CN103308930B - Pseudo-range precision measurement method of satellite navigation signal simulator - Google Patents
Pseudo-range precision measurement method of satellite navigation signal simulator Download PDFInfo
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Abstract
The invention provides a pseudo-range precision measurement method of a satellite navigation signal simulator, which can meet the measurement requirement of any pseudo-range value range, has high accuracy of measurement, and meets the calibration and verification requirements of the pseudo-range precision index of the satellite navigation signal simulator. The measurement method comprises the following steps: setting the satellite navigation signal simulator to output a radio frequency simulation signal of which the pseudo-range nominal value is p; converting the measurement of the pseudo-range p to the measurement of delay time corresponding to the pseudo-range p; and decomposing the time measurement into the measurement of a whole cycle part and the measurement of a decimal part. The measurement of the whole period part means that a periodic calibration signal is used for counting the whole cycles of the delay time of the radio frequency simulation signal from a pseudo-range start point, and the cycle of the calibration signal is measured. The measurement of the decimal part means that the time interval part smaller than one cycle of the calibration signal of the delay time of the radio frequency simulation signal from the pseudo-range start point is measured.
Description
Technical field
The present invention relates to technical field of satellite navigation, particularly relate to a kind of Pseudo-range precision measurement method of satellite navigation signal simulator.
Background technology
Satellite Navigation Technique is based on the technology of GLONASS (Global Navigation Satellite System) (GNSS, Global Navigation Satellite System) to user-provided location, navigation and Time Service, has been widely used in military and civilian field at present.User is based on satellite navigation equipment for user, and such as chip, module and end product etc., obtain related service.
In the process such as development and inspection of satellite navigation equipment for user, needs can customize the navigation signal under the conditions such as different satellite constellation, error model, user trajectory, signal power, verify or check the technical indicator of product whether to meet related request, therefore, the manufacturer of satellite navigation equipment for user and testing agency extensively adopt satellite navigation signal simulator to generate navigation simulation signal as required.
Pseudorange is the original observed quantity that satellite navigation equipment for user carries out location compute, is also the crucial emulated data that satellite navigation signal simulator produces, and the error size of simulator emulation pseudorange is directly connected to the confidence level of tested receiver testing result.At present, the measuring method of satellite navigation signal simulator pseudorange accuracy index is: by the time-domain analysis of radio frequency simulation signal exported under particular dummy scene (pseudorange nominal value is zero) simulator, identify pseudo range signals starting point and measure its delay (transmission delay of simulation satellite signal) on a timeline, and carried out the measurement of time delay, then be multiplied by the light velocity and be converted to pseudorange value.The limitation of the method shows as:
1. judge pseudo range signals starting point by the display waveform of time-domain analysis instrument (as oscillograph), this point can be identified for some signal, as Big Dipper area navigation simulating signal, using Barker code overturn point as its unique point, navigation signal for other types then not easily maybe can not identify, therefore this measuring method is only applicable to the simulator of particular type.
2., by time-domain analysis appliance time interval measurement precision index and the double constraints of the longest sampling time index meeting this measuring accuracy, this measuring method can only measure the error of pseudorange null value or less pseudorange value, and can not measure the error of any pseudorange.Such as: the pseudorange accuracy index of simulator is 0.05m, being transformed into the transmission time is about 167ps(and electromagnetic signal with this distance required time of light velocity propagation), for meeting the alignment requirements of this index, the time interval measurement precision of time-domain analysis instrument must can reach 167ps, if meet more strict calibrating requirement, then need to reach 55ps magnitude.High-end oscillograph at certain the longest acquisition time (generally under the highest real-time sampling rate), as in 2.5ms, can meet this measuring accuracy requirement.But this acquisition time can not meet at least 20000km(and be converted to the propagation delay time and be about 67ms) pseudorange export the measurement requirement of value scope.
Summary of the invention
The defect that the present invention exists according to prior art, a kind of measuring method of satellite navigation signal simulator pseudorange accuracy is provided, can meet the measurement requirement of any pseudorange value scope, accuracy of measurement is high, meets calibration and the calibrating requirement of satellite navigation signal simulator pseudorange accuracy index.
Technical scheme of the present invention is:
A kind of Pseudo-range precision measurement method of satellite navigation signal simulator, it is characterized in that, satellite navigation signal simulator is set and exports the radio frequency simulation signal that pseudorange nominal value is p, the measurement of pseudorange p will be converted to the measurement to time delay corresponding to pseudorange p, described time measurement is decomposed into the measurement of part complete cycle and the measurement of fraction part, the measurement of part referred to and carried out the counting of complete cycle issue and the cycle of Measurement and calibration signal with periodic calibration signal radio frequency simulate signal from the delay in time of pseudorange starting point described complete cycle, the measurement of described fraction part refers to the time interval part measured radio frequency simulation signal pseudorange starting point and be less than calibrating signal one-period time delay, the actual measured value p ' obtaining simulator output pseudorange nominal value p is thus:
p′=c×(NT+d) （1）
Wherein:
P '-simulator exports the actual measured value of pseudorange
C-electromagnetic wave velocity of propagation in a vacuum
N-calibrating signal complete cycle issue, N counts from 0
The T-calibrating signal cycle
The fraction part of d-time delay, is namely less than the time interval part in a calibrating signal cycle in time delay; Then the error delta p of simulator output pseudorange is:
Δp=p-p′ （2）。
The radio frequency simulation signal that described simulator exports, add the signature being easy to arbitrarily identify in pseudorange initial point position, described signature can be used to the time-domain analysis instrument identification of time interval measurement.
Described periodic calibration signal and described radio frequency simulation signal synchronism output, the cycle of described periodic calibration signal is not more than time-domain analysis instrument and is meeting the longest sampling time under simulator pseudorange accuracy measurement requirement condition.
Described periodic calibration signal is used as the external trigger signal of time-domain analysis instrument simultaneously, N-1 periodic signal of described periodic calibration signal has the feature that can trigger time-domain analysis instrument, wherein N is the complete cycle issue of calibrating signal, is calculated according to formula (1) by simulator.
Described periodic calibration signal is calibration pulse signal, is used for triggering time-domain analysis instrument by the high level of N-1 the pulse signal raised, and wherein N is the complete cycle issue of calibration pulse, is calculated according to formula (1) by simulator.
Technique effect of the present invention:
The measuring method of a kind of satellite navigation signal simulator pseudorange accuracy provided by the invention, can meet the measurement requirement of any pseudorange value scope, accuracy of measurement is high, meets calibration and the calibrating requirement of satellite navigation signal simulator pseudorange accuracy index.
By measuring method of the present invention, tracing to the source of simulator pseudorange value can be realized: 1. for the simulator of the radio frequency simulation signal that can export required for measuring method of the present invention and periodic calibration signal, described measuring method can be applied calibrate, realize pseudorange value tracing to the source to time frequency parameter.2. for the simulator of the radio frequency simulation signal that can not export required for measuring method of the present invention and periodic calibration signal, can first calibrate with the satellite navigation receiver of calibrated simulator to high-precision stable performance that the inventive method is used, and then with other universal simulators of this receiver calibration, realize all kinds of satellite navigation signal simulator pseudorange values tracing to the source to time frequency parameter.
Accompanying drawing explanation
Fig. 1 is the schematic diagram implementing measuring method of the present invention.
Fig. 2 implements the radio frequency simulation signal of measuring method of the present invention and the waveform schematic diagram of periodic calibration signal.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are described in further detail.
A kind of Pseudo-range precision measurement method of satellite navigation signal simulator, satellite navigation signal simulator is set and exports the radio frequency simulation signal that pseudorange nominal value is p, the measurement of pseudorange p will be converted to the measurement to time delay corresponding to pseudorange p, described time measurement is decomposed into the measurement of part complete cycle and the measurement of fraction part, the measurement of part referred to and carried out the counting of complete cycle issue and the cycle of Measurement and calibration signal with periodic calibration signal radio frequency simulate signal from the delay in time of pseudorange starting point described complete cycle, the measurement of described fraction part refers to the time interval part measured radio frequency simulation signal pseudorange starting point and be less than calibrating signal one-period time delay, the actual measured value p ' obtaining simulator output pseudorange nominal value p is thus:
p′=c×(NT+d) （1）
Wherein:
P '-simulator exports the actual measured value of pseudorange
C-electromagnetic wave velocity of propagation in a vacuum
N-calibrating signal complete cycle issue, N counts from 0
The T-calibrating signal cycle
The fraction part of d-time delay, is namely less than the time interval part in a calibrating signal cycle in time delay;
Then the error delta p of simulator output pseudorange is:
Δp=p-p′ （2）。
For realizing above-mentioned measuring method, periodic calibration signal and the radio frequency simulation signal of the present invention's structure are as follows:
1. the radio frequency simulation signal of simulator output, for identifying pseudorange starting point to measure time delay corresponding to any pseudorange value.The signature being easy to arbitrarily identify is added, such as spiking, so that this point accurately can be identified on time-domain analysis instrument in pseudo range signals initial point position.
2. periodic calibration signal is exported by simulator or is exported by periodic calibration signal generator, for the counting that time delay carry out complete cycle issue corresponding to any pseudorange value.Calibrating signal and radio frequency simulation signal synchronism output, its cycle is not more than time-domain analysis instrument meeting simulator pseudorange accuracy and measures the longest sampling time under requirement condition (generally most high sampling rate under).Such as: simulator pseudorange accuracy index is 0.05m, for meeting its alignment requirements, the time resolution of time-domain analysis instrument at least needs to reach 167ps, suppose the time-domain analysis instrument for certain model, the longest sampling time meeting this accuracy requirement is 2.5ms, then require that the cycle T of calibrating signal is not more than 2.5ms.
3. periodic calibration signal is used as the external trigger signal of time-domain analysis instrument simultaneously, N-1 periodic signal of periodic calibration signal has the feature that can trigger time-domain analysis instrument, such as raise the high level of N-1 periodic signal, wherein N is the complete cycle issue of calibrating signal.For any pseudorange nominal value p to be measured, simulator calculates N according to formula (1), and when exporting the pseudo range signals of this value, synchronism output calibrating signal is for triggering time-domain analysis instrument.
As shown in Figure 1, for implementing the embodiment schematic diagram of measuring method of the present invention.In the present embodiment, satellite navigation signal simulator exports the radio frequency simulation signal that pseudorange nominal value is p, simultaneously by simulator synchronism output periodic calibration pulse signal.Time-domain analysis instrument for time interval measurement is oscillograph, and frequency counter is used for carrying out counting number the cycle of Measurement and calibration signal complete cycle to calibrating signal.The output terminal (being called for short " radio frequency output " in Fig. 1) of radio frequency simulation signal connects oscillographic first passage, the output terminal (being called for short " calibrating signal output " in Fig. 1) of calibration pulse signal connects oscillographic second channel and oscillographic external trigger port, the output terminal also rate of connections counter of the signal of calibration pulse simultaneously; Wherein, the radio frequency simulation signal exported is included in the signature that can be used to the time-domain analysis instrument identification of time interval measurement that pseudorange starting point has, the cycle of the calibration pulse signal exported is not more than time-domain analysis instrument and is meeting the longest sampling time under simulator pseudorange accuracy measurement requirement condition, the pulse signal that the high level of N-1 pulse of calibration pulse signal is elevated is as oscillographic external trigger signal, and wherein N is the complete cycle issue of calibration pulse.
Fig. 2 is the radio frequency simulation signal of simulator output and the waveform schematic diagram of calibration pulse signal of implementing measuring method of the present invention.Wherein radio frequency simulation signal sinusoidal wave is illustrated, does not draw actual modulation waveform (actual modulated waveform does not present periodically).The radio frequency simulation signal exported adds spike as signature in pseudorange initial point position, and the high level of N-1 pulse of the calibration pulse signal of output is elevated as oscillographic external trigger signal.
Measuring process is as follows:
1. connect tested simulator and oscillograph and frequency counter by Fig. 1, radio frequency simulation signal output part connects oscillographic passage 1; The output terminal access channel oscilloscope 2 of calibration pulse signal, accesses oscillograph external trigger input port simultaneously; The output terminal access frequency counter input end of calibration pulse signal.
2. simulator runs the test simulating scenes that pseudorange nominal value is p, p can be arranged arbitrarily in the pseudorange value output area of simulator support, simulator synchronism output calibration pulse signal and radio frequency simulation signal, when exporting calibration pulse signal, simulator will calculate complete cycle issue N according to formula (1), and the high level raising N-1 pulse is for trigger oscillographic device.
3. after oscillograph triggers, passage 1 demonstrates the waveform of stable radio frequency output signal fraction part, passage 2 demonstrates the waveform of the stable N number of pulse of calibration pulse signal, go out the time interval between the rising edge of N number of calibration pulse and radio frequency simulation signal pseudorange starting point with oscilloscope measurement, the measured value of the fraction part d in formula (1) can be obtained.
4., with cycle and the pulse number of frequency counter Measurement and calibration pulse signal, obtain the measured value of calibration pulse cycle T in formula (1) and calibration pulse number N.
5., according to formula (1), calculate the actual measured value p ' that simulator exports pseudorange nominal value p, export the error delta p of pseudorange according to formula (2) compute simulator.
It should be pointed out that the above embodiment can make the invention of those skilled in the art's comprehend, but do not limit the present invention in any way creation.Therefore, although this instructions and embodiment have been described in detail to the invention, it will be appreciated by those skilled in the art that and still can modify to the invention or equivalent replacement; And all do not depart from technical scheme and the improvement thereof of the spirit and scope of the present invention, it is all encompassed in the middle of the protection domain of the invention patent.
Claims (3)
1. a Pseudo-range precision measurement method of satellite navigation signal simulator, it is characterized in that, satellite navigation signal simulator is set and exports the radio frequency simulation signal that pseudorange nominal value is p, p is the arbitrary value in simulator pseudorange value output area, the measurement of pseudorange p will be converted to the measurement to time delay corresponding to pseudorange p, described time measurement is decomposed into the measurement of part complete cycle and the measurement of fraction part, the measurement of part referred to and carried out the counting of complete cycle issue and the cycle of Measurement and calibration signal with periodic calibration signal radio frequency simulate signal from the delay in time of pseudorange starting point described complete cycle, the measurement of described fraction part refers to the time interval part measured radio frequency simulation signal pseudorange starting point and be less than calibrating signal one-period time delay, the actual measured value p ' obtaining simulator output pseudorange nominal value p is thus:
p′＝c×(NT+d) (1)
Wherein:
P '-simulator exports the actual measured value of pseudorange
C-electromagnetic wave velocity of propagation in a vacuum
N-calibrating signal complete cycle issue, N counts from 0
T-calibrating signal cycle
The fraction part of d-time delay, is namely less than the time interval part in a calibrating signal cycle in time delay; Then the error delta p of simulator output pseudorange is:
Δp＝p-p′ (2)。
2. Pseudo-range precision measurement method of satellite navigation signal simulator according to claim 1, it is characterized in that, the radio frequency simulation signal that described simulator exports, add the signature being easy to arbitrarily identify in pseudorange initial point position, described signature can be used to the time-domain analysis instrument identification of time interval measurement.
3. Pseudo-range precision measurement method of satellite navigation signal simulator according to claim 1, it is characterized in that, described periodic calibration signal and described radio frequency simulation signal synchronism output, the cycle of described periodic calibration signal is not more than time-domain analysis instrument and is meeting the longest sampling time under simulator pseudorange accuracy measurement requirement condition; Described periodic calibration signal is used as the external trigger signal of time-domain analysis instrument simultaneously.
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