CN111935719A - Pseudo base station identification and positioning method and vehicle-mounted system - Google Patents
Pseudo base station identification and positioning method and vehicle-mounted system Download PDFInfo
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- CN111935719A CN111935719A CN202011022426.9A CN202011022426A CN111935719A CN 111935719 A CN111935719 A CN 111935719A CN 202011022426 A CN202011022426 A CN 202011022426A CN 111935719 A CN111935719 A CN 111935719A
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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
- H04B17/318—Received signal strength
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- H—ELECTRICITY
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- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
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- H—ELECTRICITY
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- H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
Abstract
The invention discloses a pseudo base station identification and positioning method and a vehicle-mounted system, which are used for acquiring first signal strength of an omnidirectional antenna for receiving radio frequency signals and second signal strength of a directional antenna for receiving the radio frequency signals, identifying whether a pseudo base station exists or not according to the first signal strength, and accurately positioning the pseudo base station according to the first signal strength and the second signal strength under the condition that the pseudo base station exists. The invention can identify the pseudo base station in a simpler mode, does not need to access and demodulate base station signals, does not cause access burden to a normal base station, can overcome the influence of obstacles in a complex urban environment and can realize accurate positioning of the pseudo base station at a higher speed.
Description
Technical Field
The invention relates to the field of communication, in particular to a pseudo base station identification and positioning method and a vehicle-mounted system.
Background
The pseudo base station is disguised as the base station of an operator, so that short messages such as fraud, advertising promotion and the like are forcibly pushed to the mobile phone of the user within the coverage area, the private information of the user can be stolen, and the normal communication safety and the social stability are seriously damaged.
The pseudo base station has some characteristics compared with the normal base station, such as different parameters like LAC and CI, and obviously higher signal power. The existing pseudo base station identification method generally identifies a terminal access base station and demodulates signals, identifies parameters such as LAC, CI and the like, or identifies the signal intensity of each base station, and finds an abnormal pseudo base station by comparing the parameters and the signal intensity with those of a normal base station. After the pseudo base station is identified, the pseudo base station is usually located to check the pseudo base station equipment or illegal operators.
For example, CN104768158A (applicant is cheng da gao bo chu information technology limited company, published as 2015, 7/8) discloses a method for identifying and locating a pseudo base station, which includes scanning all frequency bands in GSM frequency band, measuring C2L, CI, LAC, and power, comparing the measured values with stored parameters of a normal base station, determining whether the base station is a pseudo base station, continuously approaching the position of the pseudo base station according to signal power, and locating the pseudo base station when the power is larger and the distance is closer to the pseudo base station. However, this identification method requires accessing and demodulating the base station signal to obtain the relevant parameters, which is troublesome and causes a certain access burden to the normal base station. In addition, the time for approaching to the legal positioning is long, and the pseudo base station can be finally positioned only when the pseudo base station is close to the pseudo base station, so that the illegal operators are easily warned.
Another method for positioning the pseudo base station is to receive the signal of the pseudo base station by using a directional antenna and perform positioning according to the strength, time delay and azimuth angle of the signal. However, in a real urban environment where a pseudo base station exists, obstacles such as buildings often exist, and signals received by the directional antenna are affected by the obstacles, and multipath effects such as refraction and diffraction exist, so that it is difficult to actually achieve accurate positioning.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a pseudo base station identification and positioning method and a vehicle-mounted system, which can identify a pseudo base station in a simpler mode, do not need to access and demodulate base station signals, do not cause access burden on a normal base station, can overcome the influence of obstacles in a complex urban environment, and can realize accurate positioning on the pseudo base station at a higher speed.
On one hand, the invention provides a pseudo base station identification and positioning method, which comprises the following steps:
step 1, receiving a radio frequency signal through an omnidirectional antenna to obtain a first signal strength S1, and obtaining a current geographic position through a positioning module;
step 2, judging whether a pseudo base station exists according to the first signal strength S1 and the current geographic position, returning to the step 1 when the pseudo base station does not exist, recording the frequency band f of the pseudo base station when the pseudo base station exists, and executing the step 3;
step 3, scanning the directional antenna for 360 degrees to obtain the signal intensity of the radio frequency signal received at the frequency band f in each direction;
step 4, selecting the signal strength with stronger signal strength and the corresponding direction, judging whether the radio frequency signal in the direction comes from the pseudo base station, and if the radio frequency signal comes from the pseudo base station, recording the signal strength of the radio frequency signal received in the direction as a second signal strength S2;
step 5, judging whether an obstacle exists between the vehicle-mounted system and the pseudo base station or not according to the first signal strength S1 and the second signal strength S2;
step 6, if no barrier exists between the vehicle-mounted system and the pseudo base station, determining the geographic position of the pseudo base station;
and 7, if the obstacle exists between the vehicle-mounted system and the pseudo base station, the vehicle-mounted system moves a preset distance along the road in the direction of enhancing the first signal intensity S1, the steps 1-5 are repeatedly executed until the obstacle does not exist between the vehicle-mounted system and the pseudo base station, and the step 6 is executed again.
Wherein, step 2 specifically includes:
2.1, inquiring a signal intensity-geographic position mapping table to obtain the normal signal intensity of each frequency band at the current geographic position S0;
2.2, comparing the first signal strength S1 with the normal signal strength S0, and judging whether a pseudo base station exists according to the difference between the first signal strength S1 and the normal signal strength S0;
2.2.1, if the difference between the first signal strength S1 and the normal signal strength S0 is less than the first threshold T1, no pseudo base station exists, and then return to step 1;
2.2.2, if the difference between the first signal strength S1 and the normal signal strength S0 is greater than a first threshold T1, querying and updating the normal base station list;
2.2.3, if a newly installed normal base station exists in the nearby area, the pseudo base station does not exist, the step 1 is returned, otherwise, the pseudo base station exists in the nearby area, and the corresponding frequency band f is recorded.
Wherein, step 4 specifically includes:
4.1, selecting the signal intensity s1 with the strongest signal intensity and the corresponding direction a 1;
4.2, calculating the distance d1 of the pseudo base station according to the signal strength s 1;
4.3, judging whether the signal strength s1 is greater than a second threshold value T2, if the signal strength s1 is greater than the second threshold value T2, determining a geographic position m1 according to the current geographic position, the distance d1 and the direction a1 of the pseudo base station, inquiring a normal base station list, and judging whether a normal base station exists at the geographic position m 1;
4.4, if there is a normal base station, determining that the radio frequency signal in the direction a1 is from the normal base station, returning to step 4.1, selecting the signal strength S2 with the second highest signal strength and the corresponding direction a2, and so on, and repeating steps 4.1-4.4 until there is no normal base station at the geographic position M determined according to the current geographic position, the distance D of the pseudo base station, and the corresponding direction a, determining that the radio frequency signal in the direction a is from the pseudo base station, and recording the signal strength of the radio frequency signal received in the direction a as the second signal strength S2.
Wherein, step 5 specifically includes:
5.1, calculating a ratio R, R = (S1-S0)/S2 of the difference between the first signal strength S1 and the normal signal strength S0 and the second signal strength S2, and inquiring a gain ratio R0 of the omnidirectional antenna and the directional antenna;
and 5.2, comparing the ratio R with the query value R0, and if the difference between the ratio R and the query value R is smaller than a third threshold T3, determining that no obstacle exists between the vehicle-mounted system and the pseudo base station, and if the difference between the ratio R and the query value R is larger than a third threshold T3, determining that an obstacle exists between the vehicle-mounted system and the pseudo base station.
Wherein, step 6 specifically includes:
the geographical location M is determined as the geographical location of the pseudo base station.
On the other hand, the invention provides a vehicle-mounted system, which comprises an omnidirectional antenna, a directional antenna, a radio frequency receiving device, a signal strength detection module, a processor, a positioning module and a memory,
the radio frequency receiving device receives radio frequency signals from a plurality of base stations including a pseudo base station by utilizing an omnidirectional antenna and a directional antenna;
the signal strength detection module is used for respectively detecting the first signal strength of the radio-frequency signal received by the omnidirectional antenna and the second signal strength of the radio-frequency signal received by the directional antenna;
the processor is used for executing the pseudo base station identification positioning method;
the positioning module is used for positioning the vehicle-mounted system in real time.
The radio frequency receiving device does not demodulate the radio frequency signal and does not access the base station.
Wherein the memory stores a list of normal base stations present in each geographical area, a ratio of gains R0 for omni-directional to directional antennas, and a signal strength-to-geographical location mapping table.
The features and advantages of the present invention will become apparent by reference to the following drawings and detailed description of specific embodiments of the invention.
Drawings
FIG. 1 illustrates an operational scenario of the in-vehicle system of the present invention;
FIG. 2 shows a schematic diagram of the on-board system of the present invention;
fig. 3 shows a flow chart of the pseudo base station identification positioning method of the invention.
Detailed Description
In order to make the technical solution of the present invention clearer and more clear, the following detailed description is made with reference to the accompanying drawings, and it should be understood that the specific embodiments described herein are only for explaining the present invention and are not intended to limit the present invention.
The invention adopts a vehicle-mounted system to realize the pseudo base station identification and positioning method. Fig. 1 shows a working scenario of the vehicle-mounted system of the present invention in identifying and locating a pseudo base station in an urban environment. As shown in fig. 1, the in-vehicle system 100 travels along a road, and a plurality of buildings exist on both sides of the road, and a plurality of base stations including the pseudo base station 200 exist in a working scene. The in-vehicle system 100 receives signals from a plurality of base stations including the pseudo base station 200, and an obstacle exists between the in-vehicle system 100 and the pseudo base station 200, and communication cannot be performed through a "line of sight" path (as shown in fig. 1, a straight line path connecting the in-vehicle system 100 and the pseudo base station 200 is blocked by a building and indicated by a symbol "x"). The so-called "line of sight" path is where there are no obstacles between the transmitter and the receiver. However, the signal transmitted from the pseudo base station 200 may bypass the building through a diffraction path, and may be refracted or reflected by other buildings and received by the in-vehicle system 100. The plurality of base stations work on a specified frequency band, taking 4G base stations of China Unicom, China Mobile and China telecom as examples, and mainly comprise LTE frequency bands 1, 3 and 39-41. The frequency band of the pseudo base station is not fixed, but in order to be pseudo as a normal base station, the same frequency band as the normal base station is generally adopted, for example, the LTE frequency bands 1, 3, 39-41 described above.
Fig. 2 is a schematic diagram showing a specific structure of the vehicle-mounted system of the invention, which is used for implementing the pseudo base station identification and positioning method of the invention. As shown in fig. 2, the in-vehicle system 100 includes an omnidirectional antenna, a directional antenna, a radio frequency receiving device, a signal strength detection module, a processor, a positioning module, and a memory.
The radio frequency receiving apparatus receives radio frequency signals from a plurality of base stations including a pseudo base station using an omni-directional antenna and a directional antenna. It should be noted that the radio frequency receiving apparatus sequentially receives the radio frequency signals in all the frequency bands available to the base station (e.g., LTE frequency bands 1, 3, 39-41) in the listening mode, but does not need to demodulate the radio frequency signals and does not need to access the base station.
The signal strength detection module detects the signal strength of the received radio frequency signal. Specifically, the signal strength detection module may detect a first signal strength of a radio frequency signal received by the omnidirectional antenna and a second signal strength of a radio frequency signal received by the directional antenna, respectively.
The processor is used for executing the pseudo base station identification and positioning method of the invention, identifying whether a pseudo base station exists according to the first signal strength, and accurately positioning the pseudo base station according to the first signal strength and the second signal strength under the condition of judging that the pseudo base station exists. The specific contents of the processor to identify and locate the pseudo base station will be described in detail below.
The positioning module is used for positioning the vehicle-mounted system in real time. Can be realized by a GPS positioning device or a Beidou positioning device.
The memory stores configuration parameters required for implementing the pseudo base station identification positioning method of the present invention.
Specifically, the memory stores a normal base station list existing in each geographic area, and the normal base station list may be updated periodically or may be updated by querying an operator server in real time.
In addition, in the case where the omni-directional antenna and the directional antenna are constant, the gain ratio of the omni-directional antenna to the directional antenna is constant. It can be expressed as R0= G1/G2, where R0 is the gain ratio of the omni-directional antenna to the directional antenna, G1 is the gain of the omni-directional antenna, and G2 is the gain of the directional antenna. The memory may store an omni-directional to directional antenna gain ratio R0.
In addition, the vehicle-mounted system can acquire the normal signal strength of the radio frequency signal at each geographic position in advance to form a signal strength-geographic position mapping table, and the signal strength-geographic position mapping table is stored in the memory. Specifically, the vehicle-mounted system 100 runs along a road at a low speed, detects the signal strength of the radio frequency signals received at all geographic positions along the road by using the omnidirectional antenna, the radio frequency receiving device and the signal strength detection module, forms historical signal strength by measuring for multiple times, takes the average value of the historical signal strength as normal signal strength, and forms a signal strength-geographic position mapping table by corresponding the normal signal strength to the geographic positions one by one. The signal strength of the received radio frequency signal may also be detected at geographical locations spaced apart by a predetermined distance to reduce the number of measurements. In general, in the absence of a pseudo base station, the signal strength of a radio frequency signal of a normal base station received at each geographical location varies little, and thus the normal signal strength can be considered to be constant. It should be noted that the radio frequency signal referred to herein refers to a mixed radio frequency signal of all base stations on all frequency bands available to the base stations (e.g., LTE frequency bands 1, 3, 39-41) that can be received at a specific geographic location.
The pseudo base station identification positioning method of the present invention is described below. Fig. 3 shows a flow chart of a pseudo base station identification positioning method of the invention, which comprises the following steps:
step 1, receiving a radio frequency signal through an omnidirectional antenna to obtain a first signal strength S1, and obtaining a current geographic position through a positioning module. Sequentially receiving radio frequency signals on all frequency bands (such as LTE frequency bands 1, 3, 39-41) available to the base station through the omnidirectional antenna, and acquiring a first signal strength of each frequency band S1. The radio frequency signals received by the omni-directional antenna include a mixture of radio frequency signals of all surrounding base stations, including a possible pseudo base station. The vehicle-mounted system can run at a low speed, measure the first signal strength and the current geographic position of the radio frequency signals received at all geographic positions along the way in real time, and also measure the first signal strength and the current geographic position at intervals of a preset distance.
And 2, judging whether a pseudo base station exists according to the first signal strength S1 and the current geographic position, returning to the step 1 when the pseudo base station does not exist, recording the frequency band f of the pseudo base station when the pseudo base station exists, and executing the step 3. The method specifically comprises the following steps:
2.1, inquiring the signal strength-geographic position mapping table to obtain the normal signal strength of each frequency band at the current geographic position S0.
2.2, comparing the first signal strength S1 with the normal signal strength S0, and judging whether a pseudo base station exists according to the difference between the first signal strength S1 and the normal signal strength S0.
2.2.1, if the difference between the first signal strength S1 and the normal signal strength S0 is less than the first threshold T1, there is no pseudo base station and the procedure returns to step 1.
2.2.2, if the difference between the first signal strength S1 and the normal signal strength S0 is greater than a first threshold T1, the normal base station list is queried and updated.
2.2.3, if a newly installed normal base station exists in the nearby area, the pseudo base station does not exist, the step 1 is returned, otherwise, the pseudo base station exists in the nearby area, and the corresponding frequency band f is recorded. The frequency band f is a frequency band of the pseudo base station, and a difference between the first signal strength S1 and the normal signal strength S0 is greater than a first threshold value. Generally, the power of the pseudo base station is much higher than that of the normal base station, so when the pseudo base station exists in the nearby area, the first signal strength S1 is significantly larger than the normal signal strength S0, and to avoid the false determination, the first threshold T1 may be set to a larger value.
And step 3, scanning the directional antenna for 360 degrees to obtain the signal strength of the radio frequency signal received at the frequency band f in each direction. Since a directional antenna can only receive radio frequency signals in a particular direction, radio frequency signals from that direction are considered to be emitted only by a single base station, and not a mixture of radio frequency signals from all surrounding base stations.
And 4, selecting the signal strength with stronger signal strength and the corresponding direction, judging whether the radio frequency signal in the direction is from the pseudo base station, and if the radio frequency signal in the direction is from the pseudo base station, recording the signal strength of the radio frequency signal received in the direction as a second signal strength S2. The method specifically comprises the following steps:
4.1, selecting the signal intensity s1 with the strongest signal intensity and the corresponding direction a1,
4.2, calculating the distance d1 of the pseudo base station according to the signal strength s 1. Since the signal strength is inversely proportional to the signal transmission distance, the signal transmission distance can be calculated according to the signal strength, and therefore, the distance d1 of the pseudo base station can be calculated according to the signal strength s 1.
4.3, judging whether the signal strength s1 is greater than a second threshold value T2, if the signal strength s1 is greater than the second threshold value T2, determining a geographic position m1 according to the current geographic position, the distance d1 and the direction a1 of the pseudo base station, inquiring a normal base station list, and judging whether a normal base station exists at the geographic position m 1.
4.4, if there is a normal base station, determining that the radio frequency signal in the direction a1 is from the normal base station, returning to step 4.1, selecting the signal strength S2 with the second highest signal strength and the corresponding direction a2, and so on, and repeating steps 4.1-4.4 until there is no normal base station at the geographic position M determined according to the current geographic position, the distance D of the pseudo base station, and the corresponding direction a, determining that the radio frequency signal in the direction a is from the pseudo base station, and recording the signal strength of the radio frequency signal received in the direction a as the second signal strength S2.
It should be noted that the geographic location M determined here is used for determining the direction of the radio frequency signal from the pseudo base station, and the geographic location M is not necessarily the true geographic location of the pseudo base station due to the diffraction, refraction or reflection influence of surrounding buildings.
If it is determined in step 4.3 that the signal strength sn is less than the second threshold T2 but the geographical location M where no normal base station exists is still not obtained, it is considered that the directional antenna cannot receive the radio frequency signal from the pseudo base station due to the existence of the obstacle between the in-vehicle system and the pseudo base station, and the second signal strength S2 cannot be successfully determined. At this time, step 4.5 is executed, the vehicle-mounted system moves a predetermined distance along the road in the direction of enhancing the first signal strength S1, and the steps 1-4 are repeatedly executed until no normal base station exists at the geographic position M, and the signal strength of the radio frequency signal received in the direction a is recorded as a second signal strength S2. Since it is not necessary to determine whether there is a fake base station again, in step 2, it is only necessary to query the signal strength-geographical location mapping table, obtain the normal signal strength S0 of each frequency band at the current geographical location, and calculate the difference between the first signal strength S1 and the normal signal strength S0 for use in the subsequent steps. In fact, if the first threshold T1 is properly selected, then the situation that the signal strength sn is less than the second threshold T2 but the geographical location M where no normal base station exists is not obtained does not occur, the second signal strength S2 can be successfully determined without performing step 4.5, and the step of determining whether the signal strength sn is greater than the second threshold T2 in step 4.3 can be omitted.
And 5, judging whether an obstacle exists between the vehicle-mounted system and the pseudo base station according to the first signal strength S1 and the second signal strength S2.
5.1, calculating the ratio R, R = (S1-S0)/S2 of the difference between the first signal strength S1 and the normal signal strength S0 and the second signal strength S2, and inquiring the gain ratio R0 of the omnidirectional antenna and the directional antenna.
And 5.2, comparing the ratio R with the query value R0, and if the difference between the ratio R and the query value R0 is smaller than a third threshold value T3, determining that no obstacle exists between the vehicle-mounted system and the pseudo base station. If the difference between the two is greater than a third threshold value T3, then an obstacle is considered to exist between the vehicle-mounted system and the pseudo base station.
When an obstacle exists between the receiver and the transmitter, the directional antenna may not receive the radio frequency signal, or may receive the radio frequency signal bypassing the obstacle through the diffraction path, and the omnidirectional antenna may receive the radio frequency signal transmitted through multiple paths such as the diffraction path, the reflection path, the refraction path, and the like, so that the omnidirectional antenna has a smaller gain drop compared to the directional antenna. That is, the ratio of the omni-directional antenna reception signal strength to the directional antenna reception signal strength increases when an obstacle is present between the receiver and the transmitter, as compared to when no obstacle is present between the receiver and the transmitter. Based on this principle, when the difference between the ratio R and the query value R0 is greater than the third threshold T3, it is considered that an obstacle exists between the in-vehicle system and the pseudo base station. When the ratio R and the query value R0 are close, it is considered that no obstacle exists between the in-vehicle system and the pseudo base station.
And 6, if no obstacle exists between the vehicle-mounted system and the pseudo base station, determining the geographic position of the pseudo base station. Specifically, when no obstacle exists between the vehicle-mounted system and the pseudo base station, the vehicle-mounted system and the pseudo base station can communicate through a 'sight line' path, so that the geographic position M determined according to the current geographic position, the distance D of the pseudo base station and the corresponding direction a is the geographic position of the pseudo base station, and therefore the geographic position M is determined as the geographic position of the pseudo base station.
And 7, if an obstacle exists between the vehicle-mounted system and the pseudo base station, the vehicle-mounted system moves a preset distance along the road in the direction of enhancing the first signal strength S1, the steps 1-5 are repeatedly executed until the obstacle does not exist between the vehicle-mounted system and the pseudo base station, namely the difference between the ratio R and the query value R0 is smaller than a third threshold value T3, the step 6 is executed again, the geographic position M is determined as the geographic position of the pseudo base station, and the process is ended. Since it is not necessary to determine whether there is a fake base station again, in step 2, it is only necessary to query the signal strength-geographical location mapping table, obtain the normal signal strength S0 of each frequency band at the current geographical location, and calculate the difference between the first signal strength S1 and the normal signal strength S0.
The pseudo base station identification and positioning method and the vehicle-mounted system can identify the pseudo base station in a simpler mode, do not need to access and demodulate base station signals, do not cause access burden on a normal base station, can overcome the influence of obstacles in a complex urban environment, and can realize accurate positioning of the pseudo base station at a higher speed.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (7)
1. A pseudo base station identification and positioning method comprises the following steps:
step 1, receiving a radio frequency signal through an omnidirectional antenna to obtain a first signal strength S1, and obtaining a current geographic position through a positioning module;
step 2, judging whether a pseudo base station exists according to the first signal strength S1 and the current geographic position, returning to the step 1 when the pseudo base station does not exist, recording the frequency band f of the pseudo base station when the pseudo base station exists, and executing the step 3;
step 3, scanning the directional antenna for 360 degrees to obtain the signal intensity of the radio frequency signal received at the frequency band f in each direction;
step 4, selecting the signal strength with stronger signal strength and the corresponding direction, judging whether the radio frequency signal in the direction comes from the pseudo base station, and if the radio frequency signal comes from the pseudo base station, recording the signal strength of the radio frequency signal received in the direction as a second signal strength S2;
step 5, judging whether an obstacle exists between the vehicle-mounted system and the pseudo base station or not according to the first signal strength S1 and the second signal strength S2;
step 6, if no barrier exists between the vehicle-mounted system and the pseudo base station, determining the geographic position of the pseudo base station;
step 7, if an obstacle exists between the vehicle-mounted system and the pseudo base station, the vehicle-mounted system moves a preset distance along the road in the direction of enhancing the first signal intensity S1, the steps 1-5 are repeatedly executed until the obstacle does not exist between the vehicle-mounted system and the pseudo base station, and the step 6 is executed again;
wherein, step 2 specifically includes:
2.1, inquiring a signal intensity-geographic position mapping table to obtain the normal signal intensity of each frequency band at the current geographic position S0;
2.2, comparing the first signal strength S1 with the normal signal strength S0, and judging whether a pseudo base station exists according to the difference between the first signal strength S1 and the normal signal strength S0;
2.2.1, if the difference between the first signal strength S1 and the normal signal strength S0 is less than the first threshold T1, no pseudo base station exists, and then return to step 1;
2.2.2, if the difference between the first signal strength S1 and the normal signal strength S0 is greater than a first threshold T1, querying and updating the normal base station list;
2.2.3, if a newly installed normal base station exists in the nearby area, the pseudo base station does not exist, the step 1 is returned, otherwise, the pseudo base station exists in the nearby area, and the corresponding frequency band f is recorded.
2. The method according to claim 1, wherein step 4 specifically comprises:
4.1, selecting the signal intensity s1 with the strongest signal intensity and the corresponding direction a 1;
4.2, calculating the distance d1 of the pseudo base station according to the signal strength s 1;
4.3, judging whether the signal strength s1 is greater than a second threshold value T2, if the signal strength s1 is greater than the second threshold value T2, determining a geographic position m1 according to the current geographic position, the distance d1 and the direction a1 of the pseudo base station, inquiring a normal base station list, and judging whether a normal base station exists at the geographic position m 1;
4.4, if there is a normal base station, determining that the radio frequency signal in the direction a1 is from the normal base station, returning to step 4.1, selecting the signal strength S2 with the second highest signal strength and the corresponding direction a2, and so on, and repeating steps 4.1-4.4 until there is no normal base station at the geographic position M determined according to the current geographic position, the distance D of the pseudo base station, and the corresponding direction a, determining that the radio frequency signal in the direction a is from the pseudo base station, and recording the signal strength of the radio frequency signal received in the direction a as the second signal strength S2.
3. The method according to claim 1, wherein step 5 specifically comprises:
5.1, calculating a ratio R, R = (S1-S0)/S2 of the difference between the first signal strength S1 and the normal signal strength S0 and the second signal strength S2, and inquiring a gain ratio R0 of the omnidirectional antenna and the directional antenna;
and 5.2, comparing the ratio R with the query value R0, and if the difference between the ratio R and the query value R is smaller than a third threshold T3, determining that no obstacle exists between the vehicle-mounted system and the pseudo base station, and if the difference between the ratio R and the query value R is larger than a third threshold T3, determining that an obstacle exists between the vehicle-mounted system and the pseudo base station.
4. The method according to claim 2, wherein step 6 specifically comprises:
the geographical location M is determined as the geographical location of the pseudo base station.
5. A vehicle-mounted system comprises an omnidirectional antenna, a directional antenna, a radio frequency receiving device, a signal strength detection module, a processor, a positioning module and a memory,
the radio frequency receiving device receives radio frequency signals from a plurality of base stations including a pseudo base station by utilizing an omnidirectional antenna and a directional antenna;
the signal strength detection module is used for respectively detecting the first signal strength of the radio-frequency signal received by the omnidirectional antenna and the second signal strength of the radio-frequency signal received by the directional antenna;
the processor is used for executing the pseudo base station identification positioning method of any one of claims 1-4;
the positioning module is used for positioning the vehicle-mounted system in real time.
6. The system of claim 5, wherein the radio frequency receiving device does not demodulate the radio frequency signal and does not access the base station.
7. The system of claim 5, wherein the memory stores a list of normal base stations present in each geographic area, a ratio of omni-directional to directional antenna gain R0, and a signal strength-to-geographic location map.
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| CN111935719B (en) | 2020-12-18 |
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