CN105005067A - Simulation speed measurement detection system and method of motor vehicle GNSS speedometer - Google Patents

Simulation speed measurement detection system and method of motor vehicle GNSS speedometer Download PDF

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Publication number
CN105005067A
CN105005067A CN201510373684.4A CN201510373684A CN105005067A CN 105005067 A CN105005067 A CN 105005067A CN 201510373684 A CN201510373684 A CN 201510373684A CN 105005067 A CN105005067 A CN 105005067A
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China
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gnss
signal
motor vehicle
knotmeter
satellite
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孙桥
白银
杜磊
白杰
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National Institute of Metrology
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National Institute of Metrology
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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
    • G01S19/38—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system
    • G01S19/39—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system the satellite radio beacon positioning system transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/52—Determining velocity

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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 invention provides a simulation speed measurement detection system and method of a motor vehicle GNSS speedometer and belongs to the metering and measuring field. The system comprises a control computer, a GNSS signal simulator, a satellite signal field simulator and a high-precision motor vehicle GNSS speedometer to be detected. The control computer generates a simulation signal, transmits the simulation signal to the GNSS signal simulator, controls the working states of the GNSS signal simulator and the satellite signal field simulator, receives and records feedback signals of the GNSS signal simulator and the high-precision motor vehicle GNSS speedometer to be detected, and calculates a detection result. The control signal input port of the GNSS signal simulator is connected with the control computer. The GNSS signal simulator generates a corresponding satellite signal according to the simulation signal generated by the control computer.

Description

A kind of simulation of motor vehicle GNSS knotmeter is tested the speed detection system and method
Technical field
The invention belongs to measurement field, the simulation being specifically related to a kind of motor vehicle GNSS knotmeter is tested the speed detection system and method.
Background technology
Navigate along with the generation of human society politics, economy and military activity and produce, development.The mixture based on terrestrial radio navigation system that World War II and post hostilities period are formed has made huge contribution to the prosperity of human society with progressive.The autonomic navigation system come into operation after the sixties has militarily done important supplementing to based Wireless Navigation.Along with the development of world economy and the change of military combat mode, the basis of Information Technology Development at the end of the seventies is formed and the new navigational system mixture come into operation successively, take satellite navigation system as core, scope of heading, precision and other performance are brought up to a new height, greatly facilitate the development of dual-use navigation cause, also make the effect of navigation expand to the various aspects of social life.Current each state, all at develop actively navigational satellite system, comprises GPS of America, Russian Federation GLONASS, the Galileo system of European Union and the Beidou satellite navigation system etc. of China.
Have demand widely to the accurate measurement of speed in a lot of field, comprise the check and evaluation of military aircraft, GPS and inertial navigation system integrated, gravity field is measured, geophysical survey etc.Utilize the navigational satellite system velocimetry of receiver Doppler and carrier phase measurement can obtain the moving object velocity amplitude of high precision, high reliability cost-effectively.Motor vehicle speed measuring is at present based on the primary commercial market of the knotmeter of Navsat principle.Wherein, the high precision motor vehicle GNSS standard knotmeter that metrological service uses is used to carry out on-the-spot proving ground test comprehensive detection to the motor vehicle speed measuring system be arranged on highway (radar velocity measurement system, ground sensing coil velocity measurement system, laser velocimeter system etc.), the specialized instrument and equipment of calibration speed value, also can be used for the measurement of distance travelled.High precision motor vehicle GNSS knotmeter due to its rate accuracy high, require lower to weather environment, and simple installation, more and more be used as the standard instruments of work implement level automobile velocimeter calibration, but different Navsat positioning systems has different satellite spatial structures and data type, the measurement technology research that current China tests the speed to Navsat positioning system is relatively less, in metering method and the technical elements still blank of the knotmeter based on Navsat principle.Perfect gradually along with the autonomous big-dipper satellite positioning system of China, and the military demand tested the speed of China, also manifest gradually to the metering requirements that the Big Dipper tests the speed.Therefore more and more urgent to the Research Requirements of motor vehicle GNSS standard knotmeter detection technique.
In measurement field, in order to guaranteed discharge primary system one or measure accurately and reliably, carrying out detection to the range rate error of high precision motor vehicle GNSS knotmeter detection method is an important process.At present, the detection method of high precision motor vehicle GNSS knotmeter has site road Comparability test method and laboratory playback signal detection method, mainly for be all the detection of GPS knotmeter.Such as, high precision vehicle GPS velocimeter is classified as the reference instrument of automobile velocimeter type evaluation test by Britain, the detection of its speed index relies on the site road Comparability test of specific speed point, and the comparison utensil of use is non-contact speed measurement instrument and similar high precision vehicle GPS velocimeter.
Laboratory playback signal detects, and adopts three light beam radical occlusion device acquisition test cars to travel the standard speed produced, and records and the corresponding satellite-signal of playback apparatus record with gps signal, standard speed value is carried out to the playback of gps signal in laboratory.Use the method high precision vehicle GPS velocimeter is detected, by its testing principle, can directly trace to the source in theory to time/length fundamental quantity.The high precision vehicle GPS velocimeter that can normally work generally is no more than ± 0.1%. according to the speed index testing result of the method and the deviation of standard speed value
But described prior art has the following disadvantages:
(1) in prior art, site road Comparability test method is tested at every turn, all need test site, test vehicle and environmental baseline, staffing proposition high requirement, although can detect it by the actual working state of knotmeter, the detection of same speed point measuring repeatability cannot be realized.Further, as the non-contact speed measurement instrument of comparison utensil, the impact of various field practical factor can be subject in actual road test process, its velocity survey index and approach of tracing to the source, not obtain generally acknowledging of motor vehicle speed measuring international metering field;
(2) light shading type standard knotmeter and gps signal recording/playback instrument is utilized to detect high precision vehicle GPS velocimeter in prior art, have employed the detection method of Site Detection Binding experiment room satellite-signal playback, the method contains the adverse effect produced gps satellite signal from factors such as satellite, air, site environments, comparatively close with the actual use measuring state of high precision vehicle GPS velocimeter, but satellite-signal recording process is comparatively complicated, high to the requirement of experiment condition, and uncertainty of measurement is larger.Therefore, the prior art is subject to larger restriction when applying.In addition, the method existed at present all only detects for GPS knotmeter, can yet there are no open report for the method using the knotmeter of other GNSS system to carry out detecting.
In sum, in prior art, site road Comparability test method cannot detect measuring repeatability, and the signal recording process of satellite-signal playback speed detection method is comparatively complicated, higher to the requirement of experiment condition, be difficult to popularity in high precision vehicle GPS velocimeter gauge check industry.And said method comprehensively cannot detect existing all GNSS system, cannot meet the requirement of technical progress.
Summary of the invention
The object of the invention is to solve the difficult problem existed in above-mentioned prior art, provide a kind of simulation of motor vehicle GNSS knotmeter to test the speed detection system and method, to realize carrying out convenient, fast and accurate test in laboratory method to motor vehicle GNSS knotmeter.
The present invention is achieved by the following technical solutions:
The simulation of motor vehicle GNSS knotmeter is tested the speed a detection system, comprises computer for controlling, GNSS signal simulator, satellite-signal field stimulation device and tested high precision motor vehicle GNSS knotmeter;
Described computer for controlling produces simulating signal, and by analog signal transmission to GNSS signal simulator, control the duty of GNSS signal simulator and satellite-signal field stimulation device, receive simultaneously and record the feedback signal of GNSS signal simulator and tested high precision motor vehicle GNSS knotmeter, and calculate testing result;
The control signal input port of described GNSS signal simulator is connected with computer for controlling, and GNSS signal simulator generates corresponding satellite-signal according to the simulating signal that computer for controlling produces;
The signal output port of described GNSS signal simulator is connected with satellite-signal field stimulation device, and the satellite signal transit that GNSS signal simulator is produced is to satellite-signal field stimulation device;
The satellite signal receiving antenna of described tested high precision motor vehicle GNSS knotmeter is connected with satellite-signal field stimulation device.
Described satellite-signal field stimulation device comprises body, emission of radio frequency signals device and salable hatch door;
Described body is rectangular pyramid shape microwave dark room structure, adopts metal material, wall is provided with absorbing material within it;
The signal transmitting terminal of described emission of radio frequency signals device is arranged on the inside, top of body, for launching the satellite-signal that GNSS signal simulator sends;
The signal access port of described radio-frequency (RF) transmitter in the tip exterior of body, for receiving the satellite-signal that GNSS signal simulator sends;
That is, the emission of radio frequency signals device one end on satellite-signal field stimulation device top receives the satellite-signal that GNSS signal simulator sends, and the other end is launched simulation satellite signal again.
Have salable hatch door at the sidewall of body, by this salable hatch door, the satellite signal receiving antenna of tested high precision motor vehicle GNSS knotmeter is placed in the center of inside position of body.
The satellite signal receiving antenna of described tested high precision motor vehicle GNSS knotmeter comprises aerial head and connecting line, described aerial head is placed in satellite-signal field stimulation device, one end of connecting line is connected with described aerial head, and the other end is connected with the antennal interface on tested high precision motor vehicle GNSS knotmeter.
Described computer for controlling is provided with hard disk, and GNSS signal simulator data recordin module and tested high precision motor vehicle GNSS knotmeter data recordin module are installed;
Described GNSS signal simulator data recordin module is used for the analog rate v of actual for GNSS signal simulator generation 0be recorded on computer for controlling hard disk;
Described tested high precision motor vehicle GNSS knotmeter data recordin module is used for the velocity amplitude v recorded by tested high precision motor vehicle GNSS knotmeter ibe recorded on computer for controlling hard disk.
Described computer for controlling is provided with computing unit, its velocity amplitude v recorded according to tested high precision motor vehicle GNSS knotmeter icalculate the average speed value v that tested high precision motor vehicle GNSS knotmeter records, subsequently according to the analog rate v that GNSS signal simulator produces 0with the average speed value v that tested high precision motor vehicle GNSS knotmeter records, calculate and obtain range rate error Δ v and velocity survey repeatability σ.
Utilize the simulation of described motor vehicle GNSS knotmeter a to test the speed method that detection system carries out detecting, described method comprises:
Described computer for controlling defines the longitude and latitude of the reference position of simulated moving object, direction of motion, movement velocity and run duration, then produces simulating signal;
Described computer for controlling controls the duty of GNSS signal simulator and satellite-signal field stimulation device, uses described tested high precision motor vehicle GNSS knotmeter to carry out velocity survey continuously;
In measuring process, the analog rate v that record GNSS signal simulator produces 0with the velocity amplitude v that tested high precision motor vehicle GNSS knotmeter records i, then according to the analog rate v that GNSS signal simulator produces 0with the average speed value v that the tested high precision motor vehicle GNSS knotmeter calculated records, calculate and obtain range rate error Δ v and velocity survey repeatability σ.
Described duty comprises beginning analog detection and stops analog detection two states.
The described tested high precision motor vehicle GNSS knotmeter of described use carries out velocity survey continuously and is achieved in that the simulation satellite signal that described tested high precision motor vehicle GNSS knotmeter receiving satellite signal field stimulation device sends, and is calculated the movement velocity of simulation therein by least square method according to the Doppler shift of simulation satellite signal.
The described analog rate v produced according to GNSS signal simulator 0with the average speed value v that the tested high precision motor vehicle GNSS knotmeter calculated records, calculating obtains range rate error Δ v and velocity survey repeatability σ is achieved in that
Adopt formulae discovery range rate error Δ v below:
Δ v = v - v 0 v 0 × 100 % ;
According to detection demand, carry out the test of multiple signal analog detection continuously, the average speed value at every turn obtained is v j, adopt the velocity survey repeatability σ of formulae discovery tested high precision motor vehicle GNSS knotmeter below:
σ = 1 n - 1 Σ j = 1 n ( v j - v ) 2
In formula, n is pendulous frequency.
Compared with prior art, the invention has the beneficial effects as follows: the present invention relies on simulation GNSS signal to be transmission of quantity value object, the detection of the crucial measuring indexs such as high precision motor vehicle GNSS speedometer error, measuring repeatability is completed in laboratory, improve the accurate reliability of measurement result, decrease the site test car high-speed test (HST) of loaded down with trivial details danger, convenient feasible, and improve work efficiency, be easy to apply.
Accompanying drawing explanation
The simulation of Fig. 1 motor vehicle GNSS of the present invention knotmeter is tested the speed the composition structural representation of detection system.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail:
A kind of simulation of motor vehicle GNSS knotmeter is tested the speed detection system, as shown in Figure 1, comprise GNSS simulating signal making software platform, the computing machine 1 of software running platform and data logging software and computing unit, GNSS signal simulator 2, satellite-signal field stimulation device 3 and tested high precision motor vehicle GNSS knotmeter 4 are installed.
Computing machine 1 is responsible for producing corresponding simulated data according to the definition of step (1) and transferring to GNSS signal simulator 2, receive simultaneously and record the feedback signal of GNSS signal simulator 2 and tested high precision motor vehicle GNSS knotmeter 4, and carried out the calculating of testing result by computing unit.
Satellite-signal field stimulation device 3 is customization, and according to the shape of satellite-signal field, customized inner whole covering absorbing material, outside is the rectangular pyramid shape microwave dark room of metal construction.Emission of radio frequency signals device is equipped with on this top, darkroom, and sidewall has sealable opening gps antenna to be placed in center of inside position, darkroom.
Method that detection system carries out detecting comprises the following steps to utilize the simulation of described motor vehicle GNSS knotmeter to test the speed:
(1) movement locus simulation softward is worked out
(2) simulation of laboratory GNSS signal and detection experiment
In step (1), described computing machine is installed GNSS signal analog platform and (adopts existing business software, the SatGen software that such as Racelogic company produces and the Positioning Application that Spirent company produces), work out on the platform and generate movement locus simulation softward.In this software programming process, according to reality test needs to the reference position longitude and latitude of simulated moving object, direction of motion, movement velocity and run duration etc. carry out defining (such as: reference position longitude and latitude is defined as north latitude 37.441 degree, east longitude 122.143 degree, first motion direction is along north latitude 90 degree, keep rectilinear motion, movement velocity changes from 5km/h to 250km/h, each speed maintains 20 seconds, and next speed was promoted in 5 seconds, at the end of final test, speed reduced to 0 in 20 seconds), to the file write, (file write is common text files subsequently, directly can open at compiling platform and compile) carry out compiling generation simulation softward.
In step (2), the control signal input port of described GNSS signal simulator 2 is connected with computer for controlling 1, the simulating signal that the simulation softward that GNSS signal simulator 2 generates according to step (1) produces generates corresponding satellite-signal, its radio frequency output port is connected with the emission of radio frequency signals device receiving port of taper satellite-signal field stimulation device 3 tip exterior, and by the satellite signal transit that produces to the emitter of inside, taper satellite-signal field stimulation device 3 top.The aerial head of the satellite signal receiving antenna of described tested high precision motor vehicle GNSS knotmeter 4 is placed in satellite-signal field stimulation device 3 by the salable hatch door of taper satellite-signal field stimulation device 3 side that (this antenna is connected by cable with 4.Receiving antenna comprises aerial head and connecting line, and the connecting line other end can be connected with the antennal interface on 4 main frames.), and the salable hatch door of taper satellite-signal field stimulation device is closed, utilize control software design to control GNSS signal simulator 2, (duty only comprises beginning analog detection and stops analog detection two kinds the duty of satellite-signal field stimulation device 3.), velocity survey (the simulation satellite signal that tested GNSS knotmeter 4 receiving satellite signal field stimulation device 3 sends, and calculated the movement velocity of simulation according to the Doppler shift of satellite-signal therein by least square method is carried out continuously with described tested GNSS knotmeter 4.), (movement velocity recorded here is the definition according to step (1) to the analog rate that in measuring process, GNSS signal simulator 2 produces, the skimulated motion velocity amplitude that simulator 2 produces in step (2) reality.) and the test data of GNSS knotmeter 4 simultaneously at the enterprising line item of the hard disk of computer for controlling 1; The computing unit software that computer for controlling 1 is installed calculates testing result immediately, and the analog rate that GNSS signal simulator 2 produces is v 0, the average speed value that tested high precision motor vehicle GNSS knotmeter records is v, then range rate error Δ v is:
Δ v = v - v 0 v 0 × 100 % ;
According to detection demand, carry out the test of multiple signal analog detection continuously, the average speed value at every turn obtained is v j, adopt the velocity survey repeatability σ of formulae discovery tested high precision motor vehicle GNSS knotmeter below:
σ = 1 n - 1 Σ j = 1 n ( v j - v ) 2
In formula, n is pendulous frequency.
Above-mentioned calculating is the data handling procedure of being undertaken by computing unit after obtaining data.
Specifically, in the method, described control module is the computing machine 1 being provided with simulation softward compiling platform, operation platform and computing unit software; Described GNSS signal simulator 2 is to produce simulation satellite signal according to the input of control module and to export, and can use the GNSS signal simulator of hard disk recording signal data; Described satellite-signal field stimulation device 3 be top with sender unit, side is with the rectangular pyramid shape microwave dark room of salable hatch door.
The embodiment of the inventive method is as follows:
Embodiment 1:
The present embodiment detects high precision vehicle GPS velocimeter range rate error.Establishment simulation softward continuously to 40km/h, 60km/h, 80km/h, 100km/h, 120km/h, 140km/h, 160km/h, 180km/h totally 8 speed points repeatedly simulate, tested motor vehicle GNSS knotmeter carries out velocity survey continuously.Simulation softward and tested motor vehicle GNSS knotmeter difference writing speed data simultaneously, the data according to record calculate range rate error, and when computing method are for being not more than 50km/h, calculate absolute error, unit is km/h; When being greater than 50km/h, calculate relative error, unit is %.Simulation range rate error testing result is as shown in table 1:
Table 1
In this embodiment, tested motor vehicle GNSS knotmeter is not more than 0.1km/h or 0.1% in the measuring error of friction speed point.
Embodiment 2:
The present embodiment detects high precision vehicle GPS velocimeter velocity survey repeatability.Adopt the simulation softward of establishment in example 1, continuously to 40km/h, 60km/h, 80km/h, 100km/h, 120km/h, 140km/h, 160km/h, 180km/h totally 8 speed points repeatedly simulate, tested motor vehicle GNSS knotmeter carries out velocity survey continuously.Simulation softward and tested motor vehicle GNSS knotmeter difference writing speed data simultaneously, the data according to record calculate reproducibility error, and when computing method are for being not more than 50km/h, calculate absolute error, unit is km/h; When being greater than 50km/h, calculate relative error, unit is %.Reproducibility error testing result is as shown in table 2:
Table 2
In this embodiment, tested motor vehicle GNSS knotmeter is not more than 0.25km/h or 0.25% in the measuring error of friction speed point.
Technique scheme is one embodiment of the present invention, for those skilled in the art, on the basis that the invention discloses application process and principle, be easy to make various types of improvement or distortion, and the method be not limited only to described by the above-mentioned embodiment of the present invention, therefore previously described mode is just preferred, and does not have restrictive meaning.

Claims (9)

1. the simulation of motor vehicle GNSS knotmeter is tested the speed a detection system, it is characterized in that: the simulation of the described motor vehicle GNSS knotmeter detection system that tests the speed comprises computer for controlling, GNSS signal simulator, satellite-signal field stimulation device and tested high precision motor vehicle GNSS knotmeter;
Described computer for controlling produces simulating signal, and by analog signal transmission to GNSS signal simulator, control the duty of GNSS signal simulator and satellite-signal field stimulation device, receive simultaneously and record the feedback signal of GNSS signal simulator and tested high precision motor vehicle GNSS knotmeter, and calculate testing result;
The control signal input port of described GNSS signal simulator is connected with computer for controlling, and GNSS signal simulator generates corresponding satellite-signal according to the simulating signal that computer for controlling produces;
The signal output port of described GNSS signal simulator is connected with satellite-signal field stimulation device, and the satellite signal transit that GNSS signal simulator is produced is to satellite-signal field stimulation device;
The satellite signal receiving antenna of described tested high precision motor vehicle GNSS knotmeter is connected with satellite-signal field stimulation device.
2. the simulation of motor vehicle GNSS knotmeter according to claim 1 is tested the speed detection system, it is characterized in that: described satellite-signal field stimulation device comprises body, emission of radio frequency signals device and salable hatch door;
Described body is rectangular pyramid shape microwave dark room structure, adopts metal material, wall is provided with absorbing material within it;
The signal transmitting terminal of described emission of radio frequency signals device is arranged on the inside, top of body, for launching the satellite-signal that GNSS signal simulator sends;
The signal access port of described radio-frequency (RF) transmitter in the tip exterior of body, for receiving the satellite-signal that GNSS signal simulator sends;
Have salable hatch door at the sidewall of body, by this salable hatch door, the satellite signal receiving antenna of tested high precision motor vehicle GNSS knotmeter is placed in the center of inside position of body.
3. the simulation of motor vehicle GNSS knotmeter according to claim 2 is tested the speed detection system, it is characterized in that: the satellite signal receiving antenna of described tested high precision motor vehicle GNSS knotmeter comprises aerial head and connecting line, described aerial head is placed in satellite-signal field stimulation device, one end of connecting line is connected with described aerial head, and the other end is connected with the antennal interface on tested high precision motor vehicle GNSS knotmeter.
4. the simulation of motor vehicle GNSS knotmeter according to claim 3 is tested the speed detection system, it is characterized in that: on described computer for controlling, be provided with hard disk, and GNSS signal simulator data recordin module and tested high precision motor vehicle GNSS knotmeter data recordin module are installed;
Described GNSS signal simulator data recordin module is used for the analog rate v of actual for GNSS signal simulator generation 0be recorded on computer for controlling hard disk;
Described tested high precision motor vehicle GNSS knotmeter data recordin module is used for the velocity amplitude v recorded by tested high precision motor vehicle GNSS knotmeter ibe recorded on computer for controlling hard disk.
5. the simulation of motor vehicle GNSS knotmeter according to claim 4 is tested the speed detection system, it is characterized in that: on described computer for controlling, be provided with computing unit, its velocity amplitude v recorded according to tested high precision motor vehicle GNSS knotmeter icalculate the average speed value v that tested high precision motor vehicle GNSS knotmeter records, subsequently according to the analog rate v that GNSS signal simulator produces 0with the average speed value v that tested high precision motor vehicle GNSS knotmeter records, calculate and obtain range rate error and velocity survey repeatability σ.
6. utilize the simulation of the arbitrary described motor vehicle GNSS knotmeter of claim 1-5 a to test the speed method that detection system carries out detecting, described method comprises:
Described computer for controlling defines the longitude and latitude of the reference position of simulated moving object, direction of motion, movement velocity and run duration, then produces simulating signal;
Described computer for controlling controls the duty of GNSS signal simulator and satellite-signal field stimulation device, uses described tested high precision motor vehicle GNSS knotmeter to carry out velocity survey continuously;
In measuring process, the analog rate v that record GNSS signal simulator produces 0with the velocity amplitude v that tested high precision motor vehicle GNSS knotmeter records i, then according to the analog rate v that GNSS signal simulator produces 0with the average speed value v that the tested high precision motor vehicle GNSS knotmeter calculated records, calculate and obtain range rate error and velocity survey repeatability σ.
7. method according to claim 6, is characterized in that: described duty comprises beginning analog detection and stops analog detection two states.
8. method according to claim 7, it is characterized in that: the described tested high precision motor vehicle GNSS knotmeter of described use carries out velocity survey continuously and is achieved in that the simulation satellite signal that described tested high precision motor vehicle GNSS knotmeter receiving satellite signal field stimulation device sends, and is calculated the movement velocity of simulation therein by least square method according to the Doppler shift of simulation satellite signal.
9. the simulation of motor vehicle GNSS knotmeter according to claim 8 is tested the speed detection system, it is characterized in that: the described analog rate v produced according to GNSS signal simulator 0with the average speed value v that the tested high precision motor vehicle GNSS knotmeter calculated records, calculating obtains range rate error Δ v and velocity survey repeatability σ is achieved in that
Adopt formulae discovery range rate error Δ v below:
Δ v = v - v 0 v 0 × 100 % ;
According to detection demand, carry out the test of multiple signal analog detection continuously, the average speed value at every turn obtained is v j, adopt the velocity survey repeatability σ of formulae discovery tested high precision motor vehicle GNSS knotmeter below:
σ = 1 n - 1 Σ j = 1 n ( v j - v ) 2
In formula, n is pendulous frequency.
CN201510373684.4A 2015-06-30 2015-06-30 Simulation speed measurement detection system and method of motor vehicle GNSS speedometer Pending CN105005067A (en)

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