CN105785402B - A kind of system and method for GNSS signal simulator time-delay calibration - Google Patents
A kind of system and method for GNSS signal simulator time-delay calibration Download PDFInfo
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Abstract
The present invention discloses a kind of system and method for GNSS signal hardware simulator time-delay calibration, which includes isolated amplifier, and external timing signal is divided into the first clock signal and second clock signal；Satellite navigation signal simulator, using the first clock signal as work clock, output radio frequency navigation signal and pps pulse per second signal in the case where receiver is stationary state and normal state simulation scene that simulator pseudorange changes over time；Data acquisition module, using second clock signal as sampling clock, for acquiring radio frequency navigation signal and pps pulse per second signal；Signal processing module, based on collected radio frequency navigation signal and pps pulse per second signal, the pseudorange for emulating moment epoch simulator record at the pseudorange corresponding to the radio frequency navigation signal and the pps pulse per second signal rising edge is calculated, obtains the self time-delay of satellite navigation signal simulator.Technical solution of the present invention is not required to the special screne of zero pseudorange of setting or fixed pseudorange, in the case where simulator normal state simulation scene signals export, you can calibrated to simulator time delay.
Description
Technical field
The present invention relates to a kind of time delay calibrating methods.It being used for GNSS signal simulator time delay school more particularly, to one kind
Accurate system and method.
Background technology
Global Satellite Navigation System (GNSS, Global Navigation Satellite System) is defended using navigation
The round-the-clock radio navigation system that star is established has obtained widely in fields such as Mapping remote sensing technology, time service and navigator fixs
Using.GNSS signal simulator (hereinafter referred to as simulator) is a kind of high-precision standard signal source, and it is practical can to simulate generation
Navigation satellite emits and is reached through spatial the navigation signal of navigation neceiver in environment, and signal simulation field is provided for receiver
Scape is the key that test equipment in receiver R & D design.By simulating different signal simulation scenes, simulator can dock
The different performance index of receipts machine carries out test and verification.
As the standard signal source of test receiver, the calibration of simulator inherent parameters index is particularly significant.When simulator
It is one of most important parameter of simulator to prolong.Calibration to simulator time delay, current existing method are exported based on simulator
Then the distinctive signal simulating scenes that pseudorange is zero are judged by high-speed oscilloscope eye-observation or signal acquisition and post-processing
Delay inequality between the pulse per second (PPS) rising edge and signal pseudo-code initial code phase positions of simulator, then deduct the time delay shadow of cable and connector
After sound, you can obtain the calibration value of simulator time delay.But in the test of receiver indices test especially receiver time delay
In calibration, the distinctive signal simulating scenes that not pseudorange is zero of simulator output, but export pseudorange and change over time just
The consistency of regular signal simulating scenes, both scene Imitating device time delays can not ensure；In addition, being observed by high-speed oscilloscope
Judge that the method for time delay between pulse per second (PPS) rising edge and pseudo-code initial code phase positions can also introduce subjective reading error, it cannot be guaranteed that school
The normalization of quasi- operation.
Accordingly, it is desirable to provide a kind of system and method for GNSS signal simulator time-delay calibration, it is pseudo- to be not required to setting zero
Away from special screne, ensure that the consistency of signal simulation scene used in simulator time-delay calibration and receiver index test, and
And calibration resolving power can be made to reach within 1ns, which is primarily limited to the sample rate and its data of apparatus for acquiring and storing
Storage capacity.
Invention content
The purpose of the present invention is to provide a kind of system and method in satellite navigation signals hardware simulator time-delay calibration,
Solve the problems, such as that needing to be arranged zero pseudorange special screne when being calibrated at present exists, in the feelings of simulator normal state simulation output
Under condition, simulator time delay can both be calibrated, and calibration resolving power can be made to reach within 1ns.
In order to achieve the above objectives, the present invention uses following technical proposals：
A kind of system for GNSS signal simulator time-delay calibration, which includes satellite navigation signal simulator sum number
According to acquisition module, the described system further comprises isolated amplifier, signal processing module；
External timing signal is divided into the first clock signal and second clock signal by the isolated amplifier；
The satellite navigation signal simulator, the first clock signal of self-isolation in future amplifier as work clock,
Receiver is to export to penetrate under the normal signal simulating scenes that stationary state and satellite navigation signal simulator pseudorange change over time
Frequency navigation signal and pps pulse per second signal；
The data acquisition module, the second clock signal of self-isolation in future amplifier is as sampling clock, for acquiring
Radio frequency navigation signal from satellite navigation signal simulator and pps pulse per second signal；
The signal processing module is based on collected radio frequency navigation signal and pps pulse per second signal, and described penetrate is calculated
The pseudorange that moment epoch simulator record is emulated at pseudorange and the pps pulse per second signal rising edge corresponding to frequency navigation signal, obtains
To the self time-delay of satellite navigation signal simulator.
Preferably, the signal processing module includes
Pps pulse per second signal leading edge position determination unit and
Navigation signal acquisition and tracking unit；
The pps pulse per second signal leading edge position determination unit is used to determine the sampling corresponding to pps pulse per second signal rising edge
Point；
The navigation signal acquisition and tracking unit is used to determine the carrier frequency and initial code phase of the radio frequency navigation signal
Simultaneously the tracking to signal is unfolded according to the information in position information.
Preferably, the signal processing module further comprises
Week count and week in second determination unit and
Track loop solving unit；
The week counts and second determination unit in week, the week for obtaining radio frequency navigation signal at pps pulse per second signal rising edge
Second in counting and being all, and then obtain the pseudorange of emulation moment epoch simulator record；
Pps pulse per second signal as receiver clock and is calculated pps pulse per second signal rising by the track loop solving unit
The pseudorange of the radio frequency navigation signal at subtracts emulation moment epoch at the pps pulse per second signal rising edge based on the pseudorange
Simulator record pseudorange, then divided by the light velocity to get to without cable and the modified simulator time delay value of connector time delay.
Preferably, described
Data acquisition module acquires the radio frequency navigation signal by the first cable and the second cable respectively and pulse per second (PPS) is believed
Number；
The signal processing module is further described without cable and the modified simulator time delay value of connector time delay according to evidence
The time delay value for subtracting the time delay value and the second cable of first cable, obtains the time delay value of satellite navigation signal simulator.
Preferably, the described system further comprises vector signal source, when for receiving second from isolated amplifier
Clock signal is simultaneously delivered to data acquisition module as work clock, frequency signal of the output not less than 1GHz.
Preferably, the described system further comprises atomic clock, for providing external timing signal.
Preferably, the data acquisition module need to acquire respectively no less than 40s the satellite navigation signal simulator it is defeated
The radio frequency navigation signal and pps pulse per second signal gone out.
A method of it being used for GNSS signal simulator time-delay calibration, described this method to include
Same external timing signal is respectively supplied to satellite navigation signal simulator and data acquisition module；
Satellite navigation signal simulator using the external timing signal as work clock, receiver be stationary state and
Radio frequency navigation signal and pulse per second (PPS) are exported under the normal signal simulating scenes that satellite navigation signal simulator pseudorange changes over time
Signal；
Data acquisition module is using the external timing signal as sampling clock, for acquiring satellite navigation signals mould simultaneously
The radio frequency navigation signal and pps pulse per second signal of quasi- device output；
Based on collected radio frequency navigation signal and pps pulse per second signal, the corresponding sampled point of pps pulse per second signal rising edge is determined
Tracking with the carrier frequency and initial code phase positions information for determining radio frequency navigation signal and according to information expansion to signal；
The pseudorange of the radio frequency navigation signal and emulation moment epoch at the pps pulse per second signal rising edge is calculated, into
And the pseudorange of emulation moment epoch simulator record is obtained, obtain the self time-delay of satellite navigation signal simulator.
Preferably, described this method further comprises
Week count and week in the second determine algorithm, for obtain at pps pulse per second signal rising edge week count and week in the second, into
And obtain the pseudorange of emulation moment epoch simulator record；
Tracking algorithm as receiver clock and calculates pps pulse per second signal described at pps pulse per second signal rising edge
The pseudorange of radio frequency navigation signal is subtracted based on the pseudorange and emulates moment epoch simulator record at pps pulse per second signal rising edge
Pseudorange, then divided by the light velocity to get to without cable and the modified simulator time delay value of connector time delay.
Preferably, described this method further comprises
Data acquisition module acquires the radio frequency navigation signal by the first cable and the second cable respectively and pulse per second (PPS) is believed
Number；
According to the time delay value for subtracting first cable without cable and the modified simulator time delay value of connector time delay
With the time delay value of the second cable, the time delay value of satellite navigation signal simulator is obtained.
Beneficial effects of the present invention are as follows：
Technical solution advantage of the present invention is：The special screne of zero pseudorange need not be arranged in calibration by the present invention,
In the case where simulator normal state simulation exports, the radio frequency navigation signal of simulator output and benchmark second pulse signal are passed through double
Channel high speed acquisition storage device is acquired, the satellite navigation signals of acquisition, by capture and track algorithm, in track loop
Into after locking, moment epoch is exported using collected pulse per second (PPS) rising edge as the pseudorange of loop, records and preserves loop solution
The pseudorange of calculating compares the pseudorange that the pseudorange that loop calculates is calculated with simulator mathematics simulation system, right between the two
The time difference answered, then remove the time delay of the introducings such as cable and connector, the as time delay value of simulator itself.
Description of the drawings
Specific embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.
Fig. 1 shows a kind of schematic device for GNSS signal simulator time-delay calibration in the embodiment of the present invention；
Fig. 2 shows processing acquisition letters in a kind of device for GNSS signal simulator time-delay calibration in the embodiment of the present invention
Number schematic diagram；
Fig. 3 shows a kind of method flow diagram for GNSS signal simulator time-delay calibration in the embodiment of the present invention.
Specific implementation mode
In order to illustrate more clearly of the present invention, the present invention is done further with reference to preferred embodiments and drawings
It is bright.Similar component is indicated with identical reference numeral in attached drawing.It will be appreciated by those skilled in the art that institute is specific below
The content of description is illustrative and be not restrictive, and should not be limited the scope of the invention with this.
As shown in Figure 1, the invention discloses a kind of system for GNSS signal simulator time-delay calibration, which includes
Atomic clock 1, isolation distribution amplifier 2, vector signal source 3, data acquisition equipment 4, satellite navigation signal simulator 5, cable A6,
Cable B7 and computer 8.
Atomic clock 1 provides external timing signal for the system, and external timing signal is divided into first by isolation distribution amplifier 2
Road clock signal and the second tunnel clock signal；When the first via of satellite navigation signal simulator self-isolation in 5 future distribution amplifier 2
Clock signal as work clock, receiver be stationary state and satellite navigation signal simulator pseudorange change over time it is normal
Radio frequency navigation signal and pps pulse per second signal are exported under signal simulation scene；Vector signal source 3, which receives, carrys out self-isolation distribution amplifier 2
The second tunnel clock signal as work clock, frequency sampling signal of the output not less than 1GHz is simultaneously delivered to data acquisition equipment
4；Data acquisition equipment 4 using the sampled signal not less than 1GHz from vector signal source 3 as sampling clock, and leads to respectively
Cross cable A6 and cable B7 acquisition radio frequency navigation signals and pps pulse per second signal；As shown in Fig. 2, the computer 8 includes determining the second
The pps pulse per second signal leading edge position determination unit of sampled point corresponding to pulse signal rising edge and the determining radio frequency navigation
The carrier frequency and initial code phase positions information of signal and the navigation signal acquisition and tracking that the tracking to signal is unfolded according to the information
Unit, the computer 8 further comprises counting in week and second determination unit and track loop solving unit in week, the week count
With second determination unit in week, the week that navigation signal at pps pulse per second signal rising edge is calculated counts and the second in week, and then obtains
The pseudorange of emulation moment epoch simulator record, the track loop solving unit, using pps pulse per second signal as when receiver
Clock and the pseudorange for calculating the radio frequency navigation signal at pps pulse per second signal rising edge subtract the pulse per second (PPS) based on the pseudorange
At signal rising edge emulate moment epoch simulator record pseudorange, then divided by the light velocity to get to without cable and connector time delay
Modified simulator time delay value.
Local atomic clock 1 separates two-way 10MHz frequency signals by the way that distribution amplifier 2 is isolated, as external reference clock,
Signal is input to satellite navigation signal simulator 5 all the way, replaces simulator internal clocking as work clock, another way signal is defeated
Enter the generation sampling clock of vector signal source 3 and be input to data acquisition equipment 4, it is therefore an objective to entire calibration system be made to be operated in unification
Under high stable frequency standard, eliminates the measurement that accuracy and stability difference due to each measuring apparatus Nei Shiji are brought and miss
Difference, while eliminating 4 inside phaselocked loop of Usage data collection equipment and generating the error that sampling clock introduces.Satellite navigation signals are simulated
Device 5 exports radio frequency navigation signal all the way and all the way pps pulse per second signal, and radio frequency navigation signal is exported to data by cable A6 and acquired
The acquisition channel all the way of equipment 4, pps pulse per second signal are delivered to the another way acquisition channel of data acquisition equipment 4 by cable B7,
Two paths of signals acquires simultaneously；The two paths of signals data of acquisition give computer 8 and carry out resolving processing, obtain without cable and connector
The modified simulator time delay value of time delay.Also the delay error of cable A6 and cable B7 are corrected when data processing, cable
A6 and cable B7 length of delays can shift to an earlier date to be measured by vector network analyzer.Finally, the influence of cable and connector delay is deducted,
The time-delay calibration value of satellite navigation signal simulator itself is obtained.
As shown in figure 3, above-mentioned apparatus is based on, the present invention discloses one kind for satellite navigation signals hardware simulator again when
Prolong the method for calibration, this method includes
S1, same external timing signal is respectively supplied to satellite navigation signal simulator and data acquisition module；
S2, satellite navigation signal simulator are static shape in receiver using the external timing signal as work clock
Under the normal signal simulating scenes that state and satellite navigation signal simulator pseudorange change over time, radio frequency navigation signal and second are exported
Pulse signal；
S3, data acquisition module are using the external timing signal as sampling clock, for acquiring satellite navigation letter simultaneously
The radio frequency navigation signal and pps pulse per second signal of number simulator output；
S4, it is based on collected radio frequency navigation signal and pps pulse per second signal, determines that pps pulse per second signal rising edge is corresponding and adopts
Simultaneously the tracking to signal is unfolded according to the information in the carrier frequency and initial code phase positions information of sampling point and determining radio frequency navigation signal；
S5, the week being calculated at pps pulse per second signal rising edge counts and the second in week, and then obtains emulation moment epoch
The pseudorange and as receiver clock and calculate pps pulse per second signal on pps pulse per second signal that simulator mathematics simulation system records
The pseudorange for rising the radio frequency navigation signal at subtracts the corresponding emulation in pps pulse per second signal rising edge place based on the pseudorange and goes through
The pseudorange divided by the light velocity of simulator record corresponding to first moment, then subtract the time delay of the time delay value and cable B of the cable A
Value is to get to the self time-delay of satellite navigation signal simulator
Embodiment of the present invention is described further in conjunction with above-mentioned apparatus and method：
The first step accesses unified external frequency standard for all devices.
The 10MHz signals that external atomic clock 1 is exported are divided by the way that distribution amplifier 2 is isolated for two-way：It is input to and defends all the way
Star navigation signal simulator 5 replaces simulator internal clocking as work clock；It is input to vector signal source 3 all the way, and is arranged
Frequency signal of the vector signal source output not less than 1GHz, inputs to data acquisition equipment 4, as sampling clock.Make be entirely
System is operated under unified high stable frequency standard, can eliminate the accuracy due to each measuring apparatus Nei Shiji and stability
The measurement error that difference is brought；Sampling clock is generated by using vector signal source 3, Usage data collection equipment 4 can be eliminated
Internal phaselocked loop generates the error that sampling clock introduces, and the above operation can ensure the high-precision and high accuracy of calibration result.
Second step, the simulating scenes setting of simulator.
In order to ensure simulator time delay in the case of two kinds of 5 time-delay calibration of satellite navigation signal simulator and receiver test
Consistency, the simulating scenes when signal simulation scene and receiver test of simulator should be arranged are consistent：I.e. by receiver
It is set as stationary state, satellite navigation signal simulator 5 exports the signal simulation scene under normal constellation dynamic, simultaneously closes off star
Error, star clock error, ionosphere, troposphere and multipath equal error item are gone through, and makes each of simulator mathematics simulation system calculating can
See that pseudorange value of the satellite-signal at emulation moment epoch is recorded by certain format in file.
Third walks, the acquisition and storage of pps pulse per second signal and satellite navigation signals.
Using the collecting device 4 of high sampling rate, the pps pulse per second signal and radio frequencies that exported to satellite navigation signal simulator 5 are led
Boat signal is carried out at the same time acquisition.In the present embodiment, the size of sample rate directly influences the accuracy of judgement of pulse per second (PPS) rising edge
Degree, therefore, sample rate used in data acquisition is preferably not below 1GHz；And due to simulator 5 export be normally to believe
Number simulating scenes need the navigation signal for solving acquisition corresponding imitative to calculate simulator time delay by pseudorange comparison
True moment epoch, i.e. week count and the second in week, so the navigation signal of acquisition needs a prime frame for completely including navigation message,
For GPS and Beidou satellite navigation system, the navigation data of 36s can include completely a prime frame, it is therefore desirable to acquire 40s or
The navigation data of longer time.
4th step is handled and is resolved to the pps pulse per second signal and satellite navigation signals of acquisition.
First, interpolation can be passed through in order to more accurately find out rising edge corresponding sampled point to the pps pulse per second signal of acquisition
Improve the judgement precision of pps pulse per second signal rising edge；Then, to the satellite navigation signals of acquisition, it is caught using receiver
Tracking is obtained, the carrier frequency and initial code phase positions estimated value that satellite-signal is first roughly calculated out use estimating carrier frequencies later
Value and initial code phase positions estimated value initialization carrier tracking loop and code tracking loop.In order to eliminate signal under normal signal simulating scenes
The dynamic stress error of track loop sets carrier tracking loop to third order pll, and code tracking loop is set as scond-order lag lock
Determine ring, and code tracking loop is assisted using carrier tracking loop.
After loop enters lock-out state, exported using the pps pulse per second signal rising edge of acquisition as the pseudorange of code tracking loop
Moment epoch, pseudorange export at moment epoch at corresponding simulator emulation moment epoch then by resolving navigation signal in pulse per second (PPS)
It rises to count in the week at and be obtained with the second in week.The pseudorange that tracking is exported into code ring after lock-out state is subtracted in step 2 and is simulated
The pseudorange at corresponding emulation moment epoch of device record, then divided by the light velocity to get to without cable and the modified simulation of connector time delay
Device time delay value.
5th step measures the time delay value of each additional components and final simulator time-delay calculation.
Since the pps pulse per second signal and radio frequency navigation signal of simulator output are to be linked into collecting device by cable,
The time delay of two sections of cables and connector is measured also just particularly important.Vector network analyzer may be used in the length of delay of each cable
It measures, and the value can measure in advance, directly be deducted in final data processing, to obtain final simulator itself
Time delay value.
In conclusion technical solution of the present invention, zero pseudorange need not be arranged in calibration or fix the special of pseudorange
Scene, in the case where simulator normal state simulation exports, by the satellite navigation signals and benchmark second pulse signal of simulator output
Be acquired by dual channel high speed apparatus for acquiring and storing, the satellite navigation signals of acquisition, by capture and track algorithm, with
After track loop enters locking, moment epoch is exported using collected pulse per second (PPS) rising edge as the pseudorange of loop, records and preserves
The pseudorange that loop calculates compares the pseudorange that the pseudorange that loop calculates is calculated with simulator mathematics simulation system, the two
Between corresponding time difference, then remove the time delay of the introducings such as cable and connector, as the time delay value of simulator itself.
Obviously, the above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be pair
The restriction of embodiments of the present invention may be used also on the basis of the above description for those of ordinary skill in the art
To make other variations or changes in different ways, all embodiments can not be exhaustive here, it is every to belong to this hair
Row of the obvious changes or variations that bright technical solution is extended out still in protection scope of the present invention.
Claims (10)
1. a kind of system for GNSS signal simulator time-delay calibration, which includes satellite navigation signal simulator and data
Acquisition module, which is characterized in that the described system further comprises isolated amplifier, signal processing module；
External timing signal is divided into the first clock signal and second clock signal by the isolated amplifier；
First clock signal of the satellite navigation signal simulator, self-isolation in future amplifier is being received as work clock
Machine is that output radio frequency is led under the normal signal simulating scenes that stationary state and satellite navigation signal simulator pseudorange change over time
Navigate signal and pps pulse per second signal；
The second clock signal of the data acquisition module, self-isolation in future amplifier comes from as sampling clock for acquiring
The radio frequency navigation signal and pps pulse per second signal of satellite navigation signal simulator；
The signal processing module is based on collected radio frequency navigation signal and pps pulse per second signal, the radio frequency is calculated and leads
The pseudorange of emulation moment epoch simulator record, is defended at pseudorange and the pps pulse per second signal rising edge to navigate corresponding to signal
The self time-delay of star navigation signal simulator.
2. time delay calibration system according to claim 1, which is characterized in that the signal processing module includes
Pps pulse per second signal leading edge position determination unit and
Navigation signal acquisition and tracking unit；
The pps pulse per second signal leading edge position determination unit is used to determine the sampled point corresponding to pps pulse per second signal rising edge；
The navigation signal acquisition and tracking unit is used to determine the carrier frequency and initial code phase positions letter of the radio frequency navigation signal
It ceases and the tracking to signal is unfolded according to the information.
3. time delay calibration system according to claim 1, which is characterized in that the signal processing module further comprises
Week count and week in second determination unit and
Track loop solving unit；
The week counts and second determination unit in week, and the week for obtaining radio frequency navigation signal at pps pulse per second signal rising edge counts
With the second in week, and then obtain the emulation moment epoch simulator record pseudorange；
The track loop solving unit as receiver clock and calculates pps pulse per second signal at pps pulse per second signal rising edge
The pseudorange of the radio frequency navigation signal is subtracted based on the pseudorange and emulates the simulation of moment epoch at the pps pulse per second signal rising edge
Device record pseudorange, then divided by the light velocity to get to without cable and the modified simulator time delay value of connector time delay.
4. time delay calibration system according to claim 3, which is characterized in that described
Data acquisition module acquires the radio frequency navigation signal and pps pulse per second signal by the first cable and the second cable respectively；
The signal processing module is further subtracted according to according to described without cable and the modified simulator time delay value of connector time delay
The time delay value of the time delay value and the second cable of first cable, obtains the time delay value of satellite navigation signal simulator.
5. time delay calibration system according to claim 1, which is characterized in that the described system further comprises
Vector signal source, for receiving the second clock signal from isolated amplifier as work clock, output is not less than
The frequency signal of 1GHz is simultaneously delivered to data acquisition module.
6. time delay calibration system according to claim 1, which is characterized in that the described system further comprises atomic clock,
For providing external timing signal.
7. time delay calibration system according to claim 1, which is characterized in that the data acquisition module need to respectively acquire not
The radio frequency navigation signal and pps pulse per second signal of satellite navigation signal simulator output less than 40s.
8. one kind being used for GNSS signal simulator time delay calibrating method, which is characterized in that described this method includes
Same external timing signal is respectively supplied to satellite navigation signal simulator and data acquisition module；
Satellite navigation signal simulator is stationary state and satellite in receiver using the external timing signal as work clock
Radio frequency navigation signal and pps pulse per second signal are exported under the normal signal simulating scenes that navigation signal simulator pseudorange changes over time；
Data acquisition module is using the external timing signal as sampling clock, for acquiring satellite navigation signal simulator simultaneously
The radio frequency navigation signal and pps pulse per second signal of output；
Based on collected radio frequency navigation signal and pps pulse per second signal, the corresponding sampled point of pps pulse per second signal rising edge and really is determined
Determine the carrier frequency of radio frequency navigation signal and initial code phase positions information and tracking to signal is unfolded according to the information；
The pseudorange of the radio frequency navigation signal and emulation moment epoch at the pps pulse per second signal rising edge is calculated, and then obtains
The pseudorange recorded to the emulation moment epoch simulator, obtains the self time-delay of satellite navigation signal simulator.
9. time delay calibrating method according to claim 8, which is characterized in that described this method further comprises
Week count and week in the second determine algorithm, for obtain at pps pulse per second signal rising edge week count and week in the second, and then
The pseudorange recorded to the emulation moment epoch simulator；
Pps pulse per second signal as receiver clock and is calculated the radio frequency at pps pulse per second signal rising edge by tracking algorithm
The pseudorange of navigation signal subtracts the puppet that moment epoch simulator record is emulated at pps pulse per second signal rising edge based on the pseudorange
Away from, then divided by the light velocity to get to without cable and the modified simulator time delay value of connector time delay.
10. time delay calibrating method according to claim 9, which is characterized in that described this method further comprises
Data acquisition module acquires the radio frequency navigation signal and pps pulse per second signal by the first cable and the second cable respectively；
According to the time delay value and for subtracting first cable without cable and the modified simulator time delay value of connector time delay
The time delay value of two cables obtains the time delay value of satellite navigation signal simulator.
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| CN106932792B (en) * | 2017-03-29 | 2019-05-17 | 中国人民解放军国防科学技术大学 | A kind of navigation signal simulator time-delay measuring method based on software receiver |
| CN107682074B (en) * | 2017-11-08 | 2024-03-29 | 南京天际易达通信技术有限公司 | Satellite uplink signal transmitting time compensation method, device and communication system |
| CN108768761B (en) * | 2018-04-11 | 2022-02-15 | 武汉大学 | Method and device for measuring nanosecond time precision of network signal transmission delay |
| CN112731463B (en) * | 2020-12-14 | 2024-02-09 | 航天恒星科技有限公司 | Synchronous simulation system combining GNSS navigation constellation and receiver |
| CN113960919A (en) * | 2021-10-15 | 2022-01-21 | 合肥移瑞通信技术有限公司 | GNSS time service precision test system and method |
| CN114465673B (en) * | 2022-01-18 | 2023-08-04 | 中国人民解放军国防科技大学 | Navigation channel simulation data flow precision control method and system |
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