CN104635246A - System and method for detecting dynamic range of satellite navigation signal - Google Patents
System and method for detecting dynamic range of satellite navigation signal Download PDFInfo
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- CN104635246A CN104635246A CN201510089918.2A CN201510089918A CN104635246A CN 104635246 A CN104635246 A CN 104635246A CN 201510089918 A CN201510089918 A CN 201510089918A CN 104635246 A CN104635246 A CN 104635246A
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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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Abstract
The invention provides a system for detecting dynamic range of a satellite navigation signal. The system comprises a satellite navigation signal simulator, a frequency meter, a frequency automatic collecting device and a dynamic range analysis and calculating module. The system for detecting the dynamic range of the satellite navigation signal is utilized. The invention also provides a method for detecting the dynamic range of the satellite navigation signal; on the basis of satellite navigation signal simulator working principle and Doppler effect, a radio frequency signal received by a receiver under different dynamic environments can be simulated in real time, the method for detecting the dynamic range of the satellite navigation signal is analyzed at the aspects, such as speed, acceleration and jerk, a dynamic range detecting platform is built, a specific testing scheme is formed, and the experiment is conducted to verify the correctness, practicality and effectiveness of the testing method. The testing method has the advantages that the simplicity, convenience and reliability are realized, and the dynamic range of the satellite navigation signal can be correctly detected in the simulating environment.
Description
Technical field
The present invention relates to technical field of satellite navigation, particularly relate to a kind of dynamic range detection system and detection method of satellite navigation signals.
Background technology
Along with the construction of Beidou satellite navigation system, this emerging technology of satellite navigation is more and more subject to the favor of all trades and professions, and satellite navigation receiver is also applied widely.Be mainly used in navigation due to satellite navigation receiver and aviation is tested the speed, surveyed and drawn the fields such as high-acruracy survey, it exports the accuracy of measurement data, reliability is most important.Satellite navigation simulator provides signal for the high-acruracy survey of the equipment such as satellite navigation receiver, according to concrete test request, generate and run multiple different simulated scenario, test and validation is carried out to satellite navigation receiver, therefore, the radiofrequency signal performance of satellite navigation signal simulator modulating output directly affects the test result of satellite navigation receiver.For ensureing growing satellite navigation receiver testing requirement and the needs of correct reliable assessment, Criterion, perfect satellite navigation signal simulator key index Measurement and calibration method are of crucial importance.
Carrying out in test job to satellite navigation signal simulator, paper examines be the performance index of its radiofrequency signal.Radiofrequency signal performance index mainly comprise signal power control, dynamic range, pseudorange error control, signal spectrum purity, internal timebase frequency accuracy and degree of stability etc., and wherein dynamic range is the important technology index affecting satellite navigation signal simulator dynamic perfromance.Satellite navigation signal simulator dynamic range performance directly determines the test result of the dynamic perfromances such as receiver (especially high dynamic receiver) dynamic locating accuracy.Owing to there is the dynamic perfromance of relative motion and real satellite navigation neceiver between satellite and the earth, the Doppler become when the radiofrequency signal that receiver receives exists, this radiofrequency signal requiring satellite navigation signal simulator to simulate meets index request respectively on speed, acceleration, acceleration.But, because China's satellite navigation signal simulator technology is started late, add foreign technology and block, the research of satellite navigation signal simulator dynamic range context of detection is less, though existing technique study is analyzed theoretically, lack the detection scheme of practical.
Summary of the invention
For solving prior art Problems existing, the invention provides a kind of dynamic range detection system of satellite navigation signals, comprising
Satellite navigation signal simulator, for generating satellite navigation signals;
Frequency meter, for measuring the frequency values of described satellite navigation signals;
Frequency automatic acquisition device, for automatically gathering as computer version by described frequency values; And
Range Analysis computing module, for calculating dynamic range index according to the described computer version gathered.
Optionally, the dynamic range detection system of described satellite navigation signals also comprises navigation signal control module, for controlling described satellite navigation signal simulator with free configuration detection scene, described Range Analysis computing module calculates corresponding dynamic range index in conjunction with described detection scene.
Optionally, described detection scene comprises velocity measuring scene, acceleration detection scene and acceleration and detects scene, and corresponding described dynamic range index comprises speed, acceleration, acceleration index.
Optionally, described satellite navigation signals is the radiofrequency signal that satellite navigation receiver can receive.
Optionally, the Doppler shift according to described computer version calculates dynamic range index.
Optionally, the dynamic range detection system of described satellite navigation signals also comprises amplifier, for amplifying described satellite navigation signals.
The present invention also provides a kind of dynamic range detection method of satellite navigation signals, comprises
Satellite navigation signal simulator generates satellite navigation signals;
The frequency values of described satellite navigation signals measured by frequency meter;
Described frequency values gathers as computer version by frequency automatic acquisition device in real time automatically; And
Range Analysis computing module calculates dynamic range index according to the described computer version gathered.
Optionally, before described satellite navigation signal simulator generates satellite navigation signals, first realize start preheating.
Optionally, navigation signal control module controls described satellite navigation signal simulator with configuration detection scene, and described satellite navigation signal simulator runs this detection scene, generates satellite navigation signals.
Optionally, described detection scene is velocity measuring scene, arranging the motion model of satellite navigation receiver under this detection scene is: after static with described satellite navigation signal simulator speed index range higher limit for velocity amplitude, along satellite radial direction uniform motion.
Optionally, described Range Analysis computing module, based on Doppler shift principle, utilizes formula
computing velocity dynamic range; Wherein, v is speed, and fd is Doppler shift, and c is the light velocity, fs be described satellite navigation receiver static time the radio frequency signal frequency value that receives.
Optionally, described detection scene is acceleration detection scene, arranging the motion model of satellite navigation receiver under this detection scene is: after static with described satellite navigation signal simulator acceleration indication range higher limit for accekeration, along the uniformly accelerated motion of satellite radial direction, final speed is described satellite navigation signal simulator speed index range higher limit.
Optionally, described Range Analysis computing module, based on Doppler shift principle, utilizes formula
calculate acceleration dynamic range; Wherein, a is acceleration, and fd is Doppler shift, and c is the light velocity, Δ T be frequency from least significant end to most significant end elapsed time, fs be described satellite navigation receiver static time the radio frequency signal frequency value that receives.
Optionally, described detection scene is that acceleration detects scene, arranging the motion model of satellite navigation receiver under this detection scene is: after static with described satellite navigation signal simulator acceleration indication range higher limit for acceleration value, along satellite radial direction as acceleration be zero evenly add accelerated motion, final speed is described satellite navigation signal simulator speed index range higher limit.
Optionally, described Range Analysis computing module, based on Doppler shift principle, utilizes formula
calculate acceleration dynamic range; Wherein, J is acceleration, and fd is Doppler shift, and c is the light velocity, Δ T be frequency from least significant end to most significant end elapsed time, fs be described satellite navigation receiver static time the radio frequency signal frequency value that receives.
Optionally, the method configuring described detection scene comprises
Close atmosphere delay;
Select global position system, and satellite-signal frequency is set;
Satellite navigation signal simulator selects single visible satellite scene, edits this satellite orbit parameter and makes it be on geostationary orbit, and arranges satellite and earth center line is B in the longitude of spherical intersection;
Close described visible satellite spreading code and navigation data, make it send single-carrier modulated signal;
Arranging described visible satellite signal power is maximal value;
Arranging satellite navigation receiver initial position longitude is B, and latitude value is 0, and height value is greater than 0, and the vector of unit length of direction of motion is (cosB, sinB, 0).
Optionally, described satellite navigation signal simulator supports BDS system, selects the visible satellite selected during single visible satellite scene in five geostationary orbit satellites.
The dynamic range detection system of satellite navigation signals of the present invention is based on satellite navigation signal simulator principle of work and Doppler effect, the radiofrequency signal that under real time modelling Different Dynamic environment, receiver receives, satellite navigation signal simulator dynamic range method of testing is analyzed from aspects such as speed, acceleration, accelerations, and build dynamic range test platform, form concrete testing scheme, carry out the correctness of experimental verification method of testing, practicality and validity.This method of testing is reliably easy, accurately can detect the dynamic range of satellite navigation signal simulator in simulated environment.
Accompanying drawing explanation
The structural representation of the dynamic range detection system that Fig. 1 is satellite navigation signals described in one embodiment of the invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail, makes advantages and features of the invention clearer.It should be noted that, accompanying drawing all adopts the form that simplifies very much and all uses non-ratio accurately, only in order to object that is convenient, the aid illustration embodiment of the present invention lucidly.
As shown in Figure 1, the dynamic range detection system of satellite navigation signals of the present invention comprises:
Satellite navigation signal simulator, for generating satellite navigation signals;
Frequency meter, for measuring the frequency values of described satellite navigation signals;
Frequency automatic acquisition device, for automatically gathering as computer version by described frequency values; And
Range Analysis computing module, for calculating dynamic range index according to the described computer version gathered.
Concrete, satellite navigation signals is the radiofrequency signal that satellite navigation receiver can receive; The frequency information of computer version display is Doppler shift, and Range Analysis computing module calculates dynamic range index according to described Doppler shift.In the present embodiment, the dynamic range detection system of satellite navigation signals also comprises navigation signal control module, be connected to satellite navigation signal simulator, for controlling described satellite navigation signal simulator with free configuration detection scene, described Range Analysis computing module calculates corresponding dynamic range index in conjunction with described detection scene.Concrete, detect scene and can comprise velocity measuring scene, acceleration detection scene and acceleration detection scene, corresponding described dynamic range index comprises speed, acceleration, acceleration index, but the present invention is not restricted this.
The dynamic range detection system of satellite navigation signals also comprises amplifier, such as, be low noise amplifier, be connected between satellite navigation signal simulator and frequency meter.If desired test the less signal of intensity, then need amplifier to be amplified by satellite navigation signals, receive for frequency meter.
The present invention also provides a kind of dynamic range detection method of satellite navigation signals, mainly comprises the following steps:
Satellite navigation signal simulator generates satellite navigation signals;
The frequency values of described satellite navigation signals measured by frequency meter;
Described frequency values gathers as computer version by frequency automatic acquisition device in real time automatically; And
Range Analysis computing module calculates dynamic range index according to the described computer version gathered.
This method is described in further detail below with a specific embodiment.
The first step, opens satellite navigation signal simulator, and more than preheating 30min.
Second step, calls velocity range test scene, and this scene possesses following features:
Close atmosphere delay;
Select BDS system, and satellite-signal frequency B1 is set;
Simulator simulating scenes selects single geostationary orbit satellite, edits this satellite orbit parameter and makes it be on geostationary orbit, and arrange the longitude B=0 ° of substar;
Close visible satellite spreading code and navigation data, make it send single-carrier modulated signal;
Arranging visible satellite signal power is maximal value;
Arranging receiver initial position longitude is B, and latitude value is 0, and height value is 6378.140 kilometers, and the vector of unit length of direction of motion is (cosB, sinB, 0);
Receiver motion model is set: after receiver static 10s, 10s under ECEF coordinate system with the higher limit of simulator velocity range index, the uniform motion of 1min is done in such as speed (Vx, Vy, Vz)=(100000m/s, 0,0);
3rd step, run this scene and start emulation, the frequency values that frequency automatic acquisition device Real-time Collection frequency meter exports, Range Analysis computing module is based on Doppler shift principle, utilize formula 1) computing velocity value v, (-v ~+v) is as speed dynamic range:
In formula, v is speed, and fd is Doppler shift, and c is the light velocity, fs be receiver static time the radio frequency signal frequency value that receives.
4th step, stop emulation, call acceleration range test scene, this scene possesses following features:
Close atmosphere delay;
Select BDS system, and satellite-signal frequency B1 is set;
Simulator simulating scenes selects single geostationary orbit satellite, edits this satellite orbit parameter and makes it be on geostationary orbit, and arrange the longitude B=0 ° of substar;
Close visible satellite spreading code and navigation data, make it send single-carrier modulated signal;
Arranging visible satellite signal power is maximal value;
Arranging receiver initial position longitude is B, and latitude value is 0, and height value is 6378.140 kilometers, and the vector of unit length of direction of motion is (cosB, sinB, 0);
Receiver motion model is set: after receiver static 10s, 10s under ECEF coordinate system with initial velocity (Vx, Vy, Vz)=(0,0,0), acceleration is (ax, ay, az)=(5000m/s
2, 0,0) and do the uniformly accelerated motion of 20s;
5th step, run this scene and start emulation, the frequency values that frequency automatic acquisition device Real-time Collection frequency meter exports, Range Analysis computing module is based on Doppler shift principle, utilize formula 2) calculate accekeration a, (-a ~+a) is as acceleration dynamic range:
In formula, a is acceleration, and fd is Doppler shift, and c is the light velocity, Δ T be frequency from least significant end to most significant end elapsed time, fs be receiver static time the radio frequency signal frequency value that receives.
6th step, stop emulation, call acceleration range test scene, this scene possesses following features:
Close atmosphere delay;
Select BDS system, and satellite-signal frequency B1 is set;
Simulator simulating scenes selects single geostationary orbit satellite, edits this satellite orbit parameter and makes it be on geostationary orbit, and arrange the longitude B=0 ° of substar;
Close visible satellite spreading code and navigation data, make it send single-carrier modulated signal;
Arranging visible satellite signal power is maximal value;
Arranging receiver initial position longitude is B, and latitude value is 0, and height value is 6378.140 kilometers, and the vector of unit length of direction of motion is (cosB, sinB, 0);
Receiver motion model is set: after receiver static 10s, 10s under ECEF coordinate system with initial velocity (Vx, Vy, Vz)=(0,0,0), acceleration is (ax, ay, az)=(0,0,0), acceleration is (Jx, Jy, Jz)=(10000m/s
3, 0,0) do the even of 20s and add accelerated motion;
7th step, run this scene and start emulation, the frequency values that frequency automatic acquisition device Real-time Collection frequency meter exports, Range Analysis computing module is based on Doppler shift principle, utilize formula 3) calculate acceleration value J, (-J ~+J) is as acceleration dynamic range:
In formula, J is acceleration, and fd is Doppler shift, and c is the light velocity, Δ T be frequency from least significant end to most significant end elapsed time, fs be receiver static time the radio frequency signal frequency value that receives.
The present invention is based on satellite navigation signal simulator principle of work and Doppler effect, the radiofrequency signal that under real time modelling Different Dynamic environment, receiver receives, satellite navigation signal simulator dynamic range method of testing is analyzed from aspects such as speed, acceleration, accelerations, and build dynamic range test platform, form concrete testing scheme, carry out the correctness of experimental verification method of testing, practicality and validity.This method of testing is reliably easy, accurately can detect the dynamic range of satellite navigation signal simulator in simulated environment.
Obviously, those skilled in the art can carry out various change and modification to invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (17)
1. a dynamic range detection system for satellite navigation signals, is characterized in that, comprise
Satellite navigation signal simulator, for generating satellite navigation signals;
Frequency meter, for measuring the frequency values of described satellite navigation signals;
Frequency automatic acquisition device, for automatically gathering as computer version by described frequency values; And
Range Analysis computing module, for calculating dynamic range index according to the described computer version gathered.
2. the dynamic range detection system of satellite navigation signals as claimed in claim 1, it is characterized in that, also comprise navigation signal control module, for controlling described satellite navigation signal simulator with free configuration detection scene, described Range Analysis computing module calculates corresponding dynamic range index in conjunction with described detection scene.
3. the dynamic range detection system of satellite navigation signals as claimed in claim 2, it is characterized in that, described detection scene comprises velocity measuring scene, acceleration detection scene and acceleration and detects scene, and corresponding described dynamic range index comprises speed, acceleration, acceleration index.
4. the dynamic range detection system of satellite navigation signals as claimed in claim 1, it is characterized in that, described satellite navigation signals is the radiofrequency signal that satellite navigation receiver can receive.
5. the dynamic range detection system of satellite navigation signals as claimed in claim 1, is characterized in that, the Doppler shift according to described computer version calculates dynamic range index.
6. the dynamic range detection system of satellite navigation signals as claimed in claim 1, is characterized in that, also comprise amplifier, for amplifying described satellite navigation signals.
7. a dynamic range detection method for satellite navigation signals, is characterized in that, comprise
Satellite navigation signal simulator generates satellite navigation signals;
The frequency values of described satellite navigation signals measured by frequency meter;
Described frequency values gathers as computer version by frequency automatic acquisition device in real time automatically; And
Range Analysis computing module calculates dynamic range index according to the described computer version gathered.
8. the dynamic range detection method of satellite navigation signals as claimed in claim 7, is characterized in that, before described satellite navigation signal simulator generates satellite navigation signals, first realizes start preheating.
9. the dynamic range detection method of satellite navigation signals as claimed in claim 7, it is characterized in that, navigation signal control module controls described satellite navigation signal simulator with configuration detection scene, and described satellite navigation signal simulator runs this detection scene, generates satellite navigation signals.
10. the dynamic range detection method of satellite navigation signals as claimed in claim 9, it is characterized in that, described detection scene is velocity measuring scene, arranging the motion model of satellite navigation receiver under this detection scene is: after static with described satellite navigation signal simulator speed index range higher limit for velocity amplitude, along satellite radial direction uniform motion.
The dynamic range detection system of 11. satellite navigation signals as claimed in claim 10, it is characterized in that, described Range Analysis computing module, based on Doppler shift principle, utilizes formula
computing velocity dynamic range; Wherein, v is speed, and fd is Doppler shift, and c is the light velocity, fs be described satellite navigation receiver static time the radio frequency signal frequency value that receives.
The dynamic range detection method of 12. satellite navigation signals as claimed in claim 9, it is characterized in that, described detection scene is acceleration detection scene, arranging the motion model of satellite navigation receiver under this detection scene is: after static with described satellite navigation signal simulator acceleration indication range higher limit for accekeration, along the uniformly accelerated motion of satellite radial direction, final speed is described satellite navigation signal simulator speed index range higher limit.
The dynamic range detection method of 13. satellite navigation signals as claimed in claim 12, it is characterized in that, described Range Analysis computing module, based on Doppler shift principle, utilizes formula
calculate acceleration dynamic range; Wherein, a is acceleration, and fd is Doppler shift, and c is the light velocity, Δ T be frequency from least significant end to most significant end elapsed time, fs be described satellite navigation receiver static time the radio frequency signal frequency value that receives.
The dynamic range detection method of 14. satellite navigation signals as claimed in claim 9, it is characterized in that, described detection scene is that acceleration detects scene, arranging the motion model of satellite navigation receiver under this detection scene is: after static with described satellite navigation signal simulator acceleration indication range higher limit for acceleration value, along satellite radial direction as acceleration be zero evenly add accelerated motion, final speed is described satellite navigation signal simulator speed index range higher limit.
The dynamic range detection method of 15. satellite navigation signals as claimed in claim 14, it is characterized in that, described Range Analysis computing module, based on Doppler shift principle, utilizes formula
calculate acceleration dynamic range; Wherein, J is acceleration, and fd is Doppler shift, and c is the light velocity, Δ T be frequency from least significant end to most significant end elapsed time, fs be described satellite navigation receiver static time the radio frequency signal frequency value that receives.
The dynamic range detection method of 16. satellite navigation signals as described in claim 9-15 any one, it is characterized in that, the method configuring described detection scene comprises
Close atmosphere delay;
Select global position system, and satellite-signal frequency is set;
Satellite navigation signal simulator selects single visible satellite scene, edits this satellite orbit parameter and makes it be on geostationary orbit, and arranges satellite and earth center line is B in the longitude of spherical intersection;
Close described visible satellite spreading code and navigation data, make it send single-carrier modulated signal;
Arranging described visible satellite signal power is maximal value;
Arranging satellite navigation receiver initial position longitude is B, and latitude value is 0, and height value is greater than 0, and the vector of unit length of direction of motion is (cosB, sinB, 0).
The dynamic range detection method of 17. satellite navigation signals as claimed in claim 16, it is characterized in that, described satellite navigation signal simulator supports BDS system, selects the visible satellite selected during single visible satellite scene in five geostationary orbit satellites.
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| CN108680934A (en) * | 2018-05-14 | 2018-10-19 | 上海市计量测试技术研究院 | The dynamic range detecting system and detection method of satellite navigation signals |
| CN110887508A (en) * | 2019-11-30 | 2020-03-17 | 航天科技控股集团股份有限公司 | Dynamic positioning function detection method for vehicle-mounted navigation product |
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Application publication date: 20150520 |