CN106932792A - A kind of navigation signal simulator time-delay measuring method based on software receiver - Google Patents

A kind of navigation signal simulator time-delay measuring method based on software receiver Download PDF

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CN106932792A
CN106932792A CN201710196568.9A CN201710196568A CN106932792A CN 106932792 A CN106932792 A CN 106932792A CN 201710196568 A CN201710196568 A CN 201710196568A CN 106932792 A CN106932792 A CN 106932792A
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code
pseudo
navigation signal
signal
measuring method
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CN106932792B (en
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欧钢
马鹏程
唐小妹
林红磊
朱祥维
李垣陵
张勇虎
肖志斌
楼生强
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National University of Defense Technology
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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
    • G01S19/23—Testing, monitoring, correcting or calibrating of receiver elements

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  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)

Abstract

The invention discloses a kind of navigation signal simulator time-delay measuring method based on software receiver, comprise the following steps：First with the radiofrequency signal that high-speed oscilloscope collection navigation signal simulator is launched, the radiofrequency signal of this discretization is then down-converted into baseband signal using software receiver, the local pseudo-code of acquisition is demodulated to this baseband signal；The pseudo- code phase discriminator of non-coherent accumulation result input of baseband signal and local pseudo-code is finally iterated delay measurements in acquisition chip.The method can be to navigation simulator in the case of without hardware pseudo-code generation module delay measurements estimate, go for the latency measurement of all of BPSK navigation signal simulators.

Description

A kind of navigation signal simulator time-delay measuring method based on software receiver
Technical field
It is more particularly to a kind of based on soft the present invention relates to the signal simulator time-delay measuring method of technical field of satellite navigation The navigation signal simulator time-delay measuring method of part receiver.
Background technology
Navigation signal simulator can launch satellite navigation radio-frequency signal, can facilitate the test of user equipment, into It is one of important test equipment of navigation field.But, itself be present time delay in navigation signal simulator, set it has impact on to user Standby test performance.
Mainly there are oscillograph observation and receiver correlation method for the method for navigation signal simulator latency measurement at present. Oscillograph observation needs signal to noise ratio higher, it is impossible to the navigation signal that measurement is flooded by noise, can not measure without obvious Signal such as BOC and long period navigation signal of signal upset point etc.；Receiver correlation method needs pseudo-code generation module, but this It is inconvenient under certain situation especially non-public pseudo-code application conditions.
The content of the invention
For the deficiency of above-mentioned prior art, the invention provides a kind of navigation signal simulator based on software receiver Time-delay measuring method.
The technical scheme is that：
A kind of navigation signal simulator time-delay measuring method based on software receiver, comprises the following steps：
S1：The radio frequency navigation signal launched using high-speed oscilloscope collection navigation signal simulator, obtains penetrating for discretization Frequency navigation signal data；
S2：The radio frequency navigation signal data of this discretization is carried out into quadrature frequency conversion treatment, while estimating this navigation signal Doppler frequency shift and carrier wave initial phase, the signal of the Doppler frequency shift that obtains and carrier wave initial phase from down coversion will be estimated Middle stripping, the two-way digital orthogonal baseband signal for obtaining stripping Doppler frequency shift and carrier wave initial phase is respectively I tributary signals and Q branch Road signal；
S3：Pseudo- bit rate according to gathered radio frequency navigation signal is demodulated to the I tributary signals in S2, and demodulation is obtained This local code is distinguished lead and lag d (d≤0.5) individual chip by the pseudo-code sequence for obtaining as local pseudo-code, is obtained in advance originally Ground pseudo-code and delayed local pseudo-code；
S4：The two-way digital orthogonal baseband signal that S2 is obtained and advanced local pseudo-code and delayed local pseudo-code are as two The input of individual non-coherent accumulator, the input of one of non-coherent accumulator is two-way digital orthogonal baseband signal and advanced local puppet Code, the input of another non-coherent accumulator is two-way digital orthogonal baseband signal and delayed local pseudo-code；
S5：Each non-coherent accumulator carries out noncoherent accumulation to input signal and local pseudo-code, exports advanced non-respectively Coherent accumulation value E and delayed non-coherent accumulation value L；
S6：Using the advanced non-coherent accumulation value E and delayed non-coherent accumulation value L of S5 acquisitions as the defeated of pseudo- code phase discriminator Enter, pseudo- code phase discriminator carries out phase demodulation treatment to input value E and L, obtain pseudo-code phase demodulation value δ1；
S7：According to the pseudo-code phase demodulation value δ that S6 is obtained1Code phase to advanced local pseudo-code and delayed local pseudo-code enters simultaneously Row regulation, their code phase regulated quantity is-δ1；
S8：Continue to repeat S4 to S7, obtain multiple pseudo-code phase demodulation value, i ＆ lt phase demodulation value is δi, and record each phase demodulation value δi, make the identified result δ for obtaining next timei+10 is constantly reduced and leveled off to, works as δiLess than given threshold, (threshold value actually should Nanosecond order is generally less than in) when, iteration operation is exited, now local pseudo-code code phase τi+1As time delay in chip Measured value.
In step sl, the high-speed oscilloscope for being used can be adopted to the data that signal meet bandpass sample theory Sample；Need to enter row clock synchronization to high-speed oscilloscope and navigation signal simulator；Navigation signal mould is gathered using high-speed oscilloscope Can be divided into offline acquisition mode and online acquisition mode during the radiofrequency signal for intending device transmitting.
In step s 8, delay measurements refer to the collection starting point of radiofrequency signal to for the first time in the chip of the acquisition Time delay between the pseudo-code edge of appearance；Iteration threshold is the certainty of measurement value according to set by demand；Time delay in the chip Measured value estimated accuracy is up to magnitude of subnanosecond even more high.
Following technique effect can be reached using the present invention：
The present invention is directed to navigation signal simulator latency measurement problem, it is proposed that a kind of navigation letter based on software receiver Number simulator time-delay measuring method, first with the radiofrequency signal that high-speed oscilloscope collection navigation signal simulator is launched, then The radiofrequency signal of this discretization is down-converted into baseband signal using software receiver, acquisition is demodulated to this baseband signal originally Ground pseudo-code；The pseudo- code phase discriminator of non-coherent accumulation result input of baseband signal and local pseudo-code is finally iterated acquisition chip Interior delay measurements.This method can be to navigation simulator in the case of without hardware pseudo-code generation module time delay estimate Meter, goes for the latency measurement of all of BPSK navigation signal simulators, and its certainty of measurement is up to magnitude of subnanosecond；And Software receiver modification is convenient, using flexible, as long as increase pseudo-code generation module just can realize leading existing most of GNSS Boat signal simulator latency measurement.
Brief description of the drawings
Fig. 1 is overall procedure block diagram of the invention
Fig. 2 is flow chart of data processing figure of the invention.
The realization of the object of the invention, functional characteristics and advantage will be described further referring to the drawings in conjunction with the embodiments.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing to embodiment party of the present invention Formula is described in further detail.
Reference picture 1, is a kind of flow of the navigation signal simulator time-delay measuring method based on software receiver of the present invention Block diagram, comprises the following steps：
S1：The radio frequency navigation signal launched using high-speed oscilloscope collection navigation signal simulator, obtains penetrating for discretization Frequency navigation signal data；The data model can be expressed as：
Wherein, n is time series subscript, and D (n) is navigation message, and c (n) is spread-spectrum pseudo code, fcIt is carrier frequency, fdFor many General Le frequency displacement,It is carrier wave initial phase, w (n) is signal noise.
S2：The radio frequency navigation signal data of this discretization is carried out into quadrature frequency conversion treatment, two-way orthogonal basis is obtained and is taken a message Number Id(n) and QdN pretreatment module in (), such as Fig. 2, two-way digital orthogonal baseband signal can be expressed as：
Estimate the Doppler frequency shift and carrier wave initial phase of this navigation signal simultaneously, will estimate the Doppler frequency shift that obtains and Carrier wave initial phase is peeled off from the signal of down coversion, obtains the two-way orthogonal basis for peeling off Doppler frequency shift and carrier wave initial phase Band signal is respectively I tributary signals Ib(n) and Q tributary signals Qb(n)；
Ib(n)=D (n) c (n)+w (n) (4)
Qb(n)=w (n) (5)
S3：According to the pseudo- bit rate of gathered radio frequency navigation signal to the I tributary signals I in S2bN () is demodulated, such as Demodulation module in Fig. 2.The pseudo-code sequence for obtaining will be demodulated as local pseudo-code Pcode (n), Pc, its initial code phase positions in such as Fig. 2 It is τ0=0.And by this local pseudo-code Pcode (n) difference lead and lag d (d≤0.5) individual chip, obtain advanced local pseudo-code Ec and Lc in Ecode (n) and delayed local pseudo-code Lcode (n), such as Fig. 2, its code phase is respectively τ0- d and τ0+d。
S4：The two-way digital orthogonal baseband signal I that S2 is obtainedb(n) and Qb(n) and advanced local pseudo-code Ecode (n) and stagnant Afterwards local pseudo-code Lcode (n) respectively as two inputs of non-coherent accumulator, the input of one of non-coherent accumulator is Two-way digital orthogonal baseband signal and advanced local pseudo-code, the input of another non-coherent accumulator are two-way digital orthogonal baseband signal and stagnant Local pseudo-code afterwards.
S5：Each non-coherent accumulator carries out noncoherent accumulation to input signal and local pseudo-code, exports advanced non-respectively Coherent accumulation value E and delayed non-coherent accumulation value L；Its calculating process is：
Advanced non-coherent accumulation value E：
Wherein, Ncoh is coherent accumulation number of times；
Delayed non-coherent accumulation value L：
S6：Using the advanced non-coherent accumulation value E and delayed non-coherent accumulation value L of S5 acquisitions as pseudo- code phase discriminator (such as Fig. 2 In DLL phase discriminators) input, pseudo- code phase discriminator carries out phase demodulation treatment to input value E and L, obtains pseudo-code phase demodulation value δ1；
Wherein i=1,2,3,4...... (8)
S7：According to the pseudo-code phase demodulation value δ that S6 is obtained1Code phase to advanced local pseudo-code and delayed local pseudo-code enters simultaneously Row regulation, their code phase regulated quantity is-δ1；
S8：Continue to repeat S4 to S7, obtain multiple pseudo-code phase demodulation value, i ＆ lt pseudo-code phase demodulation value is δi, and record mirror every time Phase value δi, make the identified result δ for obtaining next timei+10 is constantly reduced and leveled off to, works as δiDuring less than given threshold, repetition is exited Iterative operation, now local pseudo-code code phase τi+1As delay measurements in chip.
In step sl, the high-speed oscilloscope for being used can be adopted to the data that signal meet bandpass sample theory Sample；Need to enter row clock synchronization to high-speed oscilloscope and navigation signal simulator；Navigation signal mould is gathered using high-speed oscilloscope Can be divided into offline acquisition mode and online acquisition mode during the radiofrequency signal for intending device transmitting；
In step s 8, delay measurements refer to the collection starting point of radiofrequency signal to for the first time in the chip of the acquisition Time delay between the pseudo-code edge of appearance；Iteration threshold is the certainty of measurement value according to set by demand；Time delay in the chip Measured value estimated accuracy is up to magnitude of subnanosecond even more high.
The above is only the preferred embodiment of the present invention, and protection scope of the present invention is not limited to above-mentioned implementation Example, all technical schemes belonged under thinking of the present invention belong to protection scope of the present invention.It should be pointed out that for the art Those of ordinary skill for, some improvements and modifications without departing from the principles of the present invention, these improvements and modifications Should be regarded as protection scope of the present invention.

Claims (10)

1. a kind of navigation signal simulator time-delay measuring method based on software receiver, it is characterised in that comprise the following steps：
S1：The radio frequency navigation signal launched using high-speed oscilloscope collection navigation signal simulator, the radio frequency for obtaining discretization is led Boat signal data；
S2：The radio frequency navigation signal data of this discretization is carried out into quadrature frequency conversion treatment, while estimating many of this navigation signal General to strangle frequency displacement and carrier wave initial phase, the Doppler frequency shift and carrier wave initial phase that estimation is obtained are shelled from the signal of down coversion From the two-way digital orthogonal baseband signal for obtaining stripping Doppler frequency shift and carrier wave initial phase is respectively I tributary signals and Q branch roads letter Number；
S3：Pseudo- bit rate according to gathered radio frequency navigation signal is demodulated to the I tributary signals in S2, will demodulate what is obtained This local code is distinguished d chip of lead and lag by pseudo-code sequence as local pseudo-code, obtains advanced locally pseudo-code and delayed Local pseudo-code；
S4：The two-way digital orthogonal baseband signal and advanced locally pseudo-code and delayed local pseudo-code that S2 is obtained are non-as two The input of coherent accumulator, the input of one of non-coherent accumulator is two-way digital orthogonal baseband signal and advanced local pseudo-code, The input of another non-coherent accumulator is two-way digital orthogonal baseband signal and delayed local pseudo-code；
S5：Each non-coherent accumulator carries out noncoherent accumulation to input signal and local pseudo-code, exports advanced incoherent respectively Accumulated value E and delayed non-coherent accumulation value L；
S6：Advanced non-coherent accumulation value E that S5 is obtained and delayed non-coherent accumulation value L as pseudo- code phase discriminator input, it is pseudo- Code phase discriminator carries out phase demodulation treatment to input value E and L, obtains pseudo-code phase demodulation value δ1；
S7：According to the pseudo-code phase demodulation value δ that S6 is obtained1Code phase to advanced local pseudo-code and delayed local pseudo-code is adjusted simultaneously Section, their code phase regulated quantity is-δ1；
S8：Continue to repeat S4 to S7, obtain multiple pseudo-code phase demodulation value, i ＆ lt phase demodulation value is δi, and record each phase demodulation value δi, make The identified result δ for obtaining next timei+10 is constantly reduced and leveled off to, works as δiDuring less than given threshold, iteration operation is exited, Now local pseudo-code code phase τi+1As delay measurements in chip.
2. the navigation signal simulator time-delay measuring method based on software receiver according to claim 1, its feature exists In, in step S3, d≤0.5.
3. the navigation signal simulator time-delay measuring method based on software receiver according to claim 2, its feature exists In in step S1, the high-speed oscilloscope for being used to signal can meet the data sampling of bandpass sample theory.
4. the navigation signal simulator time-delay measuring method based on software receiver according to claim 3, its feature exists In, in step S1, the clock synchronization of high-speed oscilloscope and navigation signal simulator.
5. the navigation signal simulator time-delay measuring method based on software receiver according to claim 4, its feature exists In, in step S1, high-speed oscilloscope collection navigation signal simulator transmitting radio frequency navigation signal be offline acquisition mode or Online acquisition mode.
6. the navigation signal simulator time delay based on software receiver according to any claim in claim 1 to 5 Measuring method, it is characterised in that in step S1, the radio frequency navigation signal data of the discretization for being obtained, its data model is represented For：
Wherein, n is time series subscript, and D (n) is navigation message, and c (n) is spread-spectrum pseudo code, fcIt is carrier frequency, fdFor Doppler frequently Move,It is carrier wave initial phase, w (n) is signal noise.
7. the navigation signal simulator time-delay measuring method based on software receiver according to claim 6, its feature exists In, in step S2, the I tributary signals and Q that the radio frequency navigation signal data of discretization obtained after quadrature frequency conversion treatment Tributary signal is expressed as：
In step S2, the stripping Doppler frequency shift of acquisition and the two-way digital orthogonal baseband signal of carrier wave initial phase are expressed as：
Ib(n)=D (n) c (n)+w (n) (4)
Qb(n)=w (n) (5).
8. the navigation signal simulator time-delay measuring method based on software receiver according to claim 7, its feature exists In, in step S5, advanced non-coherent accumulation value E：
E = ( Σ n N c o h I b ( n ) × E c o d e ( n ) ) 2 + ( Σ n N c o h Q b ( n ) × E c o d e ( n ) ) 2 - - - ( 6 )
Wherein, Ncoh is coherent accumulation number of times；
Delayed non-coherent accumulation value L：
L = ( Σ n N c o h I b ( n ) × L c o d e ( n ) ) 2 + ( Σ n N c o h Q b ( n ) × L c o d e ( n ) ) 2 - - - ( 7 )
9. the navigation signal simulator time-delay measuring method based on software receiver according to claim 8, its feature exists In in step S8, i ＆ lt pseudo-code phase demodulation value is δiObtained by following formula：
10. the navigation signal simulator time-delay measuring method based on software receiver according to claim 8, its feature exists In in step S8, the threshold value of setting is less than nanosecond order.
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CN115150012A (en) * 2022-07-07 2022-10-04 中国人民解放军国防科技大学 Ionized layer channel high-precision dispersion time delay characteristic real-time simulation method and system

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