Well I was talking abt the same mate! the silent Eagle.
F-15 strike eagle has got AN/APG-70 AESA radar, here's the A-A modes of that radar.
Range While Scan (RWS) modes: The RWS mode provides all-aspect (nose-on, tail-on) and all-altitude (look-up, look-down) target detection. This is the most commonly used mode upon nearing a hostile environment. It is a good balance of wide volume, and fairly rapid scan. This mode is used to resolve (detect) multiple targets separated by less than the antenna beam-width, at long range. There are three RWS modes, depending on what pulse repetition frequency (PRF) is used for emitting radar energy. In RWSH mode high PRF is used, while in RWSM mode medium PRF is used. High PRF's are better to detect distant contacts with high closure rates with the risk of low or no-closure contact not showing up on the radar screen. Medium PRF's are not very good on long ranges since they are subject to clutter when receiving returns from long ranges, but they are useful for detecting medium-range low closure targets or targets which are below the radar water line. A good mixture of high and medium PRF's is realized in RWSI mode (interlaved RWS) when the radar emits eneregy alternating between high and medium PRF's as it scans through bars.
Range Gated High (RGH) mode: This mode uses a single PRF somewhere between those used in RWSH and RWSM modes. Returns are processed electronically to find low and high closure targets. This mode may not as accurate as RWSI, but can find certain targets more quickly. Note that this mode can detect targets up to a 160 nm range, but it is sensitive to altitude, it can be confused by ground clutter below 4000 feet.
Velocity Search (VS) mode: This mode is specifically for detecting medium and high closure targets, with the cost of not detecting low and no-closure targets at all. This mode displays targets on the radar screen by azimuth and velocity instead of by azimuth and range. Note that sometimes a fast moving part of the target (a turbine blade for example) can make VS mode detect a speed much higher than the actual speed of the target itself. This phenomenon is called Jet Engine Modulation (JEM).
Vector (VCTR) mode: The scan rate for this mode is half as normal, about 35 degrees per second. This means that a full scan takes twice the time, but the computer uses this time to make extra work, thus enhancing the detection of objects which have a low radar cross section (RCS). Lower RCS contacts are picked up from greater distances by using VCTR mode. This mode uses high PRF's only.
Track While Scan (TWS) modes: Track-while-scan means that the radar does its normal right-to-left, left-to-right scanning while it is actively tracking a couple of targets. TWS uses either high or medium PRF's. In TWS mode the radar beam covers an area much smaller than the maximal 120 degrees, but this way the target updates are much quicker. In takes around 2 seconds for the radar to complete a full scan. The arc and number of bars covered by TWS scan can be set to different settings: 'wide' (60 degrees with 2 bars), 'medium' (30 degress with 4 bars) and 'narrow' (15 degrees with 6 bars).
Single Target Track (STT) mode: If the pilot marks a single target for tracking, then the radar enters STT mode and begins tracking that specific target. This tracking uses a 3 degree mini-raster of radar energy centered on the target with very quick scans thus rapid target updates. If STT mode is entered from any of RWSI, RWSH, RWSM, RGH, VS or VCTR modes, then all other contacts disappear from the screen. If STT mode is entered from TWS or from HDTWS mode, all other targets remain on the screen. In STT mode exact data of this single target are are immediately available, such as altitude, range, closure rate, heading, aspect angle and true airspeed.
Dual Target Track (DTT) mode: This is the same as STT mode, but it tracks two targets simultanously. This mode supports the AIM-120 AMRAAM only (it is able to receive guidance from the F-15E in its non-active phase of flight) and provides no support for the AIM-7 Sparrow. Not that practically no one uses DTT mode, since TWS mode is much better from practically every aspects.
Auto Acquisition modes: All the modes above are for detecting targets while target designation is done manually by the pilot. Sometimes the situation dictates otherwise. To aid the pilot in snap-locking a target, there are five modes of the AN/APG-70, all of which are designed to acquire and designate the target automatically, within the limits of the given mode. These modes are the following:
-- Super Search (SS) mode: SS mode projects a 20 degree circle onto the center of the HUD. The radar locks up the first target within 500 feet and 10 nm that enters this circle.
--
Boresight (BST) mode: BST mode projects a 4 degree circle onto the center of the HUD. The radar locks up the first target within 500 feet and 10 nm that enters this circle.
--
Long Range Boresight (LRBST) mode: LRBST mode projects a 4 degree circle onto the center of the HUD. The radar locks up the first target within 3000 feet and 40 nm that enters this circle.
--
Vertical Scan (VTS) mode: In VTS mode the radar beam covers a vertical area of about 7,5 degrees azimuth and of an elevation between 5 degrees and 55 degrees above the nose of the F-15E. The radar locks up the first target within 500 feet and 10 nm that enters this area. This mode is useful for targeting enemy aircraft in a turning fight.
--
Guns (GUNS) mode: Despite its name GUNS mode has nothing to do with the built-in gun of the F-15E. It is just a moderate range and wide scan auto ACQ mode of the radar. In GUNS mode the radar scans a 60 degree azimuth and a 20 degree elevation area (that is 30-30 degrees to the left and right and 10-10 degrees up and down). The radar locks up the first target within 3000 feet and 15 nm that enters this area.
Electronic Attack (EA) modes: In EA modes, the radar automatically reconfigures itself when inevitable signs of enemy jamming activity are detected. Facing enemy ECM activity, the radar tries to select special search and tracking modes which are the least sensitive to enemy jamming.