Some claim that the phased array is used in the early warning radar system to be advanced and that p

Two concepts that do not conflict are the phased array (PA) and the pulse-Doppler (PD). The phased array is a complex antenna that uses many elements. While working, the sub-beams from each antenna element are combined to create the main beam in space. This is possible due to the unique component of each element-the wave controller. The wave controller calculates the wave code for each array element based on the requirements of the main beam and submits it to the phase shifter. Besides, many things correspond to the array elements. Each phase shifter directs the array element to emit signals in a particular direction according to the wave code. This allows you to use one set of wave controls codes to direct the main beam to the east for the last millisecond and another set to direct the main beam to the west for the next millisecond. This is known as electronic scanning and is very flexible.

Initially, in phased arrays, a transmitter was used. The transmitter signal had to be transmitted to more than N elements. This is known as feeding and results in a significant loss of distance. After that, the array element was used. Later, the transmitter unit became smaller. In general, the feed loss is significantly reduced when the two units are combined. Also, the receiver is processed in the same manner to create a T/R part. This is how an active phased array is formed. The core of the phased antenna is therefore mainly reflected by the receiver, transmitter, or antenna. This is the front-end radar.

The core of the radar's pulse-Doppler (PD) concept is signal processing. According to Li Nengjing, a pulse-Doppler radar can be described as a precise spectrum analyzer. The PD is responsible for processing and analyzing the front-end signals. The two concepts of phased array or PD mean that the water from the well doesn't violate the water in the river. Both can exist on a radar. However, it can have only a Phased array with PD or vice versa. F22's AN/APG77 radar has an active phased arrangement + PD. Earlier airborne fire control radars had PD but no phased array. It is easy to misunderstand this concept, believing that PD and phased array are mutually exclusive concepts. For airborne radars, PD can be ignored to save trouble.

Further, the advantage of phased arrays is that electronically scanned beams can change their direction quickly and randomly. This eliminates the need for mechanical scanning devices which reduces overall radar system failure rates. You must know that the driving mechanism of an antenna is the component with the highest failure rate within the mechanical scanning pulse-Doppler radar systems. The radar can be freed from the inertia caused by the antenna machine's sweeping motion and can point to any location. With time, its tracking ability has been greatly improved. However, it is expensive and has poor detection of targets with large deviation angles. And it is used mainly to remove ground clutter.

There is no advanced phased array and there is no obsolete principle with pulsed Doppler. Pulse-Doppler is an essential housekeeping skill, and phased arrays are the cherry on top for radars that have to compete with ground clutter. If the price is reasonable, it should be used. The price of phased-array antennas is continuing to fall with the improvement in the electronic industry. It will soon be a standard configuration.

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