Radar is a transliteration of English radar, from the abbreviation of radio detection and ranging, meaning "radio detection and ranging", that is, to find targets by radio methods and determine their spatial position, so radar is also known as "radio positioning". Whenever talking about the origin of radar, there are always different opinions, but it is undeniable that radar technology first rose in the military field, and more mature military radar technology has appeared during World War II. The principle of radar is to measure the orientation of the target by using the sharp azimuth beam of the antenna, by measuring the elevation Angle against the narrow elevation Angle beam, so that the height of the target can be calculated according to the elevation Angle and distance. The principle of distance measurement is to measure the time difference between the transmitted pulse and the echo pulse, because the electromagnetic wave travels at the speed of light, it can be converted into the accurate distance between the radar and the target. The principle of speed measurement is the frequency Doppler effect generated by the radar according to the relative motion between itself and the target. The frequency of target echo received by radar is different from the frequency of radar transmission, and the difference between the two is called the Doppler frequency. One of the main pieces of information that can be extracted from the Doppler frequency is the rate of distance change between the radar and the target. When the target and the clutter exist in the same spatial resolution unit of the radar, the radar can detect and track the target from the clutter by using the difference of Doppler frequency between them. 1. According to the form of radar signal classification, there are pulse radar, continuous wave radar, pulse compression radar and frequency agility radar. 2. According to the Angle tracking method, there are monopulse radar, conical scanning radar and covert conical scanning radar. 3. According to the classification of the parameters of the target measurement, there are altimeter radar, two-coordinate radar, three-coordinate radar, friend and foe radar, multi-station radar, etc. 4. According to the technology and signal processing method of radar, there are coherent accumulation and non-coherent accumulation, moving target display, moving target detection, pulse Doppler radar, synthetic aperture radar, scanning and tracking radar. 5. According to the antenna scanning method, it is divided into mechanical scanning radar, phased array radar, etc. 6. According to the radar frequency band, it can be divided into over-the-horizon radar, microwave radar, millimeter-wave radar and Lidar. With the scientific progress in various fields such as microelectronics, radar technology continues to develop, and the research content and application fields are constantly expanding. At present, it has been widely used in military, aviation, communications, meteorology, transportation, environmental monitoring and other fields and industries. The water conservancy industry has also widely applied radar to water body monitoring, and derived a series of monitoring equipment, such as radar level meter, radar current meter, radar electronic water gauge and so on.
02 Measuring line radar Water level meter # Introduction Measuring line radar water level meter is an intelligent non-contact liquid level (level) measuring instrument based on the principle of microwave radar reflection. Using the transmitting, reflecting and receiving mode, the propagation speed of microwave is known to be a constant. By measuring the time difference between the transmitting pulse and the echo pulse, the distance between the radar antenna and the liquid surface can be calculated, and the liquid level height can be converted. The advanced detection technology and calculation algorithm are adopted to improve the measuring accuracy of the instrument, inhibit the interference echo, and ensure the real and effective measurement results. Radar water level meter can be widely used in various liquid level and solid material level height measurement, can also be used for distance measurement. It is very suitable for liquid level measurement in rivers, open channels, lakes, reservoirs and other scenes. Application Case 1 Application Case 2 Application Case 3...... 03 Characteristics of radar water level gauge
# Strong anti-interference ability is not affected by environmental factors such as temperature, sediment, dust, river pollutants, floating objects on the water surface, and air pressure. # Non-contact measurement adopts non-contact mode, the sensor and the water body are not in contact, and are not affected by the hydrological environment, which greatly reduces the workload of operation and maintenance. # Range Large range can be customized, up to 40 meters. # Low power consumption Low power microprocessor design, ultra-low power sleep mode, fast wake up. The device can be battery powered or solar powered.