voltage controlled oscillator
Calibrate circuit.The radio frequency transceiver uses the power supply with power management function.
Foregoing invention patent application be difficult to solve satellite navigation system between the street high building in city, in high and steep mountains,
In the deep mountain stream of valley and Jungln Jam transmission, cause satellite navigation signals to be blocked, signal intensity can significantly be declined,
Influence the effect of navigator fix.
Particularly indoors under environment when, the signal of satellite navigation system is difficult to direct projection and got in and to signal intensity
Can significantly it be attenuated, signal is very disorderly, or even signal can be distorted, it is difficult to meets that indoor positioning etc. is difficult to the technology gone beyond
Problem.
The content of the invention
Head of the present invention puies forward the theory of positioning stamp signal, is a kind of leading for parasitic navigator fix information on existing communication channel
Navigate communicating integral signal system, there is provided and realize signal generation, transmission, the method intelligently received of navigational communications integration
And its related device, reach the purpose that high-precision indoor and outdoor seamless positioning navigation is realized using communication channel.
Particular technique solution of the present invention is that navigator fix information is modulated with pseudo-random code spread-spectrum, and is formed
Can ranging positioning stamp signal.Pseudo noise code can be the diversified forms such as Gold codes, Walsh codes or Chaotic Sequence Code.
Positioning stamp signal parasitism is divided into two to formation navigation on signal of communication with communicating integral signal, its parasitic method
Kind.One kind is that positioning stamp signal mixes in space propagation with signal of communication and is superimposed synthesis mode；Another kind is that two kinds of signals are each
The mode synthesized after automodulation in intermediate frequency or radio frequency, amplifies through power amplifier device again after synthesis, finally from antenna end toward space
Transmitting.It is simple that this two classes synthetic method forms convenience, its device structure used.
When navigational communications integration signal is transferred at user's receiving terminal, signal is received by antenna, low noise amplification dress
Put it is big, downconvert to intermediate frequency after, be sampled into data signal.Positioning stamp signal is spread-spectrum signal (spreading gain is designated as A), positioning
Stamp signal level is B less than the value of signal background level, and B values typically take stabs less than more than signal of communication 20dB, at this moment positioning
Signal has not interfered with normally receiving for signal of communication.When spreading gain A, which meets A, subtracts B more than demodulation threshold, it is possible to realize
The despreading and demodulation of positioning stamp signal, the propagation time of signal can be measured during despreading, obtain signal source the distance between to user,
For Positioning Creates condition.
The intensity of parasitic positioning stamp signal is lower, to smaller by the influence of the signal of communication of parasitism, but corresponding positioning
The spreading gain requirement of stamp signal will increase, to ensure to remain to the requirement for meeting demodulation threshold.Intelligence proposed by the present invention is adjusted
Demodulation method processed, the requirement to spreading gain can be reduced.Because during intelligence despreading, try hard to eliminate or most of cancellation is parasitic
Communication signal power, enable intelligence when de-spreading the background-noise level of positioning stamp signal be greatly lowered.At this moment, if demodulation
Threshold requirement is constant, then the requirement can to spreading gain reduces.If being had learned that or easily identified by the signal of communication of parasitism,
Then to eliminate by parasitic signal of communication, comparatively be that by；If unknown or be difficult to identify by the signal of communication of parasitism,
Then need to remove the master mode of signal of communication or several secondary mode using modal analysis method, singular value decomposition method etc., equally
The purpose for the signal background level for reducing positioning stamp signal can be reached.
Reduction to the navigator fix signal spread-spectrum gain requirement of association, be advantageous to increase navigator fix information rate, pressure
Low spreading code code frequency, reduce by parasitism communication broadcast channel band width so that the navigator fix signal of association and should
With more generalization.
The content of navigator fix information includes the numbering and position, clock time and correction factor, the work shape of base station in source
The air pressure of state information and base station, temperature information etc..Navigator fix information can be worked out independently, can also use the navigation of standard
Textual information form is positioned, the realization of terminal is advantageous to using the navigator fix textual information form of standard, is also beneficial to chip
Recycling.
Receiver user pseudo-code measurement of correlation time delay, and utilize the navigator fix information data for positioning text transmission
To calculate position, speed and the time where it.The data volume that navigator fix information can transmit is limited, to improve
The precision of navigator fix is, it is necessary to make the position in source and pseudo range measurement obtains more accurate, it is necessary to which to consider that associated arguments have more, more smart
True correction means and amendment data, need to meet actual demand using the more preferable VEC of performance, transmission for this
Error correction parameter.
The present invention proposes a kind of navigation association multiplexed signals of band sharing and intelligent despread-and-demodulation method, specific steps
It is as follows：
Step 1: generation is by parasitic signal text and the navigation time service text of parasitism, including following three parts：
1st, generated using existing ripe application apparatus by parasitic signal text, can be broadcast singal, the movement of ground honeycomb
Signal of communication, satellite communication signals or other kinds of signal；
2nd, using high accuracy navigate Timing Receiver positioning and timing function, obtain information source three-dimensional location coordinates information and
Temporal information, and framing processing generation positioning stamp text is carried out to it；
3rd, pseudorandom code word is generated, Gold codes, Walsh codes, chaos sequence or other kinds of spread spectrum code word can be selected；
The generation of above text is by the Coordinated Universal Time(UTC) and pulse per second (PPS) for Timing Receiver offer of navigating in high precision as the time
Benchmark, SECO is carried out by pulse per second (PPS).
Step 2: to being modulated by parasitic signal and parasitic signal, modulate to intermediate frequency or radio frequency band：
1st, to being modulated by parasitic signal text, modulation system is according to its original system signal system；
2nd, positioning stamp text and pseudorandom code word are subjected to XOR, complete band spectrum modulation, then close by direct sequence
Digital to analog conversion is carried out into chip, generates intermediate frequency or radiofrequency signal.
Step 3: carrying out Power Control to parasitic signal, its power is set not influence by parasitic signal normal work.
Step 4: to being combined processing by parasitic signal and parasitic signal, the two is shared frequency range and channel, generate with
Pervasive association navigator fix signal existing for multiplexed signals form.
Step 5: carrying out up-conversion to the multiplexed signals after combining, it is converted into by the radio frequency band of parasitic signal.
Step 6: being filtered to the multiplexed signals after up-conversion, power amplification, launched by antenna.
Step 7: receiving multiplexed signals by antenna, and it is amplified, filtering process.
Step 8: carrying out down coversion to amplification, filtered multiplexed signals, intermediate frequency or zero intermediate frequency are converted into.
Step 9: carrying out branch to the multiplexed signals after down coversion, and it is respectively processed.
Step 10: being demodulated all the way by by the signal system of parasitic signal to therein, text is demodulated.
Step 11: carrying out SHL intelligence despread-and-demodulations to another way signal, following steps are specifically divided into：
1st, temporally length carries out temporary processing to the signal after being sampled first by buffer to modulus；
2nd, the parasitic text demodulated is modulated according to parasitic signal system, generates original parasitic signal；
3rd, inversion operation is carried out by phase inverter to the parasitic signal regenerated, for example, 4 bits represent decimal number 5
For 0101, negate as -5, the complement of two's two's complement is expressed as 1011；4 bits represent that decimal number -4 is 1100, negate as 4, two enter
Be made as 0100, carry out 180 degree phase bit flipping, generate inversion signal, further for：
(1) make inversion signal with etc. the modulus sampling temporary signal of time span sum operation is carried out by adder, this
It is equivalent to be superimposed anti-phase parasitic signal so as to eliminate ambient noise, signal is stabbed in remaining parasitic positioning,
(2) signal is stabbed to the positioning for eliminating ambient noise and carries out spread spectrum demodulation, obtain navigator fix information.
Step 12: what is normally demodulated each carries out corresponding further place by parasitic signal and parasitic positioning stamp signal
Reason, is independent of each other.
The invention also provides a kind of navigation association multiplexed signals of band sharing and intelligent despread-and-demodulation device, the dress
Put by being formed with lower module：
1st, parasitic signal generation module, can be broadcast singal driver, ground cellular mobile communication base band, satellite communication
Base band or other digital basebands, the parasitic signal generation module include following submodule：
(1) parasitic text generation module, generate digital information according to the frame format of parasitic signal and export to parasitic text
Modulation module；
(2) parasitic text modulation module, digital to analog conversion is carried out according to the signal system of parasitic signal, modulates to intermediate frequency or penetrates
Frequently.
2nd, positioning stamp signal generator module, the positioning stamp signal generator module include following submodule：
(1) high accuracy navigation time service module, can be the Big Dipper (GPS) single mode or bimodulus time service module, there is provided location information,
Time service information, and export to location information generation module.Time service module also produces pulse per second (PPS) trigger signal simultaneously, is connected to parasitism
Text generation module and location information generation module, the trigger signal as SECO；
(2) location information generation module, the location information provided time service module and time service information carry out framing processing；
(3) the filtered code word of pulse-shaping (Gold codes, Walsh codes are passed through in pseudorandom number generation module, storage generation
Or Constructing Chaotic Code)；
(4) band spectrum modulation module, location information generation module and pseudorandom number generation module are by caused data frame and code
Word exports to band spectrum modulation module and carries out XOR, completes band spectrum modulation.
3rd, the signal of intermediate frequency or radio frequency combining module, parasitic signal generation module and positioning stamp signal generator module generation is defeated
Go out to combining module and be combined processing, frequency-variable module, parasitism letter need to be also added before combining module in radio frequency combining in this way
Number generation module and the signal of positioning stamp signal generator module generation export to up-converter module and carry out up-conversion respectively first：
(1) up-converter module, combining module export multiplexed signals to up-converter module, the frequency of up-conversion to parasitic signal
Section, is exported to radiofrequency emitting module；
(2) radiofrequency emitting module, it is divided into two submodules of power amplifier and antenna, i.e. power amplifier module, to penetrating
Frequency signal carries out power amplification, exports to Anneta module；Anneta module, radiofrequency signal is launched by channel.
4th, Receiver Module, it is divided into two submodules of Anneta module and low-noise amplifier, i.e. Anneta module, receives letter
Signal on road, export to low noise amplifier module；Low noise amplifier module, power amplification is carried out to reception signal, it is defeated
Go out to down conversion module.
5th, down conversion module, radiofrequency signal is downconverted into intermediate frequency or zero intermediate frequency, exported to shunt (if information source end is
Down conversion module is then entered back into by shunt first in radio frequency combining).
6th, intermediate frequency or radio frequency shunt module, intermediate frequency (zero intermediate frequency) signal after down coversion or radiofrequency signal are divided into two
Road, export respectively to parasitic signal receiving module and positioning stamp signal Despread and demodulator.
7th, parasitic signal receiving module, it is divided into two submodules of modulus sampling module and parasitic signal demodulation module：
(1) modulus sampling module, modulus sampling is carried out to signal, exported to parasitic signal demodulation module；
(2), parasitic signal demodulation module, parasitic signal is demodulated, exported to back end processing module and SHL intelligence
Parasitic signal modulation module in Despread and demodulator.
8th, SHL intelligence Despread and demodulator, it is divided into modulus sampling module, memory module, parasitic modulation module, ambient noise
Remove five submodules of module and spread spectrum demodulation module：
(1) modulus sampling module, modulus sampling is carried out to signal, exported to memory module；
(2) memory module, modulus sampled data is kept in, exports to ambient noise and remove module；
(3) parasitic signal modulation module, generation parasitic signal is re-modulated according to the system of parasitic signal, is exported to background
Noise remove module；
(4) ambient noise removes module, by the data of data-conversion and memory module caused by parasitic signal modulation module
It is added, removes ambient noise, export to spread spectrum demodulation module；
(5) spread spectrum demodulation module, despread-and-demodulation is carried out to the signal after removal ambient noise, exports to rear module
Row further application processing.
The invention has the advantages that：
1. the present invention proposes the method that association navigator fix signal realizes pseudo range measurement and positioning on communication broadcast channel,
Pseudo-random code spread-spectrum technology is make use of, the situation of the navigator fix signal low-power parasitism of association is made up with spreading gain.Not
On the premise of influenceing by parasitic communication broadcast signal, it can be achieved with surveying pseudorange and positioning with the navigator fix signal of association.Pseudo-code
The navigator fix signal of the association of spread spectrum, there is disguised and anti-interference.
2. the signal background that intelligent despread-and-demodulation method can force down the mixed signal of the navigator fix signal containing association is made an uproar
Vocal level, when the navigator fix signal of association is colonized in communication broadcast channel, do not limited by the demodulation threshold under traditional concept
System, accomplish association to be demodulated navigator fix signal it is buried below communication broadcast signal background when, remain to realize solution reconcile
Code；Intelligent despread-and-demodulation method can make the navigator fix signal power level value of association very low, remain to normal transmission and demodulation.
Intelligent despread-and-demodulation method can also relax to by the requirement of parasitic communication channel bandwidth, thus the method for the invention can realize it is general
Suitableization, shown in table 1 specific as follows.
Table 1：Allow the parasitic level range of the navigator fix signal of association
3. the mode on the navigator fix signal parasitism of association to communication broadcast signal is divided into two kinds：One kind is given birth to signal
It is individually created the navigator fix signal of association into module, and the navigator fix signal modulation of association to same with communication broadcast signal
Launch in one frequency range, two homogenous frequency signals aliasing in space propagation synthesizes；Another kind is that two kinds of signals each modulate up-conversion
Afterwards in radio-frequency head synthesis mode, again through power amplification after synthesis, from antenna toward spatial emission.Above-mentioned synthetic method is wide to original communication
Broadcasting equipment and system need to only be improved on a small quantity, be operated with using very convenient.
4. the method for the invention and device can not only be used for outdoor positioning, the property of outdoor positioning system and terminal is improved
Can, improve positioning precision；Equally can be used for indoor positioning, meet the location navigation under complex environment indoors, so as to for
Realize that the positioning of indoor and outdoor seamless navigation provides feasible method and apparatus.
Brief description of the drawings
Fig. 1 is that the present invention realizes that the navigator fix signal of association is parasitic and SHL intelligence despread-and-demodulation method workflows are shown
It is intended to；
Fig. 2 is the navigator fix association multiplexed signals of band sharing of the present invention and can filter the intelligence solution of companion signal
Expand demodulating equipment structural representation；
Fig. 3 is high-precision GNSS of the present invention (Big Dipper or GPS) Timing Receiver composition schematic diagram；
Fig. 4 is ambient noise remover composition schematic diagram of the present invention；
Fig. 5 is extended frequency demodulator composition schematic diagram of the present invention；
Fig. 6 is CMMB broadcast singals frame structure schematic diagram of the present invention；
Fig. 7 is that spread-spectrum signal of the present invention forms structural representation；
Fig. 8 is that full frame of the present invention is superimposed spread-spectrum signal schematic diagram；
Fig. 9 is that correlation of the present invention and bottom are made an uproar comparison schematic diagram；
Figure 10 is that correlation of the present invention and bottom are made an uproar comparison schematic diagram；
Figure 11 is that correlation of the present invention and bottom are made an uproar comparison schematic diagram；
Figure 12 is that correlation of the present invention and bottom are made an uproar comparison schematic diagram；
Figure 13 is that correlation of the present invention and bottom are made an uproar comparison schematic diagram；
Figure 14 is that correlation of the present invention and bottom are made an uproar comparison schematic diagram；
Figure 15 is that correlation of the present invention and bottom are made an uproar comparison schematic diagram；
Figure 16 is that correlation of the present invention and bottom are made an uproar comparison schematic diagram.
Embodiment
The navigation association multiplexed signals and intelligence of band sharing of the present invention are introduced below in conjunction with Figure of description 1-16
The embodiment of despread-and-demodulation method and device.
Embodiment 1
Pervasive association navigator fix signal system embodiment based on CMMB broadcast singal systems：
For CMMB broadcast singal frame structure schematic diagrames as shown in fig. 6, pilot frame is 1 frame per second, every frame is divided into 40 time slots,
The duration of each time slot is 25ms, including the beacon message of frame head part and the OFDM symbol of business datum part 53.Its
In beacon signal structure subframe be also depicted in Fig. 6, it is identical with two sections that beacon signal structure subframe includes sender unit identification (TxID)
Synchronizing signal.
The association navigator fix signal structure of spread spectrum location information and spreading code as shown in fig. 7, be made up of.Location information bag
The three-dimensional location coordinates information and temporal information in source are included, information code is by spreading code band spectrum modulation generation positioning time service spread spectrum letter
Number.Wherein three-dimensional location coordinates information can be longitude, latitude, the elevation information under certain coordinate system, or arbitrarily make by oneself
Coordinate under adopted coordinate system.Coordinate information can be demarcated in advance, or survey high means by GPS, baroceptor and obtain in real time
Take.Temporal information includes UTC time, or gps time, clock correcting information etc..
Due to needing not to the parasitic positioning signal on the premise of normally receiving composition interference of CMMB broadcast singals, design
Full frame superposition parasitic method：The full frame Fold additon location spread-spectrum signal on broadcast singal frame structure, as shown in Fig. 8.Association is navigated
It is lower 20dB than CMMB signal to position spread spectrum signal level, but spreading code code length is that 511 Gold code spreading gains are 10*log10
(511)=27.08dB, it is ensured that spread-spectrum signal it is thick catch, essence is caught and trace demodulation.Through on probation in try net, experiment
Prove that companion signal can be captured, tracked, pseudorange value can be measured, for positioning.
As shown in figure 1, specific implementation step is as follows：
1st, CMMB texts are produced by the CMMB broadcast singals multiplexer in Fig. 2 and encoded.
2nd, OFDM modulation generation CMMB signals are carried out by the CMMB drivers in Fig. 2.
3rd, information source three is generated by having satellite navigation (Big Dipper or GPS) to tame the high-precision Timing Receiver of function in Fig. 2
Tie up location coordinate information and temporal information.Timing Receiver including high-precision GNSS (based on the Big Dipper or GPS) as shown in figure 3, award
When receiver, atomic clock module and clock correction correcting module.GNSS Timing Receivers provide coordinate information, Coordinated Universal Time(UTC) (UTC)
And pulse per second (PPS) (1PPS).Due to GNSS time services long-term stability preferably and short-term stability is poor, atomic clock module short-term stability
Preferably there is long term bias in degree, therefore take taming principle to be corrected atomic clock module, steady good with reference to GNSS time services length
With atomic clock module it is short steady good the advantages of, export high-precision 1PPS, be CMMB drivers and location information maker in Fig. 2
Unified time reference is provided.
4th, pseudo noise code is produced by the pseudorandom number generation device in Fig. 2.Pseudorandom number generation device is one group of hardware ROM, raw
Into code word (Gold codes, Walsh codes or Constructing Chaotic Code) be stored in after pulse-shaping filters in ROM, in code clock during use
Driving is lower to be read.
5th, location information and the NOR gate circuit of pseudo noise code in fig. 2 are done into XOR.
6th, BPSK modulation and DA conversion, generation positioning stamp signal are carried out by direct sequence synthesis (DDS) chip again.
7th, processing is combined by the combiner in Fig. 2 to two paths of signals, positioning stamp signal is in the form of parasitic signal
With CMMB Signal averagings.
8th, up-conversion is carried out by the upconverter in Fig. 2 to combining signal, is converted to radio frequency band.
9th, the power amplifier power amplification in Fig. 2 is passed through to radiofrequency signal again.
10th, launched by antenna.
In above step, high-precision Timing Receiver, CMMB broadcast singals multiplexer in the Fig. 2 being related to, CMMB
Modulator, DDS chips, combiner, upconverter, power amplifier and transmitting antenna are existing matured product, can directly be used.Positioning
Information generator, pseudorandom number generation device and NOR gate circuit can be generated by single-chip microcomputer, DSP and FPGA.
The method of the invention and its anti-interference degree analyzing of device：
The navigator fix spread-spectrum signal of association in full frame stacked system is continuous, then is advantageous to track, when being advantageous to carry out long
Between Integral Processing.The time that full frame stacked system can do correlation intergal computing is 250 times of segmented mode or so (25ms/100
μ s), spreading gain improves 10*log10 (250)=24dB.Full frame stacked system complexity is minimum.
Invention can be generally applicable to other communications and broadcast singal, and the level and power of parasitic signal should be according to original signals
The level and power condition of structure appropriately adjust.
Example 2
On the basis of transmitting terminal generates pervasive association navigator fix signal, receiving terminal is taken to be adapted with this signal system
SHL intelligence demodulation techniques carry out reception processing, as shown in figure 1, specific implementation step is as follows：
1st, the reception antenna reception signal in Fig. 2 is passed through；
2nd, signal is amplified by low noise sound intensifier；
3rd, it is transformed into intermediate-freuqncy signal after down coversion；
4th, intermediate-freuqncy signal is made to be divided into two-way by shunt；
5th, analog-to-digital conversion is carried out by modulus sampling A/D chip to two paths of signals；
6th, to being wherein demodulated all the way in a manner of normal OFDM；
7th, decoding output CMMB texts；
8th, denoising is carried out to another way by the ambient noise remover in Fig. 2, by being superimposed anti-phase CMMB signals
Mode remove CMMB signals, obtain parasitic signal.The composition of ambient noise remover as shown in figure 4, pass through buffer first
Signal after being sampled to modulus carries out temporary processing by regular hour length, and the text after being demodulated to CMMB is assisted according to CMMB
View re-starts OFDM modulation by CMMB drivers, to the signal after modulation by phase inverter inversion operation, such as：4 bits
It is 0101 to represent decimal number 5, is negated as -5, the complement of two's two's complement is expressed as 1011；4 bits represent that decimal number -4 is 1100,
Negate as 4, binary system 0100, carry out 180 degree phase bit flipping, generate anti-phase CMMB signals, then with etc. the AD of time span adopt
Sample keeps in signal and carries out sum operation by adder, and this is equivalent to be superimposed anti-phase CMMB signals so as to eliminate background
Noise, remaining parasitic positioning stamp signal；
9th, the positioning to parasitism stabs signal and carries out despreading demodulation processing by extended frequency demodulator in Fig. 2, obtains location information.
The composition of extended frequency demodulator slightly captures as shown in figure 5, carrying out code phase by matched filter first, makes initial code phase positions synchronous
Precision<1/2 chip.Smart tracking is carried out to the frequency and phase of carrier wave and code by carrier loop and code ring again, demodulated by code ring
The parasitic positioning stamp text of output；
10th, positioning stamp decoded message output.
In above step, the reception antenna, low-noise amplifier, low-converter, shunt, the modulus that are related in Fig. 2 are adopted
Sample chip is chosen as existing matured product, can be used directly.CMMB demodulators and CMMB drivers in Fig. 4 are also to be existing
Matured product, remainder can pass through FPGA hardware circuit realiration.The ripe Big Dipper/GPS may be selected in extended frequency demodulator in Fig. 5
Receiving module is realized based on FPGA and dsp chip.
Pervasive association navigator fix signal emulates with intelligent modulation demodulation techniques：
1. homologous generation single carrier communication signal and association navigator fix signal, and this two classes signal aliasing, after aliasing
Divide two-way decoded by the despread-and-demodulation of parasitic navigator fix signal again, can realize and parasitic signal is normally received.No
The disconnected level for reducing parasitic signal, when seeing last losing lock, spurious signal level is relative to by the size of spurious signal level.So as to
The critical level of parasitic signal despread-and-demodulation can be reflected.If communication broadcast signal is using modulated spread spectrum signal, modulation system
For BPSK, carrier frequency 20M；Association navigator fix signal use GPS C/A code signals, information data rate 50bps,
Spread-spectrum code rate is 1.023Mchip/s.
White Gaussian noise is added in mixed signal, makes signal to noise ratio E/NoFor 10dB.
(1) during association navigator fix signal 20dB lower than communication broadcast signal, mixed signal (signal of communication+positioning stamp letter
Number+noise) and to C/A codes related (referring to Fig. 9) is done, obtain the average value of ratio of auto-correlation peak-peak/maximum side petal about
For 10.5.
(2) during association navigator fix signal 30dB lower than communication broadcast signal, mixed signal (signal of communication+positioning stamp letter
Number+noise) and to C/A codes related (referring to Figure 10) is done, obtain the average value of ratio of auto-correlation peak-peak/maximum side petal about
For 5.9.
(3) during association navigator fix signal 40dB lower than communication broadcast signal, mixed signal (communication broadcast signal+association
Navigator fix signal+noise) to C/A codes related (referring to Figure 11) is done, obtain the ratio of auto-correlation peak-peak/maximum side petal
Average value be about 2.3.
(4) during association navigator fix signal 45dB lower than communication broadcast signal, mixed signal (communication broadcast signal+association
Navigator fix signal+noise) to C/A codes related (referring to Figure 12) is done, obtain the ratio of auto-correlation peak-peak/maximum side petal
Average value be about 1.2.Now peak value can not have been distinguished substantially with secondary lobe.
(5) in the case where above-mentioned steps can not be normally received, using intelligent demodulation techniques, parasitic signal is realized
Receive horizontal raising.After success, the power level of parasitic signal is gradually reduced, untill when can not be normally received.
Simulation result shown as association navigator fix signal 45dB lower than communications signal level, autocorrelation peak and maximum secondary lobe
It is worth almost equal, can not normally receives.Anti-phase communication or broadcast singal are added in mixed signal, be delayed 1/10 femtosecond
(fs), then related to C/A codes work, the signal distribution plots after obtained correlation are as follows：
During positioning stamp signal 45dB lower than communications signal level, mixed signal (signal of communication+positioning stamp signal+noise) with
C/A codes do related (referring to Figure 13), and the average value for obtaining the ratio of auto-correlation peak-peak/maximum side petal is about 1.75.
When association navigator fix signal is lower than signal of communication more, related peak-to-peak value can not have been distinguished substantially with secondary lobe.
2. white Gaussian noise is added in mixed signal, if signal to noise ratio E/NoFor 20dB：
(1) (it is not added with inversion signal) during association navigator fix signal 45dB lower than communication broadcast signal, mixed signal (communication
Signal+noise is stabbed in signal+positioning) related (referring to Figure 14) is done to C/A codes, obtain auto-correlation peak-peak/maximum side petal
The average value of ratio is about 1.5.
(2) (inversion signal is added) during association navigator fix signal 50dB lower than signal of communication, mixed signal (communication or broadcast
Signal+association navigator fix signal+noise) to C/A codes related (referring to Figure 15) is done, it is other to obtain auto-correlation peak-peak/maximum
The average value of the ratio of valve value is about 2.8.
(3) (inversion signal is added) during association navigator fix signal 55dB lower than communication broadcast signal, mixed signal (communication
Broadcast singal+association navigator fix signal+noise) to C/A codes related (referring to Figure 16) is done, obtain auto-correlation peak-peak/most
The average value of the ratio of big side lobe levels is about 1.8.
As a result:Signal to noise ratio E/NoFor 10dB when, intelligent demodulation ability can improve 5dB；Signal to noise ratio E/NoFor 20dB, intelligence solution
Tune ability can improve 10dB.
The invention is not restricted to above-mentioned embodiment, made any to above-mentioned embodiment aobvious of those skilled in the art and
The improvement or change being clear to, all without the design beyond the present invention and the protection domain of appended claims.
Claims (4)
1. a kind of intelligent despread-and-demodulation method of the navigation association multiplexed signals of band sharing, is comprised the following steps that：
Step 1: generating the navigation time service text by parasitic signal text and parasitism, high accuracy navigation Timing Receiver is utilized
Positioning and timing function, information source three-dimensional location coordinates information and temporal information are obtained, and framing processing generation positioning is carried out to it
Text is stabbed, the generation of above text is by the Coordinated Universal Time(UTC) and pulse per second (PPS) for Timing Receiver offer of navigating in high precision as time base
Standard, SECO is carried out by pulse per second (PPS)；
Step 2: to being modulated by parasitic signal text and parasitic navigation time service text, modulate to intermediate frequency or radio frequency band, will
Positioning stamp text and pseudorandom code word carry out XOR, complete band spectrum modulation, then enter line number by direct sequence synthesis chip
Modular transformation, generate intermediate frequency or radiofrequency signal；
Step 3: carrying out Power Control to parasitic signal, its power is set not influence by parasitic signal normal work；
Step 4: to being combined processing by parasitic signal and parasitic signal, the two is shared frequency range and channel, generate to be multiplexed
Pervasive association navigator fix signal existing for signal form；
Step 5: carrying out up-conversion to the multiplexed signals after combining, it is converted into by the radio frequency band of parasitic signal；
Step 6: being filtered to the multiplexed signals after up-conversion, power amplification, launched by antenna；
Step 7: receiving multiplexed signals by antenna, and it is amplified, filtering process；
Step 8: carrying out down coversion to amplification, filtered multiplexed signals, intermediate frequency or zero intermediate frequency are converted into；
Step 9: carrying out branch to the multiplexed signals after down coversion, and it is respectively processed；
Step 10: being demodulated all the way by by the signal system of parasitic signal to therein, text is demodulated；
Step 11: carrying out intelligent despread-and-demodulation to another way signal, the signal after being sampled first by buffer to modulus is pressed
Time span carries out temporary processing, and then the parasitic text demodulated is modulated according to parasitic signal system, and generation is parasitic
Signal, then the parasitic signal to regenerating carry out inversion operation by phase inverter, generate inversion signal：(1) inversion signal is made
With etc. the temporary signal of modulus sampling of time span pass through adder and carry out sum operation, equivalent to being superimposed anti-phase parasitic signal
So as to remove ambient noise, remaining parasitic positioning stamp signal, (2) carry out despreading solution to the positioning stamp signal for removing ambient noise
Adjust, obtain navigator fix information；
Step 12: what is normally demodulated each carries out corresponding further processing by parasitic signal and parasitic positioning stamp signal.
2. the intelligent despread-and-demodulation method of the navigation association multiplexed signals according to band sharing described in claim 1, its feature exist
In generation described in step 1 is by parasitic signal text and the navigation time service text of parasitism, including step：
2.1 are generated by parasitic signal text using existing ripe application apparatus, can be broadcast singal, ground cellular mobile communication
Signal or satellite communication signals,
2.2 using high accuracy navigation Timing Receivers positioning and timing function, obtain information source three-dimensional location coordinates information and when
Between information, and it is carried out framing processing generation positioning stamp text,
2.3 generation pseudorandom code words, select Gold codes, Walsh codes, chaos sequence or other kinds of spread spectrum code word,
The generation of above text by the Coordinated Universal Time(UTC) and pulse per second (PPS) for Timing Receiver offer of navigating in high precision as time reference,
SECO is carried out by pulse per second (PPS).
3. the intelligent despread-and-demodulation method of the navigation association multiplexed signals according to band sharing described in claim 1, its feature exist
In to being modulated by parasitic signal and parasitic signal described in step 2, modulating as follows to intermediate frequency or radio frequency band：
3.1 pairs are modulated by parasitic signal text, modulation system according to its original system signal system,
Positioning stamp text and pseudorandom code word are carried out XOR by 3.2, complete band spectrum modulation, then synthesize core by direct sequence
Piece carries out digital to analog conversion, generates intermediate frequency or radiofrequency signal.
A kind of 4. intelligent despread-and-demodulation device of the navigation association multiplexed signals of band sharing, it is characterised in that the intelligence despreading
Demodulating equipment with lower module by being formed：
1st, parasitic signal generation module, be broadcast singal driver, ground cellular mobile communication base band, satellite communication base band or its
His digital baseband, the parasitic signal generation module include following submodule：
(1) parasitic text generation module, generate digital information according to the frame format of parasitic signal and export to parasitic text and modulate
Module,
(2) parasitic text modulation module, digital to analog conversion is carried out according to the signal system of parasitic signal, is modulated to intermediate frequency or radio frequency；
2nd, positioning stamp signal generator module, the positioning stamp signal generator module include following submodule：High accuracy navigation time service
Module, location information generation module, pseudorandom number generation module and band spectrum modulation module；It is described high accuracy navigation time service module be
Big Dipper GPS single modes or bimodulus time service module, there is provided location information, time service information are simultaneously exported to location information generation module, described
Time service module also produces pulse per second (PPS) trigger signal simultaneously, is connected to parasitic text generation module and location information generation module, makees
For the trigger signal of SECO；The location information and time service information that the location information generation module is provided time service module are entered
The processing of row framing；The filtered code word of pulse-shaping is passed through in the storage generation of pseudorandom number generation module；Location information generation module
Caused data frame and code word are exported to band spectrum modulation module with pseudorandom number generation module and carry out XOR, completes spread spectrum
Modulation；
3rd, the signal output of intermediate frequency or radio frequency combining module, parasitic signal generation module and positioning stamp signal generator module generation is extremely
The combining module is combined processing, and frequency-variable module, parasitism letter need to be also added before combining module in radio frequency combining in this way
Number generation module and the signal of positioning stamp signal generator module generation export to up-converter module and carry out up-conversion respectively first：
(1) up-converter module, the combining module export multiplexed signals to up-converter module, the frequency of up-conversion to parasitic signal
Section, is exported to radiofrequency emitting module；(2) radiofrequency emitting module, it is divided into two sons of power amplifier module and Anneta module
Module, the power amplifier module, power amplification is carried out to radiofrequency signal, exported to Anneta module；The Anneta module, will
Radiofrequency signal is launched by channel；
4th, Receiver Module includes：Anneta module and low noise amplifier module, the Anneta module receive the letter on channel
Number, export to low noise amplifier module, the low noise amplifier module carries out power amplification to reception signal, exports under
Frequency-variable module；
5th, down conversion module, radiofrequency signal is downconverted into intermediate frequency or zero intermediate frequency, exported to shunt；
6th, intermediate frequency or radio frequency shunt module, intermediate-freuqncy signal or radiofrequency signal are divided into two-way, export to parasitic signal and receive respectively
Module and positioning stamp signal Despread and demodulator；
7th, parasitic signal receiving module includes：Modulus sampling module and parasitic signal demodulation module, wherein modulus sampling module pair
Signal carries out modulus sampling, exports to parasitic signal demodulation module, the parasitic signal demodulation module and parasitic signal is solved
Expand demodulation, export to the parasitic signal modulation module in back end processing module or intelligent Despread and demodulator；
8th, intelligent Despread and demodulator includes following submodule：Modulus sampling module, memory module, parasitic signal modulation module,
Ambient noise removes module and Despread and demodulator, and the modulus sampling module carries out modulus sampling, output to storage to signal
Module, the memory module keep in modulus sampled data, export to ambient noise and remove module, the parasitic signal modulation module
System according to parasitic signal re-modulates generation parasitic signal, exports to ambient noise and removes module, and the ambient noise is gone
Except data-conversion caused by parasitic signal modulation module is added by module with the data of memory module, ambient noise, output are removed
To Despread and demodulator, the Despread and demodulator, despread-and-demodulation is carried out to the signal after removal ambient noise, exported to rear
End module carries out further application processing.
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