еще один вопрос, который поднял бы вуду, это зона обзора Ирбиса. И """стандартные """ зоны обзора "западных" брлс.

беря любую станцию , будь то AN/APG-63 или Меч,  БРЛС рафаля  РЛС PS-05/A
общим  является один из фиксированных секторов  обзора по углу места.  -  В " стандарте "  10 градусов , и этого вполне достаточно, диапазон высот полета самолета  0,5-12км -15км. Для боя на средних - больших дистанциях -этого за глаза.

По азимуту - +-30 (60).   И как правило есть более узкие  - (+-15)30   (возможно и меньше.) градусов.  И около 5 градусов по углу места.  (30*5)
схематично

в итоге   макс дальность  достигается в среднем по палате  для сектора поиска  ~ 30*5

известны Добн Ирбиса и Барса для 300 квадратных градусов   -  сектор 30*10 . 

для ирбиса 100кв градусов. -  20*5

Соответственно
режим БВБ, с максимально возможным углом поимка по углу места ,
и сектор +-60 ((+-70)
Где АФАР может формировать многолучевую ДНА , резко сокращая Добн получать очень короткое время полного  обзора БРЛС всего рабочего сектора .  (У вуду этот режим совпадает с макс. дальностью обнаружения станции)

Отредактировано dell (2018-07-22 21:15:54)

Вы точнее пишите. Он (только!!)время накопления пишет порядка 15 секунд!! Хотя что от шизофреника ожидать.

Отредактировано dell (2018-07-23 10:11:30)

От интернета отключить кстати вполне лечебная процедура....

Вот такая гольная цифра это вообще ни о чем.

Отредактировано cobra (2018-07-23 11:28:34)

Из презентации АПГ-79 АФАР для ф18

Основная зона обзора  -   30*40

западное про Cued search

From Radar System Performance Modeling, Second Edition
Radar search, also called radar surveillance, is the process of examining a volume of space with the objective of detecting targets in that volume. The search objectives usually include the search volume, the characteristics of the targets to be detected, and the detection requirements. The detection requirements are often defined by the probability of detection, P D, and the probability of false alarm, P FA, or the false alarm rate r FA. The required P FA may be calculated from r FA using the techniques given in Section 6.2.

Common radar search modes include:

Volume search, where a relatively large volume of space is searched. Volume search using rotating search radars is described in Section 7.2, and using phased-array radars in Section 7.3.

Cued search, where a search is preformed in a relatively small volume to acquire a target whose position is approximately known. Cued search using phased arrays and dish radars is described in Section 7.4.

Horizon search, where the radar searches for targets coming over the radar horizon. Horizon search by phased-array radars is described in Section 7.5, and by dish radars in Section 7.6.

7.1 The Search Equation
The radar detection range in a search mode, R D, is given by general form of the radar search equation [ [1], p. 255]:

where:

t S

= search time;

? S

= search solid angle;

?

= target RCS;

S/N

= signal-to-noise ratio;

k

= Boltzmann's constant (1.38 10 ?23

Отредактировано dell (2018-07-23 12:56:09)

зарубежная расшифровка магического LPI, (по словам западных урапатриотов присущим только АФАР, непонятно по каким, ими не объяснимым  причинам)
как я уже говорил, обычный широкобазовый сигнал, с большой продолжительностью но меньшей пиковой мощностью. Который может быть характерен как для АФАР так и для ПФАР.

Low probability of intercept
Radar systems work by sending out a signal and then listening for its echo off distant objects. Each of these paths, to and from the target, is subject to the inverse square law of propagation in both the transmitted signal and the signal reflected back. That means that a radar's received energy drops with the fourth power of the distance, which is why radar systems require high powers, often in the megawatt range, to be effective at long range.

The radar signal being sent out is a simple radio signal, and can be received with a simple radio receiver. Military aircraft and ships have defensive receivers, called "radar warning receivers" (RWR), which detect when an enemy radar beam is on them, thus revealing the position of the enemy. Unlike the radar unit, which must send the pulse out and then receive its reflection, the target's receiver does not need the reflection and thus the signal drops off only as the square of distance. This means that the receiver is always at an advantage [neglecting disparity in antenna size] over the radar in terms of range - it will always be able to detect the signal long before the radar can see the target's echo. Since the position of the radar is extremely useful information in an attack on that platform, this means that radars generally must be turned off for lengthy periods if they are subject to attack; this is common on ships, for instance.

Unlike the radar, which knows which direction it is sending its signal, the receiver simply gets a pulse of energy and has to interpret it. Since the radio spectrum is filled with noise, the receiver's signal is integrated over a short period of time, making periodic sources like a radar add up and stand out over the random background. The rough direction can be calculated using a rotating antenna, or similar passive array using phase or amplitude comparison. Typically RWRs store the detected pulses for a short period of time, and compare their broadcast frequency and pulse repetition frequency against a database of known radars. The direction to the source is normally combined with symbology indicating the likely purpose of the radar – Airborne early warning and control, surface-to-air missile, etc.

This technique is much less useful against a radar with a frequency-agile (solid state) transmitter. Since the AESA (or PESA) can change its frequency with every pulse (except when using doppler filtering), and generally does so using a random sequence, integrating over time does not help pull the signal out of the background noise. Moreover, a radar may be designed to extend the duration of the pulse and lower its peak power. An AESA or modern PESA will often have the capability to alter these parameters during operation. This makes no difference to the total energy reflected by the target but makes the detection of the pulse by an RWR system less likely.[9] Nor does the AESA have any sort of fixed pulse repetition frequency, which can also be varied and thus hide any periodic brightening across the entire spectrum. Older generation RWRs are essentially useless against AESA radars, which is why AESA's are also known as 'low probability of intercept radars. Modern RWRs must be made highly sensitive (small angles and bandwidths for individual antennas, low transmission loss and noise)[9] and add successive pulses through time-frequency processing to achieve useful detection rates.[10]

Отредактировано dell (2018-07-23 14:11:25)

первоисточник режимов работы

The APG-77 functional capability is illustrated in figure
7.
The design implements multiple modes of operation including long range search (Range Search), long range cued search (Cued Search), all aspect medium range search (Velocity Range Search), track (Multiple Target Track), AMRAAM data link capability (Missile Update), target identification
(ID),
target cluster breakout (Raid Assessment), and weather detection (Weather), Radar growth features include the incorporation
of
air-to- ground synthetic aperture mapping, air-to-ground ranging, enhanced identification capability, and expanded field of regard. The increased field of regard growth feature involves the incorporation of side “cheek” arrays. Growth provisions for space, power, and cooling have been included in the design allowing for minimal impact upon incorporation into the system

Отредактировано dell (2018-07-23 14:50:33)

Это ерунда / чухня, / ересь потолочная /бредни сума шедшего , - нужное подчеркнуть .
Во первых 3 кв. метра
во вторых 3 сек

порядок примерно такой.

https://www.youtube.com/watch?v=yRcPvc37ly4
на видео есть  подсказка времени цикла однократного обзора

Отредактировано dell (2018-07-23 18:18:43)

Может затягивание с серией СУ57 связано с ожиданием радиоптического радара .... Промышленности для поддержания штанов хватит выпускать по паре Т57 в год.
Поигрались наши с СУ57 и таки не поняли как его применять в реалии. Вот и ждут сверхшилополосный радиооптический радар, с ним концепция вынесенного вперед СУ57 в качестве ДРЛО работает совсем на другом качественном уровне.

Такая лажа.
структура сигнала и его обработка как учтена? В каких мс

Отредактировано dell (2018-07-23 20:15:25)

Вот именно что очень приблизительно. Я не могу сказать, что прям верю в 3 секунды... вот  4-5 секунд похоже на правду. Но 10 и более это Ваши фантазии.

Отредактировано Alex_Flanker (2018-11-06 19:37:04)

Не, наработка на отказ у первого заслона была вообще мальенькая. У "заслона-А" возросла.