CN108387911A - A kind of GPS tests system - Google Patents
A kind of GPS tests system Download PDFInfo
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- CN108387911A CN108387911A CN201810117776.XA CN201810117776A CN108387911A CN 108387911 A CN108387911 A CN 108387911A CN 201810117776 A CN201810117776 A CN 201810117776A CN 108387911 A CN108387911 A CN 108387911A
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- 238000012360 testing method Methods 0.000 title claims abstract description 61
- 238000001228 spectrum Methods 0.000 claims description 15
- 230000035945 sensitivity Effects 0.000 abstract description 7
- 230000036039 immunity Effects 0.000 abstract description 6
- 238000005259 measurement Methods 0.000 abstract description 4
- 230000007547 defect Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 9
- 238000004088 simulation Methods 0.000 description 8
- 239000000654 additive Substances 0.000 description 6
- 230000000996 additive effect Effects 0.000 description 6
- 238000005562 fading Methods 0.000 description 4
- 238000007689 inspection Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000012956 testing procedure Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/23—Testing, monitoring, correcting or calibrating of receiver elements
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- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Position Fixing By Use Of Radio Waves (AREA)
Abstract
The present invention relates to a kind of GPS to test system, including master control set, the master control set is connected with channel simulator, interference signal source device and GPS signal source device, the interference signal source device connects the channel simulator, the channel simulator and GPS signal source by radio frequency line with GPS signal source device and passes through radio frequency line connecting test terminal.Technical scheme of the present invention provides a kind of GPS tests system, various environment can accurately be simulated, different interference signals is superimposed into the same channel using switch unit, it can intuitively confirm the sensitivity of GPS and the performance of noise immunity, correctly judge the defect of GPS, and this test system is repeatable, accuracy rate and high certainty of measurement, measuring speed is fast, the effective security performance and quality for improving GPS.
Description
Technical field
The present invention relates to a kind of technical fields of communication equipment test more particularly to a kind of GPS to test system.
Background technology
Existing GPS (Global Positioning System) test system uses antenna darkroom or microwave dark room
Test method system, the stationkeeping ability and signal strength of GPS can only be measured under general environment state, because that can not simulate in township
Village, Plain and mountain area area, positioning accuracy, receiving sensitivity under the conditions of Doppler, multipath fading and multi-path jamming,
Positioning time first time of cold start-up thermal starting startup temperature, the performances situation such as noise immunity cannot be to the property of the product of GPS
Comprehensive evaluation can be made and improve the quality of production and performance of GPS.
Invention content
The technical problem to be solved by the present invention is to how provide a kind of GPS tests system, can accurately simulate
Different interference signals is superimposed into the same channel using switch unit, can intuitively confirm the sensitivity of GPS by various environment
And the performance of noise immunity, correctly judge the defect of GPS, and this test system is repeatable, accuracy rate and measurement accuracy
Height, measuring speed is fast, the effective security performance and quality for improving GPS.
The technical solution that the present invention solves above-mentioned technical problem is as follows：
A kind of GPS tests system, including master control set, the master control set are connected with channel simulator, interference signal source
Device and GPS signal source device, the interference signal source device connects the channel simulator with GPS signal source device, described
Channel simulator and GPS signal source connecting test terminal.
Compared with prior art, the beneficial effects of the invention are as follows：Product master control set of the present invention is that system is interacted with the external world
The window of information is controlled and is interacted by the instruction of the special serial ports software realization system on master control set, master control set control
Various environment to be simulated are needed in channel simulator, it is dry that control interference signal source device generates continuous wave, additive white Gaussian noise
It disturbs signal and control GPS signal source generates GPS map signal.
The signal environment and mould of the particular surroundings such as city, rural area, Plain and the mountain area of channel simulator main analog
Intend signal environment under the conditions of Doppler, multipath fading and multi-path jamming, simulation GPS is being interfered in high velocity environment and in many ways
Use in environment；Interference signal source provides the continuous wave of some strength, additive white Gaussian noise interference signal；GPS signal source
Device generates GPS signal in shielding test cabinet.
Based on the above technical solution, the present invention can also be improved as follows：
Further, the master control set is 2, one of them described master control set connecting channel simulator and interference are believed
Number source device, another described master control set connect GPS signal source device.
Advantageous effect using above-mentioned further scheme is：Convenient for passing through the special serial ports software realization system of master control set
Instruction control with interact, convenient for tester differentiation control interference signal source device, GPS signal source device.
Further, the interference signal source device and GPS signal source device pass through switch unit and the channel simulation
Device connects.
Advantageous effect using above-mentioned further scheme is：Switch unit acts on set two-way either multiple signals
Emit from same link, can also by multichannel or single signal by the control of switch from a link transmissions, for that will interfere
The GPS signal that the interference signal and GPS signal source device that signal source device is sent out are sent out emits from same link.
Further, the switch unit is the integrated switch unit for integrating combiner and power splitter.
Advantageous effect using above-mentioned further scheme is：Realize the effect of switch unit aggregate signal.
Further, the interference signal source device and GPS signal source device are connected separately with spectrum analyzer.
Advantageous effect using above-mentioned further scheme is：Interference signal source device connects spectrum analyzer inspection interference letter
Whether the signal frequency that number source device is sent out, signal strength are correct；GPS signal source device is separately connected spectrum analyzer inspection
Whether GSP signal frequencies, signal strength are correct.
Further, the channel simulator is connect by serial ports with the master control set.
Advantageous effect using above-mentioned further scheme is：Convenient for the connection of channel simulator and the master control set.
Further, the GPS signal source device is E4438C signal generators.
Advantageous effect using above-mentioned further scheme is：There is provided the digital modulation of analog-modulated, with excellent level
Precision and the purity of frequency spectrum.
Further, the interference signal source device is E8257D signal generators.
Advantageous effect using above-mentioned further scheme is：With better output power, level accuracy and it is up to
The phase noise performance of 67GHz, the high-output power having and excellent level accuracy, without installing test high-power equipment
External amplifier.
Description of the drawings
Fig. 1 is product structure figure of the present invention.
In attached drawing, parts list represented by the reference numerals are as follows：
1, master control set, 2, channel simulator, 3, interference signal source device, 4, GPS signal source device, 5, test terminal,
6, switch unit, 7, spectrum analyzer.
Specific implementation mode
The principle and features of the present invention will be described below with reference to the accompanying drawings, and the given examples are served only to explain the present invention, and
It is non-to be used to limit the scope of the present invention.
As shown in Figure 1, a kind of GPS tests system, including master control set 1, the master control set 1 are connected with channel simulator
2, interference signal source device 3 and GPS signal source device 4, the interference signal source device 3 and GPS signal source device 4 connect described
Channel simulator 2, the channel simulator 2 and GPS signal source connecting test terminal 5.
Product master control set 1 of the present invention is the window of system and extraneous interactive information, passes through the special string on master control set 1
The instruction of mouth software realization system is controlled and is interacted, and various environment to be simulated are needed in 1 control channel simulator 2 of master control set,
It controls interference signal source device 3 and generates continuous wave, additive white Gaussian noise interference signal and control GPS signal source generation GPS
Map signal.
The signal environment of the particular surroundings such as city, rural area, Plain and the mountain of 2 main analog of channel simulator and simulation
Signal environment under the conditions of Doppler, multipath fading and multi-path jamming, simulation GPS is in high velocity environment and in interference ring in many ways
Use in border；Interference signal source provides the continuous wave of some strength, additive white Gaussian noise interference signal；GPS signal source fills
It sets 4 and generates GPS signal in shielding test cabinet.
Preferably, the master control set 1 is 2, one of them 1 connecting channel simulator 2 of the master control set and interference
Signal source device 3, another described master control set 1 connect GPS signal source device 4.Convenient for passing through the special serial ports of master control set 1
The instruction of software realization system is controlled and is interacted, and control interference signal source device 3, GPS signal source dress are distinguished convenient for tester
Set 4.
Preferably, the interference signal source device 3 and GPS signal source device 4 pass through switch unit 6 and the channel simulation
Device 2 connects.The set two-way either multiple signals that act on of switch unit 6 emit from same link, can also by multichannel or
Single signal by the control of switch from a link transmissions, the interference signal for sending out interference signal source device 3 and GPS
The GPS signal that signal source device 4 is sent out emits from same link.
Preferably, the switch unit 6 is the integrated switch unit 6 for integrating combiner and power splitter.Realize switch
The effect of 6 aggregate signal of unit.
Preferably, the interference signal source device 3 and GPS signal source device 4 are connected separately with spectrum analyzer 7.Interference
Signal source device 3 connects spectrum analyzer 7 and checks whether the signal frequency that interference signal source device 3 is sent out, signal strength are correct；
GPS signal source device 4 is separately connected spectrum analyzer 7 and checks whether GSP signal frequencies, signal strength are correct.
Preferably, the channel simulator 2 is connect by serial ports with the master control set 1.Convenient for channel simulator 2 and institute
State the connection of master control set 1.
Preferably, the GPS signal source device 4 is E4438C signal generators.Digital modulation, the tool of analog-modulated are provided
There are excellent level accuracy and the purity of frequency spectrum.
Preferably, the interference signal source device 3 is E8257D signal generators.With better output power, level
The phase noise performance of precision and up to 67GHz, the high-output power having and excellent level accuracy, without installing test
The external amplifier of high-power equipment.
GPS is a kind of very common global positioning system, and general civilian GPS uses the L1 carrier waves of GPS system, frequency
For 1575.42MHz, then general GPS satellite, on 10,000 2 thousand kilometers of high-altitude from the ground, 24 satellites were with 12 hours periods
It orbits round the earth so that at any time, any point on the ground can observe 4 or more satellites simultaneously,
GPS in this way can effectively carry out 2D (plane map), 3D (relief map) positioning.
In the preferred embodiment of the present invention, positioning accuracy, the receiving sensitivity of GPS, cold start-up thermal starting Wen Qi can be tested
Dynamic TTFF (positioning time first time), noise immunity；Especially receiving sensitivity and noise immunity are verified, GPS is surveyed
Examination terminal 5 makes comprehensive performance evaluation.
The course of work tested GPS tests terminal 5 using this test system is as follows：
Signal where shielding the test system outside test cabinet ensures that testing indoor signal source comes solely from the test system
Each device of system.
Positioning accuracy, the receiving sensitivity of GPS, the test process of the TTFF of cold start-up thermal starting startup temperature：
1) 1 control channel simulator 2 of master control set, combination is used to build environment, simulation GPS is on rural area, Plain and mountain
The signal condition of the particular surroundings such as area area, test under the conditions of Doppler, multipath fading and multi-path jamming ensure signal
Signal during the test, when the intensity of each signal is -100 to -120dbm, is passed through channel simulation by source, interference source
Device 2 is then transmit to GPS test terminals 5.
2) it uses master control set 1 that two groups of different maps of GPS signal source device 4 are set, satellite number and ground is set
Height above sea level, longitude, latitude in figure.
3) GPS tests terminal 5 is connected to GPS signal source device 4, signal can normally be accessed by checking whether, and be used
Spectrum analyzer 7 checks the accuracy of confirmation signal, after inspection, disconnects the company of test terminal 5 and GPS signal source device 4
It connects.
4) master control set 1 controls GPS signal source device 4 by the serial ports that signal source device connects and generates signal, passes through master
It controls device 1 and confirms whether the GPS signal of transmitting is correct, allows signal to emit immediately after correct judgment, simultaneous selection satellite number is simultaneously
Confirm, the satellite map in selection signal source generates effective GPS signal.
5) after opening the useful GPS signal that GPS signal source device 4 is sent out, setting is about strong in the signal of -100dBm sizes
Degree, in case the excessive GPS of signal strength of setting cannot be positioned.
6) spectrum analyzer 7 is accessed in the GPS signal source for sending out GPS signal source device 4, checks the frequency and letter of signal
Whether number intensity is accurate.
7) GPS is tested into 5 connecting channel simulator 2 of terminal, starts test terminal 5 and positioned, signal is passed through into switch
Unit 6 is transmitted to channel simulator 2.
8) connection GPS test terminal 5 tested and recorded simulation distinctive signal environment GPS 2D positioning times,
GPS 3D positioning times, unlike signal strength test when, must restart GPS.
GPS tests terminal 5 is fully powered off, after restarting switching use geographic survey positioning time, when this measurement
Between data be cold start-up TTFF (positioning time first time)；
In position fixing process, directly GPS tests terminal 5 is restarted, then the measurement and positioning time, this positioning time number
According to being thermal starting TTFF (positioning time first time)；
9) longitude, latitude and height above sea level of positioning, comparison GPS signal source device 4 are read in GPS test terminals 5
Practical longitude, latitude and the height above sea level of middle map obtain the positioning accuracy of test terminal 5.
10) after positioning is completed, the signal of GPS signal source device 4 is continuously decreased using 1dbm as step-length, until GPS is surveyed
Until examination terminal 5 cannot receive the signal that signal source device is sent out, the signal strength of GPS signal source device 4 is recorded, this letter
Number intensity, that is, final receiving sensitivity.
11) interference signal source device 3 is opened, the interference signal of identical frequency is set, and set interference signal intensity to-
71dbm, access spectrum analyzer 7 detect the accuracy of the frequency of signal and the intensity of signal, and interference signal is single by switching
The signal combining input channel simulator 2 of member 6 and GPS signal source device 4 sent out.
12) test terminal 5 is connected to channel simulator 2, repeat 8) to the testing procedure of 10) step, comparison plus interference source and
It is not added with the height above sea level of interference source searched out in satellite number and map, the test result of longitude, latitude, obtains test data.
The test process of noise immunity test：
1) using master control set 1 to control, interference signal source device 3 emits continuous wave signal source and additive white Gaussian noise is dry
Signal is disturbed, the frequency of interference source signal and the accuracy of signal strength are checked using spectrum analyzer 7.
2) GPS signal source device 4 is opened, shutdown signal interferes the interference signal of source device, is examined using spectrum analyzer 7
Look into the signal frequency of the signal source of GPS signal source device 4 and the accuracy of signal strength.
3) switch unit 6 is used to connect signal source, interference source, another end in contact radio frequency line of combining is connected to channel mould
On quasi- device 2, GPS tests terminal 5 is connected to by radio frequency line on channel simulator 2.
4) GPS test terminals 5 are opened and complete 3D positioning, opening signal interferes the interference signal of source device, interference source is believed
Number frequency modulation(PFM) to 1574.42MHz.
5) in the case where analog signal is constant, continuous wave CO_2 laser signal is set to identical frequency and power respectively, so
Interference signal is gradually increased with the amplitude of 1dBm afterwards, the intensity of interference signal GPS when much is detected and tests terminal 5 and lose
Navigator fix.It sets additive white Gaussian noise interference signal to identical frequency and power again, carries out identical operation, and record
The signal strength of lower interference source, this intensity are exactly the GPS test receptible signal strengths to greatest extent of terminal 5.
Test system through the invention can examine the usability of GPS test terminals 5 various conditions outdoors indoors
Energy and interference free performance, improve benefit conscientiously；Cost is reduced, and can ensure the consistency of test, validity, most
It is important that ging wrong in preoperation inspection, it is ensured that GPS tests the safety of terminal 5 in use.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all the present invention spirit and
Within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention.
Claims (8)
1. a kind of GPS tests system, which is characterized in that including master control set (1), the master control set (1) is connected with channel mould
Quasi- device (2), interference signal source device (3) and GPS signal source device (4), the interference signal source device (3) and GPS signal source
Device (4) connects the channel simulator (2) by radio frequency line, and the channel simulator (2) and GPS signal source pass through radio frequency line
Connecting test terminal (5).
2. a kind of GPS according to claim 1 tests system, which is characterized in that the master control set (1) is 2, wherein
One master control set (1) connecting channel simulator (2) and interference signal source device (3), another described master control set (1)
Connect GPS signal source device (4).
3. a kind of GPS according to claim 1 tests system, which is characterized in that the interference signal source device (3) and
GPS signal source device (4) is connect by switch unit (6) with the channel simulator (2).
4. a kind of GPS according to claim 3 tests system, which is characterized in that the switch unit (6) is collection combiner
The integrated switch unit being integrated with power splitter.
5. testing system according to a kind of GPS of claim 1-4 any one of them, which is characterized in that the interference signal source dress
It sets (3) and GPS signal source device (4) is connected separately with spectrum analyzer (7).
6. a kind of GPS according to claim 1 tests system, which is characterized in that the channel simulator (2) passes through serial ports
It is connect with the master control set (1).
7. a kind of GPS according to claim 1 tests system, which is characterized in that the GPS signal source device (4) is
E4438C signal generators.
8. a kind of GPS according to claim 1 tests system, which is characterized in that the interference signal source device (3) is
E8257D signal generators.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810117776.XA CN108387911B (en) | 2018-02-06 | 2018-02-06 | GPS test system |
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| CN201810117776.XA CN108387911B (en) | 2018-02-06 | 2018-02-06 | GPS test system |
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| CN108387911B CN108387911B (en) | 2024-03-19 |
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Cited By (4)
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| CN109788112A (en) * | 2019-02-25 | 2019-05-21 | 深圳市摩尔环宇通信技术有限公司 | 5G terminal noise immunity test method and system and equipment |
| CN111522257A (en) * | 2020-05-08 | 2020-08-11 | 安徽江淮汽车集团股份有限公司 | Vehicle positioning test method, device, equipment and storage medium |
| CN111929710A (en) * | 2020-06-30 | 2020-11-13 | 中国科学院国家授时中心 | Delivery test method for Beidou satellite navigation signal quality assessment |
| CN113687391A (en) * | 2021-09-13 | 2021-11-23 | 中国信息通信研究院 | Method and device for rapidly testing satellite navigation positioning performance of wireless terminal |
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| CN111929710A (en) * | 2020-06-30 | 2020-11-13 | 中国科学院国家授时中心 | Delivery test method for Beidou satellite navigation signal quality assessment |
| CN113687391A (en) * | 2021-09-13 | 2021-11-23 | 中国信息通信研究院 | Method and device for rapidly testing satellite navigation positioning performance of wireless terminal |
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| Publication number | Publication date |
|---|---|
| CN108387911B (en) | 2024-03-19 |
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