A distance measuring intercom and distance measuring method thereof

Abstract

The present invention relates to the technical field of wireless communication equipment, and more specifically, to a distance measuring interphone and a distance measuring method. The present invention includes an antenna port, a radio frequency transceiver circuit assembly, a BDS&GPS dual-mode antenna, a dual-mode navigation and positioning module, a microprocessor unit, an audio processing circuit assembly, a microphone, a speaker, a power supply unit, a display unit, and a key unit. The distance measuring interphone can obtain the distance and azimuth information of the other party during a call according to different application scenarios, detect the distance and azimuth information of the other party according to the contact list, detect the distance and azimuth information of the other party by manual dialing, and detect the distance and azimuth information of the other party under the distance measuring channel. Further, the distance measuring interphone can support the Beidou satellite navigation system and the GPS navigation system.

Description

Technical Field

[0001] The present invention relates to the technical field of wireless communication equipment, and in particular to a distance measuring interphone and a distance measuring method thereof. Background Art

[0002] Nowadays, walkie-talkies are widely used in team activities, such as caravans, mountaineering teams, tourism, expeditions, etc. Conventional walkie-talkies solve communication problems, but a problem often arises in team activities: where are my teammates?

[0003] In view of this, the applicant conducted in-depth research on walkie-talkies and invented a walkie-talkie with a distance measurement function, which led to the present case. Summary of the invention

[0004] The object of the present invention is to provide a distance measuring interphone and a distance measuring method thereof, which can obtain the mutual distance and direction information between two interphones.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] A distance measuring intercom, whose host circuit comprises an antenna port, a radio frequency transceiver circuit assembly, a microprocessor unit, an audio processing circuit assembly, a microphone, a loudspeaker, a power supply unit, a display unit and a key unit; the power supply unit provides working power for the entire intercom, the microphone is connected to the audio input end of the audio processing circuit assembly, the loudspeaker is connected to the audio output end of the audio processing circuit assembly, the display unit is connected to the display output end of the microprocessor unit, the key unit is connected to the key input end of the microprocessor unit, the audio processing circuit assembly and the radio frequency transceiver circuit assembly are bidirectionally connected to the microprocessor unit respectively, and the antenna port is connected to the antenna connection end of the radio frequency transceiver circuit assembly; the radio frequency transceiver circuit assembly adopts a radio frequency transceiver circuit assembly based on a 4FSK modulation mode, and also comprises a BDS&GPS dual-mode antenna, and a dual-mode navigation and positioning module supporting Beidou and GPS, the dual-mode navigation and positioning module is connected to the data receiving end of the microprocessor unit, and the BDS&GPS dual-mode antenna is connected to the antenna connection end of the dual-mode navigation and positioning module.

[0007] The BDS&GPS dual-mode antenna adopts a dual-band antenna that can support both the Beidou satellite navigation system and the GPS navigation system.

[0008] A distance measuring method for a distance measuring interphone, wherein the distance measuring interphone sends a short message requesting distance measurement to the measured interphone through a short message protocol, and the measured interphone returns its own positioning information to the distance measuring interphone after receiving the short message, and the distance measuring interphone calculates the distance and direction between the two interphones.

[0009] The distance measurement method is specifically implemented by the following steps:

[0010] S1: According to different application scenarios, the ranging function is divided into: obtaining the distance and direction information of the other party during the call, regularly detecting the distance and direction information of the other party according to the contact list, regularly detecting the distance and direction information of the other party by manual dialing, and regularly detecting the distance and direction information of the other party under the ranging channel; when in use, the intercom of the ranging party enters the menu setting through the key unit, and sets the ID information, CC code information and time slot information of the intercom of the measured party according to the corresponding application scenario;

[0011] S2: The intercom of the distance measuring party fills the SMS content requesting distance measurement into the SMS data sending buffer and sends it out according to the current settings, and waits for the response of the intercom of the measured party;

[0012] S3: After receiving and analyzing the data, the intercom of the measured party determines whether it belongs to the ranging information. If so, it sends its current positioning information back to the intercom of the ranging party in the set ranging reply format;

[0013] S4: After the intercom of the distance measuring party successfully receives the positioning information and parses the latitude and longitude information of the intercom of the measured party contained therein, it calculates the latitude and longitude information with its own positioning information and calculates the distance between the two parties according to the formula AB=R·arccos[cosβ1cosβ2cos(α1-α2)+sinβ1sinβ2];

[0014] Wherein, AB represents the distance between the two measuring parties, R is the average radius of the earth; α1 is the longitude value of the measuring party's intercom, β1 is the latitude value of the measuring party's intercom, α2 is the longitude value of the measured party's intercom, β2 is the latitude value of the measured party's intercom, where, based on the 0 degree longitude, east longitude is positive, west longitude is negative, north latitude is positive, and south latitude is negative;

[0015] S5: Determine the position of the distance measuring party's intercom within the unit circle with the measured party's intercom as the origin through the longitude and latitude information of both parties, so that the distance between the two parties and the direction of the measured party's intercom relative to the distance measuring party's intercom are obtained;

[0016] S6: If the distance measurement is successful, a unit circle is displayed on the display unit of the intercom of the distance measuring party, that is, in the plane rectangular coordinate system, the center of the circle is the origin, which is the distance measuring party, and the radius is the unit length, which is the distance between the two parties, and a point is displayed at the corresponding position according to the calculated angle;

[0017] S7: If the distance measurement fails, the corresponding failure reason is displayed on the display unit of the intercom of the distance measurement party.

[0018] The ranging failure in step S7 includes the following two situations:

[0019] When the intercom of the measured party receives the SMS message from the intercom of the distance measuring party requesting distance measurement, if the intercom of the measured party has not turned on GPS, the information that GPS is not turned on will be fed back to the intercom of the distance measuring party. After receiving this information, the distance measuring party that has not turned on GPS will display on its display unit that the other party has not turned on GPS.

[0020] When the intercom of the measured party receives a text message from the intercom of the ranging party requesting ranging, if the intercom of the measured party has not yet been located, it will feed back the information that it has not yet been located to the intercom of the ranging party. After receiving this information, the intercom of the ranging party will display on its display unit that the other party has no GPS positioning.

[0021] After adopting the above scheme, the distance measuring intercom of the present invention, when working, the intercom of the distance measuring party sends a short message requesting distance measurement to the intercom of the measured party through the short message protocol in its microprocessor unit through its radio frequency transceiver circuit assembly and antenna port. After the intercom of the measured party receives the short message through its antenna port and radio frequency transceiver circuit assembly, the short message is sent to the microprocessor unit of the intercom of the measured party. After the microprocessor unit of the intercom of the measured party receives the short message and parses its content, it sends its own GPS positioning information (through its BDS & GPS The dual-mode antenna and the dual-mode navigation and positioning module obtain the GPS positioning information, which is sent to the intercom of the ranging party through its RF transceiver circuit assembly and antenna port. The intercom of the ranging party receives the GPS positioning information of the intercom of the measured party through its antenna port and RF transceiver circuit assembly, and sends the GPS positioning information to the microprocessor unit of the intercom of the ranging party. The distance and direction between the two intercoms are calculated and analyzed by the microprocessor unit of the intercom of the ranging party, and the distance and direction between the two intercoms are displayed on the display unit of the intercom of the ranging party. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a block diagram of the whole circuit principle of the present invention;

[0023] Figure 2 It is a display schematic diagram of the distance measurement function in the present invention;

[0024] Figure 3 This is a control flow chart of the ranging function in the present invention. DETAILED DESCRIPTION

[0025] A distance measuring intercom of the present invention, such as Figure 1As shown, the host circuit includes an antenna port 1, a radio frequency transceiver circuit assembly 2, a BDS&GPS dual-mode antenna 3, a dual-mode navigation and positioning module 4, a microprocessor unit 5, an audio processing circuit assembly 6, a microphone 7, a speaker 8, a power supply unit 9, a display unit 10 and a key unit 11. All of the above parts use circuit elements or modules that are commonly known in the industry. Among them:

[0026] The power supply unit 9 provides the working power for the entire intercom, the microphone 7 is connected to the audio input end of the audio processing circuit assembly 6, the speaker 8 is connected to the audio output end of the audio processing circuit assembly 6, the display unit 10 is connected to the display output end of the microprocessor unit 5, the key unit 11 is connected to the key input end of the microprocessor unit 5, the audio processing circuit assembly 6 and the radio frequency transceiver circuit assembly 2 are respectively bidirectionally connected to the microprocessor unit 5, the antenna port 1 is connected to the antenna connection end of the radio frequency transceiver circuit assembly 2, the dual-mode navigation and positioning module 4 is connected to the data receiving end of the microprocessor unit 5, and the BDS&GPS dual-mode antenna 3 is connected to the antenna connection end of the dual-mode navigation and positioning module 4.

[0027] In the present invention, the microprocessor unit 5 adopts an MCU chip of model GD32F303VGT6, which has powerful computing performance and rich peripheral interfaces, with a maximum main frequency of 120MHz and supports DSP instruction operations, and the core accesses the flash memory at high speed and zero waiting. Among them, the I2C interface of the chip supports the fast Plus (Fm+) mode, with a frequency of up to 1MHz (1MB / s), which is twice the previous speed, so as to adapt to high-bandwidth applications with a higher data transmission rate. The SPI interface also supports four-wire system, which is convenient for expanding Quad SPI NOR Flash and realizing high-speed access.

[0028] In the present invention, the walkie-talkie involved is a digital walkie-talkie based on the 4FSK modulation method, and its radio frequency transceiver circuit assembly 2 adopts a radio frequency transceiver circuit assembly based on the 4FSK modulation method, for example, DMR or DPMR digital format can be used for sending and receiving.

[0029] This embodiment is described by taking the DMR format as an example. The DMR short message protocol supports data transmission in the short message format between walkie-talkies.

[0030] The dual-mode navigation and positioning module 4 in the present invention adopts a dual-mode navigation and positioning module that supports Beidou and GPS, and has the advantages of high tracking, high capture sensitivity, high positioning accuracy, low power consumption and low cost.

[0031] The BDS&GPS dual-mode antenna 3 of the present invention adopts a dual-band antenna, which can support both the Beidou satellite navigation system and the GPS navigation system.

[0032] like Figure 2 As shown, the display unit 10 is used to provide distance and azimuth information display for the ranging function. Specifically, information C represents the azimuth information of the measured party's intercom in the form of an azimuth map, information D represents the ID information of the measured party's intercom, and information E represents the relative azimuth and distance information between the distance measuring party's intercom and the measured party's intercom.

[0033] In the present invention, the basic communication framework of the walkie-talkie including the antenna port 1, the RF transceiver circuit assembly 2, the microprocessor unit 5, the audio processing circuit assembly 6, the microphone 7, the speaker 8, the power supply unit 9, the display unit 10, and the button unit 11 is a well-known technology in the art and will not be elaborated in detail here.

[0034] The main innovation of the present invention lies in the ranging function. When working, the intercom of the ranging party sends a short message requesting ranging to the intercom of the measured party through the DMR short message protocol in its microprocessor unit 5 through its radio frequency transceiver circuit assembly and antenna port. After the intercom of the measured party receives the short message through its antenna port and radio frequency transceiver circuit assembly, the short message is sent to the microprocessor unit of the intercom of the measured party. After the microprocessor unit of the intercom of the measured party receives the short message and parses its content, it sends its own GPS positioning information (through its BDS&GP The GPS positioning information is obtained by using the S dual-mode antenna and the dual-mode navigation and positioning module, and is sent to the intercom of the ranging party through its RF transceiver circuit assembly and the antenna port. The intercom of the ranging party receives the GPS positioning information of the intercom of the measured party through its antenna port and the RF transceiver circuit assembly, and sends the GPS positioning information to the microprocessor unit of the intercom of the ranging party. The distance and direction between the two intercoms are calculated and analyzed by the microprocessor unit of the intercom of the ranging party, and the distance and direction between the two intercoms are displayed on the display unit of the intercom of the ranging party.

[0035] In the present invention, Figure 3 As shown, the ranging method of the ranging walkie-talkie is specifically implemented through the following steps:

[0036] S1: According to different application scenarios, the ranging function is divided into: obtaining the distance and direction information of the other party during the call, regularly detecting the distance and direction information of the other party according to the contact list, regularly detecting the distance and direction information of the other party by manual dialing, and regularly detecting the distance and direction information of the other party under the ranging channel; when in use, the intercom of the ranging party enters the menu setting through the key unit 11, and sets the ID information, CC code information and time slot information of the intercom of the measured party according to the corresponding application scenario (obtaining the distance and direction information of the other party during the call, regularly detecting the distance and direction information of the other party according to the contact list, regularly detecting the distance and direction information of the other party by manual dialing, or regularly detecting the distance and direction information of the other party under the ranging channel);

[0037] S2: The intercom of the distance measuring party fills the short message content (the short message content is fixed, which is the latitude and longitude part of the RMV format positioning information received by the intercom of the distance measuring party from the dual-mode navigation and positioning module 4 plus the reply header string: QX CMD 004) of the short message requesting distance measurement into the DMR short message data sending buffer through the key unit 11, sends it out according to the current settings, and waits for the response of the intercom of the measured party;

[0038] S3: After receiving and analyzing the data, the intercom of the measured party determines whether it belongs to the ranging information. If so, it sends its current positioning information (the intercom of the measured party will reply with default information when positioning fails) back to the intercom of the ranging party in the set ranging reply format; wherein, the set ranging reply format can be specifically adopted as: reply header string QX CMD004+latitude+longitude;

[0039] S4: After the intercom of the distance measuring party successfully receives the positioning information and parses the latitude and longitude information of the intercom of the measured party contained therein, it calculates the latitude and longitude information with its own positioning information and calculates the distance between the two parties according to the formula AB=R·arccos[cosβ1cosβ2cos(α1-α2)+sinβ1sinβ2];

[0040] Wherein, AB is the distance between the two measuring parties, R is the average radius of the earth; α1 is the longitude value of the measuring party's intercom, β1 is the latitude value of the measuring party's intercom, α2 is the longitude value of the measured party's intercom, β2 is the latitude value of the measured party's intercom, where, based on the 0 degree longitude, east longitude is positive, west longitude is negative, north latitude is positive, and south latitude is negative;

[0041] S5: Determine the position of the measuring party's intercom within the unit circle with the measured party's intercom as the origin through the longitude and latitude information of both parties (for example, when the measured party's intercom is located to the south of the measuring party's intercom, its ordinate is negative), so that the distance between the two parties and the direction of the measured party's intercom relative to the measuring party's intercom are obtained;

[0042] S6: If the distance measurement is successful, a unit circle is displayed on the display unit of the intercom of the distance measuring party, that is, in the plane rectangular coordinate system, the center of the circle is the origin, which is the distance measuring party, and the radius is the unit length, which is the distance between the two parties, and a point is displayed at the corresponding position according to the calculated angle;

[0043] S7: If the distance measurement fails, the corresponding failure reason is displayed on the display unit of the intercom of the distance measurement party.

[0044] The ranging failure in step S7 includes the following two situations:

[0045] When the intercom of the measured party receives the SMS message from the intercom of the distance measuring party requesting distance measurement, if the intercom of the measured party has not turned on GPS, the information that GPS is not turned on will be fed back to the intercom of the distance measuring party. After receiving this information, the distance measuring party that has not turned on GPS will display on its display unit that the other party has not turned on GPS.

[0046] When the intercom of the measured party receives a text message from the intercom of the ranging party requesting ranging, if the intercom of the measured party has not yet been located, it will feed back the information that it has not yet been located to the intercom of the ranging party. After receiving this information, the intercom of the ranging party will display on its display unit that the other party has no GPS positioning.

[0047] The above embodiments of the present invention are merely examples for clearly explaining the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other structural changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. However, these obvious changes or modifications derived from the spirit of the present invention are still within the scope of protection of the present invention.

Claims

1. A distance measuring intercom, whose host circuit includes an antenna port, a radio frequency transceiver circuit assembly, a microprocessor unit, an audio processing circuit assembly, a microphone, a speaker, a power supply unit, a display unit and a key unit; the power supply unit provides working power for the entire intercom, the microphone is connected to the audio input end of the audio processing circuit assembly, the speaker is connected to the audio output end of the audio processing circuit assembly, the display unit is connected to the display output end of the microprocessor unit, the key unit is connected to the key input end of the microprocessor unit, the audio processing circuit assembly and the radio frequency transceiver circuit assembly are bidirectionally connected to the microprocessor unit respectively, and the antenna port is connected to the antenna connection end of the radio frequency transceiver circuit assembly; it is characterized in that: The radio frequency transceiver circuit assembly adopts a radio frequency transceiver circuit assembly based on a 4FSK modulation mode, and also includes a BDS&GPS dual-mode antenna, and a dual-mode navigation and positioning module supporting Beidou and GPS, the dual-mode navigation and positioning module is connected to the data receiving end of the microprocessor unit, and the BDS&GPS dual-mode antenna is connected to the antenna connection end of the dual-mode navigation and positioning module; The distance measuring method of the distance measuring intercom is as follows: the distance measuring intercom sends a short message requesting distance measurement to the measured intercom through the short message protocol, and the measured intercom returns its own positioning information to the distance measuring intercom after receiving the short message, and the distance measuring intercom calculates the distance and direction between the two intercoms; The distance measurement method is specifically implemented by the following steps: S1: According to different application scenarios, the ranging function is divided into: obtaining the distance and direction information of the other party during the call, regularly detecting the distance and direction information of the other party according to the contact list, regularly detecting the distance and direction information of the other party by manual dialing, and regularly detecting the distance and direction information of the other party under the ranging channel; when in use, the intercom of the ranging party enters the menu setting through the key unit, and sets the ID information, CC code information and time slot information of the intercom of the measured party according to the corresponding application scenario; S2: The intercom of the distance measuring party fills the SMS content requesting distance measurement into the SMS data sending buffer and sends it out according to the current settings, and waits for the response of the intercom of the measured party; S3: After receiving and analyzing the data, the intercom of the measured party determines whether it belongs to the ranging information. If so, it sends its current positioning information back to the intercom of the ranging party in the set ranging reply format; S4: After the intercom of the distance measuring party successfully receives the positioning information, it parses the latitude and longitude information of the intercom of the measured party contained therein, and calculates it with its own positioning information, and calculates the distance between the two parties according to the formula AB = R•arccos[cosβ1cosβ2cos(α1-α2)+sinβ1sinβ2]; Wherein, AB represents the distance between the two measuring parties, R is the average radius of the earth; α1 is the longitude value of the measuring party's intercom, β1 is the latitude value of the measuring party's intercom, α2 is the longitude value of the measured party's intercom, β2 is the latitude value of the measured party's intercom, where, based on the 0 degree longitude, east longitude is positive, west longitude is negative, north latitude is positive, and south latitude is negative; S5: Determine the position of the distance measuring party's intercom within the unit circle with the measured party's intercom as the origin through the longitude and latitude information of both parties, so that the distance between the two parties and the direction of the measured party's intercom relative to the distance measuring party's intercom are obtained; S6: If the distance measurement is successful, a unit circle is displayed on the display unit of the intercom of the distance measuring party, that is, in the plane rectangular coordinate system, the center of the circle is the origin, which is the distance measuring party, and the radius is the unit length, which is the distance between the two parties, and a point is displayed at the corresponding position according to the calculated angle; S7: If the distance measurement fails, the corresponding failure reason is displayed on the display unit of the intercom of the distance measurement party.

2. A distance measuring intercom according to claim 1, characterized in that: The BDS&GPS dual-mode antenna adopts a dual-band antenna that can support both the Beidou satellite navigation system and the GPS navigation system.

3. A distance measuring intercom according to claim 1, characterized in that: The ranging failure in step S7 includes the following two situations: When the intercom of the measured party receives the SMS message from the intercom of the distance measuring party requesting distance measurement, if the intercom of the measured party has not turned on GPS, the information that GPS is not turned on will be fed back to the intercom of the distance measuring party. After receiving this information, the distance measuring party that has not turned on GPS will display on its display unit that the other party has not turned on GPS. When the intercom of the measured party receives a text message from the intercom of the ranging party requesting ranging, if the intercom of the measured party has not yet been located, it will feed back the information that it has not yet been located to the intercom of the ranging party. After receiving this information, the intercom of the ranging party will display on its display unit that the other party has no GPS positioning.

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