Electronic tag

[0020] Example 1

[0021] figure 2 It is a schematic structural diagram of an embodiment of the electronic label provided by the present invention. like figure 2 As shown, the electronic tag of the embodiment of the present invention may specifically include a chip 1 and an antenna, and the antenna is a directional antenna 21 .

[0022] The directional antenna 21 is a type of antenna that transmits and receives microwaves in one or several specific directions with particularly strong strength, while transmitting and receiving microwaves in other directions is zero or extremely small. The chip 1 receives the microwave signal through the directional antenna 21 , and transmits the electronic code stored in the chip 1 through the directional antenna 21 by virtue of the energy obtained by the induced current.

[0023] In the field of autonomous driving, vehicle radar generally uses 77GHz ranging radar to determine the distance between the vehicle ahead and the vehicle, such as image 3 As shown, the applicable range of this radar is within 0-200m. The principle used is that the radar transmits a pulse beam, and the metal parts at the rear of the front vehicle reflect the radar wave. After the receiver of the radar receives the reflected wave, it calculates the time of transmitting the pulse wave and the reflected wave, so as to judge the distance between the vehicle and the front vehicle. the distance. In the short-range area of ​​0-5m, ultrasonic radar is generally used for ranging. 77GHz ranging radar generally uses such as Figure 4 The phased array scanning method shown, Figure 4 Each petal of a chrysanthemum in the image represents the scanning angle of the radar in 360-degree space. At the same moment, the radar antenna scans only one petal of the chrysanthemum, and scans the other petal at the next moment. Different petals represent different directions. If a signal is received at a certain moment, it can be shown that at this moment, from the direction of the petal, a signal source sends a signal, thereby determining the direction of the signal source in the radar. On electric vehicles, there is also a similar radar. Within a scanning period of the radar, the time is divided into several equal parts, such as 8 parts, which are also called time slots. Inside each time slot, the radar scans radar echoes from different directions in front of the vehicle to determine the distance to obstacles in different directions.

[0024] Figure 5 A schematic diagram of the application of electronic tags in road vehicle driving scenarios, such as Figure 5 As shown in the figure below, the electronic tag should be embedded or pasted on the lane boundary of the road during road construction. The electronic tag should be flush with the lane boundary, and the maximum radiation direction of the directional antenna in the electronic tag should point to the direction of incoming vehicles, such as Image 6 As shown in the figure, it can directionally receive the microwave signal sent by the vehicle radar, and store the energy. After the storage is completed, it sends its own electronic code to the vehicle radar through the microwave signal, and sends the microwave signal continuously until the energy storage is exhausted. The vehicle radar calculates the distance between the vehicle and the electronic tag according to the time of transmitting and receiving the microwave signal, and then determines the direction angle of the electronic tag in front of the vehicle, so as to determine whether the vehicle is in the center of the lane, so as to realize the lane keeping in automatic driving. This function keeps the vehicle in the center of the current lane all the time, preventing traffic accidents caused by changing lanes.

[0025] The electronic tag of the embodiment of the present invention can receive and transmit microwave signals directionally through the directional antenna, and is applied in the driving scene of road vehicles. The electronic code is sent to the vehicle radar, which improves the anti-interference and the effective utilization of radiated energy, and meets the requirements of road vehicles.

[0026] Embodiment 2

[0027] Figure 7 It is a schematic structural diagram of another embodiment of the electronic label provided by the present invention. like Figure 7 As shown, the electronic label of the embodiment of the present invention is figure 2 A possible implementation of the electronic tag of the embodiment shown, in figure 2 Technically in the illustrated embodiment, the directional antenna 21 may specifically be various antennas capable of directionally transmitting and receiving microwave signals, such as the array antenna 71 .

[0028] Further, in order to realize directional transmission and reception of microwave signals, the array antenna 71 may specifically include a microstrip line 72 and a plurality of radiation units 73 ( Figure 7 Here, four radiation units 73 are taken as an example), and the plurality of radiation units 73 are respectively connected to the chip 1 through microstrip lines.

[0029] Further, the array antenna 71 may be specifically located on one side of the chip 1 , that is, the microstrip line 72 and the multiple radiation units 73 connected in parallel are located on the same side of the chip 1 .

[0030] Further, the microstrip line 72 may specifically include a first microstrip line 74 arranged in a straight line and a plurality of second microstrip lines 75 vertically connected to the first microstrip line 74 in sequence, and the second microstrip line 75 and the radiation unit 73 In connection, the plurality of second microstrip lines 75 and the plurality of radiation units 73 are located on the same side of the first microstrip line 74 .

[0031] Further, the distance between any two adjacent radiation units 73 can be set to be equal and the phase difference is equal, such as Figure 7 As shown in , the distances between the four radiation units 73 are equal, the phase of the radiation unit 73 closest to the chip 1 is Φ, and the phases of the remaining three radiation units 73 are Φ+△, Φ+2△ and Φ+3 Δ, the phase difference between any two adjacent radiation elements 73 is equal, both are Δ.

[0032] The electronic tag of the embodiment of the present invention can receive and transmit microwave signals directionally through the directional antenna, and is applied in the driving scene of road vehicles. The electronic code is sent to the vehicle radar, which improves the anti-interference and the effective utilization of radiated energy, and meets the requirements of road vehicles.