Author: Alang bring the story of the first generation of U.S. fighter aircraft F 22 \think of it that is certainly a unique shape and sustained supersonic stealth cruise flight capability. However, one should not ignore its active phased array radar system, which gives the aircraft is multi-functional, multi-batch targets BVR combat capability. I want to say, this is the F-22 \ So, why the phased array radar system with such a wonderful feature? We have to begin at the beginning. We know that the traditional principle of radar is the first bunch of electromagnetic wave beam launched into the air cheap laptop battery, by mechanical means rotating radar antenna, so that the beam sweep certain areas (sky, ground or sea). When the electromagnetic wave beam will be reflected with the same goal of a certain echo of the echo using the computer solving, orientation and distance can be a target. Phased array radar is different from traditional radar antenna. It relies on the firing line in the plane ~ blocks arranged in a regular manner as many radiation units (known as array element), the phase f of the electromagnetic principle, through computer control of all exports to the antenna radiating elements to change the current phase of the change in the direction of the beam, scan of a certain region, the receiving unit will echo the received radiation enter the host p90x, after calculating the target position, distance to track and target detection. Therefore, phased array radar, also known as electronic scanning radar. phased array radar, there are two, one is the active phased array radar wholesale Fujitsu Laptop Battery, one is passive, phase array radar wrestling . Stored in the difference between the two: active phased array radar antenna is called T / R module receiving and transmitting devices, each piece of T / R module can generate electromagnetic waves; and passive phased array radar is a uniform transmitter and receiver, plus with phase control for phased array antenna from the antenna itself does not have radar. Active and passive phased array radar in function without much difference, but active phased array transceiver device is only T / R modules, so the structure, light weight, low failure rate, even if the number of neighboring elements failure and damage, nor will it affect the performance of the whole system. The passive phased array radar and conventional radar antenna and processing system l have differences, structural weight, survival rate Dengjun can not be compared with active phased array radar. Therefore, the active phased array radar is the future development of airborne radar aircraft direction. Compared with the traditional radar, phased array radar, a major breakthrough in performance, mainly in the following areas: 1. Has to deal with multiple goals. Phased array radar using electronic scanning flexibility, speed and multi-beam, can be time division principle, able to track the work side of the search side, can be compatible with the computer, can simultaneously detect and track the search in different directions and different heights batches of goals, and many guided missiles simultaneously on multiple targets to attack. 2. Versatility. Phased array radar can simultaneously control the formation of multiple independent beams were used to perform a search, detection, identification, tracking, exposure, and guided missiles and other features. Therefore, it will have a more dedicated radar radar functions. 3. Short reaction time, data update rate. Because phased array radar can simultaneously scan different direction, coupled with scanning electronic control rather than mechanical rotation, the reaction time is short wholesale Apple Laptop Battery, the data update rate greatly increased. Mechanical scanning radar is limited by mechanical rotation frequency, the data update cycle for the second or 10-second, the electronic scanning radar, compared with milliseconds or microseconds, and is more suitable to deal with high maneuvering targets. 4. Anti-interference ability. Phased array antenna aperture distribution can be used on multiple units integrated into a very high power and energy can reasonably manage and control the main lobe gain, according to the needs of different directions on the distribution of the different emission energy, easy to implement adaptive sidelobe suppression and adaptive anti-kinds of interference, is conducive to long-range goals and found a small reflector of radar targets, but also enhance the anti-radiation missile. 5. High reliability. Large phased array radar and the parallel array, even a small amount of component failure can still work. In addition, with the development of solid reading devices, solid-state phased array radar more and more devices (or even produce a solid-state phased array radar), the average time between failures increases, even though 10% of the array 7 death damage nor will it result in a performance of the system of National People's Congress. 6. With stealth capabilities. Traditional mechanical rotating radar, the structure will cause a large echo, and the use of electronic scanning of the phase array radar can fall to minimize this effect, when the phased array radar will reduce the emission of the narrow beam was found opportunities electronic jamming systems and make each other's hard work. phased array radar, developed in China for many years, in-air missile systems wholesale HP Laptop Battery, detection systems and the new destroyer artillery already on the actual application. However, airborne phased array radar must solve three problems: first T / R module size. Generally 28 T / R modules using a set of common components, a module with the number of units CCP the better, but sharing component failure will impact on radar performance more significant. Therefore, there must be balance. Second, high-power low-voltage power supply. Phased array radar antenna elements required voltage is not high, but the required current is high. As airborne phased array radar system of power, must be high reliability, small size and light weight. third is wikileaks ufoing. Phased array radar antenna array with hundreds of thousands of surface density T / R modules, thermal power is very high, how wikileaks ufo is the guarantee of their radar and reliable working condition. Active phased array radar technology more difficult, and passive phased array radar technology is relatively little difficulty, equipment easier, as the active phased array radar, airborne radar substitutes or low-end products, after a preferred option. airborne phased array radar developed despite the difficulties, but we believe that in the near future wholesale Dell Laptop Battery Design Week 2010 201 002 footwear industry - China Shoes Online cnxz.cn, China's stealth F-on the re- some back burner installed on your Jin Jing.