CN107272026A - A kind of navigation signal component phase test bias method - Google Patents
A kind of navigation signal component phase test bias method Download PDFInfo
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- CN107272026A CN107272026A CN201710344840.3A CN201710344840A CN107272026A CN 107272026 A CN107272026 A CN 107272026A CN 201710344840 A CN201710344840 A CN 201710344840A CN 107272026 A CN107272026 A CN 107272026A
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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
- G01S19/20—Integrity monitoring, fault detection or fault isolation of space segment
Abstract
A kind of navigation signal component phase test bias method, the navigation signal for navigation signal occurring equipment output by A/D samplers is sampled, and sampler occurs equipment with navigation signal and uses same frequency reference.The relevant treatment of sampled data is completed using nominal navigation signal centre frequency and reference arm pseudo noise code, determine correspondence reference arm pseudo noise code starting point in sampled signal, since the starting point, read length and be the navigation signal data of 1 reference arm pseudo noise code length, and carry out carrier wave stripping；Then, each branch road navigation signal uses the local base band of pseudorandom number generation respectively, and the navigation signal after being peeled off to two-way carrier wave is mutually multiplied accumulating and phase differentiates, obtains the carrier wave first phase of each signal branch；Finally obtain navigation signal component phase deviation.
Description
Technical field
The present invention relates to a kind of navigation signal component phase test bias method.
Background technology
In order to provide high-precision the urban satellite navigation service, aeronautical satellite must provide continuous, high-precision and high integrity
Navigation signal, the positioning of the quality influence satellite navigation system user of navigation signal, range performance, therefore, aeronautical satellite is in hair
In ground test before penetrating, it is necessary to carry out Due Diligence to the navigation signal of aeronautical satellite, it is ensured that the in-orbit rear signal quality of satellite
The demand of user can be met.
For traditional radiodigital carrier (boc) modulated signals, such as QPSK, BPSK, GSM, generally using commercial vector letter
Number analytical instrument, or quality evaluation is carried out using the test system combined based on all purpose instrument and Vector Signal Analysis software,
But, in modern satellite navigation signals system, often there is a signal for different modulating mode on same carrier frequency point, it is impossible to
Analyzed using general commercial Vector Signal Analysis or Vector Signal Analysis software.At present, to the quality of navigation signal
Assess and use high-speed sampling, Digital Signal Processing assessment signal quality then is used to the data after sampling.Navigation signal point
Amount phase deviation is the key project in navigation signal quality evaluation project.Navigation signal component phase deviation is by navigation
Signal transacting, obtains the carrier wave with each branch road navigation signal of frequency in the initial phase of synchronization, is to refer to all the way with wherein,
Other each branch road carrier wave initial phases seek difference to obtain with reference arm initial phase, therefore, and this project evaluation precision depends on
In the acquisition precision of each branch road carrier wave first phase.
For the acquisition of the phase of navigation signal, traditional processing structure of the processing mode based on delay lock loop is this
The signal duration required in mode is long, causes microwave sampled data huge, and in this structure, utilizes loop filter
Output tracking carrier wave, certain tracking error is constantly present in theory, causes local carrier and actual signal nominal center
There is difference on the frequency in frequency, and this structure can only relatively accurately separate QPSK signals, for permanent envelope Multiple modulation mode
Modern navigation signal, it is impossible to obtain the initial phase phase of each branch road respectively.Paper《The navigation signal carrier wave of digital waveform matching
Method for precisely synchronizing》(Liu Chonghua, Cui little Zhun, Wang Lu etc., China Measures Institute journal vol25 (4), p14~19,2014 years 12
Month) in propose a kind of method for calculating navigation signal initial phase, this method is in spite of higher estimated accuracy, but carrier wave
It is by being locally generated the local digital Wave data of different first phases and sampled signal progress relevant matches, every time that phase, which is obtained,
Matching is, it is necessary to carry out the big computing of once-through operation amount, in order to improve precision, it is necessary to more matching times, in addition, when same frequency
When the signal branch number of point is more, the intermodulation component between each branch road navigation signal is impacted to the peak value of matching, this
Method is to match data to be analyzed according to the digital waveform of local different initial phases, and intermodulation component causes the abnormal of match peak
Become, the carrier phase error obtained as a result can be caused to become big.
The content of the invention
The technology of the present invention solves problem：Overcoming the deficiencies in the prior art, there is provided a kind of navigation signal component phase
Test bias method, realizes the essence of the component of signal phase deviation of the same frequency multiple branch circuit navigation signal of navigation signal generator
Density test.
The technical scheme is that：A kind of navigation signal component phase test bias method, step is as follows：
(1) navigation signal generated with high-speed a/d sampler to navigation signal generator is sampled；
(2) using a branch road in same frequency multichannel navigation signal as the road of the navigation signal of reference signal, i.e., the 1st,
If the pseudo noise code cycle of reference arm navigation signal is Tc, it is 2T that any time, which continuously extracts length,cNavigation signal hits
According to；
(3) according to sample rate fsWith the nominal center frequency f of navigation signald, generation time span is Tc, first phase be 0 sheet
Ground carrier wave sinusoidal wave data WsWith the local carrier cosine wave data W that first phase is 0c, wherein local carrier frequency is fl=fd；
(4) generate the reference arm pseudo noise code chip in a pseudo noise code cycle and be used as local pseudo noise code base band number
According to；If reference arm has subcarrier, subcarrier modulation is carried out to reference arm pseudo noise code, local pseudo noise code base is obtained
Band data；According to sample rate fsGeneration time span is TcThe local baseband sample data of reference arm navigation signalSample
Data points are L=Tc×fs；
(5) by the local local baseband sample data of sine and cosine data orthogonal reference branch road navigation signalThen carry out
Fourier transform, conjugate multiplication is carried out with the Fourier transform of the preceding L data of navigation signal sampled data, and another mistake Fourier becomes
Change, a square processing is carried out to amplitude, maximum is obtained, its corresponding sample point sequence number is defined as rising for reference arm pseudo noise code
Initial point N0；
(6) from N0Start, the data that the sampled data intercepted length to reference signal is LWith WsIt is multiplied, obtains
Data after carrier wave strippingAnd WcIt is multiplied, obtains the data after carrier wave is peeled off
(7) the local baseband sample data of reference arm navigation signalRespectively withWithIt is multiplied and adds up, obtains AS
And AC, calculate and obtain the initial phase of reference mass navigation signal carrier wave and be：
(8) the carrier wave initial phase for obtaining the 2nd navigation signal branch road is calculated；
(9) other navigation signal branch roads of all same frequencies, it is initial using the carrier wave with calculating the 2nd navigation signal branch road
Phase identical method, calculates respective carrier wave initial phase；
(10) using the carrier wave initial phase of reference arm as reference, carrier wave initial phase and the reference branch of every other branch road
Road initial phase asks poor, seeks poor result phase difference as defined in subtraction signal system again, obtained result is exactly the letter of navigation signal
Number component phase component deviation.
A/D sampler samples frequencies f in the step (1)sHigher than the highest of aeronautical satellite frequency navigation signal to be tested
More than twice of frequency.
The frequency reference of A/D samplers and navigation signal generator is believed using same frequency reference in the step (1)
Number.
Local carrier sinusoidal wave data W in the step (3)sWith the local carrier cosine wave data W that first phase is 0cAcquisition
Method is：
The detailed process of the step (8) is：Assuming that its pseudo noise code cycle is T2, then a pseudo noise code cycle is generated
Pseudo noise code base band data, if the navigation signal has subcarrier, subcarrier modulation is carried out to the pseudo noise code, this is obtained
Ground pseudo noise code base band data；According to sample rate fsGenerate local pseudo noise code baseband sample data；If the 2nd navigation signal
The pseudo noise code cycle T of branch road2Less than or equal to reference arm pseudo noise code cycle Tc, then local baseband sample data length is L '
=T2×fs, the data after the individual carrier waves of L ' are peeled off before readingWithUse respectivelyWithRepresent, local baseband sample data
WithWithIt is multiplied and adds up, obtains A 'SWith A 'C；The initial phase for calculating the 2nd navigation signal carrier wave is：If the pseudo noise code cycle T of the 2nd road navigation signal branch road2More than the reference arm pseudo noise code cycle
Tc, then intercept the preceding L of local base band data data, with respectively withWithIt is multiplied and adds up, obtains ASAnd AC；Calculate the
The initial phase of 2 navigation signal carrier waves is：
The advantage of the present invention compared with prior art is：
(1) reference signal of the sampling clock of A/D samplers and navigation signal generator uses same frequency benchmark, in letter
Number processing in local carrier frequency directly use nominal frequency value, the influence of frequency error is completely eliminated.
(2) in the calculating of carrier wave first phase, it is only necessary to which the signal after being peeled off twice to sinusoidal carrier stripping and cosine carrier enters
Row multiplication accumulating operation, it is possible to enter line phase and differentiate to obtain carrier wave first phase, operand is small, it is only necessary to two reference arms it is pseudo- with
The data in machine cycle.
(3) this method is mutually multiplied accumulating using the data in a pseudo noise code cycle, eliminates other branch road pseudo noise codes to institute
The influence of branch road is taken, carrier wave initial phase is calculated by arc tangent, it is to avoid form friendship during the work of multiple branch circuit navigation signal
Adjust influence of the component to result of calculation.
Brief description of the drawings
Fig. 1 is the inventive method realization principle figure；
The numeric field frequency spectrum of Fig. 2 navigation signals.
Embodiment
As shown in figure 1, being the FB(flow block) of the inventive method.Key step is as follows：
(1) navigation signal generated with high-speed a/d sampler navigation signal generator is sampled, it is desirable to A/D sampler samples
Frequency fsHigher than more than twice of the highest frequency of aeronautical satellite frequency navigation signal to be tested；The clock of A/D samplers and navigation
The frequency reference of signal generator uses same reference frequency signal；Assuming that navigation signal centre frequency is fd=
1575.42MHz, navigation signal single-side belt bandwidth 16.368MHz, then the highest frequency for treating frequency navigation signal to be tested is
1575.42+16.368=1591.788MHz, uses fs=5GHz sample rates, fsHigher than more than twice of highest frequency.Hits
It is as shown in Figure 2 according to power spectrum.
(2) reference signal is used as using a branch road in the multichannel navigation signal of same frequency, it is assumed that reference arm navigation letter
Number the pseudo noise code cycle be Tc, it is 2T that any time, which continuously extracts length,cNavigation signal sampled data, data amount check is N=
2×Tc×fs.Assuming that Tc=1ms, then the navigation signal sampled data for reading of sampling is 1e7.
(3) according to sample rate fsWith the nominal center frequency f of navigation signald, generation time span is Tc, first phase be 0 sheet
Ground carrier wave sinusoidal wave data WsWith the local carrier cosine wave data W that first phase is 0c, wherein data sample counts out L=Tc×fs,
Local carrier frequency value is the nominal center frequency of navigation signal；
(4) the reference arm pseudo noise code chip in a pseudo noise code cycle is generated, if reference arm has subcarrier,
Subcarrier modulation also is carried out to pseudo noise code, according to sample rate fsGenerate the local baseband sample data of reference arm navigation signalData length is L=Tc×fs.Here L=5e6.If reference signal is modulated for BPSK, its pseudo-noise code generator is given birth to
It is that L sample points modulate pseudo noise code base band data sample according to BPSK into pseudorandom number generation：
D in formulaB(i), i=1 ..., L, are BPSK modulation pseudo noise code base band data samples.
If BOC modulation, then the subcarrier sample point that number is L is firstly generated：
Then add with pseudo noise code base band data sample mould 2, form BOC modulating baseband data.
In formula Represent mould 2 plus processing, i=1,2 ..., N
(5) the sine and cosine data of local carrier carry out multicarrier orthogonal modulation to local base band data.Assuming that local base band
Data are BOC modulation datas, and then the data after orthogonal modulation are changed into：
D in formulaM(k)=dR(k)(Wc(k)+jWs(k))。
Data after orthogonal modulation carry out Fourier transform, with the preceding L data of the N number of navigation signal sampled data of reading
Fourier transform carries out conjugate multiplication, then inverse Fourier transform, and a square processing is carried out to amplitude：
FFT () represents to carry out data in bracket Fourier transform in formula, and FFT* () represents to carry out Fourier change to data
Change rear and carry out conjugation reason, IFFT () represents to carry out inverse Fourier transform to data in bracket.To read N number of navigation letter
The preceding L data of number sampled data.
To square after amplitude search maximum, its corresponding sample point sequence number then be navigation signal in correspondence reference arm
The starting point N of pseudo noise code0。
(6) from N0Start, the data for being L from the sampled data intercepted length of navigation signal
With the local sinusoidal data W that first phase is 0sIt is multiplied, obtains the data after carrier wave is peeled offIt is 0 with first phase
Local cosine data WcIt is multiplied, obtains the data after carrier wave is peeled off
D in formulaS(k)=dd(k)×Wc(k), dC(k)=dd(k)×Ws(k)
(7) the local baseband sample data of reference arm navigation signalRespectively withWithIt is multiplied and adds up, obtains AS
And AC, calculate reference mass navigation signal carrier wave initial phase be：
(8) the carrier wave initial phase for carrying out the 2nd navigation signal branch road is calculated.
Assuming that its pseudo noise code cycle is T2, then the pseudo noise code base band data in a pseudo noise code cycle is generated, if
There is subcarrier in the navigation signal, then continue to carry out subcarrier modulation to the pseudo noise code, so as to obtain local pseudo noise code base
Band data.According to sample rate fsGenerate local pseudo noise code baseband sample data.If the pseudorandom of the 2nd navigation signal branch road
The code cycle is less than reference arm pseudo noise code cycle Tc, at this moment local baseband sample data length is L '=T2×fs, carrier wave stripping
Data afterwardsWithL ' is individual before reading, and uses respectivelyWithRepresent, local baseband sample data withWithIt is multiplied simultaneously
It is cumulative, obtain A 'SWith A 'C；The initial phase for calculating the 2nd navigation signal carrier wave is：
If the pseudo noise code cycle of the 2nd road navigation signal branch road is more than reference arm pseudo noise code cycle Tc, then intercept
The data of preceding L of local base band data, with respectively withWithIt is multiplied and adds up, obtains AS and AC；Calculate the 2nd navigation letter
The initial phase of number carrier wave is：
(9) other navigation signal branch roads of all same frequencies, using (8) step identical method, calculate respective carry
Ripple initial phase.
(10) using the carrier wave initial phase of reference arm as reference, carrier wave initial phase and the reference branch of every other branch road
Road initial phase asks poor, asks the result of difference to subtract phase difference as defined in Navigation Signal System again, the result finally obtained is exactly to lead
The component of signal phase component deviation of boat signal.
Assuming that the carrier phase difference that the 2nd bar navigation signal branch and reference arm are provided in Navigation Signal System is pi/2, then
The component of signal phase component deviation of 2nd bar navigation signal branch is：
The content not being described in detail in description of the invention belongs to the known technology of those skilled in the art.
Claims (5)
1. a kind of navigation signal component phase test bias method, it is characterised in that step is as follows：
(1) navigation signal generated with A/D samplers to navigation signal generator is sampled；
(2) road of the navigation signal of reference signal, i.e., the 1st is used as using a branch road in same frequency multichannel navigation signal；Arbitrarily
It is 2T that moment, which continuously extracts length,cNavigation signal sampled data；Wherein TcFor the pseudo noise code week of reference arm navigation signal
Phase；
(3) according to sample rate fsWith the nominal center frequency f of navigation signald, generation time span is Tc, first phase be 0 local load
Ripple sinusoidal wave data WsWith the local carrier cosine wave data W that first phase is 0c, wherein local carrier frequency is fl=fd；
(4) generate the reference arm pseudo noise code chip in a pseudo noise code cycle and be used as local pseudo noise code base band data；If
There is subcarrier in reference arm, then carry out subcarrier modulation to reference arm pseudo noise code, obtain local pseudo noise code base band number
According to；According to sample rate fsGeneration time span is TcThe local baseband sample data of reference arm navigation signalSample data
Count as L=Tc×fs；
(5) by the local local baseband sample data of sine and cosine data orthogonal reference branch road navigation signalThen Fourier is carried out
Leaf transformation, conjugate multiplication, then inverse Fourier transform are carried out with the Fourier transform of the preceding L data of navigation signal sampled data,
A square processing is carried out to amplitude, maximum is tried to achieve, the sample point sequence number corresponding to maximum is defined as reference arm pseudo noise code
Starting point N0；
(6) from N0Start, the data that the sampled data intercepted length to reference signal is LWith WsIt is multiplied, obtains carrier wave
Data after strippingAnd WcIt is multiplied, obtains the data after carrier wave is peeled off
(7) the local baseband sample data of reference arm navigation signalRespectively withWithIt is multiplied and adds up, obtains ASWith
AC, calculate and obtain the initial phase of reference mass navigation signal carrier wave and be：
(8) the carrier wave initial phase for obtaining the 2nd navigation signal branch road is calculated；
(9) other navigation signal branch roads of all same frequencies, using the carrier wave initial phase with calculating the 2nd navigation signal branch road
Identical method, calculates respective carrier wave initial phase；
(10) using the carrier wave initial phase of reference arm as reference, at the beginning of the carrier wave initial phase and reference arm of every other branch road
Beginning phase asks poor, seeks poor result phase difference as defined in subtraction signal system again, and obtained result is exactly the signal point of navigation signal
Measure phase component deviation.
2. a kind of navigation signal component phase test bias method according to claim 1, it is characterised in that：The step
(1) A/D sampler samples frequency f insHigher than more than twice of the highest frequency of aeronautical satellite frequency navigation signal to be tested.
3. a kind of navigation signal component phase test bias method according to claim 1 or 2, it is characterised in that：It is described
The frequency reference of A/D samplers and navigation signal generator uses same reference frequency signal in step (1).
4. a kind of navigation signal component phase test bias method according to claim 3, it is characterised in that：The step
(3) local carrier sinusoidal wave data W insWith the local carrier cosine wave data W that first phase is 0cAcquisition methods be：
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5. a kind of navigation signal component phase test bias method according to claim 1, it is characterised in that：The step
(8) detailed process is：Assuming that its pseudo noise code cycle is T2, then the pseudo noise code base band number in a pseudo noise code cycle is generated
According to, if there is subcarrier in the navigation signal, to the pseudo noise code carry out subcarrier modulation, obtain local pseudo noise code base band number
According to；According to sample rate fsGenerate local pseudo noise code baseband sample data；If the pseudo noise code week of the 2nd navigation signal branch road
Phase T2Less than or equal to reference arm pseudo noise code cycle Tc, then local baseband sample data length is L '=T2×fs, L ' before reading
Data after individual carrier wave strippingWithUse respectivelyWithRepresent, local baseband sample data withWithIt is multiplied and tires out
Plus, obtain A 'SWith A 'C；The initial phase for calculating the 2nd navigation signal carrier wave is：If the 2nd tunnel is navigated
The pseudo noise code cycle T of signal branch2More than reference arm pseudo noise code cycle Tc, then intercept the preceding L's of local base band data
Data, with respectively withWithIt is multiplied and adds up, obtains ASAnd AC；The initial phase for calculating the 2nd navigation signal carrier wave is：
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| CN112305569A (en) * | 2020-09-30 | 2021-02-02 | 北京空间飞行器总体设计部 | Method for testing time domain waveform distortion degree of navigation signal |
| CN115657093A (en) * | 2022-12-29 | 2023-01-31 | 成都奇芯微电子有限公司 | Method based on captured data storage |
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