CN112147570A - Positioning method and system - Google Patents
Positioning method and system Download PDFInfo
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- CN112147570A CN112147570A CN201910567711.XA CN201910567711A CN112147570A CN 112147570 A CN112147570 A CN 112147570A CN 201910567711 A CN201910567711 A CN 201910567711A CN 112147570 A CN112147570 A CN 112147570A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S1/00—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
- G01S1/72—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using ultrasonic, sonic or infrasonic waves
- G01S1/76—Systems for determining direction or position line
- G01S1/78—Systems for determining direction or position line using amplitude comparison of signals transmitted from transducers or transducer systems having differently-oriented characteristics
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
- G01S5/18—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using ultrasonic, sonic, or infrasonic waves
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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
- H04W4/02—Services making use of location information
- H04W4/021—Services related to particular areas, e.g. point of interest [POI] services, venue services or geofences
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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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
- H04W64/006—Locating users or terminals or network equipment for network management purposes, e.g. mobility management with additional information processing, e.g. for direction or speed determination
Abstract
The application provides a positioning method and a positioning system, which are used for determining the position of an acquisition end of a sound pressure signal by using the discrete degree parameter of the sound pressure signal.
Description
Technical Field
The present application relates to the field of electronic information, and in particular, to a positioning method and system.
Background
In recent years, Passive Entry Passive Start (PEPS) systems have been widely used in automobiles. The basic technical logic of PEPS is: the method comprises the steps that a terminal (a car key or a mobile phone) transmits a wireless signal, a wireless receiver is arranged on a vehicle, the wireless signal transmitted by the terminal (the car key or the mobile phone) is received, a processing end judges the area where the terminal is located according to the parameters (such as the strength of the signal) of the received signal, as shown in fig. 1, when the terminal is judged to be located in a PE area, passive entering PE logic is executed, and when the terminal is judged to be located in a PS area, the passive starting PS logic is executed.
Currently, in the positioning method based on wireless signals, there is a certain error, for example, the terminal located inside the vehicle is determined to be outside the vehicle, thereby causing an error in the execution logic of the PEPS (for example, the terminal is located outside the vehicle, but the unlocking logic is not executed and the start logic is executed).
Disclosure of Invention
The application provides a positioning method and a positioning system, and aims to solve the problem of execution logic errors of a PEPS (Passive entry Passive Start) caused by inaccurate positioning.
In order to achieve the above object, the present application provides the following technical solutions:
a method of positioning, comprising:
collecting a sound pressure signal;
and determining the position of the acquisition end of the sound pressure signal according to the dispersion degree parameter of the sound pressure signal.
Optionally, the acquiring the sound pressure signal includes:
and acquiring the sound pressure signal under the condition that the parameter of the preset signal received by the receiving end is in a preset range, wherein the preset signal is sent out by the acquisition end, the upper limit value of the preset range is not more than the threshold value for executing the passive start of the PS logic, and the lower limit value is not less than the lower limit value for executing the passive entry of the PE logic.
Optionally, the discrete degree parameter includes:
variance or standard deviation.
Optionally, the determining the position of the acquisition end of the sound pressure signal according to the dispersion degree parameter includes:
determining that the acquisition end is positioned in the vehicle under the condition that the discrete degree parameter is greater than a preset threshold value;
and under the condition that the discrete degree parameter is not greater than the preset threshold value, determining that the acquisition end is positioned outside the vehicle.
Optionally, the method for determining the preset threshold includes:
aiming at any scene, acquiring a sound pressure signal inside a vehicle and a sound pressure signal outside the vehicle in the scene;
calculating a dispersion degree parameter of a sound pressure signal in the vehicle according to the sound pressure signal in the vehicle, and calculating a dispersion degree parameter of the sound pressure signal outside the vehicle according to the sound pressure signal outside the vehicle;
and determining a third preset threshold value as a threshold value corresponding to the scene according to the dispersion degree parameter of the sound pressure signal inside the vehicle and the dispersion degree parameter of the sound pressure signal outside the vehicle.
Optionally, before the determining the position of the acquisition end of the sound pressure signal according to the parameter of the degree of dispersion, the method further includes:
determining a scene where the acquisition end is located;
and acquiring a threshold corresponding to the scene where the acquisition end is located.
A positioning system, comprising:
the collector is used for collecting sound pressure signals;
and the processor is used for determining the position of the collector according to the discrete degree parameter of the sound pressure signal.
Optionally, the processor is further configured to:
and under the condition that the parameter of a preset signal received by a receiving end is in a preset range, triggering the collector to collect the sound pressure signal, wherein the preset signal is sent out by the collector, the upper limit value of the preset range is not more than the threshold value for executing the passive start of the PS logic, and the lower limit value is not less than the lower limit value for executing the passive entry of the PE logic.
Optionally, the processor is arranged in an in-vehicle processing module of a preset PEPS system, and the collector is arranged at a preset terminal.
Optionally, the processor is further configured to:
sending a starting instruction to the collector under the condition that the parameter of the signal received by the in-vehicle module is in a range corresponding to a preset PE execution logic;
the collector is specifically configured to collect a sound pressure signal when the opening instruction is received.
Optionally, the discrete degree parameter includes:
variance or standard deviation.
The processor is specifically configured to determine that the collector is located in the vehicle when the discrete degree parameter is greater than a preset threshold; and determining that the collector is positioned outside the vehicle under the condition that the discrete degree parameter is not greater than the preset threshold value.
Optionally, the processor is further configured to:
aiming at any scene, acquiring a sound pressure signal inside a vehicle and a sound pressure signal outside the vehicle in the scene; calculating a dispersion degree parameter of a sound pressure signal in the vehicle according to the sound pressure signal in the vehicle, and calculating a dispersion degree parameter of the sound pressure signal outside the vehicle according to the sound pressure signal outside the vehicle; and determining a third preset threshold value as a threshold value corresponding to the scene according to the dispersion degree parameter of the sound pressure signal inside the vehicle and the dispersion degree parameter of the sound pressure signal outside the vehicle.
Optionally, the processor is further configured to:
before the position of the collector is determined according to the discrete degree parameter, determining the scene where the collector is located; and acquiring a threshold corresponding to the scene where the collector is located.
The positioning method and the positioning system determine the position of the acquisition end of the sound pressure signal by using the discrete degree parameter of the sound pressure signal, and have higher accuracy compared with the existing parameter positioning method according to the signal.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1(a) is an exemplary diagram of a PE region and a PS region in the related art;
fig. 1(b) is an exemplary diagram of a PE region, a critical section, and a PS region disclosed in an embodiment of the present application;
FIG. 2 is an exemplary diagram of a prior art PEPS system;
fig. 3 is a flowchart of a positioning method disclosed in an embodiment of the present application;
fig. 4 is a schematic structural diagram of a positioning system disclosed in an embodiment of the present application;
fig. 5 is a flowchart of another positioning method disclosed in the embodiment of the present application.
Detailed Description
The positioning method, the positioning system and the positioning terminal disclosed by the embodiment of the application can be applied to a PEPS system, and a more accurate positioning function is realized. As shown in fig. 2, one example of the existing PEPS system includes a terminal for transmitting wireless signals and an in-vehicle processing module. The in-vehicle processing module comprises an in-vehicle receiver used for receiving wireless signals and an in-vehicle processor used for determining that the terminal is in the vehicle or outside the vehicle according to the parameters of the wireless signals received by the receiver and triggering PE or PS logic according to the position of the terminal.
Compared with the prior art, the positioning method in the following embodiments of the application adds a technical means of positioning based on acoustic characteristics to improve the accuracy of the positioning result.
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Fig. 3 is a positioning method disclosed in an embodiment of the present application, including the following steps:
s301: and collecting sound pressure signals.
The sound pressure refers to a pressure change amount caused by vibration when sound waves pass through a medium. Typically, the sound pressure signal is acquired using a sound collector, such as a microphone. In this embodiment, the collected sound pressure signal may be a sound pressure signal of environmental noise.
Specifically, at least one of the following may be used: the sound pressure signal is acquired at any one of a preset sampling rate such as 8000Hz-384000Hz, a preset number of sampling bits such as 4bits-32bits, a preset number of channels such as 1 or 2, and a preset sampling period such as 1-5000 milliseconds. For example, sound pressure signals within a range of 1000 milliseconds of a plurality of sampling time periods are collected at a sampling frequency of 8000Hz, wherein the collected sound signals are stored by using 4bits, and the number of channels used by the collecting device is 2.
S302: and determining the position of the acquisition end of the sound pressure signal according to the dispersion degree parameter of the sound pressure signal.
In this embodiment, the sound pressure signal acquisition end is the terminal shown in fig. 2.
The parameter of the degree of dispersion of the sound pressure signal may be a variance or a standard deviation of the sound pressure signal. Assuming that N sound pressure signals are acquired, the variance or standard deviation of the sound pressure values of the N sound pressure signals is a parameter of the degree of dispersion of the sound pressure signals.
Optionally, in the case of setting a sampling time period, a sound pressure signal with a maximum sound pressure value acquired in any one sampling time period is used as the sound signal of the sampling time period. The N sampling periods correspond to N sound pressure signals.
Because the difference between the sound pressure signals is small, alternatively, the formula can be used: and (4) calculating the decibel value of the sound pressure signal when dB is 20log (P/Po), and taking the decibel value as the sound pressure signal to improve the difference between the sound pressure signals and facilitate subsequent judgment. Wherein dB represents a decibel value, P represents a sound pressure value of the acquired sound pressure signal, and Po represents a lowest sound pressure amplitude of 20 millionths of pascals (20 μ Pa) which can be perceived by human ears.
Specifically, the acquisition end is determined to be located outside the vehicle under the condition that the discrete degree parameter is greater than the preset threshold value, and the acquisition end is determined to be located inside the vehicle under the condition that the discrete degree parameter is not greater than the preset threshold value.
As can be seen from the flow shown in fig. 1, unlike the positioning method of the prior art, the sound pressure signal is used for positioning, so that the following beneficial effects are achieved:
1. in the existing method for positioning by using signal strength, because the shielding effect of a shielding material for a wireless signal in a vehicle body is poor, a part of the wireless signal can leak outside the vehicle, and therefore positioning misjudgment is caused. In the embodiment, the sound pressure is used for positioning, so that the signal leakage problem does not exist, and the accuracy is higher than that of a positioning method using the signal intensity. In addition, because the receiver needs to receive a very weak wireless signal submerged in noise, the receiver needs high power and energy consumption is increased, sound pressure is used for positioning, only a sound pressure signal of the noise is acquired, and the energy consumption is greatly reduced.
2. The existing method for positioning by using signal flight time requires that a system has an accurate clock to record the time of transmission and reception, and positioning is performed by using sound pressure without clock synchronization, so that the requirement on the system is not high, and the method is easy to realize.
Corresponding to the method shown in fig. 3, an embodiment of the present application further discloses a positioning system, as shown in fig. 4, including a collector 41 and a processor 42, where the collector 41 is configured to collect a sound pressure signal, and the processor 42 is configured to determine a position of the collector 41 according to a dispersion degree parameter of the sound pressure signal.
In connection with the architecture of the existing PEPS system shown in fig. 2, the collector 41 is disposed at the terminal, and the processor 42 may be disposed at the terminal or in the vehicle (for example, may be disposed as an in-vehicle processor or another processor besides the in-vehicle processor). To improve the reliability of the positioning result, the processor 42 is preferably arranged in the vehicle.
The flow shown in fig. 3 will be described in detail below by taking the case where the collector 41 is disposed at a terminal and the processor 42 is disposed in a vehicle (i.e., as an in-vehicle processor), and combining with the existing PEPS technology.
Fig. 5 is a schematic diagram of another positioning method disclosed in the embodiment of the present application, including the following steps:
s501: the terminal transmits a wireless signal.
In this embodiment, a specific implementation manner of the terminal transmitting the wireless signal may refer to an existing PEPS technology, for example, the wireless signal is continuously transmitted or periodically transmitted, which is not limited herein.
S502: the in-vehicle processor triggers the terminal to acquire the sound pressure signal under the condition that the terminal is determined to be in the critical area according to the signal received by the in-vehicle receiver (namely the receiving end).
As shown in fig. 1(b), based on the division of the PE region and the PS region in fig. 1(a), in the present embodiment, a critical section is added between the PE region and the PS region. The critical area is an area with a high misjudgment rate, and the requirements on the critical area are as follows: including most or all areas within the vehicle and as little as possible of the area outside the vehicle.
Specifically, the critical section may be predetermined according to calibration of parameters of the wireless signal. For example, for a certain vehicle type, the parameters of the wireless signals received by the in-vehicle processor are collected in advance when the terminals are located inside and outside the vehicle, and the parameter range of the wireless signals corresponding to the critical zone is determined according to the parameter values of the signals received inside and outside the vehicle.
In this embodiment, after receiving the wireless signal sent by the terminal, it is determined whether the terminal is located in the critical area according to the parameter value of the wireless signal.
Further, the specific form of the parameters of the wireless signal can be found in the prior art, for example, the parameters of the wireless signal include but are not limited to: the strength of the wireless signal, the time of flight of the wireless signal, and the angle of arrival or angle of departure of the wireless signal.
Taking the parameters of the signal as the strength of the signal as an example: the terminal is located in the PS area, and the strength of the signal received by the receiving end is not less than R1. The terminal is located in the critical zone, the strength of the signal received by the receiving end is in (R2, R1), the terminal is located in the PE region, and the strength of the signal received by the receiving end is in [ R3, R2 ].
As can be seen from the above description, in practice, the divided different regions may be only virtual regions, and only different ranges of parameters define different virtual regions. Namely, under the condition that the parameter of the signal received by the receiving end of the in-vehicle processor is in the preset range, the acquisition of the sound pressure signal is triggered.
The preset range is a range corresponding to the critical zone, the upper limit value of the preset zone is not greater than the threshold value for executing the PS logic, and the lower limit value is not less than the lower limit value for executing the PE logic. Taking the parameters of the signal as the strength of the signal as an example: assuming that the signal strength corresponding to the PS region is greater than or equal to R1 in the prior art, the range of the signal strength corresponding to the PE region is: if the signal intensity is smaller than R1 and not smaller than R3, the upper limit of the range of the signal intensity corresponding to the preset range is not larger than R1, and the lower limit is not smaller than R3, specifically, the preset range may be (R2, R1), and R2 may be set according to experience or experimental values. After the preset range is set, the range of the signal intensity corresponding to the PE area is changed into: [ R3, R2 ].
Of course, the specific form of the parameter may be different, and the set range may be different. In practice, the preset range may be set according to experience or experimental calibration.
It should be noted that the receiving end may be, in addition to the in-vehicle receiver, another receiver or device, for example, a receiver or device located outside the vehicle, as long as the receiving end can receive the wireless signal, and this is not limited herein.
It should be noted that S402 is an optional step, and other conditions may also be used to trigger the acquisition of the sound pressure signal, such as manual triggering. The present embodiment is not limited.
S503: and the terminal collects sound pressure signals.
For a specific way of acquiring the sound pressure signal by the terminal, reference may be made to the foregoing embodiments, which are not described herein again.
S504: and the terminal sends the acquired sound pressure signal to the in-vehicle processor.
S505: the in-vehicle processor calculates a dispersion degree parameter of the sound pressure signal.
The calculation method of the dispersion degree parameter can be referred to the foregoing embodiments and the prior art, and is not described herein again.
S506: and the in-vehicle processor determines a target scene according to the discrete degree parameter and acquires a threshold corresponding to the target scene.
In this embodiment, different scenes correspond to respective thresholds. Specifically, the method for determining the correspondence between the scene and the threshold value includes: the method comprises the steps of acquiring an in-vehicle sound pressure signal and an out-vehicle sound pressure signal of any scene, further acquiring sound pressure signals of different positions in the vehicle under the scene, such as main driving, auxiliary driving, rear seats and a trunk, in order to ensure accuracy and universality of a threshold, and taking the average value of the sound pressure signals of the different positions as the in-vehicle sound pressure signal. Optionally, in order to ensure accuracy of the threshold, in the process of collecting the sound signal in the vehicle, the vehicle door and the vehicle window need to be closed to ensure that the space in the vehicle is a closed space.
And calculating the dispersion degree parameter of the sound pressure signal in the vehicle according to the sound pressure signal in the vehicle, and calculating the dispersion degree parameter of the sound pressure signal outside the vehicle according to the sound pressure signal outside the vehicle. And selecting a value between the dispersion degree parameter of the sound pressure signal inside the vehicle and the dispersion degree parameter of the sound pressure signal outside the vehicle as a threshold value corresponding to the scene. The selection may be based on experience, or an intermediate value, etc., and is not limited herein.
The discrete degree parameter of the sound pressure signal inside the vehicle and the discrete degree parameter of the sound pressure signal outside the vehicle under different scenes can be stored and used as a basis for determining a target scene according to the discrete degree parameter, namely: and comparing the calculated dispersion degree parameter with the dispersion degree parameter of the sound pressure signal inside the automobile and the dispersion degree parameter of the sound pressure signal outside the automobile under each scene, for example, finding out the stored dispersion degree parameter which is closest or most similar to the distance, and the stored dispersion degree parameter is called a target dispersion degree parameter, wherein the scene corresponding to the target dispersion degree is the target scene.
In practice, the threshold values corresponding to different scenes may be set in the in-vehicle processor before the vehicle is shipped from the factory. And the determined threshold values corresponding to the scenes are possibly different due to different vehicle types.
Optionally, in addition to determining the target scene according to the discrete degree parameter in S506, images including the vehicle and the scene where the vehicle is located may be collected, and the target scene may be determined according to the images. The specific implementation manner can be referred to in the prior art, and is not described in detail here.
S507: and the in-vehicle processor determines that the terminal is positioned outside the vehicle under the condition that the discrete degree parameter is greater than the corresponding threshold value of the target scene, and determines that the terminal is positioned inside the vehicle under the condition that the discrete degree parameter is not greater than the corresponding threshold value of the target scene.
Correspondingly, if the terminal enters the vehicle and the vehicle door and the vehicle window are closed, the terminal can be more accurately determined to be in the vehicle by using the threshold corresponding to the target scene based on the condition of obtaining the threshold that the vehicle interior is closed under the condition that the vehicle interior is a closed space.
Generally, after a person enters the vehicle from the outside of the vehicle, the door is closed and then the window is opened (or the window may not be opened), and the time interval from the closing of the door to the opening of the window is generally enough for the completion of the process execution, so that even if the person opens the window after getting on the vehicle, the embodiment of the application can also give a relatively accurate judgment result.
S508: the in-vehicle processor executes the PS logic if the terminal is inside the vehicle, and executes the PE logic if the terminal is outside the vehicle.
It should be noted that, in parallel with S502, if the in-vehicle processor determines that the terminal is in the PE area based on the received signal, the in-vehicle processor executes the PE logic, and if the in-vehicle processor determines that the terminal is in the PS area based on the received signal, the in-vehicle processor executes the PS logic.
As can be seen from the flow shown in fig. 5, acoustic feature positioning is combined with existing parameter positioning, and when the terminal is located in a critical area, the acoustic feature is used to determine whether the terminal is located inside or outside a vehicle, because a sound pressure signal is stable, the positioning result is more accurate, thereby facilitating correct execution of the PEPS logic.
It should be noted that the collector 41 is disposed on the terminal, and may be specifically a sound collector of the terminal, such as a microphone, for collecting the sound pressure signal. In this case, the processor 42 may also have the following functions: when the terminal enters the PE region, that is, the parameter of the signal transmitted by the terminal is received within the parameter range corresponding to the preset PE region, a start instruction is sent to the terminal, and the start instruction is used to control the collector 41 to start, so that the sound collector on the terminal is started before the terminal enters the critical region, and the problem that the sound pressure signal is not collected timely (that is, the sound pressure signal is not collected when the terminal enters the critical region but the hardware start is not completed) due to the delay of the hardware device start is avoided.
The functions described in the method of the embodiment of the present application, if implemented in the form of software functional units and sold or used as independent products, may be stored in a storage medium readable by a computing device. Based on such understanding, part of the contribution to the prior art of the embodiments of the present application or part of the technical solution may be embodied in the form of a software product stored in a storage medium and including several instructions for causing a computing device (which may be a personal computer, a server, a mobile computing device or a network device) to execute all or part of the steps of the method described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (14)
1. A method of positioning, comprising:
collecting a sound pressure signal;
and determining the position of the acquisition end of the sound pressure signal according to the dispersion degree parameter of the sound pressure signal.
2. The method of claim 1, wherein the acquiring an acoustic pressure signal comprises:
and acquiring the sound pressure signal under the condition that the parameter of the preset signal received by the receiving end is in a preset range, wherein the preset signal is sent out by the acquisition end, the upper limit value of the preset range is not more than the threshold value for executing the passive start of the PS logic, and the lower limit value is not less than the lower limit value for executing the passive entry of the PE logic.
3. The method of claim 1, wherein the dispersion degree parameter comprises:
variance or standard deviation.
4. The method of claim 1, wherein the determining the position of the acquisition end of the acoustic pressure signal according to the dispersion degree parameter comprises:
determining that the acquisition end is positioned in the vehicle under the condition that the discrete degree parameter is greater than a preset threshold value;
and under the condition that the discrete degree parameter is not greater than the preset threshold value, determining that the acquisition end is positioned outside the vehicle.
5. The method according to claim 4, wherein the method for determining the preset threshold value comprises:
aiming at any scene, acquiring a sound pressure signal inside a vehicle and a sound pressure signal outside the vehicle in the scene;
calculating a dispersion degree parameter of a sound pressure signal in the vehicle according to the sound pressure signal in the vehicle, and calculating a dispersion degree parameter of the sound pressure signal outside the vehicle according to the sound pressure signal outside the vehicle;
and determining a third preset threshold value as a threshold value corresponding to the scene according to the dispersion degree parameter of the sound pressure signal inside the vehicle and the dispersion degree parameter of the sound pressure signal outside the vehicle.
6. The method according to claim 5, wherein before said determining the position of the acquisition end of the acoustic pressure signal according to the dispersion degree parameter, further comprising:
determining a scene where the acquisition end is located;
and acquiring a threshold corresponding to the scene where the acquisition end is located.
7. A positioning system, comprising:
the collector is used for collecting sound pressure signals;
and the processor is used for determining the position of the collector according to the discrete degree parameter of the sound pressure signal.
8. The system of claim 7, wherein the processor is further configured to:
and under the condition that the parameter of a preset signal received by a receiving end is in a preset range, triggering the collector to collect the sound pressure signal, wherein the preset signal is sent out by the collector, the upper limit value of the preset range is not more than the threshold value for executing the passive start of the PS logic, and the lower limit value is not less than the lower limit value for executing the passive entry of the PE logic.
9. The system of claim 8, wherein the processor is disposed in an in-vehicle processing module of a pre-set PEPS system, and the collector is disposed in a pre-set terminal.
10. The system of claim 9, wherein the processor is further configured to:
sending a starting instruction to the collector under the condition that the parameter of the signal received by the in-vehicle module is in a range corresponding to a preset PE execution logic;
the collector is specifically configured to collect a sound pressure signal when the opening instruction is received.
11. The system of claim 7, wherein the dispersion degree parameter comprises:
variance or standard deviation.
12. The system of claim 7,
the processor is specifically configured to determine that the collector is located in the vehicle when the discrete degree parameter is greater than a preset threshold; and determining that the collector is positioned outside the vehicle under the condition that the discrete degree parameter is not greater than the preset threshold value.
13. The system of claim 12, wherein the processor is further configured to:
aiming at any scene, acquiring a sound pressure signal inside a vehicle and a sound pressure signal outside the vehicle in the scene; calculating a dispersion degree parameter of a sound pressure signal in the vehicle according to the sound pressure signal in the vehicle, and calculating a dispersion degree parameter of the sound pressure signal outside the vehicle according to the sound pressure signal outside the vehicle; and determining a third preset threshold value as a threshold value corresponding to the scene according to the dispersion degree parameter of the sound pressure signal inside the vehicle and the dispersion degree parameter of the sound pressure signal outside the vehicle.
14. The system of claim 13, wherein the processor is further configured to:
before the position of the collector is determined according to the discrete degree parameter, determining the scene where the collector is located; and acquiring a threshold corresponding to the scene where the collector is located.
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