CN109613575B - Early warning method for shielding signal of intelligent positioning device - Google Patents
Early warning method for shielding signal of intelligent positioning device Download PDFInfo
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- CN109613575B CN109613575B CN201811514515.8A CN201811514515A CN109613575B CN 109613575 B CN109613575 B CN 109613575B CN 201811514515 A CN201811514515 A CN 201811514515A CN 109613575 B CN109613575 B CN 109613575B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/38—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system
- G01S19/39—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system the satellite radio beacon positioning system transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/42—Determining position
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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
- G01S19/35—Constructional details or hardware or software details of the signal processing chain
- G01S19/37—Hardware or software details of the signal processing chain
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K3/00—Jamming of communication; Counter-measures
- H04K3/80—Jamming or countermeasure characterized by its function
- H04K3/82—Jamming or countermeasure characterized by its function related to preventing surveillance, interception or detection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K3/00—Jamming of communication; Counter-measures
- H04K3/80—Jamming or countermeasure characterized by its function
- H04K3/90—Jamming or countermeasure characterized by its function related to allowing or preventing navigation or positioning, e.g. GPS
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K2203/00—Jamming of communication; Countermeasures
- H04K2203/10—Jamming or countermeasure used for a particular application
- H04K2203/22—Jamming or countermeasure used for a particular application for communication related to vehicles
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- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Position Fixing By Use Of Radio Waves (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The invention discloses an early warning method for shielding signals of an intelligent positioning device, which is characterized by comprising the following steps of: monitoring data packets uploaded by the vehicle-mounted equipment in real time, and executing the following steps when the information carried by the adjacent data packets is changed from carrying positioning information to positioning information and is lost: judging whether the vehicle belongs to a first state or a second state; a determination step of determining that the vehicle is in the first state; a step of determining a driving state when the vehicle is in the second state; a step of determining that the vehicle is traveling normally; and a step of determining that the vehicle is running abnormally. The invention can quickly, accurately and comprehensively monitor whether the positioning signals under various vehicle running states are shielded or not. The operation response is timely, and the calculated amount is small.
Description
Technical Field
The invention relates to the field of vehicle networking, in particular to an early warning method for shielding signals of an intelligent positioning device.
Background
As the amount of automobiles kept increases, the number of stolen vehicles increases, and for the recovery or monitoring of stolen vehicles (or other situations), the positioning information of the vehicles needs to be grasped.
In the existing GPS positioning scheme, there are situations of missing positioning, including missing positioning signals due to objective reasons, and being considered malicious masks. The current scheme for checking that the positioning signal is shielded by the malicious chip is as follows: 1. detecting whether the GPS positioning is effective, if the GPS positioning is ineffective, judging that suspicion that the GPS antenna is shielded to cause incapability of positioning exists, and judging whether the phenomenon that the GPS positioning is ineffective is caused by shielding signals through an SNR (signal to noise ratio) algorithm; if the result of the calculation is true, it is confirmed that the GPS antenna is maliciously shielded, for example, a car-positioning-prevention shielding system disclosed in CN 107290759A. 2. A pair of invisible light emitters and receivers are arranged in a GPS antenna receiving head, wherein the emitters are responsible for emitting invisible light signals with specified wavelengths outwards, and the receivers are responsible for receiving the invisible light signals; the transmitter sends invisible light signals with specified wavelength, and whether a shelter exists outside the GPS antenna is judged by detecting whether the receiver receives the signals; if the receiver receives the invisible light signal with the specified wavelength sent by the transmitter, the GPS antenna is indicated to be maliciously shielded.
In the above scheme 1, the positioning signal loss in all states of the vehicle cannot be determined in a targeted manner, and the reliability of the determination result is low; meanwhile, a large amount of data needs to be subjected to statistical analysis, the calculation amount is large, and the influence of noise interference on the situation is serious. In the scheme 2, the judgment needs to be carried out by means of extra facilities, so that the stability is weak, and the power consumption is high; meanwhile, the principle of the method is easy to be artificially utilized, so that the judgment result is inconsistent with the actual result, and the reliability is also low.
Disclosure of Invention
The invention aims to: aiming at the existing problems, the early warning method for shielding the signal of the intelligent positioning device is provided to accurately, quickly and categorically judge whether the GPS positioning signal of the vehicle is maliciously shielded or not.
The technical scheme adopted by the invention is as follows:
an early warning method for shielded signals of an intelligent positioning device comprises the following steps:
A. monitoring data packets uploaded by the vehicle-mounted equipment in real time, and executing subsequent steps when the information carried by adjacent data packets is changed from carrying positioning information to positioning information and is lost;
B. storing the data packet uploaded by the vehicle-mounted equipment; judging whether the vehicle belongs to a first state or a second state according to the acceleration information of the two adjacent data packets;
C. when the vehicle is in the first state, judging whether the signal of the positioning device is shielded or not according to the positioning information data in the stored data packet;
D. when the vehicle is in the second state, judging whether the vehicle is in a normal driving state or not according to the positioning information data and the acceleration data in the stored data packet;
E. when the vehicle runs normally, judging that the signal of the positioning device is shielded;
F. when the vehicle runs abnormally, base station information corresponding to the positioning information in a data packet carrying the positioning information recently is found out, the GPS blind area occupation ratio of the base station is inquired, the positioning information data in the stored data packet is counted, and when the counted result and the GPS blind area occupation ratio of the base station meet a preset relation, the signal of the positioning device is judged to be shielded.
When the vehicle-mounted equipment fails to feed back the positioning information, judging whether the vehicle is in a running state or a stopping state according to the vehicle acceleration information, if the vehicle is in the stopping state, then, according to the positioning information data in the data packet fed back by the vehicle-mounted equipment, it can be determined that the vehicle positioning signal is shielded, if the vehicle is in a driving state, then, according to the positioning information and the acceleration data (based on the statistical analysis principle, the influence caused by the abnormal individual data packet is reduced), whether the vehicle runs normally is judged, when the vehicle is running normally, according to the condition that the positioning is lost in a plurality of data packets, the positioning signal can be judged to be shielded, when the vehicle runs abnormally, according to the statistical result of the positioning information of the data packet and the proportion of the positioning blind area of the base station in the area (namely, based on the comparison of the upper limit of the positioning blind area), the positioning signal can be judged to be shielded (caused by unnaturalness). According to the method, whether the positioning signal is maliciously shielded or not can be accurately judged according to various running states of the vehicle without additional facilities, the data calculation amount is small, and the calculation precision is high. The judgment of the result adopts a step-by-step judgment mode, so that the condition that the positioning signals are shielded can be judged with the minimum calculation amount (without calculating all data packet data).
Further, the data packet uploaded by the storage vehicle-mounted device is: when the positioning information data of two adjacent data packets are lost from carrying positioning information to positioning information, caching the data packets uploaded by all subsequent vehicle-mounted equipment; otherwise, only caching the last data packet uploaded by the vehicle-mounted equipment.
According to the scheme, only the data packets which are possibly used for judgment are stored (not all the data packets are stored), so that the space required for storing the data packets can be effectively reduced, and the query time required for extracting the data from the data packets is reduced.
Further, the method for judging whether the vehicle belongs to the first state or the second state comprises the following steps: and if the acceleration of the two adjacent data packets is greater than a preset acceleration threshold value, judging that the vehicle is in a first state, otherwise, judging that the vehicle is in a second state.
The vehicle running state is judged based on the acceleration values before and after the suspected positioning signal is shielded, the result is accurate, the time is accurate, the joint judgment is carried out based on the acceleration values of two continuous data packets, and the accurate result can be obtained by the least calculation amount.
Further, when the vehicle is in the first state, the determining whether the signal of the positioning device is shielded according to the positioning information data in the stored data packet is as follows: and judging whether the signals of the positioning device are shielded or not according to the statistical data of the data packet with the missing positioning information in the stored data packets.
Based on the statistics of the absence of vehicle locating information in the first state (stopped state), it can be quickly determined whether the locating signal is masked.
Further, the determining whether the signal of the positioning device is masked according to the statistical data of the data packet with missing positioning information in the stored data packets is as follows: and judging that the signal of the positioning device is shielded when the number of the data packets continuously generating the positioning information loss reaches a first threshold value.
The positioning information of a plurality of continuous data packets is analyzed and confirmed, so that the accuracy and efficiency of result judgment can be improved.
Further, the method for determining whether the vehicle is in a normal driving state includes: determining whether to enter a state decision mode according to positioning information data in the stored data packet; state determination mode: extracting acceleration data in the stored data packet, calculating a median value, and calculating a mean value after removing a maximum value and a minimum value; calculating the difference value between the mean value and the median value; and when the mean value, the median value and the difference value all meet a first preset condition, judging that the vehicle is in a normal running state.
The most value of the acceleration is filtered, the influence of the positioning drift on the result can be reduced, the accuracy of the data packet result can be accurately judged based on the difference value relation between the average value of the acceleration and the median value, and further, the driving state of the vehicle can be accurately and quickly judged based on the average value of the acceleration, the median value and the difference value.
Further, the determining whether to enter the state determination mode according to the positioning information data in the stored data packet is: and entering a state judgment mode when the number of data packets in which the loss of the positioning information continuously occurs among the stored data packets reaches a second threshold value.
On the one hand, based on the statistical analysis of the data packets with the continuous positioning loss, the conditions for entering state judgment can be strictly screened, and further, the data calculation amount is effectively saved; on the other hand, the set triggering condition can also prevent false triggering of the subsequent steps, which causes false judgment of the result.
Further, when the mean value, the median value and the difference value all satisfy a first preset condition, it is determined that the vehicle is in a normal driving state: when the difference value is equal to or less than a third threshold value, when the mean value is equal to or more than a fourth threshold value, and when the median value is equal to or more than a fifth threshold value, it is determined that the vehicle is in a normal running state.
The threshold values are set for the three parameters, so that the driving state of the vehicle can be accurately and quickly judged in a simple and direct mode.
Further, in the step F, the step of counting the positioning information data in the data packet is: counting the ratio of the data packets with missing positioning information to the total stored data packets in the stored data packets; the ratio of the statistical result to the GPS blind area of the base station meets a preset relationship: the occupation ratio of the data packet with the missing positioning information is higher than the GPS blind area occupation ratio of the base station.
The positioning missing data packet is subjected to statistical analysis based on the maximum range of the base station positioning blind area, whether the positioning signal caused by the base station coverage quality is shielded or not can be judged visually, meanwhile, the specific positioning blind areas of the base stations do not need to be matched one by one, and the objective reason that the positioning signal is shielded can be quickly determined.
Further, the GPS dead zone percentage of the inquiry base station is: inquiring the GPS blind area occupation ratio of the base stations from prestored base station information of a plurality of base stations; the base station information includes a GPS dead zone fraction of the base station.
The base station information of a plurality of commonly used base stations is prestored, so that the corresponding base station information can be quickly inquired when the base station information needs to be called, the response speed of data processing is further improved, the operation load of equipment is reduced, and the calculation efficiency is improved.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the invention can quickly, accurately and comprehensively monitor whether the positioning signals under various vehicle running states are shielded or not. The operation response is timely, and the calculated amount is small.
2. The invention can accurately judge the running state of the vehicle with the shielded positioned signal, so as to more comprehensively know the vehicle state and conveniently analyze and position the missing reason.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
fig. 1 is a flow chart of an early warning method for shielding of signals of an intelligent positioning device.
Fig. 2 is one embodiment of an early warning method in which an intelligent locator signal is masked.
Detailed Description
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification (including any accompanying claims, abstract) may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
As shown in fig. 1, the embodiment discloses an early warning method for shielding signals of an intelligent positioning device, which includes the following steps:
and monitoring data packets uploaded by the vehicle-mounted equipment in real time, and executing subsequent steps when the information carried by the adjacent data packets is changed from carrying positioning information to positioning information and is lost.
Storing the data packet uploaded by the vehicle-mounted equipment; and judging whether the vehicle belongs to the first state or the second state according to the acceleration information of the two adjacent data packets. The method for judging whether the vehicle belongs to the first state or the second state comprises the following steps: and if the acceleration of the two adjacent data packets is larger than a preset acceleration threshold (such as 100), judging that the vehicle is in a first state, otherwise, judging that the vehicle is in a second state. For the storage of the data packets uploaded by the vehicle-mounted equipment, when the positioning information data of two adjacent data packets is changed from carrying positioning information to missing positioning information, caching the data packets uploaded by all subsequent vehicle-mounted equipment; otherwise, only caching the last data packet uploaded by the vehicle-mounted equipment.
When the vehicle is in the first state, whether the signal of the positioning device is shielded is judged according to the positioning information data in the stored data packet. Specifically, it is determined whether or not the positioning device signal is masked based on the statistical data of the packet in which the lack of positioning information occurs among the stored packets. In one embodiment, the determination that the locator signal is masked is made based on a count of the number of data packets in which the lack of locating information continuously occurs among the stored data packets reaching a first threshold (e.g., 5).
And when the vehicle is in the second state, judging whether the vehicle is in a normal driving state or not according to the positioning information data and the acceleration data in the stored data packet.
The method for judging whether the vehicle is in the normal running state comprises the following steps: determining whether to enter a state decision mode according to positioning information data in the stored data packet; specifically, when the number of data packets in which the missing of the positioning information continuously occurs among the stored data packets reaches a second threshold (e.g., 5), the state determination mode is entered;
state determination mode: extracting acceleration data in the stored data packet, calculating a median value, and calculating a mean value after removing a maximum value and a minimum value; calculating the difference (absolute value) between the mean and median values; and when the mean value, the median value and the difference value all meet a first preset condition, judging that the vehicle is in a normal running state. Specifically, when the difference value is equal to or less than a third threshold value (e.g., 50), when the average value is equal to or more than a fourth threshold value (e.g., 200), and when the median value is equal to or more than a fifth threshold value (e.g., 200), it is determined that the vehicle is in the normal running state.
When the vehicle is running normally, it is determined that the positioner signal is masked.
When the vehicle runs abnormally, base station information corresponding to the positioning information in a data packet carrying the positioning information recently is found out, the GPS blind area occupation ratio of the base station is inquired, the positioning information data in the stored data packet is counted, and when the counted result and the GPS blind area occupation ratio of the base station meet a preset relation, the signal of the positioning device is judged to be shielded. Specifically, the positioning information data in the data packet is counted as: counting the ratio of the data packets with missing positioning information to the total stored data packets in the stored data packets; the ratio of the statistical result to the GPS blind area of the base station meets a preset relationship: the occupation ratio of the data packet with the missing positioning information is higher than the GPS blind area occupation ratio of the base station.
The embodiment discloses an early warning method for shielding signals of an intelligent positioning device, which comprises the following steps:
monitoring data packets uploaded by the vehicle-mounted equipment in real time, and executing the next step when the information carried by the adjacent data packets is changed from carrying positioning information to positioning information and is lost;
caching data packets uploaded by all subsequent vehicle-mounted devices; if the acceleration of the two adjacent data packets is larger than a preset acceleration threshold, judging that the vehicle is in a first state, otherwise, judging that the vehicle is in a second state;
when the vehicle is in a first state, and the number of data packets continuously subjected to positioning information loss in the stored data packets reaches a first threshold value, judging that a positioning device signal is shielded;
when the vehicle is in a second state, in the stored data packets, when the number of the data packets continuously generating the positioning information loss reaches a second threshold value, entering a state judgment mode; state determination mode: extracting acceleration data in the stored data packet, calculating a median value, and calculating a mean value after removing a maximum value and a minimum value; calculating a difference value between the mean value and a median value, and determining that the vehicle is in a normal driving state when the difference value is equal to or less than a third threshold value, when the mean value is equal to or more than a fourth threshold value, and when the median value is equal to or more than a fifth threshold value;
when the vehicle runs normally, judging that the signal of the positioning device is shielded;
when the vehicle runs abnormally, base station information corresponding to the positioning information in a data packet which carries the positioning information recently is found out, and the GPS dead zone ratio of the base station is inquired; counting the ratio of the data packets with missing positioning information to the total stored data packets in the stored data packets; and when the occupation ratio of the data packet with the missing positioning information is higher than the GPS blind area occupation ratio of the base station, judging that the signal of the positioning device is shielded.
As shown in fig. 2, the embodiment discloses another warning method for shielding signals of an intelligent positioning device, which includes the following steps:
pre-storing base station information of a plurality of LBS base stations, wherein each base station information comprises a GPS blind area ratio of a corresponding base station;
monitoring a data packet uploaded by the vehicle-mounted equipment in real time, wherein the vehicle-mounted equipment acquires and uploads the data packet at a preset frequency (such as 2 Hz), and the data packet comprises a triaxial acceleration value of the vehicle-mounted equipment; when the information carried by the adjacent data packet is changed from carrying positioning information to positioning information loss, executing the next step;
caching data packets uploaded by all subsequent vehicle-mounted devices; if the acceleration of the two adjacent data packets is greater than 100, judging that the vehicle is in a running state, otherwise, judging that the vehicle is in a stop state;
when the vehicle is in a stop state, and the number of the data packets continuously generating positioning information loss reaches 5 in the stored data packets, judging that the signals of the positioning device are shielded;
when the vehicle is in a driving state, when the number of data packets in which the loss of the positioning information continuously occurs among the stored data packets reaches 5, entering a state determination mode; state determination mode: extracting acceleration data in the stored data packet, calculating a median value, and calculating a mean value after removing a maximum value and a minimum value; calculating a difference (absolute value) between the mean value and the median value, and determining that the vehicle is in a normal running state when the difference is <50, when the mean value >200, and when the median value > 200;
when the vehicle runs normally, judging that the signal of the positioning device is shielded;
when the vehicle runs abnormally, base station information corresponding to the positioning information in a data packet which carries the positioning information recently is found out, and the GPS dead zone occupation ratio of the base station is inquired based on an LBS positioning server; counting the ratio of the data packets with missing positioning information to the total stored data packets in the stored data packets; and when the occupation ratio of the data packet with the missing positioning information is higher than the GPS blind area occupation ratio of the base station, judging that the signal of the positioning device is shielded.
The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed.
Claims (8)
1. An early warning method for shielded signals of an intelligent positioning device is characterized by comprising the following steps:
A. monitoring data packets uploaded by the vehicle-mounted equipment in real time, and executing subsequent steps when the information carried by adjacent data packets is changed from carrying positioning information to positioning information and is lost;
B. storing the data packet uploaded by the vehicle-mounted equipment; judging whether the vehicle belongs to a first state or a second state according to the acceleration information of the two adjacent data packets; the method for judging whether the vehicle belongs to the first state or the second state comprises the following steps: if the acceleration of the two adjacent data packets is larger than a preset acceleration threshold, judging that the vehicle is in a first state, otherwise, judging that the vehicle is in a second state;
C. when the vehicle is in the first state, judging whether the signal of the positioning device is shielded or not according to the positioning information data in the stored data packet;
D. when the vehicle is in the second state, judging whether the vehicle is in a normal driving state or not according to the positioning information data and the acceleration data in the stored data packet; the method for judging whether the vehicle is in a normal driving state comprises the following steps: determining whether to enter a state decision mode according to positioning information data in the stored data packet; state determination mode: extracting acceleration data in the stored data packet, calculating a median value, and calculating a mean value after removing a maximum value and a minimum value; calculating the difference value between the mean value and the median value; when the mean value, the median value and the difference value all meet a first preset condition, judging that the vehicle is in a normal running state;
E. when the vehicle runs normally, judging that the signal of the positioning device is shielded;
F. when the vehicle runs abnormally, base station information corresponding to the positioning information in a data packet carrying the positioning information recently is found out, the GPS blind area occupation ratio of the base station is inquired, the positioning information data in the stored data packet is counted, and when the counted result and the GPS blind area occupation ratio of the base station meet a preset relation, the signal of the positioning device is judged to be shielded.
2. The warning method according to claim 1, wherein in the step B, the data packet uploaded by the vehicle-mounted device is stored as: when the positioning information data of two adjacent data packets are lost from carrying positioning information to positioning information, caching the data packets uploaded by all subsequent vehicle-mounted equipment; otherwise, only caching the last data packet uploaded by the vehicle-mounted equipment.
3. The warning method as claimed in claim 1, wherein in step C, when the vehicle is in the first state, the determining whether the signal of the positioning device is masked according to the positioning information data in the stored data packet is as follows: and judging whether the signals of the positioning device are shielded or not according to the statistical data of the data packet with the missing positioning information in the stored data packets.
4. The warning method as claimed in claim 3, wherein the determining whether the signal of the positioning device is masked is performed according to statistical data of data packets in which the positioning information is missing, among the stored data packets, as follows: and judging that the signal of the positioning device is shielded when the number of the data packets continuously generating the positioning information loss reaches a first threshold value.
5. The warning method as claimed in claim 1, wherein the determining whether to enter the state decision mode according to the positioning information data in the stored data packet is: and entering a state judgment mode when the number of data packets in which the loss of the positioning information continuously occurs among the stored data packets reaches a second threshold value.
6. The early warning method as claimed in claim 1 or 5, wherein when the mean value, the median value and the difference value all meet a first preset condition, the vehicle is determined to be in a normal driving state: when the difference value is equal to or less than a third threshold value, when the mean value is equal to or more than a fourth threshold value, and when the median value is equal to or more than a fifth threshold value, it is determined that the vehicle is in a normal running state.
7. The warning method according to claim 1, wherein in the step F, the step of counting the positioning information data in the data packet comprises: counting the ratio of the data packets with missing positioning information to the total stored data packets in the stored data packets; the ratio of the statistical result to the GPS blind area of the base station meets a preset relationship: the occupation ratio of the data packet with the missing positioning information is higher than the GPS blind area occupation ratio of the base station.
8. The early warning method as claimed in any one of claims 1 to 5 and 7, wherein the GPS dead zone percentage of the inquiry base station is as follows: inquiring the GPS blind area occupation ratio of the base stations from prestored base station information of a plurality of base stations; the base station information includes a GPS dead zone fraction of the base station.
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| CN105469471A (en) * | 2014-08-19 | 2016-04-06 | 厦门雅迅网络股份有限公司 | Vehicle monitoring method of local vehicle locking |
| CN206021469U (en) * | 2015-11-06 | 2017-03-15 | 广东华浩科技有限公司 | A kind of anti-theft tracking system |
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| CN105513158A (en) * | 2016-02-02 | 2016-04-20 | 北京小米移动软件有限公司 | Method and device for realizing vehicle monitoring |
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