[0028] Example 1
[0029] figure 1 A flowchart of a method for correcting a crystal oscillation frequency according to an embodiment of the present disclosure is shown. The method may be applied to a receiving device. In an example, the method may be applied to a receiving device in a positioning system, and the positioning system may also include a transmitting device. The positioning system can send communication frames between the sending device and the receiving device, and calculate the distance between the sending device and the receiving device according to the time of sending and receiving the communication frame, and then complete positioning.
[0030] Such as figure 1 As shown, the crystal oscillation frequency correction method includes:
[0031] Step 101: Receive a first communication frame from a sending device, and record the time T2 when the first communication frame is received;
[0032] Step 102: Send a first reply frame to the sending device according to the first communication frame, and record the time T3 when the first reply frame is sent;
[0033] Step 103: Receive a second communication frame sent by the sending device in response to the first reply frame, and record the time T6 when the second communication frame is received;
[0034] Step 104: Obtain, through the second communication frame, the time T1 when the sending device sends the first communication frame, the time T4 when the first reply frame is received, and the time T5 when the second communication frame is sent;
[0035] Step 105: Determine the frequency difference between the receiving device and the sending device according to the time T1, the time T2, the time T3, the time T4, the time T5, and the time T6;
[0036] Step 106: Adjust the crystal oscillation frequency according to the frequency difference.
[0037] For example, in a coal mine personnel positioning system, the sending device may be an identification card carried by the coal mine personnel, and the receiving device may be a card reader installed in a roadway.
[0038] figure 2 It shows a schematic diagram of interaction between a sending device and a receiving device according to an embodiment of the present disclosure. Such as figure 2 As shown, in order to perform positioning, the sending device A sends the first communication frame to the receiving device at time T1 and records the time T1 when the first communication frame is sent; the receiving device B receives the first communication frame at time T2 and records This reception time T2. It should be noted that, in a possible implementation manner, the sending device A can intermittently send communication frames to the receiving device B for positioning.
[0039] In response to the received first communication frame, the receiving device B may determine the delay t1 according to the current crystal oscillator frequency of the receiving device B, and send the first reply frame corresponding to the first communication frame to the sending device A after the delay time t1, and Record the sending time T3 of the first reply frame.
[0040] The sending device A receives the first reply frame at time T4, and records the receiving time T4. In response to the first reply frame, the sending device A can determine the delay t2 according to the current crystal oscillator frequency of the receiving device, send the second communication frame to the sending device B after the delay time t2, and record the sending time of the second communication frame T5. Wherein, in a possible implementation manner, the second communication frame may carry the time T1 when the sending device A sends the first communication frame, the time T4 when the first reply frame is received, and the time T4 when the second communication frame is sent. The moment T5.
[0041] The receiving device B receives the above-mentioned second communication frame at time T6, and records the receiving time T6.
[0042] In a possible implementation manner, as described above, since the second communication frame may carry time T1, time T4, and time T5, the receiving device B can obtain the sending device A through the second communication frame. The time T1 when the first communication frame is sent, the time T4 when the first reply frame is received, and the time T5 when the second communication frame is sent.
[0043] In another possible implementation manner, the above-mentioned receiving device B may also obtain the time T1 when the sending device A sends the first communication frame through the first communication frame. For example, the first communication frame sent by the sending device A A communication frame may carry the time T1 when the first communication frame is sent; the receiving device B may obtain the time T4 when the sending device A receives the first reply frame through the second communication frame, and send the first communication frame Second, the time T5 of the communication frame. For example, the second communication frame sent by the sending device A may carry the time T4 when the sending device A receives the first reply frame and the time T5 when the second communication frame is sent. The present invention does not specifically limit the manner in which the receiving device B obtains the time T1 when the sending device A sends the first communication frame, the time T4 when the first reply frame is received, and the time T5 when the second communication frame is sent.
[0044] Time T1 Time T4 Time T5 Time T1 Time T2 Time T3 Time T4 Time T5 Time T6
[0045] The receiving device B can parse the above-mentioned second communication frame to obtain the time T1 when the sending device A sends the first communication frame, the time T4 when the first reply frame is received, and the time T5 when the second communication frame is sent, and The frequency difference between the receiving device and the sending device is determined according to the time T1, the time T2, the time T3, the time T4, the time T5, and the time T6.
[0046] The receiving device B can also adjust the crystal oscillation frequency of the receiving device B according to the determined frequency difference. For example, when the frequency difference is greater than 0, it indicates that the crystal oscillation frequency of the receiving device B is higher than that of the sending device A, which can reduce the reception The crystal oscillation frequency of device B, or, when the frequency difference is less than 0, indicates that the crystal oscillation frequency of receiving device B is lower than that of sending device A, and the crystal oscillation frequency of receiving device B can be increased.
[0047] The receiving device can determine the frequency difference between the receiving device and the transmitting device through the data obtained during the communication process of the SDS-TWR ranging method, realize real-time and online calibration of the crystal oscillator frequency of the receiving device, and improve the receiving sensitivity of the receiving device. Compared with the laboratory calibration method or the on-site calibration through the connection line, manual operation is not required, the calibration is automatically realized, and the algorithm is simple, and no additional expenses are required.
[0048] image 3 A flowchart of a method for correcting a crystal oscillation frequency according to an embodiment of the present disclosure is shown.
[0049] In a possible implementation, refer to image 3 , Step S105, a step of determining the frequency difference between the receiving device and the sending device according to the time T1, the time T2, the time T3, the time T4, the time T5, and the time T6 , Can include:
[0050] Step 1051: Determine the first time difference of the sending device according to the time T4 and the time T1, and determine the second time difference of the sending device according to the time T5 and the time T4;
[0051] Step 1052: Determine the first time difference of the receiving device according to the time T3 and the time T2, and determine the second time difference of the receiving device according to the time T6 and the time T3;
[0052] Step 1053: Determine the frequency difference between the receiving device and the sending device according to the first time difference of the sending device, the second time difference of the sending device, the first time difference of the receiving device, and the second time difference of the receiving device.
[0053] In the above method, the first time difference between sending device A receiving the first reply frame and sending the first communication frame may be: T4-T1; the second time difference between sending device A sending the second communication frame and receiving the first reply frame may be For: T5-T4.
[0054] The first time difference between receiving device B sending the first reply frame and receiving the first communication frame may be: T3-T2; the second time difference between receiving device B receiving the second communication frame and sending the first reply frame may be: T6-T3.
[0055] The receiving device B can determine the frequency difference between the receiving device B and the sending device A according to the first time difference, the second time difference of the sending device A, the first time difference, and the second time difference of the receiving device B. For example, it can be based on the sending device A The ratio of the sum of the first time difference and the second time difference to the sum of the first time difference and the second time difference of the receiving device B determines the frequency difference between the receiving device B and the sending device A.
[0056] Figure 4 A flowchart of a method for correcting a crystal oscillation frequency according to an embodiment of the present disclosure is shown.
[0057] In a possible implementation, refer to Figure 4 , Step S1053, determining the frequency difference between the receiving device and the sending device according to the first time difference of the sending device, the second time difference of the sending device, the first time difference of the receiving device, and the second time difference of the receiving device includes:
[0058] Step 10531: Determine the value S1 of the sum of the first time difference of the sending device and the second time difference of the sending device, the value S2 of the sum of the first time difference of the receiving device and the second time difference of the receiving device, and S1 and S2 Ratio of
[0059] Step 10532: Determine the difference between the ratio and 1 as the frequency difference.
[0060] For example, the frequency difference can be determined by Formula 1:
[0061]
[0062] The above e may represent the frequency difference between the sending device A and the receiving device B; the above t roundA It can represent the first time difference between the sending device A receiving the first reply frame and sending the first communication frame; the above t replyA It can represent the second time difference between sending device A sending the second communication frame and receiving the first reply frame; the above t replyB It may represent the first time difference between receiving device B sending the first reply frame and receiving the first communication frame; the above t roundB It may indicate the second time difference between receiving device B receiving the second communication frame and sending the first reply frame. Wherein, the value of the sum of the first time difference of the sending device A and the second time difference of the sending device A is S1=t roundA +t replyA; The value of the sum of the first time difference of the receiving device B and the second time difference of the receiving device B S2=t roundB +t replyB.
[0063] The receiving device B can determine the frequency difference with the sending device A according to the above method, and adjust the crystal oscillation frequency of the receiving device according to the frequency difference, so as to reduce the frequency difference between the receiving device B and the sending device A, and improve the receiving device B's frequency difference. Receiving sensitivity.
[0064] Figure 5 A flowchart of a method for correcting a crystal oscillation frequency according to an embodiment of the present disclosure is shown.
[0065] In a possible implementation, refer to Figure 5 The step of adjusting the oscillation frequency of the crystal oscillator according to the frequency difference may include:
[0066] Step 1061, when the frequency difference does not meet the frequency difference threshold condition, adjust the crystal oscillator frequency according to the frequency difference.
[0067] Wherein, the frequency difference threshold condition may be a frequency difference value range determined by those skilled in the art according to requirements. When the frequency difference meets the frequency difference value range, the influence of the frequency difference on the receiving sensitivity of the receiving device B can be ignored. When the frequency difference value range is not satisfied, the frequency difference has a greater influence on the receiving sensitivity of the receiving device, and the receiving device needs to adjust the crystal oscillation frequency according to the frequency difference. For example, the frequency difference threshold may be 10 ppm, and the corresponding frequency difference threshold condition may be: the value of the frequency difference is greater than -10 ppm and less than 10 ppm, or the absolute value of the frequency difference is less than 10 ppm. When the absolute value of the frequency difference is less than 10ppm (the value of the frequency difference is greater than -10ppm and less than 10ppm), it means that the current frequency difference between the sending device A and the receiving device B is within the specified range, and the frequency difference threshold condition is met. The impact on the receiving sensitivity of receiving device B is small, so receiving device B does not need to adjust the crystal oscillation frequency; when the absolute value of the frequency difference is greater than or equal to 10ppm (the value of the frequency difference is less than -10ppm, or the frequency difference Value is greater than 10ppm), indicating that the current frequency difference between the sending device A and the receiving device B is not within the specified range and does not meet the frequency difference threshold condition. The frequency difference has a greater impact on the receiving sensitivity of the receiving device B, so the receiving device B can follow The frequency difference adjusts the crystal oscillation frequency. For example, when the frequency difference is greater than 10ppm, the receiving device B can adjust the crystal oscillation frequency according to the frequency difference. The adjustment process can be: reduce the crystal oscillation frequency of the receiving device B, and the method to reduce The above-mentioned crystal oscillation frequency may be reduced by a fixed value; or, when the frequency difference is less than -10 ppm, the crystal oscillation frequency of the receiving device B may be increased by a fixed value. Alternatively, the receiving device B may also determine the amplitude of adjusting the crystal oscillator frequency according to the frequency difference. For example, different frequency differences correspond to different adjustment values. The embodiment of the present invention does not specifically limit the above-mentioned crystal oscillator frequency adjustment scheme.
[0068] In this way, during the communication interaction positioning process between the receiving device B and the sending device A, the sending time of the first communication frame and the second communication frame sent by the sending device A (time T1, time T5), the receiving device B receives the first communication Frame, the receiving time of the second communication frame (time T2, time T6), the sending time of receiving device B sending the first reply frame (time T3), and the receiving time of sending device A receiving the first reply frame (time T4), you can The frequency difference with the sending device A is calculated in real time, and the crystal oscillation frequency of the receiving device B is corrected in real time according to the frequency difference, so as to reduce the frequency difference between the two and improve the receiving sensitivity of the receiving device B. The crystal oscillator frequency correction method according to the above-mentioned embodiment of the present disclosure can simplify the operation of crystal oscillator frequency correction and save manpower; and since the present invention can be corrected in real time during the communication process of positioning, it can be applied to engineering sites.
[0069] Image 6 A flowchart of a method for correcting a crystal oscillation frequency according to an embodiment of the present disclosure is shown. In a possible implementation, refer to Image 6 , The above method may also include:
[0070] Step 107: Determine the frequency difference between the receiving device and the sending device according to the time T1, the time T2, the time T5, and the time T6.
[0071] The receiving device B may determine the third time difference of the sending device A according to the time T1 and the time T5: T5-T1, and may also determine the third time difference of the receiving device B according to the time T2 and the time T6: T6- T2: The receiving device B may calculate the ratio S3 of the third time difference of the sending device A to the third time difference of the receiving device B, and then determine the difference between the ratio S3 and 1 as the frequency difference.
[0072] Figure 7 A flowchart of a method for correcting a crystal oscillation frequency according to an embodiment of the present disclosure is shown.
[0073] In a possible implementation, refer to Figure 7 , The above method may also include:
[0074] Step 108: Determine the frequency difference between the receiving device B and the sending device A according to the time T2, the time T3, the time T4, and the time T5.
[0075] The receiving device B may determine the fourth time difference of the sending device A according to the time T4 and the time T5: T5-T4, and may determine the fourth time difference of the receiving device B according to the time T2 and the time T3: T3-T2 The receiving device B may calculate the ratio S4 of the fourth time difference of the sending device A and the fourth time difference of the receiving device B, and then determine the difference between the ratio S4 and 1 as the frequency difference.
[0076] Figure 8 Shows a structural block diagram of a crystal oscillator frequency correction device according to an embodiment of the present disclosure, such as figure 1 As shown, the crystal oscillator frequency correction device includes: a first receiving module 801, a first sending module 802, a second receiving module 803, a second sending module 804, a first determining module 805, and an adjusting module 806; among them,
[0077] The first receiving module 801 may be used to receive the first communication frame from the sending device, and record the time T2 when the first communication frame is received;
[0078] The first sending module 802 may be configured to send a first reply frame to the sending device according to the first communication frame, and record the time T3 when the first reply frame is sent;
[0079] The second receiving module 803 may be configured to receive a second communication frame sent by the sending device in response to the first reply frame, and record the time T6 when the second communication frame is received;
[0080] The first obtaining module 804 may be configured to obtain, through the second communication frame, the time T1 when the sending device sends the first communication frame, the time T4 when the first reply frame is received, and the second communication Time T5 of the frame;
[0081] The first determining module 805 may be configured to determine the receiving device and the sending device according to the time T1, the time T2, the time T3, the time T4, the time T5, and the time T6 的frequency difference;
[0082] The adjustment module 806 may be used to adjust the crystal oscillation frequency according to the frequency difference.
[0083] Picture 9 A structural block diagram of a crystal oscillator frequency correction device according to an embodiment of the present disclosure is shown. In a possible implementation, refer to Picture 9 The first determining module 805 of the crystal oscillator frequency correction device may include:
[0084] The first determining submodule 8051 may be configured to determine the first time difference of the sending device according to the time T4 and the time T1, and determine the second time difference of the sending device according to the time T5 and the time T4;
[0085] The second determining submodule 8052 may be configured to determine the first time difference of the receiving device according to the time T3 and the time T2, and determine the second time difference of the receiving device according to the time T6 and the time T3;
[0086] The third determining submodule 8053 may be used to determine the frequency between the receiving device and the sending device according to the first time difference of the sending device, the second time difference of the sending device, the first time difference of the receiving device, and the second time difference of the receiving device. difference.
[0087] In a possible implementation, refer to Picture 9 , The third determining sub-module 8053 of the above crystal oscillator frequency correction device may include:
[0088] The first determining unit 80531 may be used to determine the value S1 of the sum of the first time difference of the sending device and the second time difference of the sending device, and the value of the sum of the first time difference of the receiving device and the second time difference of the receiving device S2, and the ratio of S1 to S2;
[0089] The second determining unit 80532 may be used to determine the difference between the ratio and 1 as the frequency difference.
[0090] In a possible implementation, refer to Picture 9 The adjustment module 806 of the above crystal oscillation frequency correction device may include:
[0091] The adjustment sub-module 8061 may be configured to adjust the crystal oscillation frequency according to the frequency difference when the frequency difference does not meet the frequency difference threshold condition.
[0092] In a possible implementation manner, the above crystal oscillator frequency correction device further includes:
[0093] The second obtaining module 807 may be configured to obtain the time T1 when the sending device sends the first communication frame through the first communication frame.
[0094] In a possible implementation manner, the above crystal oscillator frequency correction device further includes:
[0095] The second determining module 808 may be configured to determine the frequency difference between the receiving device and the sending device according to the time T1, the time T2, the time T5, and the time T6.
[0096] In a possible implementation manner, the above crystal oscillator frequency correction device further includes:
[0097] The third determining module 809 may be configured to determine the frequency difference between the receiving device and the sending device according to the time T2, the time T3, the time T4, and the time T5.
[0098] Picture 10 It is a block diagram showing a device 800 for crystal oscillation frequency correction according to an exemplary embodiment. For example, the device 800 may be a mobile phone, a computer, a digital broadcasting terminal, a messaging device, a game console, a tablet device, a medical device, a fitness device, a personal digital assistant, etc.
[0099] Reference Picture 10 , The device 800 may include one or more of the following components: a processing component 802, a memory 804, a power component 806, a multimedia component 808, an audio component 810, an input/output (I/O) interface 812, a sensor component 814, and a communication component 816.
[0100] The processing component 802 generally controls the overall operations of the device 800, such as operations associated with display, telephone calls, data communications, camera operations, and recording operations. The processing component 802 may include one or more processors 820 to execute instructions to complete all or part of the steps of the foregoing method. In addition, the processing component 802 may include one or more modules to facilitate the interaction between the processing component 802 and other components. For example, the processing component 802 may include a multimedia module to facilitate the interaction between the multimedia component 808 and the processing component 802.
[0101] The memory 804 is configured to store various types of data to support operations in the device 800. Examples of such data include instructions for any application or method operating on the device 800, contact data, phone book data, messages, pictures, videos, etc. The memory 804 can be implemented by any type of volatile or nonvolatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable Programmable read only memory (EPROM), programmable read only memory (PROM), read only memory (ROM), magnetic memory, flash memory, magnetic or optical disk.
[0102] The power supply component 806 provides power for various components of the device 800. The power supply component 806 may include a power management system, one or more power supplies, and other components associated with the generation, management, and distribution of power for the device 800.
[0103] The multimedia component 808 includes a screen that provides an output interface between the device 800 and the user. In some embodiments, the screen may include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive input signals from the user. The touch panel includes one or more touch sensors to sense touch, sliding, and gestures on the touch panel. The touch sensor may not only sense the boundary of the touch or slide action, but also detect the duration and pressure related to the touch or slide operation. In some embodiments, the multimedia component 808 includes a front camera and/or a rear camera. When the device 800 is in an operation mode, such as a shooting mode or a video mode, the front camera and/or the rear camera can receive external multimedia data. Each front camera and rear camera can be a fixed optical lens system or have focal length and optical zoom capabilities.
[0104] The audio component 810 is configured to output and/or input audio signals. For example, the audio component 810 includes a microphone (MIC), and when the device 800 is in an operation mode, such as a call mode, a recording mode, and a voice recognition mode, the microphone is configured to receive external audio signals. The received audio signal may be further stored in the memory 804 or transmitted via the communication component 816. In some embodiments, the audio component 810 further includes a speaker for outputting audio signals.
[0105] The I/O interface 812 provides an interface between the processing component 802 and a peripheral interface module. The peripheral interface module may be a keyboard, a click wheel, a button, and the like. These buttons may include but are not limited to: home button, volume button, start button, and lock button.
[0106] The sensor component 814 includes one or more sensors for providing the device 800 with various aspects of status assessment. For example, the sensor component 814 can detect the on/off status of the device 800 and the relative positioning of the components. For example, the component is the display and the keypad of the device 800. The sensor component 814 can also detect the position change of the device 800 or a component of the device 800. , The presence or absence of contact between the user and the device 800, the orientation or acceleration/deceleration of the device 800, and the temperature change of the device 800. The sensor component 814 may include a proximity sensor configured to detect the presence of nearby objects when there is no physical contact. The sensor component 814 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor component 814 may also include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor or a temperature sensor.
[0107] The communication component 816 is configured to facilitate wired or wireless communication between the device 800 and other devices. The device 800 can access a wireless network based on a communication standard, such as WiFi, 2G or 3G, or a combination thereof. In an exemplary embodiment, the communication component 816 receives a broadcast signal or broadcast related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 816 further includes a near field communication (NFC) module to facilitate short-range communication. For example, the NFC module can be implemented based on radio frequency identification (RFID) technology, infrared data association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology and other technologies.
[0108] In an exemplary embodiment, the apparatus 800 may be implemented by one or more application specific integrated circuits (ASIC), digital signal processors (DSP), digital signal processing equipment (DSPD), programmable logic devices (PLD), field programmable A gate array (FPGA), controller, microcontroller, microprocessor, or other electronic components are implemented to implement the above methods.
[0109] In an exemplary embodiment, there is also provided a non-volatile computer-readable storage medium, such as a memory 804 including computer program instructions, which can be executed by the processor 820 of the device 800 to implement the foregoing method.
[0110] Picture 11 It is a block diagram of an apparatus 1900 for a method for correcting a crystal oscillation frequency according to an exemplary embodiment. For example, the device 1900 may be provided as a server. Reference Picture 11 The device 1900 includes a processing component 1922, which further includes one or more processors, and a memory resource represented by the memory 1932, for storing instructions that can be executed by the processing component 1922, such as application programs. The application program stored in the memory 1932 may include one or more modules each corresponding to a set of instructions. In addition, the processing component 1922 is configured to execute instructions to perform the above-described method.
[0111] The device 1900 may also include a power supply component 1926 configured to perform power management of the device 1900, a wired or wireless network interface 1950 configured to connect the device 1900 to a network, and an input output (I/O) interface 1958. The device 1900 can operate based on an operating system stored in the memory 1932, such as Windows ServerTM, MacOS XTM, UnixTM, LinuxTM, FreeBSDTM or the like.
[0112] In an exemplary embodiment, a non-volatile computer-readable storage medium is also provided, such as the memory 1932 including computer program instructions, which can be executed by the processing component 1922 of the device 1900 to complete the foregoing method.
