CN-224232938-U - Virtual high-resolution millimeter wave antenna array and millimeter wave radar

Abstract

The utility model belongs to the technical field of millimeter waves, and particularly discloses a virtual high-resolution millimeter wave antenna array, which comprises a receiving antenna array arranged above and a transmitting antenna array arranged below, wherein a feed point of the receiving antenna array is electrically connected with a receiving end of a TR component, the feed point of the transmitting antenna array is electrically connected with a transmitting end of the TR component, the receiving antenna arrays are equidistantly arranged side by side, the distance between two receiving antennas in the horizontal direction is d, the distance between two adjacent receiving antennas in the vertical direction is d, the distance between a transmitting antenna TX1 and a transmitting antenna TX2 in the horizontal direction is 3d, the distance between the transmitting antenna TX2 and the transmitting antenna TX3 and the distance between the transmitting antenna TX4 in the vertical direction are d in sequence, the millimeter wave antenna array can provide high-precision horizontal resolution and vertical resolution, a large-angle horizontal resolution angle can be generated through the layout of the transmitting antennas, and a transmitting channel is switched through the TR component so as to realize the identification and tracking of single targets and multiple targets, and the stable switching of working modes in a complex environment can be satisfied.

Inventors

• YANG RONGSHUANG
• XIE YONG
• LU CHEN
• SHI LIN

Assignees

• 云南基投资源开发有限公司

Dates

Publication Date

20260512

Application Date

20250424

Claims (4)

1. 1. A virtual high-resolution millimeter wave antenna array is characterized by comprising a receiving antenna array which is arranged above and consists of eight receiving antennas RX 1-RX 8 and a transmitting antenna array which is arranged below and consists of four transmitting antennas TX 1-TX 4, wherein a feed point of the receiving antenna array is electrically connected with a receiving end of a TR component, the feed point of the transmitting antenna array is electrically connected with the transmitting end of the TR component, the receiving antenna arrays which consist of eight antennas are equidistantly arranged side by side, the distance between two adjacent receiving antennas in the receiving antenna array in the horizontal direction is d, the distance between two adjacent receiving antennas in the receiving antenna array in the vertical direction is d, the distance between the transmitting antenna TX1 and the transmitting antenna TX2 in the horizontal direction is 3d, and the distances between the transmitting antenna TX2 and the transmitting antenna TX3 and the transmitting antenna TX4 in the vertical direction are sequentially d, wherein d is half of the vacuum wavelength of a millimeter wave radar working frequency band.
2. 2. The virtual high-resolution millimeter wave antenna array of claim 1, wherein said receiving antenna comprises four rectangular microstrip patches distributed in a vertical direction and connected in series.
3. 3. The virtual high-resolution millimeter wave antenna array of claim 1, wherein the transmitting antenna comprises four rectangular microstrip patches distributed in a vertical direction and connected in series.
4. 4. A virtual high resolution millimeter wave radar comprising the millimeter wave radar antenna array of any one of claims 1 to 3.

Description

Virtual high-resolution millimeter wave antenna array and millimeter wave radar Technical Field The utility model belongs to a radar applied to traffic vehicle detection, and particularly relates to a virtual high-resolution millimeter wave antenna array and a millimeter wave radar. Background In the prior art, millimeter wave radar is a radar system that operates in the millimeter wave band. Millimeter wave band is located the sub-frequency band of electromagnetic spectrum, and the wavelength is between 1 millimeter and 10 millimeters, because millimeter wave has characteristics such as strong, the resolution ratio is high, interference killing feature is strong, consequently millimeter wave radar has extensive application prospect in many fields, such as unmanned, intelligent transportation, aerospace, military investigation etc.. The working principle of millimeter wave radar is based on the propagation characteristics of electromagnetic waves. When electromagnetic waves encounter an object, phenomena such as reflection, absorption and transmission can be generated, and through detection and analysis of the phenomena, information such as the position, the speed and the shape of the object can be obtained. The millimeter wave radar detects the property of an object by transmitting a millimeter wave signal of a certain frequency and then receiving the reflected signal, and can more accurately measure the distance of the object since the millimeter wave has a shorter wavelength. Meanwhile, the millimeter wave radar has higher anti-interference capability and can stably work in a complex environment. In the field of automobile manufacturing, millimeter wave radar technology has important application value as well. With the development of intelligent network-connected automobiles, the realization of functions such as automatic driving, automatic parking and the like depends on the perception of surrounding environment. The millimeter wave radar, as a high-precision sensing device, can effectively assist the driving system in realizing detection, tracking and recognition of a front target, and in addition, has advantages in monitoring the external environment of the vehicle, such as detecting pedestrians, vehicles, obstacles, and the like in front. In the traffic information acquisition, the microwave radar aims at extracting vehicle information from radar echo signals, and the traffic information is monitored in real time by means of speed measurement and distance measurement functions. In practical application, aiming at the problems of high-precision ranging, speed measurement, angle measurement, interference resistance and the like of a microwave radar, three key technologies are developed: The first item is that a non-equidistant microstrip array antenna technology and a long baseline ratio phase angle measurement level ambiguity resolution technology are adopted, so that the effective caliber of an antenna is increased, the angle measurement precision is improved, and the problem of lane division errors caused by inaccurate angle measurement of a remote vehicle target is solved under the condition that the number of receiving channels is not increased; The method comprises the steps of adopting a high-precision distance measurement and speed measurement technology, namely a distance speed high-precision two-dimensional joint estimation technology, developing a corresponding algorithm aiming at a Linear Frequency Modulation Continuous Wave (LFMCW) working system, realizing high-precision two-dimensional joint estimation of target distance and speed information on the premise of extremely small increase of calculated amount, improving the distance speed measurement precision by more than 5 times when the signal to noise ratio is not lower than-20 dB compared with the traditional FFT or periodogram-based method, and greatly improving the vehicle detection and positioning accuracy. The technical result is converted into serial products such as traffic gate speed measuring radar, traffic flow radar, traffic scene radar and the like, and the serial products are put into use in traffic highway monitoring projects and traffic intersections and expressway test points. However, the prior art has the defects that although the angle measurement precision of the millimeter wave radar can be improved by optimizing the antenna array layout and the like, in practical application, the angle measurement precision is limited due to factors such as antenna size, array complexity, signal processing algorithm complexity and the like. In some scenes with extremely high requirements on the positioning accuracy of the target angle, such as high-accuracy automatic driving obstacle avoidance and accurate track tracking of a vehicle, the conventional millimeter wave radar angle measurement accuracy may not meet the requirements, so that the decision and control of the vehicle under complex road conditions are deviated. Therefore, i