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Pulse compression is a term used to describe any form of intra-pulse modulation(modulation that occurs during the pulse, rather than between.. ie frequency or phase modulation) that enables the use of specialized signal processing that improves detection range, reduces noise (from environment and jammers), and improves range resolution. example As you may know, long pulse durations are good for increased detection ranges (more energy on target). But having a long pulse reduces your radars range resolution. If two targets are separated by 100 ft in range, and your pulse is 400 ft in length the return from the two targets will look like one long return (one large target) rather than two. Pulse durations need to be short enough to see the 'nothing' between the two targets. Given the same scenario 'two targets on the same azimuth separated by 100 ft in range' a pulse of less than than 200 ft would be needed to see two separate returns from the two targets. 200 ft because even though the targets are separated by 100 ft, the pulses of light have to travel out an extra 100 ft to the second target and than an extra 100 ft back. thus the second reflection trails the first reflection by 200 ft. Anyway, back to pulse compression. One form of pulse compression is linear frequency modulation (commonly referred to as a CHIRP) on the pulse. This means that the carrier frequency of the pulse gradually slides to a higher or lower frequency. Radar engineers want long pulses for improved detection ranges but ALSO fine range resolution that you'd get from a short pulse. By using a CHIRP, they can emit a single long pulse, say 500 ft long. Upon receiving the reflections from the target, the receiver will filter the long pulse duration by frequency into maybe 100 ft sections. Then insert a delay and sum the outputs together. The result is a short pulse with the amplitude of the long pulse. If two returns exist, then the output would have two separate pulses. Use this visual reference. http://www.radartutorial.eu/08.transmitters/pic/pulscompression.big.gif The visual reference above has a pulse compression ratio of 5:1 If the pulse duration was 5 microseconds long than the 'effective' pulse duration is 1 microsecond. PRF/PRI modulation is a form of inter-pulse modulation (the altering the time between pulses). I can explain it later when im not busy.

Got some questions before I buy. 1. Is the EW page listed in the AV-8B NATOPS coming to this module? https://info.publicintelligence.net/AV-8B-000.pdf 2. Is the RWR still WIP? I noticed in a video that the RWR doesn't produce audio feedback for 'critical' threats or lock-ons. Is this intentional? The only info I have on the ALR-67 is from the F-14D Manual and it states that RWR audio is provided for the following -missile alert -missile launch -critical threat (inner circle? Lock on?) -status change (new guy? Non-critical ring to critical ring?) Also the RWR is supposed to push cues to the HUD. I imagine in a similar fashion to the jammer cues. Is this coming to DCS: AV-8B N/A?

Website states one of the features is a "Fully functional KX-155 Radio".. Is VOIP coming to DCS, or do they just mean the dials work? http://leatherneck-sim.com/christen-eagle-ii-announcement/

Got some questions before I buy. 1. Is the EW page listed in the AV-8B NATOPS coming to this module? https://info.publicintelligence.net/AV-8B-000.pdf 2. Is the RWR still WIP? I noticed in a video that the RWR doesn't produce audio feedback for 'critical' threats or lock-ons. Is this intentional? The only info I have on the ALR-67 is from the F-14D Manual and it states that RWR audio is provided for the following -missile alert -missile launch -critical threat (inner circle? Lock on?) -status change (new guy? Non-critical ring to critical ring?) Also the RWR is supposed to push cues to the HUD. I imagine in a similar fashion to the jammer cues.

The rivets match up perfectly. Its gotta be the bi-plane.

Yes, however they also had the F4U mostly done. But M3 decided to hold off on it until they had a proper environment and opponent(ie the A6M). It could be that they thought this would make them money in the mean time. Time will tell if this works out. (if it is a bi-plane)

Probably a aerobatic mode with a score system. Who knows, maybe were wrong

Yea this wont go over easily.. A lot of hype for a DCS: Non-combat biplane? I mean it makes sense for M3. With the loss of half the team, to produce a cheap module(minimal avionic systems) with easily accessible data. I just dont think the DCS fan base is interested TBH.

Looks like the top wing of a bi-plane.. :/

For chrome users, if you goggle search that image, "neon" comes up. (ie the picture is titled "neon". Also, the neon wiki page has this.. https://en.wikipedia.org/wiki/Neon#/media/File:Cubic-face-centered.svg

Right now in DCS: F-5E AN/ALR-87 there is no "lock tone". You can get locked on by a SAM or AI radar, and you wont get any audio. The only audio you get is the initial "new guy" sound that could have been minutes ago, and a missile launch warning. That does not sound right. I've listed documentation above that shows that the ALR-46 does provide constant audio. I believe in more modern RWRs you have to select "HANDOFF" and constant audio from the priority RWR indication (inside the diamond symbol) is provided. At the very least, the pilot should have constant audio feedback that he's being locked on to (lock tone). Also, here is a video for you to look at. Perhaps you can explain the constant audio heard in these videos. (8:05 mark) (RWR audio starts at 1:08 mark, and you can hear the FAN SONG go off at 3:11 mark) The other problem we've come across is how the developers implemented the "search" button. They made it so that when the search button is selected, only radars in a search or acquisition mode appear on the display. And when its not selected only radars in a lock on mode are displayed. Meaning if an F-18 is in RWS mode looking at my aircraft, I'll only see "18" indication when "search" button is depressed. If that same F-18 switches to STT on me, he will disappear from my display and I wont see him (and as before, i also wont hear him). I'd have to manually de-select the search button to see that an F-18 is locking me. This is not correct. From what I understand, the "search" button is used to show Early Warning radars and other dedicated search radars (not search modes) if the pilot wishes to see them. With the search button deselected all threat radars (including SAMs and fighter radars) should be visible regardless if they are in a search mode (RWS, TWS) or a targeting mode (STT) BTW: input from professionals like yourself is greatly appreciated. thank you!

I made this logic tree based on how RWR launch indications are currently presented in DCS. As I only know what outcomes the ED team has presented to us, I've filed in and assumed the variables that make sense for these outcomes. This is meant to help newcomers and potentially help debates about what should and what shouldn't occur if these principles are maintained. Please don't flame me!!! : smilewink: And let me know if you see any mistakes.

I think there might be some ALR-67 synthetic audio in these videos, if you were still looking for something. (a lock-on tone?) (11 seconds in, 'new guy' audio?) (and yes i realize this is a different aircraft. But it uses the same ALR-67)

russkie RWR design has shifted toward more western approach. Center display Left display Left display below looks to be setup to support more than just the radar. It looks like a fused display for all data sources

The altitude clutter line that I mentioned has nothing to do with the Jaybird radar (RP-22?).. I only brought that up because people here brought up radars struggling to detect matching speed targets. The altitude clutter line only affects pulse doppler radars, because only pulse doppler radars measure the doppler spectrum. The Jaybird is not a pulse doppler radar, and thus would not suffer from this problem. That being said, old school pulse radars, like the Jaybird, have to deal with a lot of clutter that could saturate the reciever. One technique used to compensate for this was AGC, or Auto-Gain Control. Sidelobes exist on all antennas and can allow ground reflections to seep into the receiver. Being closer to the ground would mean more noise from the sidelobes which could trigger the AGC to lower the receivers gain. Doing so could prevent a weak target from making past the detector. Now, obviously DCS is not simulating these physics and we have no means to determine how degraded the Jaybird would be at low altitude. That being said, the radar uses a small parabolic cassegrain antenna, so it's safe to assume it's going to have decent size sidelobes (compared to slotted array designs being used by the west at the time). I'm not sure if the radar has any sidelobe reduction techniques (guard antenna for sidelobe cancellation, sidelobe blanking, STC, etc) but if it doesn't then you can expect performance to go out the window down on the deck.

Not detecting aircraft who match your speed is a problem associated with Pulse Doppler radars. However, it is not because the targets doppler shift is the same as the main-beam ground, the relative closing velocity between the radar and the main-beam ground is high (example, 300 knots), but the relative closing velocity to the jet you are chasing is close to 0 (as they match your speed). The reason its difficult to track targets with almost no doppler shift is because of the 'altitude line' clutter in the frequency spectrum. Your airborne radar has sidelobes. While weaker than the half-power main-beamwidth often referenced in manuals, if reflected off a massive RCS object these sidelobes can hinder your radars performance. Well it turns out that the ground below you has a huge RCS. The sidelobes from your antenna will radiated energy in many directions (including downward) which can reflect back up into your receiver. Because you are for the most part maintaining your altitude, the doppler shift of the altitude return is centered around zero. Below is a picture of the doppler spectrum. The alitude line clutter is centered on your radars actual transmit frequency. As you can imagine, sidelobes emitted 90 degrees downward from your heading have zero doppler shift. But sidelobe energy emitted at 87 degrees downward would have a slightly positive doppler, and 93 degrees slightly negative. But as you expand away from the 90 degree altitude line, the energy emitted is more likely to reflect away from you then back up at you. Thus its mostly the energy emitted directly below you (at 90 degrees) that has a significant impact on your receiver. Targets can hide in this portion of the doppler spectrum just like they can in the "main-Beam ground clutter" (the doppler notch). Pulse doppler radars have special thresholds for these regions so that clutter is not processed as an actual return and displayed on the scope (false target). Using a low PRF, radars can employ Sensitivity Time Control (STC) to gradually increase the sensitivity of their radar receiver. Doing so decreases the amplification of close proximity returns, like sideloe ground clutter. This makes it possible to significantly reduce sidelobe clutter, including the "altitude Line" clutter. This is why engineers say low PRF waveforms have 'good main-beam performance'. Its also one of the reasons why you might use a low PRF for ground mapping in a pulse doppler radar.

This is awesome!!

Pulse width (also known as pulse duration) has nothing to do with the carrier frequency of a signal. The pulse duration just refers to the duration a radar transmits (the ON time for a single pulse). Usually pulses are between .5 and 100 microseconds long. The longer the pulse, the worse the radars ability to 'break out' closely spaced targets in range (the reflection from two targets may look like one really long return instead of two distinct returns). Thus short pulses have better range resolution (its better at breaking out closely spaced targets on the same bearing). However, shorter pulses means less power on target which equates to less energy reflected. Less energy reflected means shorter detection ranges. Modern radars make use of pulse compression, where a long pulse duration is used to maximize energy on target, but the pulse is modulated with frequency or phase modulation that allows the radar signal processor to section off tiny slices of the pulse to achieve an 'effective' pulse duration much much smaller, giving it excellent range resolution. (best of both worlds)

I actually prefer female voices on the radio.. As do many pilots i know IRL. Personally, I wouldn't mind new voice overs in DCS (including female voices). Though I would not prioritize it on my DCS wishlist. However, not having enough representation doesn't make the game, or anyone not bothered by the missing female voices, sexist. (referring to echo's comment) Two bad votes after almost 7000 views, and you think there must be some sexism/angry men. Two bad votes and you tell everyone You're jumping to conclusions and assuming the worst in people.

Lowering standards for 'representation' purposes is a terrible idea. Many people who support 'equality of outcome', instead of equal opportunity, find that the only way to balance the outcomes is to force quotas and lower standards.

Jumping to conclusions are we.. The two votes who disagreed with the OP must be sexist right? It couldn't be that they want ED to focus their attention on the actual simulation and content, instead of the gender of the low poly avatar who's hands and knees are the only thing visible. Virtue signal elsewhere

Military wise.. Some women can.. Most women cant. Men and women are different, but everyone should be afforded the opportunity to try and treated with dignity and respect. That being said, if someone doesnt play a game because there isnt enough representation, they probably arnt that interested in the game.

Any pics of the version with the mini-stick?

So... with the AIM-7P having same M-LINK as the AIM-120/AIM-54 https://www.forecastinternational.com/archive/disp_pdf.cfm?DACH_RECNO=600 (page 5) I wonder if it could be initially launched in TWS and switch to STT/HPRF illumination during the terminal stage of the intercept to delay the target RWR from recognizing the launch...

Wags said they plan on incorporating the AIM-7F and H versions in addition to the AIM-7M. Is anyone familiar with the AIM-7H?? https://forums.eagle.ru/showpost.php?p=3283891&postcount=12