What is a Top Plate?

There are five interpretations of the roof, namely: 1. metaphors conflict and argue; 2. rock layers on the top of the roadway in the mine; 3. the upper edge of the box section on the project; 4. an invertebrate; 5. The full name of the military is "top plate" three-coordinate air / sea search radar.

1. Top board: (ding ban) top slab

The upper edge of the box section is called the top plate,

Apical plate, cephalic plate

For cap larvae, spoke rotors,

Roof introduction

"Top plate", full name "Top plate" three-coordinate air / sea search radar. Developed by Russia and widely equipped with naval vessels. When China introduced modern destroyers at the end of the twentieth century, it also introduced a full set of technologies for roof radar. The latest model is MAE-5. On the basis of the original model, the MAE-5's transmitting power doubled to 90 kW and the maximum effective distance was still 300 kilometers, but the detection range of fighters and missiles increased by 20% to 230 kilometers and 50 kilometers, respectively. It works in the E / H frequency band, and the slot antenna is installed back-to-back tilted, and the scanning rate is doubled than that of the single-sided radar. In addition to the ability to detect air and sea targets, the radar also has the functions of air control and low-altitude blindness. Its main features are strong resistance to electronic interference, high degree of automation, and good cost performance. The normal speed is 6 rpm and the war speed is 12 rpm. The data rate is 1 time / 2. 5 seconds. This radar adopts MTI, azimuth machine sweep, and pitch frequency sweep system. The working frequency band is C-band. The antenna beam width is 2 ° azimuth, 2.5 °-3.5 °, antenna gain 33-35dB, and total antenna weight 3. 5 tons.

The MP-710 "top plate" three-coordinate search guidance radar developed by China is responsible for airborne alert. The radar uses a unique back-to-back method, which is unique. The SAMPON phased array radar used by the British class 45 destroyer adopts this configuration. MP-710 adopts phased array system, two one-dimensional frequency scanning radar, azimuth mechanical scanning, and pitch frequency scanning system. The use of a tilted back-to-back method enables a two-band (E / H) multi-band radar to have good detection and guidance functions, and doubles the data law. The two radar antennas are inclined to each other, which can make up for the lack of capturing low-altitude targets; it can increase a certain detection distance and partially eliminate the radiation interference caused by mechanical rotation. It can be said that in the phased array system, in addition to the fixed polyhedral array, the rotating antenna is back-to-back.

The top plate is a one-dimensional frequency-scanning three-coordinate radar, which is technically similar to the American sps-48 series, with elevation frequency scanning and azimuth machine scanning. The process of beam pointing changes is: the frequency of the pulse group changes. Through the slow wave structure (delay line or serpentine end feed), the same frequency waves with different phases are obtained at the waveguide end (the same wavelength but the distance traveled is not the same length, forming a phase Poor), after spatial interference, a directional beam is formed. With intra-pulse frequency sweep, multiple beams can be obtained and the data rate can be increased. However, the operating frequency is exposed and vulnerable to attack; the frequency agility is limited; the height measurement and angle measurement accuracy are poor. Frequency-scan radars do not use a phase-shifting structure to form the phase difference, which is different from phase-scan radars.

Modern so-called one-dimensional phase-scan radars are generally classified as three-coordinate radars, and two-dimensional phase-scan radars are generally called phased arrays. The double-sided array of the roof radar is installed back-to-back obliquely. The two arrays have different sizes and different wavebands to increase the data rate. Inclined installation can increase the detection distance and narrow the beam. Data rate and stability.