CN112147570A - Positioning method and system - Google Patents

Abstract

The present application provides a positioning method and system, which uses the discrete degree parameter of the sound pressure signal to determine the position of the collecting end of the sound pressure signal. Compared with the existing positioning method based on the parameters of the signal, it has higher advantages accuracy.

Description

A positioning method and system

technical field

The present application relates to the field of electronic information, and in particular, to a positioning method and system.

Background technique

In recent years, keyless entry and start (Passive Entry Passive Start, PEPS) systems have been widely used in automobiles. The basic technical logic of PEPS is: the terminal (car key or mobile phone) transmits a wireless signal, a wireless receiver is arranged on the vehicle, and the wireless signal transmitted by the terminal (car key or mobile phone) is received. Signal strength), determine the area where the terminal is located. As shown in Figure 1, when it is determined that the terminal is in the PE area, the passive entry PE logic is executed, and when it is determined that the terminal is in the PS area, the passive PS logic is executed.

At present, there are certain errors in the positioning method based on wireless signals. For example, the terminal located in the vehicle is determined to be outside the vehicle, which leads to 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 but the startup logic is executed. ).

SUMMARY OF THE INVENTION

The present application provides a positioning method and system, which aims to solve the problem of logical errors in PEPS execution caused by inaccurate positioning.

In order to achieve the above purpose, the application provides the following technical solutions:

A positioning method comprising:

Collect sound pressure signals;

The position of the collecting end of the sound pressure signal is determined according to the discrete degree parameter of the sound pressure signal.

Optionally, the collection of sound pressure signals includes:

In the case that the parameters of the preset signal received by the receiving end are within the preset range, the sound pressure signal is collected, the preset signal is sent by the collecting end, and the upper limit of the preset range is not greater than the execution value. The threshold for passively starting PS logic, and the lower limit is not less than the lower limit for passively entering PE logic.

Optionally, the discrete degree parameter includes:

variance or standard deviation.

Optionally, the determining the position of the collection end of the sound pressure signal according to the discrete degree parameter includes:

In the case that the discrete degree parameter is greater than a preset threshold, it is determined that the collection terminal is located in the vehicle;

In the case that the discrete degree parameter is not greater than the preset threshold, it is determined that the collection end is located outside the vehicle.

Optionally, the method for determining the preset threshold includes:

For any scene, collect the sound pressure signal inside the car and the sound pressure signal outside the car under the scene;

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;

According to 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, a third preset threshold is determined as the threshold corresponding to the scene.

Optionally, before the determining the position of the sound pressure signal collection end according to the discrete degree parameter, the method further includes:

determining the scene where the collection terminal is located;

Obtain the threshold corresponding to the scene where the collection terminal is located.

A positioning system comprising:

Collector, used to collect sound pressure signal;

The processor is configured to determine the position of the collector according to the discrete degree parameter of the sound pressure signal.

Optionally, the processor is also used for:

When the parameters of the preset signal received by the receiving end are within the preset range, trigger the collector to collect the sound pressure signal, the preset signal is sent by the collector, and the upper part of the preset range is triggered. The limit value is not greater than the threshold value for executing passive start PS logic, and the lower limit value is not less than the lower limit value for executing passive entry PE logic.

Optionally, the processor is set in an in-vehicle processing module of a preset PEPS system, and the collector is set in a preset terminal.

Optionally, the processor is also used for:

When the parameters of the signal received by the in-vehicle module are within the range corresponding to the preset PE execution logic, send an opening instruction to the collector;

The collector is specifically configured to collect the sound pressure signal in the case of receiving the opening instruction.

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 determine that the collector is located in the vehicle when the discrete degree parameter is not greater than the preset threshold. The collector is located outside the vehicle.

Optionally, the processor is also used for:

For any scene, collect the sound pressure signal inside the car and the sound pressure signal outside the car; calculate the discrete degree parameter of the sound pressure signal in the car according to the sound pressure signal in the car, The sound pressure signal calculates the dispersion degree parameter of the sound pressure signal outside the vehicle; 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, a third preset threshold is determined as the scene corresponding threshold.

Optionally, the processor is also used for:

Before determining the location of the collector according to the discrete degree parameter, a scene where the collector is located is determined; a threshold corresponding to the scene where the collector is located is obtained.

The positioning method and system described in the present application use the discrete degree parameter of the sound pressure signal to determine the position of the collecting end of the sound pressure signal, which has higher accuracy than the existing positioning method based on the parameters of the signal. sex.

Description of drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without any creative effort.

Figure 1(a) is an example diagram of the existing PE area and PS area;

FIG. 1(b) is an exemplary diagram of a PE region, a critical region, and a PS region disclosed in an embodiment of the present application;

Fig. 2 is an example diagram of an existing PEPS system;

3 is a flowchart of a positioning method disclosed in an embodiment of the present application;

4 is a schematic structural diagram of a positioning system disclosed in an embodiment of the present application;

FIG. 5 is a flowchart of yet another positioning method disclosed in an embodiment of the present application.

Detailed ways

The positioning method, system, and terminal disclosed in the embodiments of the present application can be applied in a PEPS system to achieve a more accurate positioning function. As shown in FIG. 2 , an example of an existing PEPS system includes a terminal and an in-vehicle processing module, wherein the terminal is used for transmitting wireless signals. The in-vehicle processing module includes an in-vehicle receiver for receiving wireless signals, and is used to determine whether the terminal is in the car or outside the car according to the parameters of the wireless signal received by the receiver, and trigger the PE or the terminal according to the position of the terminal. In-vehicle processor for PS Logic.

Compared with the prior art, the positioning method described in the following embodiments of the present application adds the technical means of positioning based on acoustic characteristics, so as 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. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this application.

FIG. 3 is a positioning method disclosed by an embodiment of the application, comprising the following steps:

S301: Collect sound pressure signals.

Sound pressure refers to the amount of pressure change caused by vibration when sound waves pass through a medium. Usually, the sound pressure signal can be collected 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: a preset sampling rate such as any one of 8000Hz-384000Hz, a preset sampling number such as any one of 4bits-32bits, a preset number of channels such as 1 or 2, and a preset The sampling time period is any one of 1-5000 milliseconds, for example, the sound pressure signal is collected. For example, at a sampling frequency of 8000Hz, collect sound pressure signals within a range of 1000 milliseconds in multiple sampling time periods. The collected sound signals are stored in 4 bits, and the number of channels used by the acquisition device is 2.

S302: Determine the position of the collecting end of the sound pressure signal according to the discrete degree parameter of the sound pressure signal.

In this embodiment, the sound pressure signal collection terminal is the terminal shown in FIG. 2 .

The discrete degree parameter of the sound pressure signal may be the variance or standard deviation of the sound pressure signal. Assuming that N sound pressure signals are collected, 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, when the sampling time period is set, the sound pressure signal with the largest sound pressure value collected in any sampling time period is used as the sound signal in the sampling time period. N sampling time periods correspond to N sound pressure signals.

Because the difference between the sound pressure signals is small, optionally, you can use the formula: dB=20log(P/Po) to calculate the decibel value of the sound pressure signal, and use the decibel value as the sound pressure signal to improve the difference between the sound pressure signals. The difference is convenient for subsequent judgment. Among them, dB represents the decibel value, P represents the sound pressure value of the collected sound pressure signal, and Po is the lowest sound pressure amplitude 20 millionths of a Pascal (20 μPa) that the human ear can perceive.

Specifically, when the discrete degree parameter is greater than the preset threshold, it is determined that the collecting end is located outside the vehicle, and when the discrete degree parameter is not greater than the preset threshold, it is determined that the collecting end is located in the vehicle.

It can be seen from the process shown in FIG. 1 that, unlike the positioning method in the prior art, the sound pressure signal is used for positioning, so it has the following beneficial effects:

1. In the existing method for positioning using signal strength, because the shielding effect of the shielding material for the wireless signal in the vehicle body is poor, a part of the wireless signal will leak outside the vehicle, thus leading to a misjudgment of positioning. However, in this embodiment, sound pressure is used for localization, so there is no problem of signal leakage, so compared with the localization method using signal strength, it has higher accuracy. In addition, because the receiver needs to receive the very weak wireless signal submerged in the noise, the receiver needs more power, and the energy consumption increases, and the use of sound pressure for positioning, only the sound pressure signal of the noise can be collected, and the energy consumption is greatly reduced. .

2. The existing method of using signal time-of-flight positioning requires the system to have an accurate clock to record the time of transmission and reception, while positioning using sound pressure does not require clock synchronization. Therefore, the requirements for the system are not high and it is easy to implement .

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 , wherein the collector 41 is used to collect sound pressure signals, The processor 42 is configured to determine the position of the collector 41 according to the discrete degree parameter of the sound pressure signal.

Combined with the architecture of the existing PEPS system shown in FIG. 2 , the collector 41 is set in the terminal, and the processor 42 can be set in the terminal or in the vehicle (for example, it can be used as an in-vehicle processor or another processor other than the in-vehicle processor. processor). In order to improve the reliability of the positioning result, the processor 42 is preferably arranged in the vehicle.

The following will take the collector 41 installed in the terminal and the processor 42 installed in the vehicle (ie, as an in-vehicle processor) as an example, and combined with the existing PEPS technology, the flow shown in FIG. 3 will be described in detail.

FIG. 5 is another positioning method disclosed by an embodiment of the present application, comprising the following steps:

S501: The terminal transmits a wireless signal.

In this embodiment, reference may be made to the existing PEPS technology for the specific implementation manner of the terminal transmitting the wireless signal, for example, continuously transmitting or periodically transmitting the wireless signal, which is not limited here.

S502: The in-vehicle processor triggers the terminal to collect the sound pressure signal when it is determined that the terminal is in the critical region according to the signal received by the in-vehicle receiver (ie, the receiving end).

As shown in FIG. 1( b ), based on the division of the PE area and the PS area in FIG. 1( a ), in this embodiment, a critical area is added between the PE area and the PS area. The critical area is an area with a high misjudgment rate. The requirements for the critical area are: include most or all of the area inside the vehicle, and try not to include the area outside the vehicle.

Specifically, the critical region may be predetermined according to the calibration of the parameters of the wireless signal. For example, for a certain vehicle type, the parameters of the wireless signals received by the in-vehicle processor when the terminals are located inside and outside the vehicle are collected in advance, and the parameters of the signals received in the vehicle and outside the vehicle are determined according to the parameter values. The parameter range of the wireless signal corresponding to the critical region.

In this embodiment, after receiving the wireless signal sent by the terminal, it is also 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 refer to the prior art, for example, the parameters of the wireless signal include but are not limited to: the strength of the wireless signal, the flight time of the wireless signal, and the angle of arrival or the departure angle of the wireless signal.

Taking the parameter of the signal as the signal strength 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 area, the strength of the signal received by the receiver is in (R2, R1), the terminal is located in the PE area, and the strength of the signal received by the receiver is in [R3, R2].

It can be seen from the above description that, in practice, the different regions divided may only be virtual regions, and different virtual regions are only defined by different ranges of parameters. That is, when the parameters of the signal received by the in-vehicle processor at the receiving end are within the preset range, the acquisition of the sound pressure signal is triggered.

The preset range is the range corresponding to the critical region, the upper limit of the preset region is not greater than the threshold for executing PS logic, and the lower limit is not less than the lower limit for executing PE logic. Taking the parameter of the signal as the signal strength as an example: Assuming that in the prior art, the signal strength corresponding to the PS area is greater than or equal to R1, and the range of the signal strength corresponding to the PE area is: less than R1 and not less than R3, then the preset range The upper limit of the corresponding signal strength range is not greater than R1, and the lower limit is not less than R3. Specifically, the preset range may be (R2, R1), and R2 may be set based on experience or experimental values. After the preset range is set, the range of the signal strength corresponding to the PE area is changed to: [R3, R2].

Of course, the specific form of the parameter is different, and the setting range may be different. In practice, the preset range can be set based on experience or experimental calibration values.

It should be noted that the receiving end can be not only an in-vehicle receiver, but also other receivers or devices, such as a receiver or device located outside the car, as long as it can receive wireless signals, which is not limited here.

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. This embodiment is not limited.

S503: The terminal collects the sound pressure signal.

For the specific manner in which the terminal collects the sound pressure signal, reference may be made to the foregoing embodiments, which will not be repeated here.

S504: The terminal sends the collected sound pressure signal to the in-vehicle processor.

S505: The in-vehicle processor calculates the discrete degree parameter of the sound pressure signal.

For the calculation method of the discrete degree parameter, reference may be made to the foregoing embodiments and the prior art, and details are not repeated here.

S506: The in-vehicle processor determines the target scene according to the discrete degree parameter, and obtains a threshold corresponding to the target scene.

In this embodiment, different scenarios correspond to respective thresholds. Specifically, the method for determining the corresponding relationship between the scene and the threshold is: for any scene, collect the sound pressure signal inside the vehicle and the sound pressure signal outside the vehicle under the scene, and further, in order to ensure the accuracy and universality of the threshold, Collect the sound pressure signals at different positions in the car in this scene, such as the main driver, co-pilot, rear seat and trunk, and take the average value of the sound pressure signals at different positions as the sound pressure signal in the car. Optionally, in order to ensure the accuracy of the threshold value, in the process of collecting the sound signal in the vehicle, it is necessary to close the vehicle door and the vehicle window to ensure that the interior space of the vehicle is a closed space.

The dispersion degree parameter of the sound pressure signal in the vehicle is calculated according to the sound pressure signal in the vehicle, and the dispersion degree parameter of the sound pressure signal outside the vehicle is calculated according to the sound pressure signal outside the vehicle. A value is selected between 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 as the threshold value corresponding to the scene. It can be selected based on experience, or an intermediate value can be selected, which is not limited here.

The discrete degree parameter of the sound pressure signal inside the car and the discrete degree parameter of the sound pressure signal outside the vehicle in different scenarios can be stored as the basis for determining the target scene according to the discrete degree parameter, that is: the calculated discrete degree parameter, and The discrete degree parameter of the sound pressure signal inside the vehicle in each scene is compared with the discrete degree parameter of the sound pressure signal outside the vehicle, for example, to find the closest or most similar stored discrete degree parameter, which is called the target discrete degree parameter. The scene corresponding to the target discrete degree is the target scene.

It should be noted that, in practice, thresholds corresponding to different scenarios can be set in the in-vehicle processor before the vehicle leaves the factory. Different models may have different thresholds corresponding to the determined scenes.

Optionally, in addition to determining the target scene according to the discrete degree parameter described in S506, it is also possible to collect images including the vehicle and the scene where the vehicle is located, and determine the target scene according to the image. For a specific implementation manner, reference may be made to the prior art, which will not be repeated here.

S507: The in-vehicle processor determines that the terminal is outside the vehicle when the discrete degree parameter is greater than the threshold corresponding to the target scene, and determines that the terminal is in the vehicle when the discrete degree parameter is not greater than the threshold corresponding to the target scene.

Correspondingly, if the terminal has entered the car, and the doors and windows are closed to ensure that the car is a confined space, based on the condition of the confined space in the car obtained by the threshold value, using the threshold value corresponding to the target scene can be more accurate. Accurately determine that the terminal is in the vehicle.

Usually, after entering the car from outside the car, the person will first close the door and then open the window (or may not open the window), and the time interval from closing the door to opening the window is generally sufficient to complete the process described in this application. When the window is opened after getting in the car, the embodiment of the present application can also give a relatively accurate determination result.

S508: If the terminal is in the vehicle, the in-vehicle processor executes the PS logic, and if the terminal is outside the vehicle, the in-vehicle processor executes the PE logic.

It should be noted that, in parallel with S502, if the in-vehicle processor determines that the terminal is in the PE area according to the received signal, the in-vehicle processor executes the PE logic. When the terminal is in the PS area, the in-vehicle processor executes the PS logic.

It can be seen from the process shown in Figure 5 that the acoustic feature positioning is combined with the existing parameter positioning. When the terminal is located in the critical area, the acoustic feature is used to determine whether the terminal is located in the vehicle or outside the vehicle, because the sound pressure signal is relatively stable , therefore, the positioning result is more accurate, which is beneficial to the correct execution of the PEPS logic.

It should be noted that the collector 41 is set on the terminal, and may specifically be a sound collector of the terminal, such as a microphone, to collect sound pressure signals. In this case, the processor 42 may also have the following function: when the terminal enters the PE area, that is, when the parameters of the received signal transmitted by the terminal are within the preset parameter range corresponding to the PE area, send an opening instruction to the terminal to enable The instruction is used to control the collector 41 to be turned on, so that the sound collector on the terminal can be turned on before the terminal enters the critical area, so as to avoid the untimely acquisition of the sound pressure signal caused by the delay in turning on the hardware device (that is, it has entered the critical area). But the hardware startup is not completed and the sound pressure signal is not collected).

If the functions described in the methods of the embodiments of the present application are implemented in the form of software functional units and sold or used as independent products, they may be stored in a readable storage medium of a computing device. Based on this understanding, the part of the embodiments of the present application that contribute to the prior art or the part of the technical solution may be embodied in the form of a software product, and the software product is stored in a storage medium and includes several instructions to make a A computing device (which may be a personal computer, a server, a mobile computing device or a network device, etc.) executes all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: U disk, removable hard disk, Read-Only Memory (ROM, Read-Only Memory), Random Access Memory (RAM, Random Access Memory), magnetic disk or optical disk and other media that can store program codes .

The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same or similar parts of the various embodiments may be referred to each other.

The above description of the disclosed embodiments enables 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 implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, this 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 positioning method, is characterized in that, comprises: Collect sound pressure signals; The position of the collecting end of the sound pressure signal is determined according to the discrete degree parameter of the sound pressure signal. 2. The method according to claim 1, wherein the collecting the sound pressure signal comprises: In the case that the parameters of the preset signal received by the receiving end are within the preset range, the sound pressure signal is collected, the preset signal is sent by the collecting end, and the upper limit of the preset range is not greater than the execution value. The threshold for passively starting PS logic, and the lower limit is not less than the lower limit for passively entering PE logic. 3. The method according to claim 1, wherein the discrete degree parameter comprises: variance or standard deviation. 4. The method according to claim 1, wherein the determining the position of the acquisition end of the sound pressure signal according to the discrete degree parameter comprises: In the case that the discrete degree parameter is greater than a preset threshold, it is determined that the collection terminal is located in the vehicle; In the case that the discrete degree parameter is not greater than the preset threshold, it is determined that the collection end is located outside the vehicle. 5. The method according to claim 4, wherein the method for determining the preset threshold comprises: For any scene, collect the sound pressure signal inside the car and the sound pressure signal outside the car under the scene; 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; According to 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, a third preset threshold is determined as the threshold corresponding to the scene. 6 . The method according to claim 5 , wherein before the determining the position of the acquisition end of the sound pressure signal according to the discrete degree parameter, the method further comprises: 7 . determining the scene where the collection terminal is located; Obtain the threshold corresponding to the scene where the collection terminal is located. 7. A positioning system, characterized in that, comprising: Collector, used to collect sound pressure signal; The processor is configured to determine 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: When the parameters of the preset signal received by the receiving end are within the preset range, trigger the collector to collect the sound pressure signal, the preset signal is sent by the collector, and the upper part of the preset range is triggered. The limit value is not greater than the threshold value for executing passive start PS logic, and the lower limit value is not less than the lower limit value for executing passive entry PE logic. 9 . The system according to claim 8 , wherein the processor is set in an in-vehicle processing module of a preset PEPS system, and the collector is set in a preset terminal. 10 . 10. The system of claim 9, wherein the processor is further configured to: When the parameters of the signal received by the in-vehicle module are within the range corresponding to the preset PE execution logic, send an opening instruction to the collector; The collector is specifically configured to collect the sound pressure signal in the case of receiving the opening instruction. 11. The system according to claim 7, wherein the discrete degree parameter comprises: variance or standard deviation. 12. The system of claim 7, wherein The processor is specifically configured to, when the discrete degree parameter is greater than a preset threshold, determine that the collector is located in the vehicle; under the condition that the discrete degree parameter is not greater than the preset threshold, determine that the collector is located in the vehicle. The collector is located outside the vehicle. 13. The system of claim 12, wherein the processor is further configured to: For any scene, collect the sound pressure signal inside the car and the sound pressure signal outside the car; calculate the discrete degree parameter of the sound pressure signal in the car according to the sound pressure signal in the car, The sound pressure signal calculates the dispersion degree parameter of the sound pressure signal outside the vehicle; 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, a third preset threshold is determined as the scene the corresponding threshold. 14. The system of claim 13, wherein the processor is further configured to: Before determining the location of the collector according to the discrete degree parameter, a scene where the collector is located is determined; a threshold corresponding to the scene where the collector is located is obtained.

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