CN114867000B - Emergency rescue information transmission method and device - Google Patents
Emergency rescue information transmission method and device Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000004891 communication Methods 0.000 claims abstract description 13
- 238000012544 monitoring process Methods 0.000 claims description 24
- 238000013507 mapping Methods 0.000 claims description 21
- 230000004927 fusion Effects 0.000 claims description 9
- 238000005070 sampling Methods 0.000 claims description 7
- 238000012546 transfer Methods 0.000 claims description 7
- 230000010354 integration Effects 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/90—Services for handling of emergency or hazardous situations, e.g. earthquake and tsunami warning systems [ETWS]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- 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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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention provides a method and a device for transmitting emergency rescue information, wherein the method comprises the following steps: step 1, acquiring first signal intensity and second signal intensity of current equipment, wherein the first signal is a satellite signal, and the second signal is a mobile network signal; and 2, determining the position of the current equipment according to the first signal intensity and the second signal intensity, and sending the position to a server or/and establishing a communication channel for transmission of rescue information. The invention realizes that the vehicle-mounted emergency rescue system can establish communication connection with the server under various signal conditions, and improves the reliability of emergency rescue.
Description
Technical Field
The invention relates to the technical field of Internet of vehicles, in particular to a method and a device for transmitting emergency rescue information.
Background
ECALL is an emergency call system used after an automobile accident, which can automatically send distress information to a corresponding rescue mechanism to rescue when the automobile accident happens, particularly when personnel in the automobile cannot autonomously call for a help, and can be manually activated through keys. At present, ECALL only has a function of uploading data through a mobile data network and a function of uploading pictures through a camera. However, if the vehicle is in a no-signal area or the signal area is very weak, the system cannot upload data in time and cannot dial over the voice call, which wastes valuable rescue time.
The proposal aims at overcoming the defect that the existing ECALL terminal can only upload information or carry out video and voice communication in the state of having a mobile network, the Beidou navigation system is implanted in the ECALL system, and when no mobile network exists, the function of Beidou information uploading is started, and accident signals (including positions, time, vehicle characteristics and the like) are sent.
Disclosure of Invention
The invention provides a method and a device for transmitting emergency rescue information, which aim to overcome the defects in the prior art, and realize that a vehicle-mounted emergency rescue system can be in communication connection with a server under various signal conditions, so that the reliability of emergency rescue is improved.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
in one aspect, the present invention provides a method for transmitting emergency rescue information, including:
step 1, acquiring first signal intensity and second signal intensity of current equipment, wherein the first signal is a satellite signal, and the second signal is a mobile network signal;
and 2, determining the position of the current equipment according to the first signal intensity and the second signal intensity, and sending the position to a server or/and establishing a communication channel for transmission of rescue information.
Specifically, the step 2 includes:
step 201, setting a trigger threshold of a first signal and a decision counter;
step 202, judging whether the second signal intensity is larger than a second preset signal intensity threshold value, if yes, judging whether the first signal intensity is larger than a first preset signal intensity threshold value, and entering the next step, otherwise, entering step 208;
step 203, determining the position of the current device according to a preset fusion rule, and sending the position or/and establishing video connection through the second signal, otherwise, entering the next step;
step 204, determining the position of the current device according to the second signal, and sending the position or/and establishing video connection through the second signal;
step 205, monitoring the first signal strength, and initializing the decision counter when the first signal strength is equal to or greater than the trigger threshold;
step 206, continuously monitoring the first signal strength at a preset sampling rate within a preset duration, if at least 2 different first signal strengths received by the next sampling are equal to or greater than a first preset signal strength threshold, controlling the decision counter to accumulate in a preset step, otherwise, controlling the decision counter to reduce in a preset multiplying power, and returning to step 204;
step 207, judging whether the decision counter is larger than a decision threshold, if yes, entering step 203, otherwise returning to step 205;
step 208, determining whether the first signal strength is greater than a first preset signal strength threshold, if yes, determining the position of the current device according to the first signal, and sending the position or/and establishing video connection through the first signal, otherwise, prompting failure in positioning.
Specifically, the preset fusion rule includes:
step A, acquiring a first signal and a second signal;
step B, acquiring a first initial position of the current equipment according to the first signal, and acquiring a second initial position of the current equipment according to the second signal;
step C, judging whether the error between the first initial position and the second initial position is smaller than a preset error, if so, using any one of the first initial position and the second initial position as the position of the current equipment, otherwise, entering the next step;
step D, mapping the first initial position and the second initial position to road sections of a navigation map according to a preset mapping rule to respectively obtain a first map matching point and a second map matching point, and obtaining first geographic features and second geographic features corresponding to the first map matching point and the second map matching point;
e, acquiring a panoramic image of the vehicle, and acquiring a third geographic feature around the vehicle through image recognition;
and F, taking the position corresponding to the geographic feature which is most matched with the third geographic feature in the first geographic feature and the second geographic feature as the position of the current equipment.
Specifically, the preset mapping rule includes:
step d1, acquiring an original position point corresponding to an initial position on a map;
step d2, obtaining all road sections in a square area with the original position point as a center and the preset length as a side length, and solving the shortest vertical distance from the original position point to each road section;
step d3, acquiring the current running direction of the vehicle, and solving the included angle between the running direction and each road section;
step d4, calculating the matching value of the initial position and each road section according to the matching relation;
and d5, determining the road section corresponding to the smallest matching value as a matching road section.
Specifically, the matching relation is:
K(i)={max(l -2d(i)/l,0)}*d(i)+{max(1-2|α(i)|/π,0)}*|α(i)|，
wherein K (i) represents a matching value, max { } represents taking the larger operation,lfor the preset side length, d (i) represents the shortest vertical distance from the original position point to each road section, and alpha (i) represents the included angle between the current running direction of the vehicle and each road section.
Further, after the step 2, the method further includes:
step 3, monitoring the residual service life of the battery of the current equipment;
and step 4, if the residual use time is lower than a preset time value, acquiring the pictures in the vehicle at a preset frequency and sending the pictures to a server through a current communication channel.
Specifically, the step 3 includes:
step 301, reading initial voltage, initial current and temperature of a battery of the current device;
step 302, obtaining an initial discharge degree corresponding to the initial voltage;
step 303, calculating the net charge transfer amount;
step 304, obtaining the maximum capacity of the battery, and calculating the current discharging degree according to a preset first relation;
step 305, calculating the current internal resistance of the battery according to a preset second relation;
step 306, obtaining a relation between the open-circuit voltage and the discharge depth, and obtaining the current total running time by iterating a preset third relation;
and 306, obtaining the residual service time according to a preset fourth relation.
Specifically, the first relation is preset to be D (t) =d (0) +q (t)/Qmax, wherein D (t) represents the current discharge degree, D (0) represents the initial discharge degree, Q (t) represents the net charge transfer amount, and Qmax represents the maximum capacity of the battery;
the preset second relation is as follows: r (t) =a (t) ×e [b(t)*T] Wherein R (T) represents the current internal resistance, a (T) represents an impedance coefficient related to the current discharge degree D (T) at the time T, b (T) represents an impedance coefficient related to the temperature T at the time T, and e is a natural number;
the preset third relation is as follows: vc (D (T), T (T)) -I (T) ×r (T) =vmin, where Vmin represents the lowest operating voltage of the system, D (T) represents the current degree of discharge, T (T) represents the current temperature, I (T) represents the current, and R (T) represents the current internal resistance;
the preset fourth relation is: t '=t_total-t, where t' represents the remaining usage time, t_total represents the current total running time, and t represents the integration time.
Another aspect of the present invention provides an emergency rescue information transmission apparatus, including:
the system comprises a transmission link module, a first signal module, a second signal module, a signal monitoring module, an image acquisition module and a position determining module, wherein the first signal module, the second signal module, the signal monitoring module, the image acquisition module and the position determining module are connected with the transmission link module; the system comprises a mapping module, a first initial position module, a second initial position module and a position determining module, wherein the first initial position module and the second initial position module are connected with the mapping module; the image recognition module is connected with the image acquisition module and is also connected with the position determination module;
the first signal module is used for receiving the first signal and establishing a rescue information transmission channel with the server according to the first control signal of the transmission link module;
the second signal module is used for receiving a second signal and establishing a rescue information transmission channel with the server according to a second control signal of the transmission link module;
the signal monitoring module is used for monitoring the second signal intensity and sending the second signal intensity to the transmission link module;
the transmission link module is used for receiving rescue information and selecting a corresponding rescue information transmission channel according to the second signal strength, wherein the rescue information comprises position information and multimedia data sent by the image acquisition module;
the first initial position module is used for determining a first initial position of the current equipment according to the first signal;
the second initial position module is used for determining a second initial position of the current equipment according to the second signal;
the mapping module is used for mapping the first initial position and the second initial position to a navigation map, generating a first map matching point and a second map matching point, and acquiring corresponding first geographic features and second geographic features;
the image acquisition module is used for acquiring video or image information around the vehicle body and in the vehicle;
the image identification module is used for identifying a third geographic feature of the vehicle according to the image acquired by the image acquisition module;
the position determining module is used for determining the position of the current equipment according to the first signal or the second signal or the fusion of the first geographic feature, the second geographic feature and the third geographic feature.
Further, the emergency rescue information transmission device further includes: and the electric quantity monitoring module is connected with the image acquisition module and is used for calculating the residual service time of the battery, and the image acquisition module selects an image acquisition mode according to the residual service time of the battery.
The invention has the beneficial effects that: according to the invention, the first signal intensity and the second signal intensity of the current equipment are obtained, the position of the current equipment is determined according to the first signal intensity and the second signal intensity, the position is sent to the service end, or/and a communication channel for transmitting rescue information is established, and the image obtaining mode can be automatically switched under the condition of insufficient system electric quantity, so that the vehicle-mounted emergency rescue system can be in communication connection with the service end under various signal conditions, and the reliability of emergency rescue is improved.
Drawings
FIG. 1 is a flow chart of an emergency rescue information transmission method of the present invention;
fig. 2 is a schematic structural view of an emergency rescue information transmission device according to the present invention;
fig. 3 is a schematic view of another structure of the emergency rescue information transmission device of the present invention.
Detailed Description
Embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which are for reference and illustration only, and are not intended to limit the scope of the invention.
In the flow described in the description, claims or drawings of the present invention, the serial numbers of the respective steps (e.g., steps 10, 20, etc.) are included, and are only used to distinguish the respective steps, and the serial numbers themselves do not represent any execution sequence. It should be noted that, the descriptions of "first", "second", and the like herein are only for distinguishing the description objects, and do not represent the sequence, nor do they represent that the descriptions of "first", "second", and the like are of different types.
Example 1
Step 1, acquiring first signal strength and second signal strength of current equipment, wherein the first signal is a satellite signal, and the second signal is a mobile network signal.
In this embodiment, the satellite signals may not only provide positioning signals, but may also transmit multimedia communication signals (e.g., video connections).
In this embodiment, the satellite signal is preferably a beidou satellite signal, and may of course be other satellite signals that can satisfy the above functions.
And 2, determining the position of the current equipment according to the first signal intensity and the second signal intensity, and sending the position to a server or/and establishing a communication channel for transmission of rescue information.
In this embodiment, the step 2 includes:
step 201, a trigger threshold W0 of the first signal is set, and a decision counter C (n), n representing the number of samples.
Step 202, judging whether the second signal strength is greater than a second preset signal strength threshold, if yes, judging whether the first signal strength is greater than a first preset signal strength threshold, and entering the next step, otherwise, entering step 208.
Step 203, determining the position of the current device according to a preset fusion rule, and sending the position or/and establishing video connection through the second signal, otherwise, entering the next step.
Step 204, determining the position of the current device according to the second signal, and sending the position or/and establishing video connection through the second signal.
Step 205, monitoring the first signal strength, and initializing the decision counter C (n) when the first signal strength is equal to or greater than the trigger threshold W0.
In a specific implementation, the initializing the decision counter C (n) is to make n=0, and C (0) =0.
Step 206, continuously monitoring the first signal strength at a preset sampling rate within a preset duration, if at least 2 different first signal strengths received by the next sampling are equal to or greater than a first preset signal strength threshold, controlling the decision counter C (n) to accumulate in a preset step (e.g. 1), otherwise controlling the decision counter C (n) to decrease in a preset multiplying power k, and returning to step 204.
In practice, the predetermined time period may be 10 seconds, and the predetermined sampling rate may be 10 times per second. The decision counter C (n) is accumulated in a preset step (e.g. 1), i.e. C (n+1) =c (n) +1; the decision counter C (n) is reduced by a preset multiplying factor k, that is, C (n+1) =c (n) ×k (0 < k <1, for example, 0.4 to 0.6).
Step 207, determining whether the decision counter C (n) is greater than a decision threshold T (e.g. 60), if yes, proceeding to step 203, otherwise returning to step 205.
Step 208, determining whether the first signal strength is greater than a first preset signal strength threshold, if yes, determining the position of the current device according to the first signal, and sending the position or/and establishing video connection through the first signal, otherwise, prompting failure in positioning.
In this embodiment, the preset fusion rule includes:
and step A, acquiring a first signal and a second signal.
And B, acquiring a first initial position of the current equipment according to the first signal, and acquiring a second initial position of the current equipment according to the second signal.
And C, judging whether the error between the first initial position and the second initial position is smaller than a preset error, if so, using any one of the first initial position and the second initial position as the position of the current equipment, otherwise, entering the next step.
And D, mapping the first initial position and the second initial position to road sections of a navigation map according to a preset mapping rule to respectively obtain a first map matching point and a second map matching point, and obtaining first geographic features and second geographic features corresponding to the first map matching point and the second map matching point.
And E, acquiring a panoramic image of the vehicle, and acquiring a third geographic feature around the vehicle through image recognition.
And F, taking the position corresponding to the geographic feature which is most matched with the third geographic feature in the first geographic feature and the second geographic feature as the position of the current equipment.
For example, if the first geographic feature and the second geographic feature are a left lane and a right lane respectively, and the third geographic feature identified by the image is a right lane, determining a second map matching point corresponding to the second geographic feature as the position of the current device.
In this embodiment, the preset mapping rule includes:
and d1, acquiring an original position point P0 corresponding to the initial position on the map.
Step d2, obtaining the original position point P0 as the centerPreset lengthlAll road segments R (i) in the square area with side length are obtained, and the shortest vertical distance d (i) from the original position point P0 to each road segment R (i) is obtained.
Step d3, acquiring the current running direction of the vehicle, and obtaining an included angle alpha (i) between the running direction and each road section R (i).
In this embodiment, the included angle α (i) is 0 degrees in the north direction, the clockwise direction is [0, pi ], and the counterclockwise direction is [0, -pi ].
And d4, calculating a matching value K (i) of the initial position and each road segment R (i) according to a matching relation.
In this embodiment, the matching relation is:
K(i)={max(l-2d(i)/l,0)}*d(i)+{max(1-2|α(i)|/π,0)}*|α(i)|，
wherein K (i) represents a matching value, max { } represents taking the larger operation,lthe side length is preset.
And d5, determining the road segment R (j) corresponding to the smallest one of the matching values K (i) as a matching road segment.
Example 2
Unlike embodiment 1, this embodiment further includes, after step 2:
and 3, monitoring the residual service life of the battery of the current equipment.
And step 4, if the residual use time is lower than a preset time value, acquiring the pictures in the vehicle at a preset frequency and sending the pictures to a server through a current communication channel.
When the electric quantity of the current equipment is too low, the real-time video connection with the server is changed into a picture transmission mode, so that the power consumption of the system can be effectively reduced, and the service time of the equipment is prolonged.
In this embodiment, the step 3 includes:
step 301, reading an initial voltage V (0), an initial current I (0) and a temperature T of a battery of the current device.
In specific implementation, related parameters such as voltage V, current I and temperature T of the battery are read through an ADC (analog to digital converter) built in the battery.
Step 302, obtaining an initial discharge degree D (0) corresponding to the initial voltage V (0).
Step 303, calculating the net charge transfer Q (t).
In this embodiment, the step 303 includes: the net charge transfer is obtained by integrating the initial current I (0) over time t, i.e. Q (t) =i (0) ×t, where t is the integration time.
And 304, obtaining the maximum capacity of the battery, and calculating the current discharging degree according to a preset first relation.
In this embodiment, the first relation is preset as D (t) =d (0) +q (t)/Qmax, where D (t) represents the current discharge degree, D (0) represents the initial discharge degree, Q (t) represents the net charge transfer amount, and Qmax represents the maximum capacity of the battery.
And 305, calculating the current internal resistance of the battery according to a preset second relation.
In this embodiment, the preset second relation is: r (t) =a (t) ×e [b(t)*T] Wherein R (T) represents the current internal resistance, a (T) represents an impedance coefficient related to the current discharge degree D (T) at time T, b (T) represents an impedance coefficient related to the temperature T at time T, and e is a natural number.
In the specific implementation, parameter groups [ D (T), a (T), T, b (T) ] can be set in a database and used for storing the coefficients a (T), b (T) of each discharge degree and temperature.
Step 306, obtaining a relation formula Vc (D (T), T (T)) of the open-circuit voltage Vc, the discharge depth D (T) and the temperature T, and obtaining the current total running time t_total by iterating a preset third relation formula.
In this embodiment, the preset third relation is: vc (D (T), T (T)) -I (T) ×r (T) =vmin, where Vmin represents the lowest operating voltage of the system.
In specific implementation, the relation Vc (D (T), T (T)) can be obtained through calibration.
And 306, obtaining the residual service time according to a preset fourth relation.
The preset fourth relation is: t '=t_total-t, where t' represents the remaining usage time, t_total represents the current total running time, and t represents the integration time.
Example 3
As shown in fig. 2, this embodiment provides an emergency rescue information transmission device, including: the system comprises a transmission link module, a first signal module, a second signal module, a signal monitoring module, an image acquisition module and a position determining module, wherein the first signal module, the second signal module, the signal monitoring module, the image acquisition module and the position determining module are connected with the transmission link module; the system comprises a mapping module, a first initial position module, a second initial position module and a position determining module, wherein the first initial position module and the second initial position module are connected with the mapping module; the image recognition module is connected with the image acquisition module and is also connected with the position determination module;
the first signal module is used for receiving the first signal and establishing a rescue information transmission channel with the server according to the first control signal of the transmission link module;
the second signal module is used for receiving a second signal and establishing a rescue information transmission channel with the server according to a second control signal of the transmission link module;
the signal monitoring module is used for monitoring the second signal intensity and sending the second signal intensity to the transmission link module;
the transmission link module is used for receiving rescue information and selecting a corresponding rescue information transmission channel according to the second signal strength, wherein the rescue information comprises position information and multimedia data sent by the image acquisition module;
the first initial position module is used for determining a first initial position of the current equipment according to the first signal;
the second initial position module is used for determining a second initial position of the current equipment according to the second signal;
the mapping module is used for mapping the first initial position and the second initial position to a navigation map, generating a first map matching point and a second map matching point, and acquiring corresponding first geographic features and second geographic features;
the image acquisition module is used for acquiring video or image information around the vehicle body and in the vehicle;
the image identification module is used for identifying a third geographic feature of the vehicle according to the image acquired by the image acquisition module;
the position determining module is used for determining the position of the current equipment according to the first signal or the second signal or the fusion of the first geographic feature, the second geographic feature and the third geographic feature.
In this embodiment, the first signal module is a beidou satellite module, and the second signal module is a mobile data module.
The working method of the emergency rescue information transmission device of the present embodiment is as shown in embodiment 1, and is not described in detail.
Example 4
As shown in fig. 3, unlike embodiment 3, the emergency rescue information transmission device of the present embodiment further includes: and the electric quantity monitoring module is connected with the image acquisition module and is used for calculating the residual service time of the battery, and the image acquisition module selects an image acquisition mode according to the residual service time of the battery.
The working method of the emergency rescue information transmission device of the present embodiment is as shown in embodiment 2, and is not described in detail.
The above disclosure is illustrative of the preferred embodiments of the present invention and should not be construed as limiting the scope of the invention, which is defined by the appended claims.
Claims (9)
1. An emergency rescue information transmission method, comprising the steps of:
step 1, acquiring first signal intensity and second signal intensity of current equipment, wherein the first signal is a satellite signal, and the second signal is a mobile network signal;
step 2, determining the position of the current equipment according to the first signal intensity and the second signal intensity, and sending the position to a server or/and establishing a communication channel for rescue information transmission;
the step 2 comprises the following steps:
step 201, setting a trigger threshold of a first signal and a decision counter;
step 202, judging whether the second signal intensity is larger than a second preset signal intensity threshold value, if yes, judging whether the first signal intensity is larger than a first preset signal intensity threshold value, and entering the next step, otherwise, entering step 208;
step 203, determining the position of the current device according to a preset fusion rule, and sending the position or/and establishing video connection through the second signal, otherwise, entering the next step;
step 204, determining the position of the current device according to the second signal, and sending the position or/and establishing video connection through the second signal;
step 205, monitoring the first signal strength, and initializing the decision counter when the first signal strength is equal to or greater than the trigger threshold;
step 206, continuously monitoring the first signal strength at a preset sampling rate within a preset duration, if at least 2 different first signal strengths received by the next sampling are equal to or greater than a first preset signal strength threshold, controlling the decision counter to accumulate in a preset step, otherwise, controlling the decision counter to reduce in a preset multiplying power, and returning to step 204;
step 207, judging whether the decision counter is larger than a decision threshold, if yes, entering step 203, otherwise returning to step 205;
step 208, determining whether the first signal strength is greater than a first preset signal strength threshold, if yes, determining the position of the current device according to the first signal, and sending the position or/and establishing video connection through the first signal, otherwise, prompting failure in positioning.
2. The emergency rescue information transmission method according to claim 1, wherein the preset fusion rule includes:
step A, acquiring a first signal and a second signal;
step B, acquiring a first initial position of the current equipment according to the first signal, and acquiring a second initial position of the current equipment according to the second signal;
step C, judging whether the error between the first initial position and the second initial position is smaller than a preset error, if so, using any one of the first initial position and the second initial position as the position of the current equipment, otherwise, entering the next step;
step D, mapping the first initial position and the second initial position to road sections of a navigation map according to a preset mapping rule to respectively obtain a first map matching point and a second map matching point, and obtaining first geographic features and second geographic features corresponding to the first map matching point and the second map matching point;
e, acquiring a panoramic image of the vehicle, and acquiring a third geographic feature around the vehicle through image recognition;
and F, taking the position corresponding to the geographic feature which is most matched with the third geographic feature in the first geographic feature and the second geographic feature as the position of the current equipment.
3. The emergency rescue information transmission method according to claim 2, wherein the preset mapping rule includes:
step d1, acquiring an original position point corresponding to an initial position on a map;
step d2, obtaining all road sections in a square area with the original position point as a center and the preset length as a side length, and solving the shortest vertical distance from the original position point to each road section;
step d3, acquiring the current running direction of the vehicle, and solving the included angle between the running direction and each road section;
step d4, calculating the matching value of the initial position and each road section according to the matching relation;
and d5, determining the road section corresponding to the smallest matching value as a matching road section.
4. The emergency rescue information transmission method according to claim 3, wherein the matching relation is:
K(i)＝{max(l-2d(i)/l,0)}*d(i)+{max(1-2|α(i)|/π,0)}*|α(i)|，
wherein K (i) represents a matching value, max { } represents a larger calculation, l is a preset side length, d (i) represents the shortest vertical distance from an original position point to each road section, and alpha (i) represents the included angle between the current running direction of the vehicle and each road section.
5. The emergency rescue information transmission method according to claim 1, further comprising, after the step 2:
step 3, monitoring the residual service life of the battery of the current equipment;
and step 4, if the residual use time is lower than a preset time value, acquiring the pictures in the vehicle at a preset frequency and sending the pictures to a server through a current communication channel.
6. The emergency rescue information transmission method according to claim 5, wherein the step 3 comprises:
step 301, reading initial voltage, initial current and temperature of a battery of the current device;
step 302, obtaining an initial discharge degree corresponding to the initial voltage;
step 303, calculating the net charge transfer amount;
step 304, obtaining the maximum capacity of the battery, and calculating the current discharging degree according to a preset first relation;
step 305, calculating the current internal resistance of the battery according to a preset second relation;
step 306, obtaining a relation between the open-circuit voltage and the discharge depth, and obtaining the current total running time by iterating a preset third relation;
and 306, obtaining the residual service time according to a preset fourth relation.
7. The emergency rescue information transmission method according to claim 6, wherein the first relation is preset as D (t) =d (0) +q (t)/Qmax, wherein D (t) represents a current discharge degree, D (0) represents an initial discharge degree, Q (t) represents a net charge transfer amount, and Qmax represents a maximum capacity of the battery;
the preset second relation is as follows: r (t) =a (t) ×e [b(t)*T] Wherein R (T) represents the current internal resistance, a (T) represents an impedance coefficient related to the current discharge degree D (T) at the time T, b (T) represents an impedance coefficient related to the temperature T at the time T, and e is a natural number;
the preset third relation is as follows: vc (D (T), T (T)) -I (T) ×r (T) =vmin, where Vmin represents the lowest operating voltage of the system, D (T) represents the current degree of discharge, T (T) represents the current temperature, I (T) represents the current, and R (T) represents the current internal resistance;
the preset fourth relation is: t '=t_total-t, where t' represents the remaining usage time, t_total represents the current total running time, and t represents the integration time.
8. An emergency rescue information transmission device, comprising:
the system comprises a transmission link module, a first signal module, a second signal module, a signal monitoring module, an image acquisition module and a position determining module, wherein the first signal module, the second signal module, the signal monitoring module, the image acquisition module and the position determining module are connected with the transmission link module; the system comprises a mapping module, a first initial position module, a second initial position module and a position determining module, wherein the first initial position module and the second initial position module are connected with the mapping module; the image recognition module is connected with the image acquisition module and is also connected with the position determination module;
the first signal module is used for receiving the first signal and establishing a rescue information transmission channel with the server according to the first control signal of the transmission link module;
the second signal module is used for receiving a second signal and establishing a rescue information transmission channel with the server according to a second control signal of the transmission link module;
the signal monitoring module is used for monitoring the second signal intensity and sending the second signal intensity to the transmission link module;
the transmission link module is used for receiving rescue information and selecting a corresponding rescue information transmission channel according to the second signal strength, wherein the rescue information comprises position information and multimedia data sent by the image acquisition module;
the first initial position module is used for determining a first initial position of the current equipment according to the first signal;
the second initial position module is used for determining a second initial position of the current equipment according to the second signal;
the mapping module is used for mapping the first initial position and the second initial position to a navigation map, generating a first map matching point and a second map matching point, and acquiring corresponding first geographic features and second geographic features;
the image acquisition module is used for acquiring video or image information around the vehicle body and in the vehicle;
the image identification module is used for identifying a third geographic feature of the vehicle according to the image acquired by the image acquisition module;
the position determining module is used for determining the position of the current equipment according to the first signal or the second signal or the fusion of the first geographic feature, the second geographic feature and the third geographic feature.
9. The emergency rescue information transmission device of claim 8, further comprising: and the electric quantity monitoring module is connected with the image acquisition module and is used for calculating the residual service time of the battery, and the image acquisition module selects an image acquisition mode according to the residual service time of the battery.
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