CN107272026B - 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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- CN107272026B CN107272026B CN201710344840.3A CN201710344840A CN107272026B CN 107272026 B CN107272026 B CN 107272026B CN 201710344840 A CN201710344840 A CN 201710344840A CN 107272026 B CN107272026 B CN 107272026B
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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
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Abstract
A kind of navigation signal component phase test bias method, is sampled by the navigation signal that A/D sampler exports navigation signal occurrence of equipment, and sampler and navigation signal occurrence of equipment use the same frequency reference.The relevant treatment of sampled data is completed using nominal navigation signal centre frequency and reference arm pseudo noise code, it determines and corresponds to reference arm pseudo noise code starting point in sampled signal, since the starting point, it reads length and is the navigation signal data of 1 reference arm pseudo noise code length, and carry out carrier wave removing；Then, each branch navigation signal uses the local base band of pseudorandom number generation respectively, is mutually multiplied accumulating to the navigation signal after the removing of two-way carrier wave and phase identifies, obtain 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 methods.
Background technique
In order to provide high-precision the urban satellite navigation service, navigation 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, navigation satellite is being sent out
In ground test before penetrating, it is necessary to carry out Due Diligence to the navigation signal of navigation satellite, it is ensured that signal quality after satellite is in-orbit
It is able to satisfy the demand of user.
For traditional radiodigital carrier (boc) modulated signals, such as QPSK, BPSK, GSM, commercial vector letter is generallyd use
Number analysis instrument, or quality evaluation is carried out using the test macro 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 cannot
It is analyzed using general commercial Vector Signal Analysis or Vector Signal Analysis software.Currently, to the quality of navigation signal
Assessment is all made of high-speed sampling, then uses Digital Signal Processing assessment signal quality 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 processing, obtain with each branch navigation signal of frequency point carrier wave synchronization initial phase, with wherein all the way for reference,
Other each branch carrier wave initial phases seek difference with reference arm initial phase to obtain, and therefore, this project evaluation precision depends on
In the acquisition precision of each branch carrier wave first phase.
Acquisition for the phase of navigation signal, processing structure of traditional processing mode based on delay lock loop are 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, be theoretically constantly present certain tracking error, lead to local carrier and actual signal nominal center
There are difference on the frequencies for frequency, and this structure can only relatively accurately separate QPSK signal, for permanent envelope Multiple modulation mode
Modern navigation signal can not obtain the initial phase phase of each branch respectively.Paper " the matched navigation signal carrier wave of digital waveform
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
Phase acquisition is to carry out relevant matches by being locally generated the local digital Wave data of different first phases and sampled signal, every time
Matching, needs to carry out the big operation of once-through operation amount, in order to improve precision, needs more matching times, in addition, working as same frequency
When the signal branch number of point is more, the intermodulation component between each branch navigation signal impacts matched peak value, this
Method is to match data to be analyzed according to the digital waveform of local different initial phases, and intermodulation component leads to the abnormal of match peak
Become, the carrier phase error that as a result will lead to acquisition becomes larger.
Summary of the invention
Technology of the invention solves the problems, such as: having overcome the deficiencies of the prior art and provide a kind of navigation signal component phase
Test bias method realizes the essence of the signal component phase deviation of the same frequency point 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, steps are as follows:
(1) navigation signal that navigation signal generator generates is sampled with high-speed a/d sampler；
(2) using a branch in same frequency point multichannel navigation signal as reference signal, i.e., the road of the 1st navigation signal,
If the pseudo noise code period 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 WsThe local carrier cosine wave data W for being 0 with first phasec, wherein local carrier frequency is fl=fd；
(4) the reference arm pseudo noise code chip in a pseudo noise code period is generated as local pseudo noise code base band number
According to；If there are subcarriers for reference arm, subcarrier modulation is carried out to reference arm pseudo noise code, obtains local pseudo noise code base
Band data；According to sample rate fsGeneration time span is TcReference arm navigation signal local baseband sample dataSample
Data points are L=Tc×fs；
(5) by local sine and cosine data orthogonal reference branch navigation signal local baseband sample dataThen it carries out
Fourier transform, the Fourier transform with the preceding L data of navigation signal sampled data carry out conjugate multiplication, and another mistake Fourier becomes
It changes, a square processing is carried out to amplitude, find out maximum value, corresponding sample point serial 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 removingAnd WcIt is multiplied, the data after obtaining carrier wave removing
(7) the local baseband sample data of reference arm navigation signalRespectively withWithIt is multiplied and adds up, obtain
ASAnd AC, the initial phase of reference mass navigation signal carrier wave is calculated are as follows:
(8) the carrier wave initial phase for obtaining the 2nd navigation signal branch is calculated；
(9) other navigation signal branches of all same frequency points, using initial with the carrier wave of the 2nd navigation signal branch of calculating
The identical method of phase calculates respective carrier wave initial phase；
It (10) is reference, the carrier wave initial phase and reference branch of every other branch with the carrier wave initial phase of reference arm
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 frequency f in the step (1)sHigher than the highest of navigation satellite frequency point navigation signal to be tested
Twice of frequency or more.
The frequency reference of A/D sampler and navigation signal generator is believed using the same frequency reference in the step (1)
Number.
Local carrier sinusoidal wave data W in the step (3)sThe local carrier cosine wave data W for being 0 with first phasecAcquisition
Method are as follows:
The detailed process of the step (8) are as follows: assuming that its pseudo noise code period is T2, then a pseudo noise code period is generated
Pseudo noise code base band data obtain this if the navigation signal carries out subcarrier modulation there are subcarrier, to the pseudo noise code
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 branch2Less than or equal to reference arm pseudo noise code cycle Tc, then local baseband sample data length be L '=
T2×fs, read the data after preceding a carrier wave of L ' is removedWithIt uses respectivelyWithIndicate, local baseband sample data withWithIt is multiplied and adds up, obtain A 'SWith A 'C；Calculate the initial phase of the 2nd navigation signal carrier wave are as follows:
If the pseudo noise code cycle T of the 2nd road navigation signal branch2Greater than reference arm pseudo noise code cycle Tc, then local base band is intercepted
The preceding L of data data, with respectively withWithIt is multiplied and adds up, obtain ASAnd AC；Calculate the 2nd navigation signal carrier wave
Initial phase are as follows:
The advantages of the present invention over the prior art are that:
(1) reference signal of the sampling clock of A/D sampler and navigation signal generator uses same frequency benchmark, is believing
Number processing in local carrier frequency directly use nominal frequency value, completely eliminate the influence of frequency error.
(2) carrier wave first phase calculating in, it is only necessary to twice to sinusoidal carrier removing and cosine carrier removing after signal into
Row multiplication accumulating operation, so that it may carry out phase and identify to obtain carrier wave first phase, operand is small, it is only necessary to two reference arm puppets with
The data in machine period.
(3) this method is mutually multiplied accumulating using the data in a pseudo noise code period, eliminates other branch pseudo noise codes to institute
The influence for taking branch calculates carrier wave initial phase by arc tangent, forms friendship when avoiding the work of multiple branch circuit navigation signal
Adjust influence of the component to calculated result.
Detailed description of the invention
Fig. 1 is the method for the present invention realization principle figure；
The numeric field frequency spectrum of Fig. 2 navigation signal.
Specific embodiment
As shown in Figure 1, being the flow diagram of the method for the present invention.Key step is as follows:
(1) the navigation signal sampling generated with high-speed a/d sampler navigation signal generator, it is desirable that A/D sampler samples
Frequency fsHigher than twice of highest frequency or more of navigation satellite frequency point navigation signal to be tested；The clock of A/D sampler and navigation
The frequency reference of signal generator uses the 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 to frequency point navigation signal to be tested be
1575.42+16.368=1591.788MHz uses fs=5GHz sample rate, fsHigher than twice of highest frequency or more.Hits
It is as shown in Figure 2 according to power spectrum.
(2) using a branch in the multichannel navigation signal of same frequency point as reference signal, it is assumed that reference arm navigation letter
Number the pseudo noise code period be Tc, it is 2T that any time, which continuously extracts length,cNavigation signal sampled data, data amount check N=
2×Tc×fs.Assuming that Tc=1ms, then the navigation signal sampled data for sampling reading 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 WsThe local carrier cosine wave data W for being 0 with first phasec, wherein data sample point number L=Tc×fs,
Local carrier frequency value is the nominal center frequency of navigation signal；
(4) the reference arm pseudo noise code chip for generating a pseudo noise code period, 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 BPSK modulation, raw to its pseudo-noise code generator
It is L sample points according to BPSK modulation pseudo noise code base band data sample at pseudorandom number generation:
D in formulaB(i), i=1 ..., L modulate pseudo noise code base band data sample for BPSK.
It is modulated if it is BOC, firstly generates the subcarrier sample point that number is L:
Then add with pseudo noise code base band data sample mould 2, form BOC modulating baseband data.
In formula Indicate 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 data, and then the data after orthogonal modulation become:
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 carries out a square processing to amplitude:
FFT () indicates to carry out data in bracket Fourier transform in formula, and FFT* () indicates to carry out Fourier change to data
After changing and conjugation reason is carried out, IFFT () indicates 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 value, corresponding sample point serial number is then that reference arm is corresponded in navigation signal
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
The local sinusoidal data W for being 0 with first phasesIt is multiplied, the data after obtaining carrier wave removingIt is 0 with first phase
Local cosine data WcIt is multiplied, the data after obtaining carrier wave removing
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, obtain
ASAnd AC, calculate the initial phase of reference mass navigation signal carrier wave are as follows:
(8) the carrier wave initial phase for carrying out the 2nd navigation signal branch calculates.
Assuming that its pseudo noise code period is T2, then the pseudo noise code base band data in a pseudo noise code period is generated, if
There are subcarriers for the navigation signal, then continue to carry out subcarrier modulation to the pseudo noise code, 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
The code period is less than reference arm pseudo noise code cycle Tc, at this moment local baseband sample data length is L '=T2×fs, carrier wave removing
Data afterwardsWithL ' is a before reading, and uses respectivelyWithIndicate, local baseband sample data withWithIt is multiplied
And add up, obtain A 'SWith A 'C；Calculate the initial phase of the 2nd navigation signal carrier wave are as follows:
If the pseudo noise code period of the 2nd road navigation signal branch is greater than 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, obtain AS and AC；Calculate the 2nd navigation letter
The initial phase of number carrier wave are as follows:
(9) other navigation signal branches of all same frequency points calculate respective load using the identical method of (8) step
Wave initial phase.
It (10) is reference, the carrier wave initial phase and reference branch of every other branch with the carrier wave initial phase of reference arm
Road initial phase asks poor, asks the result of difference to subtract phase difference as defined in Navigation Signal System again, the final result is exactly to lead
The signal component phase component deviation of boat signal.
Assuming that the carrier phase difference for providing the 2nd bar navigation signal branch and reference arm in Navigation Signal System is pi/2, then
The signal component phase component deviation of 2nd bar navigation signal branch are as follows:
The content that description in the present invention is not described in detail belongs to the well-known technique of those skilled in the art.
Claims (4)
1. a kind of navigation signal component phase test bias method, it is characterised in that steps are as follows:
(1) navigation signal that navigation signal generator generates is sampled with A/D sampler；
(2) using a branch in same frequency point multichannel navigation signal as reference signal, i.e. the 1st navigation signal branch；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 that 0 local carries
Wave sinusoidal wave data WsThe local carrier cosine wave data W for being 0 with first phasec, wherein local carrier frequency is fl=fd；
(4) the reference arm pseudo noise code chip in a pseudo noise code period is generated as local pseudo noise code base band data；If
There are subcarriers for 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 TcReference arm navigation signal local baseband sample dataSample data
Points are L=Tc×fs；
(5) by local sine and cosine data orthogonal reference branch navigation signal local baseband sample dataThen Fourier is carried out
Leaf transformation, the Fourier transform with the preceding L data of navigation signal sampled data carry out conjugate multiplication, then inverse Fourier transform,
A square processing is carried out to amplitude, acquires maximum value, sample point serial number corresponding to maximum value 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 removingAnd WcIt is multiplied, the data after obtaining carrier wave removing
(7) the local baseband sample data of reference arm navigation signalRespectively withWithIt is multiplied and adds up, obtain ASWith
AC, the initial phase of reference arm navigation signal carrier wave is calculated are as follows:
(8) the carrier wave initial phase for obtaining the 2nd navigation signal branch is calculated；Detailed process are as follows: assuming that its pseudo noise code period
For T2, then the pseudo noise code base band data in a pseudo noise code period is generated, if there are subcarriers for the navigation signal, to the puppet
Random code carries out subcarrier modulation, obtains local pseudo noise code base band data；According to sample rate fsGenerate local pseudo noise code base
Band sample data；If the pseudo noise code cycle T of the 2nd navigation signal branch2Less than or equal to the reference arm pseudo noise code period
Tc, then local baseband sample data length is L '=T2×fs, read the data after preceding a carrier wave of L ' is removedWithIt uses respectivelyWithIndicate, local baseband sample data withWithIt is multiplied and adds up, obtain A 'SWith A 'C；Calculate the 2nd navigation signal
The initial phase of carrier wave are as follows:If the pseudo noise code cycle T of the 2nd road navigation signal branch2Greater than ginseng
Examine branch pseudo noise code cycle Tc, then intercept the data of the preceding L of local base band data, with respectively withWithIt is multiplied and tires out
Add, obtains ASAnd AC；Calculate the initial phase of the 2nd navigation signal carrier wave are as follows:
(9) other navigation signal branches of all same frequency points, using the carrier wave initial phase with the 2nd navigation signal branch of calculating
Identical method calculates respective carrier wave initial phase；
It (10) is to refer to the carrier wave initial phase of reference arm, at the beginning of the carrier wave initial phase and reference arm of every other branch
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 twice of highest frequency or more of navigation satellite frequency point 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: described
The frequency reference of A/D sampler and navigation signal generator uses the 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 insThe local carrier cosine wave data W for being 0 with first phasecAcquisition methods are as follows:
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| CN112305569B (en) * | 2020-09-30 | 2023-08-29 | 北京空间飞行器总体设计部 | Method for testing time domain waveform distortion degree of navigation signal |
| CN114690844A (en) * | 2020-12-29 | 2022-07-01 | 长沙北斗产业安全技术研究院有限公司 | Method and device for generating high-precision clock trigger signal |
| CN115657093B (en) * | 2022-12-29 | 2023-03-31 | 成都奇芯微电子有限公司 | Method based on captured data storage |
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