A method and system for determining the location of a mobile terminal in a viaduct area

Abstract

The embodiment of the present specification provides a method for judging the position of a mobile terminal in a viaduct area, which comprises determining the satellite signal rule of at least one side of the current road based on the current position being in the viaduct area; and determining the judgment result for the current position based on the satellite signal rule of at least one side of the current road, the judgment result comprising that the current position is under the viaduct or on the viaduct.

Description

Technical Field

[0001] This specification relates to the field of road traffic navigation, and in particular to a method and system for determining the location of a mobile terminal in an elevated bridge area. Background Technology

[0002] With the continuous development of communication technology and the Global Navigation Satellite System (GNSS), navigation systems have emerged, greatly facilitating people's accurate arrival at their destinations by planning driving routes in complex road environments. However, with urban development, the number and types of roads are increasing, and various roads may overlap in location, making it impossible to determine whether a vehicle is on or below an elevated road.

[0003] Therefore, it is desirable to provide a method and system for determining the location of a mobile terminal in an elevated bridge area, which can accurately determine whether the vehicle is on or under the elevated bridge. Summary of the Invention

[0004] One embodiment of this specification provides a method for determining the location of a mobile terminal in an elevated bridge area. The method for determining the location of a mobile terminal in an elevated bridge area includes: determining the satellite signal patterns on at least one side of the current road based on the current location being in the elevated bridge area; and determining a determination result for the current location based on the satellite signal patterns on at least one side of the current road, wherein the determination result includes whether the current location is under the elevated bridge or on the elevated bridge.

[0005] One embodiment of this specification provides a system for determining the location of a mobile terminal in an elevated bridge area. The system for determining the location of a mobile terminal in an elevated bridge area includes: a determining module, used to determine the satellite signal pattern of at least one side of the current road based on the current location being located in the elevated bridge area; and a judging module, used to determine a judgment result for the current location based on the satellite signal pattern of at least one side of the current road, the judgment result including whether the current location is under the elevated bridge or on the elevated bridge.

[0006] One embodiment of this specification provides an apparatus for determining the location of a mobile terminal in an elevated bridge area. The apparatus includes at least one processor and at least one memory; the at least one memory is used to store computer instructions; the at least one processor is used to execute at least a portion of the computer instructions to implement the method for determining the location of a mobile terminal in an elevated bridge area as described in any of the above embodiments.

[0007] One embodiment of this specification provides a computer-readable storage medium storing computer instructions that, when executed by a processor, implement the method for determining the location of a mobile terminal in an elevated bridge area as described in any of the above embodiments. Attached Figure Description

[0008] This specification will be further described by way of exemplary embodiments, which will be described in detail with reference to the accompanying drawings. These embodiments are not limiting; in these embodiments, the same reference numerals denote the same structures, wherein:

[0009] Figure 1 This is a schematic diagram illustrating an application scenario of a system for determining the location of a mobile terminal in an elevated bridge area, based on some embodiments of this specification.

[0010] Figure 2 This is an exemplary flowchart of a method for determining the location of a mobile terminal in an elevated bridge area, according to some embodiments of this specification;

[0011] Figure 3 This is an exemplary flowchart illustrating the determination of a judgment result according to some embodiments of this specification;

[0012] Figure 4A This is a schematic diagram illustrating a mobile terminal receiving satellite signals according to some embodiments of this specification;

[0013] Figure 4B This is yet another schematic diagram illustrating a mobile terminal receiving satellite signals according to some embodiments shown in this specification;

[0014] Figure 5 This is yet another exemplary flowchart illustrating the determination of a judgment result according to some embodiments shown in this specification;

[0015] Figure 6A This is yet another schematic diagram illustrating a mobile terminal receiving satellite signals according to some embodiments shown in this specification;

[0016] Figure 6B This is yet another schematic diagram illustrating a mobile terminal receiving satellite signals according to some embodiments shown in this specification;

[0017] Figure 7 This is yet another exemplary flowchart illustrating the determination of a judgment result according to some embodiments shown in this specification;

[0018] Figure 8 This is a schematic diagram illustrating the determination of satellites on both sides of a road, based on some embodiments of this specification. Detailed Implementation

[0019] To more clearly illustrate the technical solutions of the embodiments in this specification, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are merely some examples or embodiments of this specification. For those skilled in the art, these drawings can be applied to other similar scenarios without creative effort. Unless obvious from the context or otherwise specified, the same reference numerals in the drawings represent the same structures or operations.

[0020] It should be understood that the terms “system,” “device,” “unit,” and / or “module” used herein are one way to distinguish different components, elements, parts, sections, or assemblies at different levels. However, if other terms can achieve the same purpose, they may be replaced by other expressions.

[0021] As indicated in this specification and claims, unless the context clearly indicates otherwise, the words "a," "an," "an," and / or "the" do not specifically refer to the singular and may also include the plural. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of expressly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements.

[0022] Flowcharts are used in this specification to illustrate the operations performed by the system according to embodiments of this specification. It should be understood that the preceding or following operations are not necessarily performed in exact order. Instead, the steps can be processed in reverse order or simultaneously. Furthermore, other operations can be added to these processes, or one or more steps can be removed from them.

[0023] Figure 1 This is a schematic diagram illustrating an application scenario of a system for determining the location of a mobile terminal in an elevated bridge area, based on some embodiments of this specification.

[0024] In some embodiments, the system 100 for determining the location of a mobile terminal in an elevated bridge area can implement the methods and / or processes disclosed in this specification to determine the location of the mobile terminal in the elevated bridge area. Figure 1 As shown, the application scenarios of the system 100 for determining the location of a mobile terminal in the elevated bridge area may include the mobile terminal 110, the road 120, the vehicle 130, and the positioning system 140.

[0025] Mobile terminal 110 may refer to one or more terminal devices or software used by a user. In some embodiments, the user of mobile terminal 110 may be any user. In some embodiments, mobile terminal 110 may be a terminal used by a driver of vehicle 130. For example, the driver uses mobile terminal 110 for navigation while driving vehicle 130.

[0026] In some embodiments, the mobile terminal 110 may be one or any combination of a mobile device 110-1, a tablet computer 110-2, a laptop computer 110-3, or other devices with input and / or output functions. In some embodiments, the mobile terminal 110 may store road network information and / or road information. In some embodiments, the mobile terminal 110 may obtain road network information and / or road information through a network.

[0027] In some embodiments, the mobile terminal 110 can communicate with the positioning system 140 to receive signals transmitted by one or more satellites in the positioning system 140. The signal transmitted by a satellite may contain satellite-related information about that satellite.

[0028] In some embodiments, the mobile terminal 110 may include a processor. The processor is used to process received data or information. For example, the processor may determine the position of a satellite relative to the road 120 (e.g., the satellite is located on the side of the road 120) based on the azimuth angles of various satellites transmitted by the positioning system 140. As another example, the processor may determine whether the vehicle 130 or the mobile terminal 110 is above or below an overpass based on signal information from satellites on one and / or both sides of the road 120. For instance, the processor may determine whether the vehicle 130 is above or below an overpass based on satellite signal patterns on at least one side of the road 120. As yet another example, the processor may determine whether the vehicle 130 is above or below an overpass based on satellite signal patterns on at least one side of the road 120 and the slope information of the road 120.

[0029] Road 120 may refer to the road on which vehicle 130 travels. In some embodiments, road 120 is a road in an elevated bridge area, and road 120 may include elevated road 120-1, under-elevation road 120-2, etc., with elevated road 120-1 located above under-elevation road 120-2.

[0030] Vehicle 130 can travel on road 120. For example, vehicle 130-1 can travel on road 120-1 above the overpass, and vehicle 130-2 can travel on road 120-2 below the overpass. When driving vehicle 130, the user can place mobile terminal 110 inside the vehicle 130. The position of mobile terminal 110 can change as vehicle 130 moves, and the location information of mobile terminal 110 can be considered as the location information of vehicle 130.

[0031] Positioning system 140 can be used to determine the location information of mobile terminal 110. Positioning system 140 can be a Global Navigation Satellite System (GNSS), etc. Positioning system 140 can include one or more satellites, such as satellite 140-1, satellite 140-2, satellite 140-3, and satellite 140-4. Satellites 140-1 to 140-4 can be located at different positions above road 120 and communicate with mobile terminal 110 to determine the location information of mobile terminal 110. Satellites (e.g., satellites 140-1 to 140-4) can send satellite signals to mobile terminal 110, which may contain satellite-related information.

[0032] In some embodiments, the processor of a mobile terminal (e.g., mobile terminal 110) may include a determining module and a judging module.

[0033] The determination module can be used to determine the satellite signal patterns on at least one side of the current road, based on the current location being in an elevated area.

[0034] The judgment module can be used to determine the judgment result for the current location based on the satellite signal patterns on at least one side of the current road. The judgment result includes whether the current location is under the overpass or on the overpass.

[0035] In some embodiments, the satellite signal pattern on at least one side of the current road includes the difference between the satellite signals on both sides of the current road. The determination module can be used to determine whether the difference between the satellite signals on both sides of the current road meets a first preset condition; in response to the difference meeting the first preset condition, it is determined that the current location is under the overpass.

[0036] In some embodiments, the satellite signal pattern on at least one side of the current road includes: the satellite signal change pattern on at least one side of the current road during the movement of the vehicle where the mobile terminal is located. The determination module is further configured to determine whether the satellite signal change pattern on at least one side of the current road during the movement of the vehicle where the mobile terminal is located meets a second preset condition; in response to meeting the second preset condition, it is determined that the current location is under the overpass.

[0037] In some embodiments, the judgment module can be used to determine the judgment result of the current location based on the satellite signal pattern and the current road slope information.

[0038] For more information on the determination and judgment modules, please refer to [link to relevant documentation]. Figures 2-7 The details and related descriptions will not be repeated here.

[0039] It should be understood that the above modules can be implemented in various ways. For example, in some embodiments, the system and its modules can be implemented by hardware, software, or a combination of software and hardware. The hardware portion can be implemented using dedicated logic; the software portion can be stored in memory and executed by an appropriate instruction execution system, such as a microprocessor or dedicated hardware. Those skilled in the art will understand that the above methods and systems can be implemented using computer-executable instructions and / or included in processor control code, for example, on a carrier medium such as a disk, CD, or DVD-ROM, a programmable memory such as read-only memory (firmware), or a data carrier such as an optical or electronic signal carrier. The systems and modules of this specification can be implemented not only by hardware circuits such as very large-scale integrated circuits or gate arrays, semiconductors such as logic chips, transistors, or programmable hardware devices such as field-programmable gate arrays, programmable logic devices, etc., but also by software, for example, executed by various types of processors, or by a combination of the above hardware circuits and software (e.g., firmware).

[0040] It should be noted that the above description of the system and its modules is for convenience only and should not be construed as limiting this specification to the scope of the illustrated embodiments. It is understood that those skilled in the art, after understanding the principles of the system, may arbitrarily combine the various modules or construct subsystems connected to other modules without departing from these principles. In some embodiments, Figure 1 The determining module and the judging module disclosed herein can be different modules within a system, or a single module can implement the functions of two or more of the aforementioned modules. For example, modules can share a single storage module, or each module can have its own separate storage module. Such variations are all within the scope of protection of this specification.

[0041] Figure 2 This is an exemplary flowchart illustrating a method for determining the location of a mobile terminal in an elevated bridge area according to some embodiments of this specification. In some embodiments, process 200 may be executed by the mobile terminal 110. Figure 2 As shown, process 200 may include the following steps:

[0042] Step 210: Based on the current location being in an elevated bridge area, determine the satellite signal pattern on at least one side of the current road. In some embodiments, step 210 may be performed by a determination module.

[0043] The current location can refer to the location of the mobile terminal (e.g., mobile terminal 110) at the current time. The location of the mobile terminal can also represent the location of the vehicle; that is, the current location is also the location of the vehicle at the current time. In some embodiments, the determining module can determine the current location of the mobile terminal in various ways. For example, the determining module can determine the current location based on positioning systems such as GPS and GNSS.

[0044] An elevated highway area can refer to a road area that includes elevated highways. An elevated highway area can include elevated highway roads above ground level (i.e., roads above the elevated highways) and auxiliary roads below the elevated highways located at ground level (i.e., roads below the elevated highways). In some embodiments, an elevated highway area may also include uphill sections at elevated highway entrances, downhill sections at elevated highway exits, etc.

[0045] In some embodiments, the determining module can determine whether the current location is located in an elevated bridge area based on the mobile terminal's current location and road network information and / or road information. For example, the determining module can filter road information and road network information to filter out roads in the elevated bridge area (e.g., roads on or under the elevated bridge). If the distance between the current location and the location point of the elevated bridge entrance is less than a threshold, it is said that the current location is in the elevated bridge area; or, if the road where the current location is located matches a road in the elevated bridge area, it is said that the current location is in the elevated bridge area.

[0046] Road network information refers to road information consisting of one or more interconnected roads arranged in a network. Road information can refer to inherent road information. Road information may include, but is not limited to, road attributes (national highway, provincial highway, etc.), number of lanes (3 lanes, 5 lanes, etc.), road direction (east-west, north-south, etc.), and road name. Road information may also include whether it is located in an elevated highway area.

[0047] The current road can refer to the road where the mobile terminal is currently located. When the mobile terminal's current location is in an elevated area, the current road can be a road on the elevated bridge or a main road under the elevated bridge.

[0048] like Figure 1 The mobile terminal can receive satellite signals transmitted by at least one satellite, and each satellite signal contains satellite-related information. This satellite-related information may include: satellite location information, satellite signal information, and satellite attribute information.

[0049] Satellite attribute information includes whether the satellite is used for location calculation. Whether a satellite is used for location calculation can be determined by whether the information provided by the satellite is used to determine the location of the mobile terminal. Whether a satellite is used for location calculation can be determined in several ways. For example, if the signal strength received by the mobile terminal from a satellite is below a threshold, that satellite will not be used for location calculation.

[0050] The satellite's position information may include the azimuth and / or elevation angles of the satellite relative to the mobile terminal.

[0051] Satellite signal information can include the signal-to-noise ratio (SNR) and / or signal strength of the satellite signal received by the mobile terminal. The satellite SNR refers to the ratio of signal to noise in the satellite signal received by the mobile terminal. The satellite signal strength refers to the intensity of the satellite signal received by the mobile terminal. The SNR and signal strength of the satellite signal received by the mobile terminal are affected by multiple factors, including distance and obstructions. For example, when the satellite signal transmitted to the mobile terminal passes through an obstruction (such as an overpass), the satellite signal strength is low, the signal received by the mobile terminal contains more noise, and the satellite SNR is low; when the satellite signal transmitted to the mobile terminal does not pass through an obstruction, the satellite signal strength is high, the signal received by the mobile terminal contains less noise, and the satellite SNR is high.

[0052] In some embodiments, the satellite signals (e.g., signal-to-noise ratio or signal strength) received by the mobile terminal from different satellites may differ.

[0053] In some embodiments, the signal received by the mobile terminal from the same satellite may change while the vehicle is in motion; in other words, the signal received by the mobile terminal from the same satellite may differ at different locations. For example, as the mobile terminal moves, if the distance between the mobile terminal and a satellite changes from unobstructed to obstructed, the signal strength or signal-to-noise ratio received by the mobile terminal from that satellite may decrease. Furthermore, the source of the signal received by the mobile terminal may change while the vehicle is in motion; that is, the signal received by the mobile terminal at different locations may originate from different satellites.

[0054] In some embodiments, the determining module can determine the roadside of a satellite relative to the current road based on the satellite's position information received by the mobile terminal. When a satellite is on side A of the current road, it can be considered that the satellite is located on side A of the current road. For example, the determining module can determine the roadside of the satellite relative to the current road based on the satellite's azimuth angle. For more details on determining the satellite's position relative to the current road, see [link to relevant documentation]. Figure 8 And its related descriptions.

[0055] In some embodiments, after determining the position of the satellite received by the mobile terminal relative to the current road, the determining module can determine the satellite signal pattern on both sides of the current road based on the satellite signals of the respective satellites on both sides of the current road.

[0056] Satellite signal patterns refer to the patterns of signals received by a mobile terminal from satellites. The current road includes both sides, and the satellite signal patterns for at least one side of the current road include: the satellite signal patterns on either side of the current road, and the satellite signal patterns between the two sides of the current road. The satellite signal patterns on any side are determined based on the satellite signals from at least one satellite located on that side. The signal patterns between the two sides are determined based on the relationship between the satellite signals from at least one satellite on each side.

[0057] In some embodiments, satellite signal patterns can be determined based on satellite signal-to-noise ratio and / or satellite signal strength. Satellite signal patterns can also be determined by other factors, such as the wavelength of the satellite signal.

[0058] In some embodiments, the satellite signal characteristics between the two sides of the current road can include the differences between the satellite signals on both sides of the current road. For example, it can include the differences in satellite signal-to-noise ratio (SNR) and / or satellite signal strength between the two sides of the current road. This difference can be an absolute difference (i.e., the absolute value of the difference), a ratio, etc. The difference can be the difference between the average SNR or average signal strength on each side of the road, or the difference between the SNR (or satellite signal strength) of a predetermined number (e.g., one) of satellites on each side of the road. The average SNR or signal strength on one side of the road can be the average of the SNR or the average of the signal strength of the satellites on that side.

[0059] For a more detailed description of the differences between satellite signals on both sides of the current road, see [link to relevant documentation]. Figure 3 The details and related descriptions will not be repeated here.

[0060] In some embodiments, the satellite signal patterns on any side of the current road can include the changes in satellite signal intensity on that side as the vehicle carrying the mobile terminal moves. For example, the changes in satellite signal intensity on that side can be the changes in the signal-to-noise ratio (SNR) or signal strength received by the mobile terminal from satellites on that side at different locations on the current road during the mobile terminal's movement. For example, the trends could be relatively constant, changing from strong to weak and then stabilizing, or changing from weak to strong and then stabilizing. The changes can be measured by the changes in average SNR or average signal strength, or by the SNR or signal strength of a predetermined number of satellites.

[0061] For more information on the changes in satellite signals on at least one side of the road while the vehicle is in motion, please refer to [link to relevant documentation]. Figure 4A and Figure 4B The details and related descriptions will not be repeated here.

[0062] Step 220: Based on the satellite signal patterns on at least one side of the current road, determine the judgment result for the current location. In some embodiments, step 220 can be performed by the judgment module.

[0063] The determination result can refer to the result of determining the current location within the elevated bridge area. In some embodiments, the determination result may include whether the current location is under the elevated bridge or on the elevated bridge.

[0064] In some embodiments, the judgment module can analyze the satellite signal patterns on at least one side of the current road to determine whether there is an obstruction between the mobile terminal and the satellite receiving the signal, thereby determining the judgment result. For example, when there is an obstruction between the mobile terminal and the satellite receiving the signal from an overpass, the current location is under the overpass; when there is no obstruction between the mobile terminal and the satellite receiving the signal from an overpass, the current location is on the overpass.

[0065] For more information on determining the judgment result based on the satellite signal patterns on at least one side of the current road, please refer to [link to relevant documentation]. Figure 3 , Figure 4A and Figure 4B .

[0066] In some embodiments, the judgment module may combine the satellite signal patterns on at least one side of the current road and the slope information of the current road to determine the judgment result. For more information on determining the judgment result based on the satellite signal patterns on at least one side of the current road and the slope information of the current road, please refer to... Figure 7 .

[0067] It should be understood that since the mobile terminal is placed inside the vehicle, the current location of the mobile terminal can be determined as the current location of the vehicle. Therefore, when the current location of the mobile terminal is below the elevated road, the current location of the vehicle containing the mobile terminal is also below the elevated road; when the current location of the mobile terminal is on the elevated road, the current location of the vehicle containing the mobile terminal is also on the elevated road.

[0068] In some embodiments of this specification, by analyzing the satellite signal patterns on at least one side of the current road, it can be determined whether the current location is under or on an overpass. Depending on the user's current location, the mobile terminal can provide more accurate navigation services corresponding to the road, avoiding navigation errors (e.g., if the user is under an overpass, the mobile terminal provides navigation services for the overpass), thereby improving the user's navigation experience. Furthermore, some embodiments of this specification can determine satellite signal patterns based on positioning-related information (satellite signal-to-noise ratio and / or satellite signal strength) while locating the mobile terminal. This is more convenient and avoids re-acquiring other information to determine satellite signal patterns, thus saving the mobile terminal's computing power and memory.

[0069] In some embodiments, the judgment module can also verify the judgment result to determine whether it is valid.

[0070] In some embodiments, the judgment module can determine whether there is a target road in the elevated bridge area that matches the association information of the current road, based on the road information of the elevated bridge area. The association information of the current road includes whether the current road is located on or under the elevated bridge, as determined based on the judgment result, and the travel direction of the vehicle carrying the mobile terminal on the current road. If a target road exists, the judgment result is valid. If it does not exist, the judgment result is invalid.

[0071] In some embodiments, when the judgment result is invalid, the judgment result can be discarded and data can be reacquired for judgment, or a reminder message can be sent to the user to ask for feedback.

[0072] The target road can refer to a road in the elevated bridge area that matches the current road. In some embodiments, the determination module can compare the association information of the current road with the road information of each road in the elevated bridge area to determine whether a target road exists. For example, if the association information of the current road includes that it is under an elevated bridge and the direction of travel is from west to east, and the road information of Zhujiang Road in the elevated bridge area is also that it is under an elevated bridge and the direction of travel is from west to east, then it can be determined that a target road matching the association information of the current road exists in the elevated bridge area.

[0073] In some embodiments, the determination module may first determine whether a road exists on or below the overpass in the direction of travel, based on the vehicle's travel direction, before making a judgment based on the satellite signal patterns of at least one side of the current road. If it does exist, subsequent judgments based on satellite signal patterns are performed. If it does not exist, operations such as sending a reminder message to the user may be performed.

[0074] In some embodiments of this specification, the validity of the judgment result is judged to avoid misjudgment caused by the influence of other obstructions (such as tall buildings on one side of the current road) on the satellite signal pattern, and to further ensure the accuracy of the judgment result.

[0075] Figure 3 This is an exemplary flowchart illustrating the determination of a judgment result according to some embodiments of this specification. In some embodiments, process 300 can be executed by a mobile terminal. Figure 3 As shown, process 300 may include the following steps:

[0076] Step 310: Based on the current location being in an elevated bridge area, determine the difference between satellite signals on both sides of the current road. In some embodiments, step 310 can be performed by a determination module.

[0077] like Figure 2 The satellite signal pattern on at least one side of the current road can include the difference between satellite signals on both sides of the current road. For example, the difference in average satellite signal-to-noise ratio (SNR) and / or average satellite signal strength between the two sides of the current road. In some embodiments, the mobile terminal can acquire satellite signals from one or more satellites, and the determining module can determine that these satellites are located on the roadside of the current road. The judging module can determine the difference (e.g., absolute difference) between the satellite signals on both sides of the current road based on the average satellite SNR and / or average satellite signal strength of the satellites on each side. For example, based on satellite signals from multiple satellites, it can be determined that the average satellite SNR on side A of the current road is 60 dB, the average satellite SNR on side B of the current road is 80 dB, and the absolute difference between the satellite SNR on both sides of the current road is 20 dB.

[0078] Step 320: Determine whether the difference between the satellite signals on both sides of the current road meets a first preset condition. In some embodiments, step 320 may be performed by a determination module.

[0079] The first preset condition relates to the relationship between satellite signals. In some embodiments, the first preset condition may be the relationship between satellite signals on both sides of a road. For example, the first preset condition may be the minimum absolute difference between the average satellite signal-to-noise ratio (SNR) or average satellite signal strength on both sides of the road. The first preset condition may also be other conditions. For example, the first preset condition may be the minimum ratio of the average satellite SNR or average satellite signal strength on the first side to the second side of the road, where the average SNR or average satellite signal strength on the first side is greater than that on the second side. The minimum absolute difference or minimum ratio can be preset according to actual needs. For example, the minimum absolute difference may be 10 dB.

[0080] In some embodiments, satisfying the first preset condition can be greater than the minimum absolute difference or the minimum ratio.

[0081] Step 330: In response to the difference satisfying a first preset condition, determine that the current location is under the overpass. In some embodiments, step 330 may be performed by a determination module.

[0082] In some embodiments, when the difference between satellite signals on both sides of the current road meets a first preset condition, it can be determined that there is an overpass blocking the satellite received by the mobile terminal on one side of the current road, thereby determining that the current location is under the overpass.

[0083] In some embodiments, if the difference between satellite signals on both sides of the current road does not meet a first preset condition, it can be determined that the current location is under an overpass, or the current location can be determined based on other methods. For example, the determination module can further determine the location based on the changing pattern of satellite signals on one side of the current road as the mobile terminal moves.

[0084] In some embodiments, as the vehicle moves and the mobile terminal moves, the determination module's assessment of whether the difference between the satellite signals on both sides of the current road meets the first preset condition can be a continuous process, and multiple assessments can be made to determine whether the difference between the satellite signals on both sides of the current road meets the first preset condition. In some embodiments, if the number of times the difference between the satellite signals on both sides of the current road meets the first preset condition is greater than a threshold number, the determination module can determine that the current location is under the overpass; if the number of times the difference between the satellite signals on both sides of the current road meets the first preset condition is less than a preset threshold number, the determination module can determine that the current location is on the overpass.

[0085] like Figure 4A As shown, when vehicle 130-2 is located on road 120-2 under the overpass, the mobile terminal receives satellite signals from satellites 140-1, 140-2, 140-3, and 140-4. Satellites 140-1 and 140-2 are located on the left side of the road, in the direction of vehicle travel. The satellite signals 410-1 and 410-2 received by the mobile terminal from these satellites are blocked by the overpass, resulting in a low signal-to-noise ratio (SNR) for these signals. Satellites 140-3 and 140-4 are located on the right side of the road, in the direction of vehicle travel. The satellite signals 410-3 and 410-4 are not blocked, therefore the SNR for these signals received by the mobile terminal is high. Therefore, the difference in satellite signal-to-noise ratio between the two sides of road 120-1 received by the mobile terminal in vehicle 130-2 is large (e.g., the absolute difference is greater than the threshold).

[0086] like Figure 4B As shown, when vehicle 130-1 is located on road 120-1 of the overpass, the satellite signals 420-1, 420-2, 420-3, and 420-4 emitted by satellites 140-1, 140-2, 140-3, and 140-4 located on both sides of road 120-1 are not blocked. Therefore, the difference in satellite signal-to-noise ratio between the two sides of road 120-1 received by the mobile terminal in vehicle 130-1 is small (e.g., the absolute difference is less than the threshold).

[0087] Figure 5This is yet another exemplary flowchart illustrating the determination of a judgment result according to some embodiments of this specification. In some embodiments, process 500 can be executed by a mobile terminal. Figure 5 As shown, process 500 may include the following steps:

[0088] Step 510: Based on the current location being in an elevated bridge area, determine the satellite signal change pattern on at least one side of the current road during the movement of the vehicle containing the mobile terminal. In some embodiments, step 510 can be performed by a determination module.

[0089] like Figure 2 The satellite signal pattern on at least one side of the current road can include the change pattern of satellite signals on at least one side of the current road during the movement of the vehicle containing the mobile terminal. This change pattern can include the change pattern of satellite signal-to-noise ratio and / or satellite signal strength on at least one side of the current road during the movement of the vehicle containing the mobile terminal. In some embodiments, during movement, the mobile terminal can continuously acquire satellite signals from one or more satellites, and the determination module can continuously determine the road side of the current road where these satellites are located. For a particular side, the determination module can determine the change pattern of the average satellite signal-to-noise ratio and / or average satellite signal strength of the satellites on that side.

[0090] In some cases, one side of the road under an overpass may be obstructed by the overpass. As a vehicle moves from a non-overpass area onto the road under an overpass, the satellite signal-to-noise ratio (SNR) and / or satellite signal strength received by the mobile terminal from the overpass side of the road (the side of the road obstructed by the overpass) will change systematically. Before entering the overpass area, because there is no overpass obstruction between the road and the satellite, the satellite SNR or satellite signal strength is relatively high. As the vehicle enters the road under the overpass, due to the obstruction between the road and the satellite, the satellite SNR and satellite signal strength on the overpass side of the road gradually decrease and tend to stabilize.

[0091] Step 520: Determine whether the satellite signal change pattern on at least one side of the current road meets the second preset condition during the movement of the vehicle where the mobile terminal is located. In some embodiments, step 520 can be performed by the determination module.

[0092] The second preset condition may be related to the changes in satellite signals on one side of the road during vehicle movement or travel. In some embodiments, the second preset condition may be the pattern of satellite signal changes on the elevated side when the vehicle is traveling on the road under the elevated bridge. For example, the second preset condition may include the pattern of changes in the satellite signal-to-noise ratio and / or satellite signal strength on the elevated side when the vehicle is traveling on the road under the elevated bridge. In some embodiments, the second preset condition may be preset. The second preset condition may be that the satellite signal-to-noise ratio or satellite signal strength on one side of the road decreases from high to low, or decreases from high to low and tends to stabilize. The preset condition may also set the magnitude of the change. For example, the second preset condition may be preset to the satellite signal-to-noise ratio on the current road side gradually decreases and then tends to stabilize within a preset time period, with the stabilized satellite signal-to-noise ratio being 10% lower than the satellite signal-to-noise ratio when it began to decrease.

[0093] Step 530: In response to the satellite signal change pattern on at least one side of the current road satisfying the second preset condition, it is determined that the current location is under the overpass. In some embodiments, step 530 can be performed by a determination module.

[0094] In some embodiments, when the satellite signal change pattern on at least one side of the current road meets the second preset condition, the determination module can determine that one side of the current road is blocked by the overpass, and further determine that the current location is under the overpass.

[0095] In some embodiments, when the satellite signal variation pattern does not meet the second preset condition, the current location can be determined based on other satellite signal patterns (e.g., the difference between satellite signals on both sides of the current road). In some embodiments, when the satellite signal variation pattern does not meet the second preset condition, it can also be determined that the current location is on an overpass.

[0096] like Figure 6AAs shown, when a vehicle is traveling on road 120-2 under the overpass, satellite 140-1 is positioned on the overpass side of road 120-2 (i.e., to the left of road 120-2 with the vehicle's direction of travel as the positive direction). As the vehicle moves from position 130-2a to 130-2b and then to 130-2c, the satellite signals 610-1, 610-2, and 610-3 received by the vehicle from satellite 140-1 are gradually blocked, resulting in a gradual increase in noise and a gradual decrease in signal strength in the satellite signals 610-1, 610-2, and 610-3 received by the mobile terminal. It is understandable that signals from other satellites (not shown) on the overpass side received by the mobile terminal may also exhibit similar changes. During the vehicle's movement, the average satellite signal-to-noise ratio or average satellite signal strength received by the mobile terminal on the overpass side at each position reached by the vehicle is calculated. During vehicle movement, the average satellite signal-to-noise ratio or average satellite signal strength on the viaduct side changes from large to small and then tends to stabilize.

[0097] like Figure 6B As shown, when a vehicle is traveling on road 120-1 of the overpass, satellite 140-1 is positioned to the left of road 120-1 with the vehicle's direction of travel as the positive direction. When the vehicle moves from position 130-1a to 130-1b and then to 130-1c, the satellite signals 620-1, 620-2, and 620-3 received by the vehicle from satellite 140-1 are not obstructed. Therefore, the differences in noise and signal strength among the satellite signals 620-1, 620-2, and 620-3 received by the mobile terminal will not be significant. During the vehicle's movement, the variation pattern of the average satellite signal-to-noise ratio or average satellite signal strength on either side of road 120-1 remains essentially unchanged.

[0098] In some embodiments, the judgment module can determine the judgment result by taking any satellite signal pattern. For example, if any satellite signal pattern determines that the current location is under an overpass, then the current location is under an overpass. In some embodiments, the judgment module can combine judgment results determined based on different satellite signal patterns to determine the final judgment result. For example, when just entering the overpass area (e.g., when the distance between the current location and a preset point on the overpass is less than a distance threshold), the judgment result is determined based on the difference in satellite signals on both sides of the road. After entering the overpass area for a certain period of time or after traveling a certain distance, the judgment result is determined based on the satellite signal change pattern on at least one side of the road. Another example is that the judgment results determined by different patterns are weighted and summed to determine the final judgment result. The weights can be the confidence levels of different judgment results.

[0099] Figure 7 This is another exemplary flowchart illustrating the determination of a judgment result according to some embodiments of this specification. In some embodiments, process 700 can be executed by a mobile terminal. Figure 7 As shown, process 700 may include the following steps:

[0100] Step 710: Based on the current location being in an elevated bridge area, determine the satellite signal pattern on at least one side of the current road. In some embodiments, step 710 may be performed by a determination module.

[0101] Step 710 is the same as step 310, therefore, for more information about step 710, please refer to [link / reference needed]. Figure 3 The details and related descriptions will not be repeated here.

[0102] Step 720: Based on satellite signal patterns and the current road slope information, determine the judgment result of the current location. In some embodiments, step 720 can be performed by the judgment module.

[0103] Slope information refers to the current road gradient. In some embodiments, slope information may include uphill, downhill, flat, etc. In some embodiments, slope information may also include a specific numerical value for the slope. For example, the specific numerical value of the slope is the percentage of the elevation difference between two points relative to their distance, calculated using the formula: Slope = (Elevation difference / Distance) x 100%.

[0104] The current road slope information can be obtained in several ways. For example, it can be obtained via GPS. For instance, GPS can be used to determine the height difference and horizontal displacement distance of a mobile terminal at different points in time, thereby determining the current road slope information.

[0105] In some embodiments, the determination module can analyze satellite signal patterns and the current road slope information to determine the current location. For example, if the satellite signal-to-noise ratio on one side of the current road remains unchanged and the current road slope is uphill while the vehicle is moving, the current location is determined to be on an overpass. The determination of the current location based on satellite signal patterns and the current road slope information can also be achieved using the methods described in steps 721 and 722 below.

[0106] Step 721: Determine the relationship between the current road slope information and the entrances and exits of the viaduct area.

[0107] An elevated bridge area may include elevated bridge exits and / or entrances. In some embodiments, entrance and exit information for the elevated bridge area may be obtained based on road network information. When an elevated bridge area includes an elevated bridge exit, the road leading to the exit is located on the elevated bridge and is a downhill road. When an elevated bridge area includes an elevated bridge entrance, the road leading to the entrance is located on the elevated bridge and is an uphill road.

[0108] In some embodiments, the relationship between the current road's slope information and the entrance / exit of the viaduct can be determined, and the relationship can include correspondence or non-correspondence. When the relationship between the current road's slope information and the entrance / exit of the viaduct area is corresponding, it indicates that the current road's slope information is downhill and it is the road at the exit of the viaduct area, or the current road's slope information is uphill and it is the road at the entrance of the viaduct area.

[0109] Step 722: Based on the relationship between the current road slope information and the entrances and exits of the elevated bridge area, and the satellite signal patterns, determine the judgment result of the current location.

[0110] In some embodiments, the location of the current position on or under the viaduct can be determined based on the relationship between the current road's slope information and the viaduct's entrances and exits. For example, if the relationship corresponds, the current position is on the viaduct. Conversely, if the relationship does not correspond, the current position is under the viaduct.

[0111] In some embodiments, when the slope information of the current road does not correspond to the entrance and exit of the overpass, a judgment can be made based on the satellite signal pattern to determine the current location. If the judgment result determines that the current location is under the overpass, then the judgment result is taken as the final judgment result.

[0112] In some embodiments, the judgment module can combine a judgment result determined based on the relationship between the current road slope information and the entrance / exit of the overpass (referred to as the "first sub-judgment result") and a judgment result determined based on satellite signal patterns (referred to as the "second sub-judgment result") to determine the final judgment result. For example, the judgment module can determine the first sub-judgment result and its first confidence level based on the absolute difference between satellite signals on both sides of the current road; determine the second sub-judgment result and its second confidence level based on the relationship; and determine the final judgment result based on the first sub-judgment result and its first confidence level, and the second sub-judgment result and its second confidence level. For example, the first sub-judgment result and the second sub-judgment result can be weighted and summed, with the weight being the confidence level.

[0113] The first confidence level can characterize the credibility of the first sub-judgment result. In some embodiments, the first confidence level can be determined based on the magnitude of the absolute difference or ratio between satellite signals on both sides of the current road. For example, the greater the difference between the absolute difference and the absolute difference threshold, the higher the confidence level.

[0114] The second confidence level can characterize the credibility of the second sub-judgment result. In some embodiments, the second confidence level can be determined based on the number of roads in the elevated bridge area where the current road is located, wherein the number of roads can be determined based on road network information. For example, when the number of roads is 1, the second confidence level can be 100%. As another example, when the number of roads is 2 to 3, the second confidence level can be 95%. The second confidence level can also be determined in other ways, for example, based on the credibility of slope information, traffic congestion, etc.

[0115] In some embodiments of this specification, the relationship between the current road slope information and the entrances and exits of the elevated bridge area is used, combined with satellite signal patterns, to determine whether a vehicle is traveling on the main road or the auxiliary road of the elevated bridge from multiple aspects, making the judgment more accurate and preventing misjudgment.

[0116] As previously mentioned, the mobile terminal can receive satellite-related information from one or more satellites. In some embodiments, the determining module can determine the position of each satellite relative to the road (i.e., the current road) where the vehicle is located, based on the positions of the received satellites.

[0117] In some embodiments, the determining module can determine which side of the current road the satellite is located on (i.e., the side of the road where the satellite is located) based on the satellite azimuth angle. For example, taking the direction of vehicle travel as due north, the direction of the line connecting the vehicle and the satellite as the satellite direction, and the angle between due north and the satellite direction clockwise as the azimuth angle. When the azimuth angle is between 0 and 180°, the side of the road where the satellite is located is to the right of the vehicle's direction of travel; when the azimuth angle is between 180° and 360°, the side of the road where the satellite is located is to the left of the vehicle's direction of travel.

[0118] In some embodiments, the determining module can filter satellites based on their attribute information, and further perform subsequent steps based on the filtered satellites, such as determining the satellite signal patterns on at least one side of the road in step 210. For example, satellites used for position calculation can be used to determine the satellite signal patterns on at least one side of the road.

[0119] In some embodiments, the determining module can filter satellites based on their elevation angles, and further perform subsequent steps based on the filtered satellites. For example, using the ground as a two-dimensional plane, the satellite elevation angle can be the angle between the line connecting the satellite's projection point on that two-dimensional plane and the vehicle, and the line connecting the satellite to the vehicle. In some embodiments, satellites with elevation angles less than a threshold angle can be used to determine the satellite signal patterns on at least one side of the road.

[0120] If an overpass exists, the smaller the satellite's elevation angle, the more easily the satellite signal received by a mobile terminal below the overpass will be blocked. Filtering satellite signals by their elevation angle can make the satellite signals received by the mobile terminal more reflective of patterns.

[0121] like Figure 8 As shown, Road 810 is the road beneath the viaduct, with the viaduct side to the left of the direction of vehicle travel. Quadrilaterals, circles, and pentagons represent satellites, and their positions represent the corresponding satellite's projected position on the ground. The signal strength or signal-to-noise ratio of the satellite represented by the quadrilateral is lower than that of the satellite represented by the circle, and vice versa.

[0122] Satellite 820-1 has an azimuth angle of less than 180° and is located on the right side of road 810, in the direction of vehicle travel. Satellite 830-1 has an azimuth angle of greater than 180° and is located on the left side of road 810, in the direction of vehicle travel.

[0123] Satellite 820-2 is located on the left side of the vehicle's direction of travel (i.e., the viaduct side) with a relatively large elevation angle. Satellite 820-2 has a relatively high satellite signal strength or signal-to-noise ratio (SNR). Satellite 840-1 is also located on the left side of the vehicle's direction of travel (i.e., the viaduct side) with a relatively small elevation angle. Satellite 820-1 is better able to reflect the pattern that the satellite signal strength or SNR decreases when the left side of the vehicle's direction of travel is blocked by the viaduct. Therefore, satellite 820-2 can be excluded.

[0124] The basic concepts have been described above. Obviously, for those skilled in the art, the detailed disclosure above is merely illustrative and does not constitute a limitation of this specification. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and corrections to this specification. Such modifications, improvements, and corrections are suggested in this specification and therefore remain within the spirit and scope of the exemplary embodiments described herein.

[0125] Furthermore, this specification uses specific terms to describe embodiments thereof. For example, "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic associated with at least one embodiment of this specification. Therefore, it should be emphasized and noted that references to "an embodiment," "one embodiment," or "an alternative embodiment" in different locations throughout this specification do not necessarily refer to the same embodiment. Moreover, certain features, structures, or characteristics in one or more embodiments of this specification can be appropriately combined.

[0126] Furthermore, unless expressly stated in the claims, the order of processing elements and sequences, the use of numbers and letters, or other names described in this specification are not intended to limit the order of the processes and methods described herein. Although various examples have been discussed in the foregoing disclosure of some embodiments of the invention that are currently considered useful, it should be understood that such details are for illustrative purposes only, and the appended claims are not limited to the disclosed embodiments; rather, the claims are intended to cover all modifications and equivalent combinations that conform to the spirit and scope of the embodiments described herein. For example, while the system components described above can be implemented using hardware devices, they can also be implemented solely using software solutions, such as installing the described system on existing servers or mobile devices.

[0127] Similarly, it should be noted that, in order to simplify the description disclosed herein and thus aid in the understanding of one or more embodiments of the invention, the foregoing description of embodiments in this specification may sometimes combine multiple features into a single embodiment, drawing, or description thereof. However, this method of disclosure does not imply that the subject matter of this specification requires more features than those mentioned in the claims. In fact, the embodiments contain fewer features than all the features of a single embodiment disclosed above.

[0128] In some embodiments, numbers describing the quantity of components and attributes are used. It should be understood that such numbers used in the description of embodiments are modified in some examples with the terms "approximately," "approximately," or "generally." Unless otherwise stated, "approximately," "approximately," or "generally" indicates that the numbers are allowed to vary by ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, which may be changed depending on the characteristics required by individual embodiments. In some embodiments, numerical parameters should take into account specified significant digits and employ a general method of digit reservation. Although the numerical ranges and parameters used to confirm their breadth of range in some embodiments of this specification are approximate values, in specific embodiments, such values ​​are set as precisely as feasible.

[0129] For each patent, patent application, patent application publication, and other material, such as articles, books, specifications, publications, and documents, referenced in this specification, the entire contents of which are incorporated herein by reference. This excludes historical application documents that are inconsistent with or conflict with the content of this specification, as well as documents that limit the broadest scope of the claims in this specification (currently or subsequently appended to this specification). It should be noted that in the event of any inconsistency or conflict between the descriptions, definitions, and / or terminology used in the supplementary materials to this specification and the content of this specification, the descriptions, definitions, and / or terminology used in this specification shall prevail.

[0130] Finally, it should be understood that the embodiments described in this specification are merely illustrative of the principles of the embodiments described herein. Other variations may also fall within the scope of this specification. Therefore, alternative configurations of the embodiments described herein are intended to be illustrative rather than limiting, and should be considered consistent with the teachings of this specification. Accordingly, the embodiments described herein are not limited to those explicitly introduced and described herein.

Claims

1. A method for determining the location of a mobile terminal in an elevated bridge area, characterized in that, The method is executed by the mobile terminal and includes: The system receives satellite signals, which include satellite position information, satellite signal information, and satellite attribute information. The satellite position information includes the azimuth and / or elevation angle of the satellite relative to the mobile terminal, and the satellite signal information includes the signal strength of the satellite signal received by the mobile terminal. Satellites are filtered based on their location information, signal information, and attribute information, and satellites with signal strength below a threshold and elevation angle less than a threshold angle are selected as the solution satellites. Based on the fact that the current location is in the elevated bridge area, the satellite signal pattern of at least one side of the current road is determined from the satellite signals corresponding to the solution satellite; Based on the satellite signal patterns on at least one side of the current road, a judgment result is determined for the current location, the judgment result including whether the current location is under or on the viaduct; The determination of the current location based on the satellite signal patterns on at least one side of the current road includes: Based on the absolute difference between the satellite signals on both sides of the current road, a first sub-judgment result and a corresponding first confidence level are determined. The first confidence level is determined based on the absolute difference or ratio between the satellite signals on the current road, and the greater the difference, the higher the confidence level. Based on the relationship between the current road's slope information and the entrances and exits of the elevated bridge area, the second sub-judgment result and the corresponding second confidence level of the current location are determined. The second confidence level is determined based on the number of roads in the elevated bridge area where the current road is located. The first and second sub-judgment results are weighted and summed using their corresponding confidence levels to determine the final judgment.

2. The method according to claim 1, characterized in that, The satellite signal patterns on at least one side of the current road include: The difference between the satellite signals on both sides of the current road; Based on the satellite signal patterns on at least one side of the current road, a judgment result for the current location is determined, including: Determine whether the difference between the satellite signals on both sides of the current road meets the first preset condition; In response to the difference satisfying the first preset condition, it is determined that the current location is under the overpass.

3. The method according to claim 1, characterized in that, The satellite signal patterns on at least one side of the current road include: The pattern of satellite signal changes on at least one side of the current road during the movement of the vehicle where the mobile terminal is located; Based on the satellite signal patterns on at least one side of the current road, a judgment result for the current location is determined, including: Determine whether the satellite signal change pattern on at least one side of the current road meets the second preset condition during the movement of the vehicle where the mobile terminal is located; In response to the satellite signal change pattern on at least one side of the current road satisfying the second preset condition, it is determined that the current location is under the overpass.

4. The method according to claim 2 or 3, characterized in that, The satellite signal patterns are determined based on the satellite signal-to-noise ratio and / or satellite signal strength.

5. The method according to claim 1, characterized in that, Also includes: Based on the road information of the elevated bridge area, determine whether there is a target road in the elevated bridge area that matches the association information of the current road. The association information of the current road includes, based on the determination result, whether the current road is located on or under the elevated bridge and the driving direction of the vehicle where the mobile terminal is located on the current road. If the target road exists, the judgment result is deemed valid.

6. A system for determining the location of a mobile terminal in an elevated bridge area, disposed on the mobile terminal, characterized in that, The mobile terminal receives satellite signals, which include satellite position information, satellite signal information, and satellite attribute information. The satellite position information includes the azimuth and / or elevation angle of the satellite relative to the mobile terminal, and the satellite signal information includes the signal strength of the satellite signal received by the mobile terminal. The system includes: The determination module is used for: Satellites are filtered based on their location information, signal information, and attribute information, and satellites with signal strength below a threshold and elevation angle less than a threshold angle are selected as the solution satellites. Based on the fact that the current location is in an elevated area, determine the satellite signal pattern on at least one side of the current road; The judgment module determines a judgment result for the current location based on the satellite signal patterns on at least one side of the current road. The judgment result includes whether the current location is under or on the overpass. The determination of the current location based on the satellite signal patterns on at least one side of the current road includes: Based on the absolute difference between the satellite signals on both sides of the current road, a first sub-judgment result and a corresponding first confidence level are determined. The first confidence level is determined based on the absolute difference or ratio between the satellite signals on the current road, and the greater the difference, the higher the confidence level. Based on the relationship between the current road's slope information and the entrances and exits of the elevated bridge area, the second sub-judgment result and the corresponding second confidence level of the current location are determined. The second confidence level is determined based on the number of roads in the elevated bridge area where the current road is located. The first and second sub-judgment results are weighted and summed using their corresponding confidence levels to determine the final judgment.

7. A device for determining the location of a mobile terminal in an elevated bridge area, characterized in that, The device includes at least one processor and at least one memory; The at least one memory is used to store computer instructions; The at least one processor is configured to execute at least a portion of the computer instructions to implement the method as described in any one of claims 1 to 5.

8. A computer-readable storage medium, characterized in that, The storage medium stores computer instructions that, when executed by a processor, implement the method as described in any one of claims 1 to 5.

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