CN111787560A - Method and system for testing influence of simulated target motion state on wireless communication - Google Patents
Method and system for testing influence of simulated target motion state on wireless communication Download PDFInfo
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- CN111787560A CN111787560A CN202010543527.4A CN202010543527A CN111787560A CN 111787560 A CN111787560 A CN 111787560A CN 202010543527 A CN202010543527 A CN 202010543527A CN 111787560 A CN111787560 A CN 111787560A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/06—Testing, supervising or monitoring using simulated traffic
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/391—Modelling the propagation channel
- H04B17/3912—Simulation models, e.g. distribution of spectral power density or received signal strength indicator [RSSI] for a given geographic region
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
- H04L43/0823—Errors, e.g. transmission errors
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/50—Testing arrangements
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Abstract
The invention belongs to the technical field of wireless communication, and discloses a test method and a test system for simulating the influence of a target motion state on wireless communication, wherein the test method comprises the following steps: converting the relative speed of the transmitter and the receiver into a frequency offset of the wireless communication signal; converting relative acceleration of the transmitter and the receiver into a frequency change rate of the wireless communication signal; adjusting the frequency of a transmitter clock signal according to the frequency offset and the frequency change rate, and transmitting a wireless communication signal through a transmitter; receiving the wireless communication signal through a receiver, and analyzing the error rate of the received wireless communication signal; the test system comprises a transmitter, a receiver, a first direct current stabilized power supply, a second direct current stabilized power supply and a signal source with a frequency modulation function. The testing method and the testing system can fully simulate the relative speed and the relative acceleration indexes of the transmitter and the receiver, completely simulate the actual application scene, reduce the testing cost and improve the testing efficiency.
Description
Technical Field
The invention belongs to the technical field of wireless communication, and relates to a method and a system for testing the influence of a simulated target motion state on wireless communication.
Background
With the development of wireless communication technology, the application of wireless communication between high-speed motion platforms is more and more extensive, and a high-speed motion carrier has the characteristics of high speed and high acceleration; the relative speed and acceleration have great influence on the acquisition and tracking of wireless communication; however, the characteristic indexes of speed and acceleration are only reflected in practical application of products, which brings great risk to the application of a wireless communication system on a high-speed motion platform, so how to physically test the influence of speed and acceleration on communication under laboratory conditions becomes a problem to be solved urgently.
At present, the influence of speed and acceleration on wireless communication is mostly theoretically verified through simulation, however, the method cannot verify whether the actual product has risk in the actual application; in order to test the influence of the speed and the acceleration of an actual product on communication in an actual application scene, a real object mounting flight test (namely mounting communication equipment on an aircraft) is often adopted for verification, so that the test cost is high; secondly, if the movement speed of the high-speed movement platform is higher than the maximum speed of the test aircraft, the influence of the high-speed movement platform on the speed and the acceleration cannot be fully verified by using a verification method of the hang-off test, and the actual application scene cannot be completely simulated.
Disclosure of Invention
The invention aims to overcome the defects that the test cost for the influence of the speed and the acceleration on the wireless communication is high and the influence of the speed and the acceleration cannot be fully verified in the prior art, and provides a test method and a test system for simulating the influence of a target motion state on the wireless communication.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
in one aspect of the invention, a method for testing the influence of a simulated target motion state on wireless communication comprises the following steps:
s1: converting the relative speed of the transmitter and the receiver into a frequency offset of the wireless communication signal;
s2: converting relative acceleration of the transmitter and the receiver into a frequency change rate of the wireless communication signal;
s3: adjusting the frequency of a transmitter clock signal according to the frequency offset and the frequency change rate, and transmitting a wireless communication signal through a transmitter;
s4: the wireless communication signal is received by the receiver, and the error rate of the received wireless communication signal is analyzed.
The test method of the invention is further improved in that:
the specific method of S1 is as follows:
the relative speed of the transmitter and receiver is converted into the frequency offset of the wireless communication signal by equation (1):
where fd denotes a frequency offset of a radio communication signal, v denotes a relative speed between a transmitter and a receiver, and c is 3 × 108m/s, fc denotes the carrier frequency of the wireless transmission.
The specific method of S2 is as follows:
the relative acceleration of the transmitter and the receiver is taken as the frequency change rate of the wireless communication signal by the following formula (2):
wherein, FMRateIndicating the frequency change rate of the wireless communication signal, a indicating the relative acceleration of the transmitter and the receiver, v1 indicating the initial relative velocity of the transmitter and the receiver, v2 indicating the maximum relative velocity of the transmitter and the receiver, and fd indicating the frequency offset of the wireless communication signal.
The S3 further includes:
the power of the wireless communication signal is adjusted to within sensitivity conditions of the receiver.
On the other hand, the invention relates to a test system for simulating the influence of the motion state of a target on wireless communication, which comprises a transmitter, a receiver, a first direct-current stabilized power supply, a second direct-current stabilized power supply and a signal source with a frequency modulation function; the signal source is sequentially connected with a transmitter and a receiver, the first direct current stabilized voltage supply is connected with the transmitter, and the second direct current stabilized voltage supply is connected with the receiver; wherein:
the signal source is used for generating a clock signal with preset frequency parameters and sending the clock signal to the transmitter; the preset frequency parameters comprise the frequency of a transmitter clock signal, frequency offset and frequency change rate, wherein the frequency offset is obtained according to the relative speed of a transmitter and a receiver, and the frequency change rate is obtained according to the relative acceleration of the transmitter and the receiver;
the transmitter is used for receiving a clock signal sent by the signal source and sending a wireless communication signal according to the clock signal;
the receiver is used for receiving the wireless communication signals transmitted by the transmitter.
The test system of the invention is further improved in that:
the system also comprises an attenuator, wherein the transmitter and the receiver are connected through the attenuator, and the attenuator is used for adjusting the power of the wireless communication signal transmitted by the transmitter to be within the sensitivity condition of the receiver.
The transmitter and receiver are connected by a radio frequency line.
Compared with the prior art, the invention has the following beneficial effects:
the testing method of the invention converts the relative speed of the transmitter and the receiver into the frequency offset of the wireless communication signal, converts the relative acceleration of the transmitter and the receiver into the frequency change rate of the wireless communication signal, the relative velocity of the transmitter and the receiver is characterized by the frequency offset, the relative acceleration of the transmitter and the receiver is characterized by the frequency change rate, furthermore, the influence of the motion state on the wireless communication can be tested only by adjusting the frequency of the clock signal of the transmitter without providing speed and acceleration indexes for the transmitter and the receiver, thereby greatly simplifying the test difficulty, and further, the test cost is reduced, the test efficiency is improved, the condition limit of speed and acceleration is avoided, and the scene of practical application can be completely simulated.
Further, a specific way of converting the relative velocity and the relative acceleration to the frequency offset and the frequency change rate is given.
Furthermore, the power of the wireless communication signal is adjusted to be within the sensitivity condition of the receiver, so that the stable operation of the receiver is ensured, and the damage caused by the overlarge power of the received wireless communication signal is prevented.
The testing system of the invention provides a clock signal for the transmitter by replacing the on-board crystal oscillator of the transmitter with the signal source with the frequency modulation function, so that the transmitter can work under the preset frequency parameters, the preset frequency parameters include the frequency of the transmitter clock signal, the frequency offset and the frequency change rate, and the frequency offset is obtained from the relative velocities of the transmitter and the receiver, the rate of change of frequency is obtained from the relative accelerations of the transmitter and the receiver, thus, the relative speed and relative acceleration between the transmitter and the receiver can be simulated by the clock signal with preset frequency parameters, and then, the receiver receives the wireless communication signal and analyzes the error rate condition to realize the test of the influence of the target motion state on the wireless communication, the whole test system is simple and easy to realize, no additional power device is needed, and the cost of the whole system is greatly reduced.
Furthermore, the system also comprises an attenuator, wherein the transmitter is connected with the receiver through the attenuator, and the attenuator is used for adjusting the power of the wireless communication signal sent by the transmitter to be within the sensitivity condition of the receiver, so that the stable operation of the receiver is ensured, and the damage caused by the overlarge power of the received wireless communication signal is prevented.
Drawings
FIG. 1 is a block diagram of a test system according to an embodiment of the present invention;
FIG. 2 is a block diagram of a test flow according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention is described in further detail below with reference to the accompanying drawings:
the speed and acceleration of a high-speed moving platform affect wireless communication mainly in that the speed of the high-speed moving platform causes the relative frequency offset between a transmitter and a receiver to increase, and the acceleration causes the frequency offset of two communication platforms to change continuously. Based on the principle, the speed and acceleration characteristics of the high-speed platform can be converted into indexes of frequency offset and frequency change rate in wireless communication, and then the speed and acceleration indexes of the high-speed moving platform can be mapped by adjusting the frequency offset and the frequency change rate of the wireless communication equipment.
Based on the above analysis, the invention discloses a test method for simulating the influence of the motion state of a target on wireless communication, which can fully simulate the speed and acceleration indexes of wireless communication equipment, reduce the test cost and improve the test efficiency, and comprises the following steps:
s1: the relative speed of the transmitter and receiver is converted into a frequency offset of the wireless communication signal.
Specifically, the relative speed of the transmitter and the receiver is converted into the frequency offset of the wireless communication signal by equation (1):
where fd denotes a frequency offset of a radio communication signal, v denotes a relative speed between a transmitter and a receiver, and c is 3 × 108m/s, fc denotes the carrier frequency of the wireless transmission.
S2: the relative acceleration of the transmitter and receiver is converted to a rate of change of frequency of the wireless communication signal.
Specifically, the relative acceleration of the transmitter and the receiver is converted into the frequency change rate of the wireless communication signal by equation (2):
wherein, FMRateIndicating the frequency change rate of the wireless communication signal, a indicating the relative acceleration of the transmitter and the receiver, v1 indicating the initial relative velocity of the transmitter and the receiver, v2 indicating the maximum relative velocity of the transmitter and the receiver, and fd indicating the frequency offset of the wireless communication signal.
S3: and adjusting the frequency of a transmitter clock signal according to the frequency offset and the frequency change rate, and transmitting a wireless communication signal through a transmitter. Preferably, the method further comprises the step of adjusting the power of the wireless communication signal to be within the sensitivity condition of the receiver, so as to ensure the stable operation of the receiver and prevent the damage caused by the excessive power of the received wireless communication signal.
S4: and receiving the wireless communication signals through the receiver, analyzing the error rate of the received wireless communication signals, and if the error rate can still meet the index requirement, indicating that the transmitter and the receiver can meet the requirements of the relative speed and the relative acceleration.
The invention also discloses a system for testing the influence of the simulated target motion state on wireless communication, which comprises a transmitter, a receiver, a first direct current stabilized power supply, a second direct current stabilized power supply and a signal source with a frequency modulation function; the signal source is connected with the transmitter and the receiver in sequence, the transmitter is connected with the receiver through a radio frequency line, the first direct current stabilized voltage supply is connected with the transmitter, and the second direct current stabilized voltage supply is connected with the receiver.
The signal source is used for generating a clock signal with preset frequency parameters and sending the clock signal to the transmitter; the transmitter is used for receiving a clock signal sent by the signal source and sending a wireless communication signal according to the clock signal; the receiver is used for receiving the wireless communication signals transmitted by the transmitter.
Based on the single clock frequency of the crystal oscillator, the signal source with the frequency modulation function is adopted to replace the crystal oscillator on the board to provide the clock signal for the transmitter in the test system for simulating the influence of the target motion state on the wireless communication, so that the clock signal can meet the requirements of different frequencies.
The preset frequency parameter depends on the relative speed and relative acceleration of the transmitter and the receiver, and as mentioned in the above test method for simulating the influence of the motion state of the object on the wireless communication, the preset frequency parameter is determined by the frequency offset and the frequency change rate, and the frequency offset and the frequency change rate are obtained in the manner already described above and will not be described in detail.
Preferably, the test system for simulating the influence of the target motion state on the wireless communication further includes an attenuator, the transmitter and the receiver are connected through the attenuator, and the attenuator is used for adjusting the power of the wireless communication signal sent by the transmitter to be within the sensitivity condition of the receiver, so as to ensure the stable operation of the receiver and prevent the damage caused by the excessive power of the received wireless communication signal.
The following is a description of specific embodiments of the present invention.
When the relative speed of the transmitter and the receiver is 300m/s and the relative acceleration is 30g, the corresponding frequency deviation is 40Hz and the frequency change rate of the speed from 0 to 300m/s is 40Hz/s for a crystal oscillator of 40 MHz.
Referring to fig. 2, a test flow for simulating the influence of the target motion state on the wireless communication is firstly established according to the test system, and the parameters of the signal source are set as follows: the center frequency is 40MHz, the frequency modulation range is 40Hz, the frequency change rate is 40Hz/s, and the amplitude is 0 dBm. After the setting is finished, a signal source is opened, an output signal of the signal source is used as a driving clock signal of a transmitter, the transmitter is electrified to transmit a wireless communication signal, then an attenuator value is adjusted, the power of the wireless communication signal is under the sensitivity condition of a receiver, the receiver is electrified to receive the wireless communication signal, the receiver is electrified to test for a long time, and the error rate condition of the receiver is observed-6The index requirement of (1); by using the method for practical test, when the frequency modulation range set by the signal source is less than or equal to 40Hz and the frequency change rate is 40Hz/s, the error rate of the receiver can meet 10 of the index requirement-6(ii) a When the frequency modulation range set by the signal source is larger than 40Hz and the frequency change rate is larger than 40Hz/s, the error rate of the receiver is 3 x 10-5Does not satisfy the index 10-6The requirements of (1); therefore, the test method is the same as the simulation result, and can fully simulate the influence of the target motion state on the wireless communication.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (7)
1. A test method for simulating the influence of a target motion state on wireless communication is characterized by comprising the following steps:
s1: converting the relative speed of the transmitter and the receiver into a frequency offset of the wireless communication signal;
s2: converting relative acceleration of the transmitter and the receiver into a frequency change rate of the wireless communication signal;
s3: adjusting the frequency of a transmitter clock signal according to the frequency offset and the frequency change rate, and transmitting a wireless communication signal through a transmitter;
s4: the wireless communication signal is received by the receiver, and the error rate of the received wireless communication signal is analyzed.
2. The method for testing the influence of the motion state of the simulated target on the wireless communication according to claim 1, wherein the specific method of S1 is as follows:
the relative speed of the transmitter and receiver is converted into the frequency offset of the wireless communication signal by equation (1):
where fd denotes a frequency offset of a radio communication signal, v denotes a relative speed between a transmitter and a receiver, and c is 3 × 108m/s, fc denotes the carrier frequency of the wireless transmission.
3. The method for testing the influence of the motion state of the simulated target on the wireless communication according to claim 1, wherein the specific method of S2 is as follows:
the relative acceleration of the transmitter and the receiver is taken as the frequency change rate of the wireless communication signal by the following formula (2):
wherein, FMRateIndicating the frequency change rate of the wireless communication signal, a indicating the relative acceleration of the transmitter and the receiver, v1 indicating the initial relative velocity of the transmitter and the receiver, v2 indicating the maximum relative velocity of the transmitter and the receiver, and fd indicating the frequency offset of the wireless communication signal.
4. The method for testing influence of simulated target motion state on wireless communication according to claim 1, wherein said S3 further comprises:
the power of the wireless communication signal is adjusted to within sensitivity conditions of the receiver.
5. A test system for simulating the influence of a target motion state on wireless communication is characterized by comprising a transmitter, a receiver, a first direct-current stabilized power supply, a second direct-current stabilized power supply and a signal source with a frequency modulation function; the signal source is sequentially connected with a transmitter and a receiver, the first direct current stabilized voltage supply is connected with the transmitter, and the second direct current stabilized voltage supply is connected with the receiver; wherein:
the signal source is used for generating a clock signal with preset frequency parameters and sending the clock signal to the transmitter; the preset frequency parameters comprise the frequency of a transmitter clock signal, frequency offset and frequency change rate, wherein the frequency offset is obtained according to the relative speed of a transmitter and a receiver, and the frequency change rate is obtained according to the relative acceleration of the transmitter and the receiver;
the transmitter is used for receiving a clock signal sent by the signal source and sending a wireless communication signal according to the clock signal;
the receiver is used for receiving the wireless communication signals transmitted by the transmitter.
6. The system for testing the influence of the moving state of the object on the wireless communication according to claim 5, further comprising an attenuator, wherein the transmitter and the receiver are connected through the attenuator, and the attenuator is used for adjusting the power of the wireless communication signal transmitted by the transmitter to be within the sensitivity condition of the receiver.
7. The system for testing the impact of the simulated object motion state on wireless communication of claim 5, wherein the transmitter and receiver are connected by a radio frequency line.
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