TWI422853B - Speed-measuring system and method thereof - Google Patents

Description

Speed measuring system and speed measuring method thereof

The invention relates to a speed measuring technology, in particular to a speed measuring system and a speed measuring method thereof.

At present, the speed measurement method for vehicles on the market generally uses the Global Positioning System (GPS) for positioning, and then calculates the speed of the vehicle. This speed is calculated by the speed of satellite positioning. If GPS is incorporated into a mobile communication terminal such as a mobile phone to calculate the speed, the cost of manufacturing the mobile phone and the size of the mobile phone may be increased.

In view of this, it is necessary to provide a low-cost and small-volume speed measuring system and a speed measuring method thereof.

A speed measuring system for measuring a moving speed of a mobile communication terminal having a global mobile communication system function from a first location to a second location relative to a base station. The base station has at least one antenna and a signal tower. The center line of the signal tower is perpendicular to the antenna, and the center line of the signal tower has an intersection with the antenna. The speed measuring system comprises an angle detecting unit, a distance detecting unit, a moving speed calculating unit, a time detecting unit and a display unit. The angle detecting unit is located in the base station, and is configured to detect an angle between a signal source of the mobile communication terminal and an antenna of the base station. The distance detecting unit and the moving speed calculating unit The time detecting unit and the display unit are both located in the mobile communication terminal. The distance detecting unit is configured to detect a distance between the mobile communication terminal and the intersection. The time detecting unit is configured to detect a time required for the mobile communication terminal to move from the first location to the second location. The moving speed calculation unit calculates the moving speed of the mobile communication terminal according to the angle detected by the angle detecting unit, the distance detected by the distance detecting unit, and the time detected by the time detecting unit, and The display unit displays the value of the moving speed.

A speed measuring method for measuring a moving speed of a mobile communication terminal having a global mobile communication system function from a first location to a second location relative to a base station. The base station has an antenna and a signal tower. The center line of the signal tower is perpendicular to the antenna, and the center line of the signal tower has an intersection with the antenna. The speed measurement method includes the following steps: detecting a first angle between a signal source of the mobile communication terminal at the first location and an antenna of the base station station, and detecting the intersection of the mobile communication terminal at the first location a first distance; detecting a second angle between a signal source of the mobile communication terminal at the second location and an antenna of the base station, and detecting the mobile communication terminal at the second location and the intersection a distance and a time required for the mobile communication terminal to move from the first location to the second location; calculating the first angle, the second angle, the first distance, the second distance, and the time a moving speed of the mobile communication terminal moving from the first location to the second location; and displaying the value of the moving speed.

Compared with the prior art, the speed measuring system and the speed measuring method thereof, by detecting an angle between a signal source of the mobile communication terminal and the antenna, a distance between the mobile communication terminal and the intersection, and the mobile communication terminal from the The time required for the first location to move to the second location calculates the moving speed of the mobile communication terminal, and does not need to add GPS to the mobile communication terminal, which is low in cost and small in size.

100‧‧‧Speed measuring system

200‧‧‧Mobile communication terminal

300‧‧‧ base station

10‧‧‧ Angle detection unit

20‧‧‧Distance detection unit

30‧‧‧Mobile speed calculation unit

40‧‧‧Time detection unit

50‧‧‧ display unit

V‧‧‧ moving speed

t‧‧‧Time

EP, Ea, Eb‧‧‧ distance

θP, θa, θb‧‧‧ angle

P‧‧‧any place

A‧‧‧first place

b‧‧‧Second place

60‧‧‧ Signal Tower

61‧‧‧ center line

63‧‧‧ intersection

70‧‧‧Antenna

FIG. 1 is a schematic structural diagram of a speed measuring system according to an embodiment of the present invention.

2 is a schematic diagram of the speed calculation of the speed measuring system of FIG. 1.

FIG. 3 is a flowchart of a method for measuring speed according to an embodiment of the present invention.

The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

Referring to FIG. 1 and FIG. 2 together, a speed measurement system 100 for measuring a Global System For Mobile Communication (GSM) function of a mobile communication terminal 200 relative to a base station station 300 is provided. The moving speed from the first location a to the second location b.

The speed measuring system 100 includes an angle detecting unit 10, a distance detecting unit 20, a moving speed calculating unit 30, a time detecting unit 40, and a display unit 50. The angle detecting unit 10 is located in the base station 300. The distance detecting unit 20, the moving speed calculating unit 30, the time detecting unit 40, and the display unit 50 are all located in the mobile communication terminal 200. The base station 300 has an antenna 70 and a signal tower 60. Of course, the base station 300 can have multiple sets of antennas 70. However, one of the antennas 70 must be fixedly used with respect to the same mobile communication terminal 200. That is, each time the mobile communication terminal 200 communicates with the base station station 300, the same antenna 70 is used. . The signal tower 60 has a centerline 61 that is perpendicular to the ground. The centerline 61 is perpendicular to the antenna 70, and the antenna 70 has an intersection 63 with the centerline 61.

The angle detecting unit 10 is configured to detect an angle θ _P between the signal source of the mobile communication terminal 200 and the antenna 70 of the base station 300 when the mobile communication terminal 200 is at any one location P. In the present embodiment, the location P is also the first location a at the same time. The angle θ _P is an angle between the antenna 70 and the source of the signal of the mobile communication terminal 200. Of course, the antenna 70 may be clockwise to the angle between the signal sources of the mobile communication terminal 200.

The distance detecting unit 20 is configured to detect the distance E _{P of} the mobile communication terminal 200 from the intersection 63 when the mobile communication terminal 200 is in the P location. The distance detecting unit 20 is pre-set with a formula for calculating the distance E _P between the mobile communication terminal 200 and the intersection 63:

The TA _P is a time advance (TA) in the Access Grant Channel (AGCH) field sent by the base station 300 at the P site; C is the speed of light.

Further, when the mobile communication terminal 200 has the GSM function, the TA exists in the AGCH field sent by the base station 300 to the mobile communication terminal 200, and the TA is composed of 6 bits, so that The TA value is between 0-63 and the 1TA value is 3.69 microseconds (μs). Therefore, the distance E _{P of} the mobile communication terminal 200 from the intersection 63 can be calculated using the TA value.

The time detecting unit 40 is configured to detect that the mobile communication terminal 200 moves from the first location a The time t required to move to the second location b.

The moving speed calculation unit 30 is configured to calculate the mobile communication according to the angle θ _P detected by the angle detecting unit 10, the distance E _P detected by the distance detecting unit 20, and the time t detected by the time detecting unit 40. The moving speed of the terminal 200 is displayed by the display unit 50 as the value of the moving speed. The calculation formula of the moving speed is preset in the moving speed calculation unit 30:

Wherein, V is the moving speed; E _a is the distance between the mobile communication terminal 200 and the intersection 63 at the first location a; E _b is the distance between the mobile communication terminal 200 and the intersection 63 at the second location b; θ _a is the angle between the signal source of the mobile communication terminal 200 and the antenna 70 of the base station 300 when the mobile communication terminal 200 is at the first location a; θ _b is the mobile communication terminal when the mobile communication terminal 200 is at the second location b The angle between the source of the signal 200 and the antenna 70 of the base station 300.

Finally, the value of the moving speed is displayed by the display unit 50.

In summary, the speed measurement system 100 can calculate the moving speed of the mobile communication terminal 200 relative to the base station 300 from the first location a to the second location b. It can be understood that the moving speed is the average speed within the time t and cannot reflect the instantaneous moving speed. Therefore, when it is necessary to reflect the instantaneous moving speed of the mobile communication terminal 200, the mobile communication terminal 200 must be made at this time. t shows the movement speed once, so users can understand their movement speed at any time. The smaller the value of the time t is, the smaller the error of the moving speed obtained by the mobile communication terminal 200 is. Therefore, if the user is driving on the highway, the mobile communication terminal 200 (such as a mobile phone) is only required to be placed in the pocket, and the vibration speed is used to remind the driving speed whether the driving speed is too high, so that the user can concentrate on driving without time. Pay attention to the speedometer. The speed measuring system 100 is based on the angle θ _P between the signal source of the mobile communication terminal 200 and the antenna 70 of the base station 300, the distance E _P between the mobile communication terminal 200 and the intersection 63, and the mobile communication terminal 200. The moving speed of the mobile communication terminal 200 is calculated from the time t required to move from the first location a to the second location b, and there is no need to add GPS to the mobile communication terminal 200, which is low in cost and small in size.

Referring to FIG. 3, a speed measuring method according to an embodiment of the present invention is applied to the speed measuring system 100, and the method includes the following steps: Step S10: detecting a signal of the mobile communication terminal 200 at the first location a The first angle θ _a between the source and the antenna 70 of the base station 300 and the first distance E _{a of} the mobile communication terminal 200 at the first location a and the intersection 63 are detected; in step S20, the movement is detected. The second angle θ _b between the signal source of the communication terminal 200 at the second location b and the antenna 70 of the base station 300, and the detection of the mobile communication terminal 200 at the second location b and the intersection 63 a distance E _b and a time t required to detect that the mobile communication terminal 200 moves from the first location a to the second location b; and in step S30, according to the first angle θ _a , the second angle θ _b , The first distance E _a , the second distance E _b and the time t calculate a moving speed of the mobile communication terminal 200 moving from the first location a to the second location b; and in step S40, the value of the moving speed is displayed.

In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. please. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application of the present invention. Equivalent modifications or variations made by persons skilled in the art in light of the spirit of the invention are intended to be included within the scope of the following claims.

100‧‧‧Speed measuring system

200‧‧‧Mobile communication terminal

300‧‧‧ base station

10‧‧‧ Angle detection unit

20‧‧‧Distance detection unit

30‧‧‧Mobile speed calculation unit

40‧‧‧Time detection unit

50‧‧‧ display unit

V‧‧‧ moving speed

t‧‧‧Time

EP‧‧‧ distance

θP‧‧‧ angle

Claims (6)

A speed measuring system for measuring a moving speed of a mobile communication terminal having a global mobile communication system function from a first location to a second location, the base station having at least one antenna and a signal tower, the signal tower The center line is perpendicular to the antenna, and the center line of the signal tower has an intersection with the antenna. The improvement is that the speed measurement system includes an angle detecting unit, a distance detecting unit, a moving speed calculating unit, and a time. a detecting unit and a display unit, the angle detecting unit is located in the base station, and is configured to detect an angle between a signal source of the first location of the mobile communication terminal and an antenna of the base station, and the mobile communication terminal The angle between the source of the signal at the second location and the antenna of the base station, the distance detecting unit, the moving speed calculating unit, the time detecting unit, and the display unit are both located in the mobile communication terminal, the distance The detecting unit is configured to detect a distance from the intersection of the mobile communication terminal at the first location and the mobile communication terminal The distance detecting unit is configured to detect a time required for the mobile communication terminal to move from the first location to the second location, and the moving speed calculation unit detects the angle according to the angle Calculating the moving speed of the mobile communication terminal by the two angles detected by the unit, the two distances detected by the distance detecting unit, and the time detected by the time detecting unit, and displaying the moving speed by the display unit The value. The speed measurement system of claim 1, wherein the calculation formula of the movement speed is pre-set in the movement speed calculation unit: Wherein, V is the moving speed; E _a is the distance between the mobile communication terminal and the intersection at the first location; E _b is the distance between the mobile communication terminal and the intersection at the second location; θ _a is the angle between the signal source of the mobile communication terminal and the antenna of the base station when the mobile communication terminal is at the first location; θ _{b is} the mobile communication terminal when the mobile communication terminal is at the second location The angle between the source of the signal and the antenna of the base station; t is the time required for the mobile communication terminal to move from the first location to the second location. The speed measuring system of claim 1, wherein the distance detecting unit is pre-set with a formula for calculating a distance between the mobile communication terminal and the intersection: Where E _{P is} the distance; TA _{P is} the amount of time advancement in the access allowed channel field sent by the base station at a location; C is the speed of light. A speed measuring method for measuring a moving speed of a mobile communication terminal having a global mobile communication system function from a first location to a second location with respect to an base station, the base station having an antenna and a signal tower, the signal tower The center line is perpendicular to the antenna, and the center line of the signal tower has an intersection with the antenna. The improvement method comprises the following steps: detecting a signal source of the mobile communication terminal at the first location and the base station a first angle between the antennas of the station and detecting a first distance from the intersection of the mobile communication terminal at the first location; detecting a signal source of the mobile communication terminal at the second location and the base station a second angle between the antennas, detecting a second distance from the intersection of the mobile communication terminal at the second location, and detecting a time required for the mobile communication terminal to move from the first location to the second location; Calculating according to the first angle, the second angle, the first distance, the second distance, and the time a moving speed of the mobile communication terminal moving from the first location to the second location; and displaying a value of the moving speed. The speed measuring method according to claim 4, wherein the moving speed satisfies the following formula: Where V is the moving speed; E _{a is} the first distance; E _{b is} the second distance; θ _{a is} the first angle; θ _{b is} the second angle; t is the time. The speed measuring method according to claim 4, wherein the distance between the mobile communication terminal and the intersection point satisfies the following formula: Where E _{P is} the distance; TA _{P is} the amount of time advancement in the access allowed channel field sent by the base station at a location; C is the speed of light.