Introduction of Automobile Anti-radar Detection Instrument
Full-frequency anti-tachometer radar is a kind of vehicle equipment produced with the extensive use of a radar velocimeter. Its main function is to prompt the driver whether there is a radar velocimeter nearby. If it is installed in the car, it can detect whether there is a radar velocimeter around within a certain distance by receiving radar waves.
The radar velocimeter calculates the moving speed of the measured object according to the frequency shift of the received reflected wave. The radar beam has a large irradiation area, so it is easy to capture the target by radar speed measurement, without precise aiming. Radar equipment can not only be fixed on the road surface, but also be installed on patrol cars. It is a very important part of the "mobile electronic police" to detect the speed of the vehicle in motion; Secondly, the error of radar speed measurement is about: the speed v increases or decreases by 0.1031%V, which can fully meet the requirements of traffic violation investigation; Radar speed measurement has been used internationally for more than 20 years, with mature technology and low cost. From the present situation, the back speed measurement is still the main method on the urban roads in Beijing, but a small number of radar speedometers with forward speed measurement have appeared. Positive speed measuring devices are mostly used on expressways. Back means that the direction of radar wave and camera is the same as that of automobile. When the vehicle is speeding, the camera captures the rear license plate of the vehicle. Forward direction means that the direction of radar wave and camera is opposite to that of automobile. When the vehicle is speeding, the camera takes the front license plate of the vehicle.
The principle of radar detectors is very simple, that is, after receiving the radar signal, immediately give an alarm to prompt the owner to slow down. Its price generally ranges from 5,000 yuan in 800 yuan, and its performance is also very different. The biggest difference is that the frequency bands of radar waves that can be induced are different. Because the radar velocimetry equipment of roads in different cities in China is imported from different countries, the radar frequencies used are mostly different, and some radar velocimeters of different frequency bands from three or four countries are installed in the same city. The low-end radar detectors can only sense radar waves in one frequency band, while the high-end radar detectors can sense radar waves in multiple frequency bands. In addition, the distance of induction also reflects the performance of radar detectors. If the sensing distance is too close, the owner has no time to slow down and has been photographed; If the speed is too fast, it is easy to cause rear-end collision. High-end radar detectors can sense radar waves about one kilometer, while poor ones can only be sensed about 200 meters.
There are two kinds of microwave radar detectors, one is to measure vehicle speed by Doppler principle, and the other is to detect by continuous wave frequency modulation. Doppler radar continuously emits radar waves with a fixed frequency, and then the radar waves are reflected on the surface of a moving vehicle and then return to the radar receiving device. According to Doppler principle, the frequency shift of return wave and transmitted wave is proportional to the speed of vehicle. And a frequency shift represents a car passing by. This kind of detector can't detect stationary vehicles, and its speed measurement accuracy is poor for low-speed vehicles. Therefore, it is suitable for use on expressways, but not in urban traffic and crossroads. Continuous wave radar emits continuous frequency modulation waves. A stationary vehicle can be detected by measuring the distance between the detector and the vehicle. By the same token, the speed of a vehicle can be determined by measuring the time between two sign poles. For the detector, the distance between the marker rod and the detector and the distance between two marker rods are known. Through some algorithm, the vehicle speed can be obtained. However, radar detectors itself is expensive, especially the detector that can detect stationary and moving vehicles needs two transmitters and receivers, so the cost is relatively high. Radar detectors technology has outstanding advantages, and its signal anti-interference ability is very strong. However, it also has obvious shortcomings, and it needs an emission source to work. Therefore, it is inconvenient to use radar detectors on roads that cannot provide external power.
Elecdeer provides a full-function full-frequency radar receiving system, which is small in size and high in concealment, and can be mounted on the sun visor of the car. Applicable to any model, 100% accepted. The latest radar wave channel voice notification function, full Chinese warning, and enough response time to easily grasp the road ahead.
The above is the automobile anti-tachometer radar introduced to everyone. The technology is developing rapidly, but the starting point of all technological development is to make people live a better life. The same is true of automobile anti-tachometer radar. I hope today's introduction can help everyone.