CN107918137A - A kind of GNSS signal method of reseptance of multi-satellite navigation system - Google Patents
A kind of GNSS signal method of reseptance of multi-satellite navigation system Download PDFInfo
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- CN107918137A CN107918137A CN201711132708.2A CN201711132708A CN107918137A CN 107918137 A CN107918137 A CN 107918137A CN 201711132708 A CN201711132708 A CN 201711132708A CN 107918137 A CN107918137 A CN 107918137A
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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
- G01S19/33—Multimode operation in different systems which transmit time stamped messages, e.g. GPS/GLONASS
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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
- G01S19/35—Constructional details or hardware or software details of the signal processing chain
- G01S19/37—Hardware or software details of the signal processing chain
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- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Position Fixing By Use Of Radio Waves (AREA)
Abstract
The invention discloses a kind of GNSS signal method of reseptance of multi-satellite navigation system, include the following steps：Receive multi-satellite navigation system digits intermediate-freuqncy signal；Baseband signal generation based on same frequency complex carrier；By the despreading of the corresponding pseudo noise code of multi-satellite navigation system system selection；Gather multiplexing GNSS signal of the satellite to be measured on frequency point to be measured；Each useful signal component is tracked using software receiver；Calculate the general power of the multiplexing GNSS signal of the collecting device output terminal.The present invention is solved in complicated reception environment, also it can guarantee that the available application of satellite-signal having in the air in limited day more from different system, under conditions of signal collected signal-to-noise ratio is higher than 10dB and signal-to-noise ratio (SNR) estimation relative deviation is less than 10%, multiplexing efficiency measurement accuracy is better than 1%.The continuity and reliability of navigator fix are improved, reduces system application risk to greatest extent.
Description
Technical field
The present invention relates to field of communication technology, more particularly to a kind of GNSS signal method of reseptance of multi-satellite navigation system.
Background technology
With global positioning system (Global Positioning System, GPS) and Global Satellite Navigation System
The accelerated promotion of (Global Navigation Satellite System, GLONASS) and Chinese Beidou satellite navigation system
Unite (BeiDou Navigation Satellite System, BDS), galileo satellite navigation system (Galileo
Satellite navigation system, GALILEO) fast development, satellite navigation frequency spectrum resource growing tension, urgently
Need to improve band efficiency using new navigation signal structure and multiplexing technique, so that aeronautical satellite payload exists
In the case of additionally not increasing signal transmission channel, realize that permanent envelope multiplex multichannel is useful on the carrier wave of same frequency or neighbouring frequency point
Signal.Such as L1C/A, L1P, L1M (data and pilot tone) and four signals six of L1C (data and pilot tone) are modulated on GPS L1
Component；E5a (data and pilot tone), E5b (data and pilot tone) two signals, four components are modulated on Galileo E5；Even
The power efficiency of spaceborne high power amplifier is further improved, all signals on neighbouring L2 and L5 frequency points can be carried out to permanent envelope
Multiplexing, transmitting antenna is sent into by same radio-frequency channel.Then the four phase shift keying used in early stage GPS system
Interplex (mutually multiplexing), phase are generated on the basis of (Quadrature Phase Shift Keying, QPSK) technology again
Dry adaptive subcarrier modulation (Coherent Adaptive Subcarrier Modulation, CASM), majority voting
(Majority-Voting, MV), Inter-Voting (mutually voting), alternate binary offset carrier (Alternate Binary
Offset Carrier, AltBOC) and its various modifications, most have phase perseverance envelope launch (Phase Optimized
Constant Envelope Transmission, POCET), dual-frequency P OCET and the permanent envelope multiplex based on orthogonal basis
A variety of permanent envelope multiplex skills such as (Orthogonality-Based Constant Envelope Multiplexing, OBCEM)
Art is come into being.In signal after multiplexing in addition to containing each useful signal component, one or more can be also added
Inter-modulated signal component makes total transmitting signal keep permanent envelope trait.The sum of available signal power is with multiplexing the ratio between general power
Multiplexing efficiency is defined as, multiplexing efficiency is the important indicator for weighing multiplexing performance.Global Navigation Satellite System (GNSS) is
Through being widely used in vehicle mounted guidance, portable navigation device, in wireless telecom equipment, major mobile communication service business is also actively opening
Application of the hair based on positioning service (LBS), provides effective, reliably a variety of services based on positioning function to the user.This is required
GNSS receiver in various communication navigation sets under circumstances, being capable of continuous navigator fix.In general, at least need
Navigator fix could be completed by receiving the signal of 4 satellites, still, in Metropolitan Area or thick forest, due to being subject to high buildings and large mansions
Or the masking of dense vegetation, satellite-signal is hindered or decays, it is seen that number of satellite is drastically reduced, so as to cause navigation fixed
The interruption of position.Therefore, the GNSS signal method of reseptance of multi-satellite navigation system compatible must solve multi-signal structure compatibility,
Compatibility, the performance of multi-satellite navigation system and the problems such as the taking into account of price of multiple systems solution extended code technology.It is clear that defend more
There are sizable technical difficulty for the compatible technique of star navigation system.
The content of the invention
In view of this, technical problem solved by the invention is that providing a kind of GNSS signal of multi-satellite navigation system connects
Receiving method, solve prior art using single satellite navigation system and existing unicity, stability, reliability it is poor, cannot
The technical problem of high-acruracy survey is carried out to multiplexing efficiency.
The present invention solves above-mentioned technical problem by the following technical programs：
A kind of GNSS signal method of reseptance of multi-satellite navigation system, includes the following steps：
S1, receive multi-satellite navigation system digits intermediate-freuqncy signal；
S2, the baseband signal generation based on same frequency complex carrier；
S3, the despreading by the corresponding pseudo noise code of multi-satellite navigation system system selection；
The multiplexing GNSS signal of S4, collection satellite to be measured on frequency point to be measured, to obtain multiplexing GNSS letters
Multiple useful signal component and intermodulation item signals in number；
S5, track each useful signal component using software receiver, and carries out related operation with local signal, with
Obtain the power of each useful signal component；The local signal is consistent with the signal structure of each useful signal component；
S6, calculate the collecting device output terminal multiplexing GNSS signal general power, according to each useful signal
Component power and the general power of multiplexing GNSS signal calculate multiplexing efficiency.
Further, the step S1 includes：
S11, set several multisystem correlator channels；
S12, the multi-satellite navigation system digits intermediate-freuqncy signal of input are via being input to each multisystem after latches
Correlator channel.
Optionally, the step S2 includes：
S21, control carrier wave NCO produce the complex carrier with input intermediate-freuqncy signal same frequency；
The complex carrier that S22, carrier wave NCO are produced is multiplied with the digital medium-frequency signal latched, after obtaining down-converted
Baseband signal x (n).
Further, the step S3 includes the following steps：
S31, control code NCO produce the pulse train with the spreading code same rate of input intermediate-freuqncy signal, while generation and arteries and veins
Rush the identical square-wave signal of sequence period；
S32, the pseudo-random code generator generation pseudo noise code using programmable configuration compatibility multisystem；
S33, the pulse train produced by step 31, driving pseudo-random code generator produce and input spreading code same rate
Pseudo-random code sequence, while timing signal is produced, its cycle is equal to the cycle of pseudo-random code sequence；
S34, selection solution extended code formula
Modulation control word is set to the modulated signal of two kinds of systems, is calculated by modulation control word come control selections solution extended code
Formula, obtains solution extended code：
For BOC (1,1) modulated signal, solution extended code formula is multiplied with pseudo-random code sequence for square-wave signal, is de-spread
Code；
For BPSK modulated signals, solution extended code formula is pseudo-random code sequence, and pseudo-random code sequence is directly becoming solution extended code；
S35, the baseband signal that despreading is calculated
It is multiplied by the obtained solution extended code of the baseband signal x (n) and S34 of the generation, the baseband signal de-spread.
Further, the step S4 includes the following steps：
The frequency point to be measured of S41, selection satellite to be measured and the satellite to be measured；
S42, according to satellite ephemeris calculate the satellite to be measured visual time；The visual time refers to that satellite to be measured is located at high-gain
The time of directional aerial visual range, for into visual range between moment and the departure time for leaving the visual range
Period；
S43, when satellite to be measured enters visual range, utilize gain directional antenna collection radiofrequency signal；
S44, send the radiofrequency signal to collecting device, to obtain multiplexing GNSS signal.
By the present invention multi-satellite navigation system GNSS signal method of reseptance can receive GPS system C/A code signals,
E1 and the E5 letter of GLONAS system C/A code signals, the thick code signal and galileo satellite navigation system of second generation dipper system
Number.The present invention can be selected by BOC (1, the 1) modulated signals and BPSK modulated signals of two kinds of standards of multi-satellite navigation system
Corresponding pseudo noise code is de-spread.Solve the compatibility of multi-signal structure, the compatibility of multiple systems solution extended code technology, multi-satellite navigation
The problems such as taking into account of the performance of system.Correlator block of the present invention is selecting one satellite of reception to lead multiple satellite navigation systems
Boat system can receive the signal of the multi-satellite of the satellite navigation system at the same time, solve even in complicated reception environment
In, it also can guarantee that the available application of satellite-signal having in the air in limited day more from different system.The present invention carries
The high continuity and reliability of navigator fix, reduces system application risk to greatest extent.Adopted using broadband rf signal
Collect equipment and high quantization bit number, the software receiver of high sampling rate ensure the related power damage that Signal Matching processing procedure introduces
Consume it is extremely low, full matching correlator output extraction available signal power can further suppress noise, interference and channel filtering
The influence of characteristic；By signal-to-noise ratio revise signal general power measured value so as to improve measurement accuracy；It ensure that by above-mentioned measure
Under conditions of signal collected signal-to-noise ratio is higher than 10dB and signal-to-noise ratio (SNR) estimation relative deviation is less than 10%, multiplexing efficiency measurement essence
Degree is better than 1%.
Described above is only the general introduction of technical solution of the present invention, in order to better understand the technological means of the present invention,
And can be practiced according to the content of specification, and in order to allow the above and other objects, features and advantages of the present invention can
Become apparent, below in conjunction with preferred embodiment, and coordinate attached drawing, describe in detail as follows.
Brief description of the drawings
Fig. 1 is the flow diagram of the GNSS signal method of reseptance of the multi-satellite navigation system of the present invention.
Embodiment
The invention will now be described in detail with reference to the accompanying drawings, its as part of this specification, illustrates this by embodiment
The principle of invention, other aspects of the present invention, feature and its advantage will be become apparent by the detailed description.Joined
According to attached drawing in, the same or similar component is represented using identical drawing reference numeral in different figures.
As shown in Figure 1, a kind of GNSS signal method of reseptance of multi-satellite navigation system provided in an embodiment of the present invention, it is wrapped
Include following steps：
1) multi-satellite navigation system digits intermediate-freuqncy signal is received
(1) several multisystem correlator channels are set；
(2) the multi-satellite navigation system digits intermediate-freuqncy signal of input is via being input to each multisystem phase after latches
Close device passage；
2) the baseband signal generation based on same frequency complex carrier
(1) carrier wave NCO is controlled to produce the complex carrier with input intermediate-freuqncy signal same frequency；
(2) by this step 2) its (1) carrier wave NCO produce complex carrier with latch digital medium-frequency signal be multiplied, obtain
Baseband signal x (n) after down-converted；
3) despreading of the corresponding pseudo noise code of multi-satellite navigation system system selection is pressed
(1) control code NCO produces the pulse train with the spreading code same rate of input intermediate-freuqncy signal, while generation and pulse
The identical square-wave signal of sequence period；
(2) pseudo noise code is produced using the pseudo-random code generator of programmable configuration compatibility multisystem；
(3) pulse train produced by step 3) its (1), driving pseudo-random code generator produce synchronized with input spreading code
The pseudo-random code sequence of rate, while timing signal is produced, its cycle is equal to the cycle of pseudo-random code sequence；
(4) selection solution extended code formula
Modulation control word is set to the modulated signal of two kinds of systems, is calculated by modulation control word come control selections solution extended code
Formula, obtains solution extended code：
For BOC (1,1) modulated signal, solution extended code formula is multiplied with pseudo-random code sequence for square-wave signal, is de-spread
Code；
For BPSK modulated signals, solution extended code formula is pseudo-random code sequence, and pseudo-random code sequence is directly becoming solution extended code；
(5) baseband signal of despreading is calculated
The solution extended code that the baseband signal x (n) and step 3) its (4) generated by step 2) its (2) is obtained is multiplied, and is de-spread
Baseband signal；
4) multiplexing GNSS signal of the satellite to be measured on frequency point to be measured is gathered, to obtain the multiplexing GNSS signal
In multiple useful signal component and intermodulation item signals；
5) using each useful signal component of software receiver tracking, and related operation is carried out with local signal, with
Obtain the power of each useful signal component；The local signal is consistent with the signal structure of each useful signal component；
6) general power of the multiplexing GNSS signal of the collecting device output terminal is calculated；According to each useful signal point
Measure power and calculate multiplexing efficiency with multiplexing the general power of GNSS signal.
In step s 5, satellite to be measured and its frequency point to be measured are selected first；
Then the satellite to be measured visual time is calculated according to satellite ephemeris；The visual time refers to that satellite to be measured is located at high-gain
The time of directional aerial visual range, for into visual range between moment and the departure time for leaving the visual range
Period；
When satellite to be measured enter more clearly can gathered data visual range when, using gain directional antenna receive penetrate
Frequency signal is simultaneously sent into wide band radio-frequency collecting device progress signal acquisition.Since the elevation angle of satellite to be measured can change, so as to lead
Causing the power of the satellite to be measured can also change.To meet the requirement of the time turnover rate of measurement, acquisition time is unsuitable long, leads to
Acquisition time is arranged to 10 seconds in the case of crossing.Using collecting device output terminals A as reference point in the embodiment of the present invention, respectively
Measurement gathers the general power of the multiplexing GNSS signal of digital intermediate frequency form.In practical application, multiplexing GNSS letters
There are K roads useful signal s1, s2, s3 ... sK in number, obtain the power per road useful signal component.
By the present invention multi-satellite navigation system GNSS signal method of reseptance can receive GPS system C/A code signals,
E1 and the E5 letter of GLONAS system C/A code signals, the thick code signal and galileo satellite navigation system of second generation dipper system
Number.The present invention can be selected by BOC (1, the 1) modulated signals and BPSK modulated signals of two kinds of standards of multi-satellite navigation system
Corresponding pseudo noise code is de-spread.Solve the compatibility of multi-signal structure, the compatibility of multiple systems solution extended code technology, multi-satellite navigation
The problems such as taking into account of the performance of system.Correlator block of the present invention is selecting one satellite of reception to lead multiple satellite navigation systems
Boat system can receive the signal of the multi-satellite of the satellite navigation system at the same time, solve even in complicated reception environment
In, it also can guarantee that the available application of satellite-signal having in the air in limited day more from different system.The present invention carries
The high continuity and reliability of navigator fix, reduces system application risk to greatest extent.Adopted using broadband rf signal
Collect equipment and high quantization bit number, the software receiver of high sampling rate ensure the related power damage that Signal Matching processing procedure introduces
Consume it is extremely low, full matching correlator output extraction available signal power can further suppress noise, interference and channel filtering
The influence of characteristic；By signal-to-noise ratio revise signal general power measured value so as to improve measurement accuracy；It ensure that by above-mentioned measure
Under conditions of signal collected signal-to-noise ratio is higher than 10dB and signal-to-noise ratio (SNR) estimation relative deviation is less than 10%, multiplexing efficiency measurement essence
Degree is better than 1%.
The above is the preferred embodiment of the present invention, it is noted that for those skilled in the art
For, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also considered as
Protection scope of the present invention.
Claims (5)
1. a kind of GNSS signal method of reseptance of multi-satellite navigation system, it is characterised in that comprise the following steps：
S1, receive multi-satellite navigation system digits intermediate-freuqncy signal；
S2, the baseband signal generation based on same frequency complex carrier；
S3, the despreading by the corresponding pseudo noise code of multi-satellite navigation system system selection；
The multiplexing GNSS signal of S4, collection satellite to be measured on frequency point to be measured, to obtain in the multiplexing GNSS signal
Multiple useful signal component and intermodulation item signals；
S5, track each useful signal component using software receiver, and carries out related operation with local signal, to obtain
The power of each useful signal component；The local signal is consistent with the signal structure of each useful signal component；
S6, calculate the collecting device output terminal multiplexing GNSS signal general power, according to each useful signal component
Power and the general power of multiplexing GNSS signal calculate multiplexing efficiency.
2. the GNSS signal method of reseptance of multi-satellite navigation system according to claim 1, it is characterised in that：The step
S1 includes：
S11, set several multisystem correlator channels；
S12, the multi-satellite navigation system digits intermediate-freuqncy signal of input are related via each multisystem is input to after latches
Device passage.
3. the GNSS signal method of reseptance of multi-satellite navigation system according to claim 1, it is characterised in that：The step
S2 includes：
S21, control carrier wave NCO produce the complex carrier with input intermediate-freuqncy signal same frequency；
The complex carrier that S22, carrier wave NCO are produced is multiplied with the digital medium-frequency signal latched, obtains the base band after down-converted
Signal x (n).
4. the GNSS signal method of reseptance of multi-satellite navigation system according to claim 1, it is characterised in that the step
S3 includes the following steps：
S31, control code NCO produce the pulse train with the spreading code same rate of input intermediate-freuqncy signal, while produce and pulse sequence
The same square-wave signal of row cycle phase；
S32, the pseudo-random code generator generation pseudo noise code using programmable configuration compatibility multisystem；
S33, the pulse train produced by step 31, driving pseudo-random code generator produce with input spreading code same rate it is pseudo- with
Machine code sequence, while timing signal is produced, its cycle is equal to the cycle of pseudo-random code sequence；
S34, selection solution extended code formula
Modulation control word is set to the modulated signal of two kinds of systems, by modulation control word come control selections solution extended code formula, is obtained
To solution extended code：
For BOC (1,1) modulated signal, solution extended code formula is multiplied for square-wave signal with pseudo-random code sequence, obtains solution extended code；
For BPSK modulated signals, solution extended code formula is pseudo-random code sequence, and pseudo-random code sequence is directly becoming solution extended code；
S35, the baseband signal that despreading is calculated
It is multiplied by the obtained solution extended code of the baseband signal x (n) and S34 of the generation, the baseband signal de-spread.
5. the GNSS signal method of reseptance of multi-satellite navigation system according to claim 1, it is characterised in that the step
S4 includes the following steps：
The frequency point to be measured of S41, selection satellite to be measured and the satellite to be measured；
S42, according to satellite ephemeris calculate the satellite to be measured visual time；The visual time refers to that satellite to be measured is located at high-gain orientation
The time of antenna visual range, for enter visual range between moment and the departure time for leaving the visual range when
Between section；
S43, when satellite to be measured enters visual range, utilize gain directional antenna collection radiofrequency signal；
S44, send the radiofrequency signal to collecting device, to obtain multiplexing GNSS signal.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110456394A (en) * | 2019-08-08 | 2019-11-15 | 叁晟科华(上海)信息技术有限公司 | GNSS composite strengthening software receives system |
| CN111913201A (en) * | 2020-07-07 | 2020-11-10 | 和芯星通科技(北京)有限公司 | GNSS differential positioning method and device and computer readable storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102096078A (en) * | 2009-12-12 | 2011-06-15 | 杭州中科微电子有限公司 | Multi-satellite navigation system compatible GNSS (Global Navigation Satellite System) signal receiving method and correlator thereof |
| CN106093977A (en) * | 2015-12-07 | 2016-11-09 | 北京航空航天大学 | GNSS signal multiplexing efficiency measuring method based on software receiver |
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2017
- 2017-11-15 CN CN201711132708.2A patent/CN107918137A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102096078A (en) * | 2009-12-12 | 2011-06-15 | 杭州中科微电子有限公司 | Multi-satellite navigation system compatible GNSS (Global Navigation Satellite System) signal receiving method and correlator thereof |
| CN106093977A (en) * | 2015-12-07 | 2016-11-09 | 北京航空航天大学 | GNSS signal multiplexing efficiency measuring method based on software receiver |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110456394A (en) * | 2019-08-08 | 2019-11-15 | 叁晟科华(上海)信息技术有限公司 | GNSS composite strengthening software receives system |
| CN111913201A (en) * | 2020-07-07 | 2020-11-10 | 和芯星通科技(北京)有限公司 | GNSS differential positioning method and device and computer readable storage medium |
| CN111913201B (en) * | 2020-07-07 | 2023-03-14 | 和芯星通科技(北京)有限公司 | GNSS differential positioning method and device and computer readable storage medium |
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Application publication date: 20180417 |