CN103308929A - Satellite navigation signal simulator used for pseudorange precision index measurement - Google Patents
Satellite navigation signal simulator used for pseudorange precision index measurement Download PDFInfo
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- CN103308929A CN103308929A CN2013101963647A CN201310196364A CN103308929A CN 103308929 A CN103308929 A CN 103308929A CN 2013101963647 A CN2013101963647 A CN 2013101963647A CN 201310196364 A CN201310196364 A CN 201310196364A CN 103308929 A CN103308929 A CN 103308929A
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Abstract
The invention provides a satellite navigation signal simulator used for pseudorange precision index measurement, which can meet the measurement requirements of any pseudorange magnitude range, is high in measurement accuracy and meets the calibration and verification requirements of the pseudorange precision index of the satellite navigation signal simulator. The satellite navigation signal simulator comprises a radio frequency output port capable of outputting a radio frequency simulation signal, and a calibration signal output port capable of outputting a periodic calibration signal synchronous with the radio frequency simulation signal, or a synchronous signal input port capable of synchronizing the radio frequency simulation signal with the externally inputted periodic calibration signal; the radio frequency output port outputs the radio frequency simulation signal with the nominal value of the pseudorange being p; and the periodic calibration signal synchronous with the radio frequency simulation signal is used for performing period counting on delay time corresponding to the pseudorange p from a pseudorange initial point, and is used as an outer triggering signal of a time domain analyzer to measure the time interval part of the radio frequency simulation signal, smaller than one period of the calibration signal in the delay time from the pseudorange initial point.
Description
Technical field
The present invention relates to the Satellite Navigation Technique field, particularly relate to a kind of satellite navigation signal simulator for the measurement of pseudorange precision index.
Background technology
Satellite Navigation Technique is based on GLONASS (Global Navigation Satellite System) (GNSS, Global Navigation Satellite System) and to the technology of user-provided location, navigation and Time Service, has been widely used at present the military and civilian field.The user is based on satellite navigation equipment for user, and such as chip, module and end product etc. obtained related service.
In the processes such as the development of satellite navigation equipment for user and inspection, need to customize the navigation signal under the conditions such as different satellite constellations, error model, user trajectory, signal power, verify or check the technical indicator of product whether to satisfy related request, therefore, the manufacturer of satellite navigation equipment for user and testing agency extensively adopt satellite navigation signal simulator to generate as required the navigation simulation signal.
Pseudorange is the original observed quantity that satellite navigation equipment for user carries out location compute, also is 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 precision index is: by the time-domain analysis to simulator radio frequency simulation signal of output under particular dummy scene (the pseudorange nominal value is zero), identify the pseudo range signals starting point and measure its delay (transmission delay of simulation satellite signal) on time shaft, and carry out the measurement of time delay, again it be multiply by the light velocity and be converted to the pseudorange value.The limitation of the method shows as:
1. judge the pseudo range signals starting point by the display waveform of time-domain analysis instrument (such as oscillograph), can identify this point for some signal, such as Big Dipper area navigation simulating signal, with the Barker code overturn point as its unique point, navigation signal for other types then is difficult for maybe can not identifying, so this measuring method is only applicable to the simulator of particular type.
2. be subjected to time-domain analysis instrument time interval measurement precision index and the double constraints that satisfies the longest sampling time index of this measuring accuracy, this measuring method can only be measured the error of pseudorange null value or less pseudorange value, and can not measure the error of any pseudorange.For example: the pseudorange precision index of simulator is 0.05m, being transformed into the transmission time to be about 167ps(be electromagnetic signal should be apart from required time with light velocity propagation), for satisfying the alignment requirements of this index, the time interval measurement precision of time-domain analysis instrument must can reach 167ps, if satisfy more strict calibrating requirement, then need to reach the 55ps magnitude.High-end oscillograph can in the longest certain acquisition time (generally under the highest real-time sampling rate), in 2.5ms, satisfy this measuring accuracy requirement.But this acquisition time can not satisfy 20000km(at least is converted to about 67ms of propagation delay time) the measurement requirement of pseudorange output value scope.
Summary of the invention
The defective that the present invention exists according to prior art, a kind of satellite navigation signal simulator for the measurement of pseudorange precision index is provided, can satisfy the measurement requirement of any pseudorange value scope, accuracy of measurement is high, satisfies calibration and the calibrating requirement of satellite navigation signal simulator pseudorange precision index.
Technical scheme of the present invention is:
A kind of satellite navigation signal simulator for the measurement of pseudorange precision index, comprise the radio frequency output port that to export the radio frequency simulation signal, it is characterized in that, also comprise to export with the calibrating signal output port of the synchronous periodic calibration signal of described radio frequency simulation signal and maybe the periodic calibration signal of described radio frequency simulation signal and outside input can be carried out synchronous synchronous signal input end mouth; Described radio frequency output port output pseudorange nominal value is the radio frequency simulation signal of p, the synchronous periodic calibration signal of described and radio frequency simulation signal is used for pseudorange p is carried out counting complete cycle from the pseudorange starting point corresponding time delay, simultaneously with the external trigger signal of time-domain analysis instrument that acts on time interval measurement, to measure the radio frequency simulation signal from pseudorange starting point time interval part less than the calibrating signal one-period in time delay.
Described radio frequency simulation signal is included in the signature that can be identified by the time-domain analysis instrument that has on the pseudorange starting point.
The signature of described radio frequency simulation signal on the pseudorange starting point is the spike mark.
The cycle of described periodic calibration signal is not more than the time-domain analysis instrument in the longest sampling time of satisfying under the simulator pseudorange precision measure requirement condition.
N-1 periodic signal of described periodic calibration signal has the feature that can trigger the time-domain analysis instrument, and wherein N is the complete cycle issue of periodic calibration signal.
Described periodic calibration signal is the calibration pulse signal, and the high level of N-1 pulse of described calibration pulse signal is elevated the external trigger signal as the time-domain analysis instrument, and wherein N is the complete cycle issue of calibration pulse.
Technique effect of the present invention:
A kind of satellite navigation signal simulator for the measurement of pseudorange precision index provided by the invention can satisfy the measurement requirement of any pseudorange value scope, and accuracy of measurement is high, satisfies calibration and the calibrating requirement of satellite navigation signal simulator pseudorange precision index.
By satellite navigation signal simulator provided by the invention, can realize tracing to the source of simulator pseudorange value: 1. for the simulator that can export the radio frequency simulation signal of wanting required for the present invention and periodic calibration signal, can use described simulator and calibrate, realize pseudorange value tracing to the source to the time frequency parameter.2. for the simulator that can not export the radio frequency simulation signal of wanting required for the present invention and periodic calibration signal, can at first calibrate the satellite navigation receiver of high-precision stable performance with the calibrated simulator of the present invention, 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 the time frequency parameter.
Description of drawings
Fig. 1 is the embodiment schematic diagram that adopts satellite navigation signal simulator of the present invention to carry out the pseudorange precision measure.
Fig. 2 is another embodiment schematic diagram that adopts satellite navigation signal simulator of the present invention to carry out the pseudorange precision measure.
Fig. 3 is the radio frequency simulation signal of simulator output of Fig. 2 embodiment and the waveform schematic diagram of calibration pulse signal.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are described in further detail.
A kind of satellite navigation signal simulator for the measurement of pseudorange precision index, comprise the radio frequency output port that to export the radio frequency simulation signal, also comprise to export with the calibrating signal output port of the synchronous periodic calibration signal of described radio frequency simulation signal and maybe the periodic calibration signal of described radio frequency simulation signal and outside input can be carried out synchronous synchronous signal input end mouth; Radio frequency output port output pseudorange nominal value is the radio frequency simulation signal of p, the periodic calibration signal synchronous with the radio frequency simulation signal is used for pseudorange p is carried out counting complete cycle from the pseudorange starting point corresponding time delay, simultaneously with the external trigger signal of time-domain analysis instrument that acts on time interval measurement, to measure the radio frequency simulation signal from pseudorange starting point time interval part less than the calibrating signal one-period in time delay.
As shown in Figure 1, be the embodiment schematic diagram that adopts satellite navigation signal simulator of the present invention to carry out the pseudorange precision measure.Comprise satellite navigation signal simulator, the periodic calibration signal generator, the time-domain analysis instrument, cycle count instrument and period measurement instrument, satellite navigation signal simulator has and the periodic calibration signal of radio frequency simulation signal and the output of periodic calibration signal generator can be carried out synchronous synchronous signal input end mouth, the output terminal of the radio frequency simulation signal of simulator connects the first passage of time-domain analysis instrument, the output terminal of periodic calibration signal generator connects the second channel of time-domain analysis instrument and the external trigger port of time-domain analysis instrument, and the output terminal of while periodic calibration signal generator is the synchronous signal input end mouth of connecting analog device also, the input port of the input port of cycle count instrument and period measurement instrument; It is the radio frequency simulation signal of p that satellite navigation signal simulator is used for output pseudorange nominal value, the periodic calibration signal generator, the time-domain analysis instrument, cycle count instrument and period measurement instrument are used for measuring the corresponding time delay of pseudorange p, by periodic calibration signal generator output periodic calibration signal, by cycle count instrument and period measurement instrument correlation frequently simulate signal carry out cycle of counting and the Measurement and calibration signal of complete cycle issue from the delay in time of pseudorange starting point, by time-domain analysis apparatus measures radio frequency simulation signal pseudorange starting point time interval part less than the calibrating signal one-period in time delay.In the present embodiment, the periodic calibration signal generator is pulse signal generator, and the time-domain analysis instrument is oscillograph, and cycle count instrument and period measurement instrument are frequency counter.
Wherein, the radio frequency simulation signal of satellite navigation signal simulator output is used for identifying the pseudorange starting point to measure time delay corresponding to any pseudorange value.Add in the pseudo range signals initial point position and to be easy to arbitrarily the signature that identifies, spiking for example is so that can accurately identify this point on the time-domain analysis instrument.The periodic calibration signal of periodic calibration signal generator output is used for the counting that time delay carry out complete cycle issue corresponding to any pseudorange value; Calibrating signal and radio frequency simulation signal are exported synchronously, and its cycle is not more than the time-domain analysis instrument in the longest sampling time (generally under high sampling rate) of satisfying under the simulator pseudorange precision measure requirement condition.For example: simulator pseudorange precision index is 0.05m, wish satisfies its alignment requirements, the time resolution of time-domain analysis instrument needs to reach 167ps at least, suppose the time-domain analysis instrument for certain model, the longest sampling time of satisfying this accuracy requirement is 2.5ms, then requires the cycle T of the calibrating signal of periodic calibration signal generator output to be not more than 2.5ms.As the external trigger signal of time-domain analysis instrument, N-1 periodic signal of periodic calibration signal has the feature that can trigger the time-domain analysis instrument to the periodic calibration signal simultaneously, and wherein N is the complete cycle issue of calibrating signal.For the calibration pulse signal of pulse signal generator output in the present embodiment, the high level of calibrating N-1 pulse of pulse signal is raised as oscillographic external trigger signal, wherein N is the complete cycle issue of calibration pulse.
As shown in Figure 2, be another embodiment schematic diagram that adopts satellite navigation signal simulator of the present invention to carry out the pseudorange precision measure.In the present embodiment, satellite navigation signal simulator has the calibrating signal output port that can export with the synchronous periodic calibration signal of radio frequency simulation signal; In the present embodiment, satellite navigation signal simulator output pseudorange nominal value is the radio frequency simulation signal of p, exports synchronously simultaneously the periodic calibration pulse signal.The time-domain analysis instrument that is used for time interval measurement is oscillograph, be used for to the calibration pulse signal carry out complete cycle counting number and cycle count instrument and the period measurement instrument of Measurement and calibration pulse signal cycle be frequency counter.The output terminal of radio frequency simulation signal (being called for short " radio frequency output " among Fig. 2) connects oscillographic first passage, the output terminal of calibration pulse signal (being called for short " calibrating signal output " among Fig. 2) connects oscillographic second channel and oscillographic external trigger port, and the output terminal of simultaneously calibration pulse signal is the rate of connections counter also.
Fig. 3 is the radio frequency simulation signal of simulator output of the described embodiment of Fig. 2 and the waveform schematic diagram of calibration pulse signal.Wherein the radio frequency simulation signal is illustrated with sinusoidal wave, does not draw actual modulation waveform (the actual modulated waveform does not present periodically).The radio frequency simulation signal of output adds spike as signature in the 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.
The method of carrying out the pseudorange precision measure is, it is the radio frequency simulation signal of p that satellite navigation signal simulator output pseudorange nominal value is set, to be converted to the measurement of pseudorange p the measurement of time delay, described time measurement is decomposed into the measurement of part complete cycle and the measurement of fraction part, described complete cycle, measurement partly referred to the periodic calibration signal radio frequency simulate signal be carried out from the delay in time of pseudorange starting point the cycle of counting and the Measurement and calibration signal of complete cycle issue, the measurement of described fraction part refer to measure radio frequency simulation signal pseudorange starting point in time delay less than the time interval part of calibrating signal one-period, the actual measured value p ' that obtains thus simulator output pseudorange nominal value p is:
p′＝c×(NT+d) （1）
Wherein:
The actual measured value of p '-simulator output pseudorange
C-electromagnetic wave velocity of propagation in a vacuum
N-calibrating signal complete cycle issue, N is since 0 counting
T-calibrating signal cycle
The fraction part of d-time delay, i.e. in time delay less than the time interval part in a calibrating signal cycle; The error delta p of simulator output pseudorange is:
Δp＝p-p′ （2）。
Adopt the measuring process of the described embodiment of Fig. 2 as follows:
1. connect tested simulator and oscillograph and frequency counter by Fig. 2, the 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 operation pseudorange nominal value is the test simulating scenes of p, p can arrange arbitrarily in the pseudorange value output area that simulator is supported, simulator is exported calibration pulse signal and radio frequency simulation signal synchronously, when output calibration pulse signal, simulator will calculate complete cycle issue N according to formula (1), and the high level of raising N-1 pulse be used for to trigger oscillograph.
3. after oscillograph triggers, passage 1 demonstrates the waveform of stable radio frequency output signal fraction part, passage 2 demonstrates the waveform of stable N pulse of calibration pulse signal, go out the rising edge of N calibration pulse and the time interval between radio frequency simulation signal pseudorange starting point with oscilloscope measurement, can obtain the measured value of the fraction part d in the formula (1).
4. with cycle and the pulse number of frequency counter Measurement and calibration pulse signal, obtain the measured value that N is counted in calibration pulse cycle T in the formula (1) and calibration pulse.
5. according to formula (1), calculate the actual measured value p ' of simulator output pseudorange nominal value p, according to the error of formula (2) compute simulator output pseudorange.
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 still and can make amendment or be equal to replacement the invention; And all do not break away from technical scheme and the improvement thereof of the spirit and scope of the present invention, and it all is encompassed in the middle of the protection domain of the invention patent.
Claims (6)
1. one kind is used for the satellite navigation signal simulator that the pseudorange precision index is measured, comprise the radio frequency output port that to export the radio frequency simulation signal, it is characterized in that, also comprise to export with the calibrating signal output port of the synchronous periodic calibration signal of described radio frequency simulation signal and maybe the periodic calibration signal of described radio frequency simulation signal and outside input can be carried out synchronous synchronous signal input end mouth; Described radio frequency output port output pseudorange nominal value is the radio frequency simulation signal of p, p is the arbitrary value in the simulator pseudorange value output area, the synchronous periodic calibration signal of described and radio frequency simulation signal is used for pseudorange p is carried out counting complete cycle from the pseudorange starting point corresponding time delay, simultaneously with the external trigger signal of time-domain analysis instrument that acts on time interval measurement, to measure the radio frequency simulation signal from pseudorange starting point time interval part less than the calibrating signal one-period in time delay.
2. the satellite navigation signal simulator of measuring for the pseudorange precision index according to claim 1 is characterized in that, described radio frequency simulation signal is included in the signature that can be identified by the time-domain analysis instrument that has on the pseudorange starting point.
3. the satellite navigation signal simulator for the measurement of pseudorange precision index according to claim 2 is characterized in that, the signature of described radio frequency simulation signal on the pseudorange starting point is the spike mark.
4. the satellite navigation signal simulator of measuring for the pseudorange precision index according to claim 1, it is characterized in that, the cycle of described periodic calibration signal is not more than the time-domain analysis instrument in the longest sampling time of satisfying under the simulator pseudorange precision measure requirement condition.
5. the satellite navigation signal simulator of measuring for the pseudorange precision index according to claim 4, it is characterized in that, N-1 periodic signal of described periodic calibration signal has the feature that can trigger the time-domain analysis instrument, and wherein N is the complete cycle issue of periodic calibration signal.
6. the satellite navigation signal simulator of measuring for the pseudorange precision index according to claim 5, it is characterized in that, described periodic calibration signal is the calibration pulse signal, the high level of N-1 pulse of described calibration pulse signal is elevated the external trigger signal as the time-domain analysis instrument, and wherein N is the complete cycle issue of calibration pulse.
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| CN102608624A (en) * | 2012-03-14 | 2012-07-25 | 桂林电子科技大学 | GPS (global positioning system) simulator and receiver closed-loop testing method and system |
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| US20050052319A1 (en) * | 2003-09-05 | 2005-03-10 | Hatch Ronald R. | Method for receiver autonomous integrity monitoring and fault detection and elimination |
| CN101706580A (en) * | 2009-11-24 | 2010-05-12 | 北京航空航天大学 | PXIe bus based GNSS signal simulator and implementation method thereof |
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Application publication date: 20130918 |