77GHz sparse array automobile anti-collision radar receiving antenna

Abstract

The invention discloses a 77GHz sparse array automobile anti-collision radar receiving antenna which is composed of four microstrip antennas, and the lengths of the four microstrip antennas are the same. The lengths of the four antennas are consistent, and the phases of the signals reaching the antenna ports are consistent, so that the detection precision of the anti-collision radar cannot be effectively improved. And the receiving antenna is connected with the chip of the anti-collision radar through the imbalance-balance conversion balun. The four microstrip antennas are parallel to each other and are formed by sequentially connecting a preset number of groups of feeder lines and radiation patches, and the heights of the radiation patches on the same antenna are different. The antenna provided by the invention suppresses common-mode signals by using differential excitation, and the lengths of the antennas are consistent, so that the phases of the signals reaching antenna ports are consistent. While the effective aperture of the whole antenna array is increased, spatial spectrum ambiguity caused by lack of sampling is avoided, and radar measurement accuracy is improved.

Description

technical field [0001] The invention relates to the field of automobile auxiliary driving devices, in particular to a 77GHz sparse array automobile anti-collision radar receiving antenna. Background technique [0002] As the number of cars in our country increases, the frequency of traffic accidents also increases; therefore, in order to reduce the occurrence of traffic accidents, active safety configurations on cars are also becoming more and more abundant. Among them, the radar plays a vital role in the safety configuration of the car. The radar transmitter emits electromagnetic signals of a certain frequency around the car, and the electromagnetic signals will be reflected when they encounter other objects during the propagation process. The radar receiver receives the reflected electromagnetic signal, and the radar analyzes the received electromagnetic signal to obtain information such as distance, speed and angle of other objects. [0003] The current radar chip uses a...

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Problems solved by technology

[0007] From the above formula, it can be seen that the accuracy of the angle measurement of the spatial spectrum method depends on the aperture of the array antenna. The number of receiving array antennas of the ordinary vehicle radar is small, and the aperture is small, resulting in the blurring of the space spectrum; the accuracy of the angle measurement is low, which cannot meet the application of the vehicle radar. need

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