CN105334521B - The circuit of code division range accuracy is improved under the conditions of multi-user - Google Patents
The circuit of code division range accuracy is improved under the conditions of multi-user Download PDFInfo
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- CN105334521B CN105334521B CN201510679426.9A CN201510679426A CN105334521B CN 105334521 B CN105334521 B CN 105334521B CN 201510679426 A CN201510679426 A CN 201510679426A CN 105334521 B CN105334521 B CN 105334521B
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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
- 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
- G01S19/21—Interference related issues ; Issues related to cross-correlation, spoofing or other methods of denial of service
Abstract
The circuit of code division range accuracy is improved under the conditions of a kind of multi-user proposed by the present invention, can be to solve the problem of range error is drifted about, the technical scheme is that, jamming target carrier wave passes through frequency converter, despread device demodulates the input as interference cancellation module to jamming target information all the way, another road is demodulated by jamming target receiver to jamming target pseudo-code tracing, the local pseudo-code of obtained jamming target sends into jamming target regenerated baseband module together with demodulating information, the delay brought by the fixed post-compensation jamming target information of Postponement module 1 demodulation, then the regeneration of jamming target baseband signal is completed together with demodulating information；Enter adjustable delay module with delay correction module, delay correction module adjusts the retardation of adjustable delay module, and compare associated processing outcomes after each adjustment, travel through search maximal correlation output after each retardation and obtain optimal delay amount, operation result passes through interference cancellation module and exports the baseband signal after interference is eliminated.
Description
Technical field
The present invention proposes a kind of method that utilization cancellation techniques improve range accuracy under the conditions of code division multi-user, relates generally to
The application field related to CDMA ranging etc..
Background technology
In the range-measurement system being made up of range finder and answering machine, range finder launches ranging pseudo-code to answering machine, answering machine
Pseudo-code to reception is captured and tracked, and completes to receive the regeneration of clock, response pseudo-code is launched to ranging with the clock of regeneration
Machine, pseudo-code of the range finder equally to reception is captured and tracked, and is carried out by launching pseudo-code frame with receiving the time difference of pseudo-code frame
Ranging.Conventional distance-finding method has impulse method ranging and ranging phase method.Impulse method ranging transmitting pulse power is high, operating distance
But precision is relatively low, far, remote ranging, topographic survey and big gun radar tracker ranging etc. are generally used for；The precision of ranging phase method
It is higher than impulse method, it is used extensively in geodesic survey, engineering survey.No matter which kind of method is used, it is poor all to there is anti-interference,
Measurement distance is limited, and precision is low, the shortcomings of signal is easily trapped.Due to good CDMA communication ability and good communication
The characteristics such as confidentiality, are widely used in military affairs/commercial communication and remote measurement, positioning field.With satellite earth observation
The raising of resolution accuracy, the requirement of satellite positioning precision also more and more higher, current satellite ranging itself uses short cycle PN-code,
Range accuracy can be guaranteed in the single-user mode, but signaled not only under one side satellite and have distance measuring signal to also have to be used for
Other signals of data transfer, these signals also use short cycle PN-code, while also there are multiple satellites is in ground receiver together
In the range of scene, these situations all can receive signal in introduce code division multiple user signals.
Global positioning system carries out pseudo range measurement using ranging code, and without using other means (such as impulse method), this is
Because pseudorange is determined with ranging code has following advantage：
1) it is easy to extract faint satellite-signal.The transmission power of satellite-signal is limited, it is easy to done by some
Disturb signal (such as TV station, cellular radio, microwave relay station etc.) to cover, the intensity of satellite-signal typically only has these noises
The a ten thousandth of signal intensity is lower.Unique texture only according to pseudorange code, could extract satellite-signal from noise
Out；
2) range accuracy can be improved.The Pseudo-range Observations that relevant treatment obtained are carried out with ranging code can be considered as with integration
The result measured, is then averaged the average obtained afterwards, its precision is obviously higher than by the other ranging of each code division in interval
The precision of impulse method ranging；
3) it is easy to that satellite-signal is identified and handled with CDMA.When receiver receives signal, satellite letter
Number can together with noise enter each passage.But receiver defines No. PRN of institute's observation satellite in each passage, therefore
Respective channel only produces the replica code of corresponding satellite, and (at a time t satellites send a certain structure under the control of satellite clock
Ranging code, at the same time receiver then produced under the control of receiver clock and copy completely identical in structure ranging in other words
Code, abbreviation replica code), and the ranging code of other satellites and noise can be considered mutually orthogonal with the replica code, the shadow of coefficient correlation
Sound goes to zero.Other satellite-signals and noise separation can thus be gone out.Therefore each passage is allowed all to produce and need to see
The satellite identical ranging code of survey, just can carry out pseudorange observation respectively, so as to conveniently realize to n satellite in visual field simultaneously
Identification and processing to satellite-signal；
4) it is easy to that system is controlled and managed.After ranging code, U.S. Department of Defense can be by disclosing certain code
Structure or certain yard of structure is maintained secrecy to be controlled by user using the degree of the system.
For the consideration of hardware compatibility, the distance measuring signal of CDMA system is used ground pseudo satellite, pseudolite more.Multiple access between signal
Interference is to influence one of factor of pseudo satellite, pseudolite range accuracy, and larger ranging influence can be particularly produced under near-far interference, is real
Existing high accuracy positioning, need to reduce the ranging influence that multi-access inference is brought, generally be carried out using CDMA (CDMA) range-measurement system
Automatic range is addressed, addressing amount is up to 4096 addresses.Compared to data demodulation, range-measurement system is easier to be disturbed by multi-user,
Due to the short period code that range-measurement system is used, the code cross correlation between user is stronger, and this influence can be more serious, and this interference exists
Range accuracy can be ignored when requiring relatively low, but when applied to precision distance measurement system, this interference can turn into
Main interference, interference is embodied in two aspects, when being on the one hand that interference user movement speed is suitable with ranging user movement speed,
There is a larger error in measurement distance, and error is slowly slided with the time with actual range, and we term it range error
Drift；When being on the one hand that interference user has larger movement velocity difference with ranging user, measurement distance is superimposed on actual range
One random error, this phenomenon can cause the variance of range error to become big, and range accuracy declines.
The content of the invention
It is an object of the invention to solve above-mentioned technical problem, propose it is a kind of it is effective, reliable and stable, can eliminate many
User disturbs, it is easy to accomplish the circuit of code division range accuracy is improved under the conditions of multi-user, to solve the problem of range error is drifted about.
Present invention tool solves the technical scheme that is used of technical problem：Code division ranging essence is improved under the conditions of a kind of multi-user
The circuit of degree, including frequency converter, despreader and interference cancellation module, it is characterised in that jamming target carrier wave passes through frequency converter, one
The despread device in road is demodulated to jamming target information, and using demodulating information as the input of interference cancellation module, another road passes through interference
Intended receivers are demodulated to jamming target pseudo-code tracing, obtain the local pseudo-code of jamming target, local pseudo-code passes through Postponement module 1
Jamming target regenerated baseband module is sent into together with demodulating information, by the fixed post-compensation jamming target information of Postponement module 1
The delay brought is demodulated, the regeneration of jamming target baseband signal is then completed together with demodulating information；Enter with delay correction module
Enter adjustable delay module, delay correction module adjusts the retardation of adjustable delay module, and compares related place after each adjustment
Result is managed, search maximal correlation output after each retardation is traveled through and obtains optimal delay amount, in working condition, measuring distance of target connects
Receipts machine is tracked to the carrier phase of measuring distance of target and measuring distance of target signal is entered by the use of the carrier signal of tracking as local oscillator
Measuring distance of target baseband signal is obtained after the relevant frequency conversion of row as the input of interference cancellation module, delay correction module fixes output most
Good retardation as adjustable delay module retardation；The measuring distance of target carrier wave of signal input enters through another road frequency converter to postpone
Signal feeding related process module after module 2, fixed delay carries out relevant treatment, the relevant treatment of related process module output
As a result, weight is eliminated as interference by normalized module, the associated processing outcomes that relevant treatment is exported is multiplied by coefficient
X；The regenerated baseband signal of jamming target " carries out multiplication operation, Ran Houyu after Postponement module 3 " by fixed delay with weighted value
Through fixed delay, " signal after Postponement module 4 " carries out interference and eliminates computing measuring distance of target baseband signal, and operation result passes through dry
Disturb and offset the baseband signal after module output interference is eliminated.
The present invention has the advantages that compared to prior art：
The present invention uses cancellation techniques, goes out to disturb with demodulation information regeneration using the local pseudo-code that user's demodulation is obtained is disturbed
User's baseband signal, real time weight, exploitation right are solved using the baseband signal of regeneration is related to the progress of ranging user baseband signal
Regenerated signal is weighted with the user's interference component eliminated in ranging user's baseband signal again, can be effectively improved in code
Divide range accuracy under the conditions of multi-user, especially in the case where range accuracy requires higher, this effect is especially apparent.
The present invention by the interference user of regeneration it is base band signal weighted after eliminate interference user to the interference of ranging user
Mode improves ranging user range accuracy, solve ranging user due to caused by multi-user interference range accuracy decline, away from
From error drift problem；This method is simple in construction, is realized beneficial to miniaturization.
Simply, stably, reliably, beneficial to realization.The present invention utilizes the local pseudo-code for disturbing user to be obtained after demodulating and demodulation
Information carries out interference user baseband waveform reconstruct, and the weights calculated using weight method are entered to interference user's baseband waveform of reconstruct
Row weighting, the baseband waveform regenerated using the interference user of weighting is obtained after eliminating the interference signal in ranging user's baseband waveform
Ranging user's baseband waveform after offseting.
Have the advantages that stability is high, real-time.The present invention calculates weight using real-time mode, by the interference of reconstruct
It is related in real time to the progress of ranging user baseband signal after the progress delay adjustment of user's baseband waveform, calculated and offseted using correlated results
Weight, can make this method adapt to high dynamic user, and adapt to interference subscribers carrier and ranging subscribers carrier by means of which
High speed relative phase rotates caused by frequency difference.Each user is due to by other users under the conditions of code division multi-user can effectively be solved
Interference and occur ranging zero drift, precise decreasing the problems such as.
The present invention deducts weight calculation delay by the way of delay alignment, it is ensured that the weights used when being offseted
Validity.
Brief description of the drawings
This patent is further illustrated with reference to the accompanying drawings and examples.
Fig. 1 is the circuit theory schematic diagram of raising code division range accuracy under the conditions of multi-user of the present invention.
Fig. 2 is the influence for disturbing user to ranging user's pseudo-code tracing S phase demodulation curves.
Embodiment
Refering to Fig. 1.In embodiment described below, the circuit of code division range accuracy is improved under the conditions of multi-user, including
Frequency converter, despreader and interference cancellation module, wherein, jamming target carrier wave is by frequency converter, and despread device is to interference mesh all the way
Information demodulation is marked, using demodulating information as the input (0,1 represents) of interference cancellation module, another road passes through jamming target receiver
Jamming target pseudo-code tracing is demodulated, the local pseudo-code (0,1 represents) of jamming target is obtained, local pseudo-code passes through Postponement module 1
Jamming target regenerated baseband module is sent into together with demodulating information, by the fixed post-compensation jamming target information of Postponement module 1
The delay brought is demodulated, the regeneration of jamming target baseband signal is then completed together with demodulating information；Enter with delay correction module
Enter adjustable delay module, delay correction module adjusts the retardation of adjustable delay module, and compares related place after each adjustment
Result is managed, search maximal correlation output after each retardation is traveled through and obtains optimal delay amount, in working condition, measuring distance of target connects
Receipts machine is tracked to the carrier phase of measuring distance of target and measuring distance of target signal is entered by the use of the carrier signal of tracking as local oscillator
Measuring distance of target baseband signal is obtained after the relevant frequency conversion of row as the input of interference cancellation module, delay correction module fixes output most
Good retardation as adjustable delay module retardation；The measuring distance of target carrier wave of signal input enters through another road frequency converter to postpone
Signal feeding related process module after module 2, fixed delay carries out relevant treatment, the relevant treatment of related process module output
As a result, weight is eliminated as interference by normalized module, the associated processing outcomes that relevant treatment is exported is multiplied by coefficient
X；The regenerated baseband signal of jamming target " carries out multiplication operation, Ran Houyu after Postponement module 3 " by fixed delay with weighted value
Through fixed delay, " signal after Postponement module 4 " carries out interference and eliminates computing measuring distance of target baseband signal, and operation result passes through dry
Disturb and offset the baseband signal after module output interference is eliminated.
Delay correction module carries out delay disposal to the local pseudo-code of jamming target, and retardation is 1 jamming target information
Pseudo-code after chip width, delay disposal carries out jamming target baseband signal (0,1 table together with the demodulating information of jamming target
Show) reconstruct, specific reconstructing method, which is delay correction module, to carry out XOR processing by pseudo-code and information and obtains, the interference mesh of reconstruct
Mark baseband signal passes through related process module and the base of measuring distance of target after the delay disposal of adjustable delay module time delay variable
Band signal carries out relevant treatment, the method for particularly relevant processing be related process module first the interference signal of reconstruct is converted to-
1st, 1 signal represented, wherein 0 is converted to 1,1 and is converted to -1, phase is carried out by the baseband signal of the signal after conversion and measuring distance of target
Multiplication, carries out asking absolute value to calculate, is obtained after being integrated calculating to the result that absolute value is calculated to the operation result of multiplication
Related operation is exported；Delay correction module is corrected using associated processing outcomes to the delayer of time delay variable, specific practice
It is the retardation for changing delayer, regard corresponding retardation during related operation output result maximum as correction result.Postpone school
The weight that interference is eliminated is calculated using associated processing outcomes after the completion of holotype block correction, specific practice is related process module output
Associated processing outcomes after normalized module normalized as interference eliminate weight, the specific mistake of normalized
Cheng Shi：The associated processing outcomes that relevant treatment is exported are multiplied by coefficient X and obtain normalized result X=2/ (B × G), wherein,
B is the peak-to-peak value (p-p) of jamming target regenerated baseband signal, and G is associated processing gain；The regenerated baseband signal warp of jamming target
Crossing fixed delay, " delay 3 " carries out multiplication operation with weighted value afterwards, then with measuring distance of target baseband signal through fixed delay " delay
Signal after 4 " carries out interference and eliminates computing, and interference eliminates computing specific implementation and is：Measuring distance of target baseband signal, which is subtracted, to be added
The jamming target regenerated baseband signal of power is obtained, the baseband signal after the output interference elimination of interference cancellation module.
Refering to Fig. 2.Transverse axis is under the phase deviation of local pseudo-code and input signal pseudo-code, noiseless situation (solid line is represented)
Phase discriminator is output as zero when the phase deviation of local pseudo-code and input signal pseudo-code is zero, can accurately estimate defeated using this characteristic
Enter the phase of signal pseudo-code to reach the purpose of ranging.When (dotted line is represented) local pseudo-code and input signal under noisy condition
Phase discriminator output is not zero when the phase deviation of pseudo-code is zero, and has partially in the phase of some local pseudo-code and input signal pseudo-code
Phase discriminator is output as zero when poor, so the pseudo-code phase of input signal accurately can not be estimated, so as to ranging deviation occur.
Claims (7)
1. the circuit of code division range accuracy is improved under the conditions of a kind of multi-user, including：Jamming target receiver, reception jamming target
Frequency converter, despreader, measuring distance of target receiver, another road frequency converter and interference cancellation mould for receiving measuring distance of target carrier wave of carrier wave
Block, wherein, interference cancellation module includes：The Postponement module 1 of despreader is electrically connected, the Postponement module 2 of frequency converter is electrically connected, through prolonging
Related process module and Postponement module 3 that slow module 1 is electrically connected by jamming target regenerated baseband module, adjustable delay module,
Side connects the delay correction module of adjustable delay module, the input connection delay module 4 of Postponement module 2, and delayed module 2 and led to
Cross the normalized module of above-mentioned related process module electrical connection, it is characterised in that jamming target carrier wave passes through frequency converter, one
The despread device in road is demodulated to jamming target information, and using demodulating information as the input of interference cancellation module, another road passes through interference
Intended receivers are demodulated to jamming target pseudo-code tracing, obtain the local pseudo-code of jamming target, local pseudo-code passes through Postponement module 1
Jamming target regenerated baseband module is sent into together with demodulating information, by the fixed post-compensation jamming target information of Postponement module 1
The delay brought is demodulated, the regeneration of jamming target baseband signal is then completed together with demodulating information；Enter with delay correction module
Enter adjustable delay module, delay correction module adjusts the retardation of adjustable delay module, and compares related place after each adjustment
Result is managed, search maximal correlation output after each retardation is traveled through and obtains optimal delay amount, in working condition, measuring distance of target connects
Receipts machine is tracked to the carrier phase of measuring distance of target and measuring distance of target signal is entered by the use of the carrier signal of tracking as local oscillator
Measuring distance of target baseband signal is obtained after the relevant frequency conversion of row as the input of interference cancellation module, delay correction module fixes output most
Good retardation as adjustable delay module retardation；The measuring distance of target carrier wave of signal input enters through another road frequency converter to postpone
Signal feeding related process module after module 2, fixed delay carries out relevant treatment, the relevant treatment of related process module output
As a result, weight is eliminated as interference by normalized module, the associated processing outcomes that relevant treatment is exported is multiplied by coefficient
X；The regenerated baseband signal of jamming target carries out multiplication operation after fixed delay Postponement module 3 with weighted value, then with survey
Signal away from target baseband signal after fixed delay Postponement module 4 carries out interference and eliminates computing, and operation result passes through interference pair
Baseband signal after the module that disappears output interference elimination.
2. the circuit of code division range accuracy is improved under the conditions of the multi-user as described in claim 1, it is characterised in that：Delay correction
Module carries out delay disposal to the local pseudo-code of jamming target, and retardation is 1 jamming target information chip width, delay disposal
Pseudo-code afterwards carries out the reconstruct of jamming target baseband signal together with the demodulating information of jamming target.
3. the circuit of code division range accuracy is improved under the conditions of the multi-user as described in claim 2, it is characterised in that：Delay correction
Pseudo-code and information are carried out XOR processing and obtained by module, and the jamming target baseband signal of reconstruct can by adjustable delay module time delay
Relevant treatment is carried out by related process module and the baseband signal of measuring distance of target after the delay disposal of change.
4. the circuit of code division range accuracy is improved under the conditions of the multi-user as described in claim 3, it is characterised in that：Relevant treatment
Module is first converted to the interference signal of reconstruct the signal of -1,1 expression, wherein 0 is converted to 1,1 and is converted to -1, after conversion
The baseband signal of signal and measuring distance of target carries out multiplication operation, the operation result of multiplication is carried out asking absolute value to calculate, to absolute
The result that value is calculated, which is integrated after calculating, obtains related operation output.
5. the circuit of code division range accuracy is improved under the conditions of the multi-user as described in claim 4, it is characterised in that：Delay correction
Module is corrected using associated processing outcomes to the delayer of adjustable delay module, changes the retardation of delayer, by correlation
Corresponding retardation is used as correction result when computing output result is maximum.
6. the circuit of code division range accuracy is improved under the conditions of the multi-user as described in claim 5, it is characterised in that：Delay correction
After the completion of module correction the weight that interference is eliminated, the relevant treatment knot of related process module output are calculated using associated processing outcomes
Fruit eliminates weight after normalized module normalized as interference, and the associated processing outcomes that relevant treatment is exported are multiplied
Normalized result X=2/ (B × G) is obtained with coefficient X, wherein, B is the peak-to-peak value of jamming target regenerated baseband signal（p-
p）, G is associated processing gain.
7. the circuit of code division range accuracy is improved under the conditions of the multi-user as described in claim 1, it is characterised in that：Jamming target
Regenerated baseband signal after fixed delay Postponement module 3 with weighted value carry out multiplication operation, then with measuring distance of target base band
Signal of the signal after fixed delay Postponement module 4 carries out interference and eliminates computing, and interference eliminates computing specific implementation and is：Survey
The jamming target regenerated baseband signal for subtracting weighting away from target baseband signal is obtained, after the output interference of interference cancellation module is eliminated
Baseband signal.
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| CN109088655B (en) * | 2018-09-21 | 2019-11-19 | 浙江大学 | Interference cancellation band spread receiver for multichannel spread spectrum ranging |
| JP7258706B2 (en) * | 2019-09-19 | 2023-04-17 | 株式会社東芝 | Ranging device and ranging system |
| CN112187338B (en) * | 2020-09-17 | 2022-06-07 | 中国电子科技集团公司第三十八研究所 | Two-stage processing interference cancellation system and method for asynchronous CDMA system |
| CN114567341B (en) * | 2022-01-12 | 2023-05-23 | 中国电子科技集团公司第十研究所 | Multimode high-sensitivity high-speed signal receiving circuit |
| CN114785454A (en) * | 2022-03-31 | 2022-07-22 | 国网北京市电力公司 | Signal processing system and processing method |
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