Artillery has gone through an incredible evolution since the second half of the 20th century. The M109 Paladin is a great example of how these weapons have evolved.
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At first glance it looks very similar to the gun that you and I saw either in Vietnam or the beginning of my career.
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As I mentioned in my earlier post, the chassis is an ancient design and has a hard time maintaining pace with the Bradley and Abrams. We tried to replace it around 2000 with the Crusader, but Rumsfeld killed the program because air power would handle all that fire support for the army.
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That hasn't worked out so well, so the Army keeps evolving the M109.
As I am sure you remember, firing artillery was a survey exercise. Survey had to be extended to the firing location so that the aiming circle - a survey instrument - was set up on a known point. Each gun was then surveyed in individually by the battery XO using the aiming circle and the gunner's sight on the gun. The crew then put out aiming stakes which became the aiming point for each gun. When the XO finished laying the battery, all the guns tubes were pointed in the same direction. Firing commands to engage a target were in elevation and deflection - number of mills (fractions of degrees) deflected from the aiming stake.
An equally arcane science took place in the fire direction center where the fire direction team used a large protractor to measure range and direction to target, the map provided height of target, and slide rules for various shells and powder charges provided elevation. Of course, lots of other things like weather (met), earth rotation, and tube wear went into the final firing solution. Even with all that, the rounds usually were adjusted onto the target before the whole battery fired for effect.
Today, the Paladin system is far more accurate and far faster. The howitzer itself, is equipped with a GPS navigation system. This means the gun does not require anyone to survey it into position. It also means that that the gun "knows" where its gun tube is pointed at every moment. It also has an onboard firing solution computer. So unlike the kabuki dance in the fire direction center of old, the Paladin simply needs a target grid.
As you can imagine, this makes artillery far more responsive than the Vietnam or even Gul War eras. It also means that the guns can be dispersed and far less easily targeted by counter fire. Instead of the old call for fire "Hey you this is me, Fire Mission!", the observer, whether FO, UAV (drone), radar, etc sends a digital target location to the Fire Direction Center. This is a burst transmission - no words are spoken. In the FDC the target, based on the priority of fires determined by the commander, is allocated to a section, battery or battalion for attack. The target grid is then passed digitally to the computer on the designated guns which instantly process the fire mission and point the tube in the correct direction. The crew loads the round, adds the appropriate charge, and fires the designated number of rounds.
The howitzer can then immediately scoot to a different firing position in a situation where a peer enemy might have counterfire radars.
The firing computer on the howitzer is constantly provided through those same digital communications with updated met data while monitoring its own gun tube wear. Unlike the observed corrected fire you knew, virtually all missions are fire for effect with first rounds on the target area, and all of that with the "dumb" munitions you knew.
Ammunition also has gone through a real revolution that is still evolving. Back in the Vietnam or Gulf War era, it would take pure luck or a large number of rounds to kill a tank with a howitzer. Those were called destruction missions, and though effective on bunkers, it was a rare tank that would sit around and wait for us to take six rounds to incrementally walk one onto it.
The initial solution was dual purpose improved conventional munitions (DPICM). These put a cluster of bomblets inside the shell which distributed them over the target increasing the chances of a direct hit on an armored vehicle. From a MLRS rocket, each carrying 640 bomblets, they were devastating. But so few could be packed into a 155 round that they were of limited effectiveness from a howitzer.
The next step in evolution was a shell that used laser guidance. These were quite accurate for killing armored vehicles or bunkers, but of course one needs a human with eyes on the target to keep the laser focused on the impact spot to "fly" the round onto it. Also clouds, fog, and dust (particularly in the Middle East) limited the actual battlefield effectiveness of these rounds. The Air Force had the same issues during Desert Storm trying to fly laser guided bombs onto targets.
The real breakthrough came with the miniaturization of GPS so that it could be contained in the fuse of an artillery shell. The most accurate of the new munitions is the Excalibur round which entered service with the US Army in 2007 and was used extensively in Afghanistan and Iraq where the target was typically a specific building or terrain feature. They are being used now by Ukraine to kill Russian armor with one-shot kills.
It generally looks like a normal round, except upon firing, guidance fins deploy. The fins also give it some lift, so that it has a 40 KM (24 mile range). It will hit inside an unclassified 2-5 meter radius of the target grid it was given at that max range. Because it is getting one shot kills on tanks and BMPs you can get a sense of its actual accuracy. The same firing process is used as a regular round, except the digital target location is further passed from the gun's computer to the tiny brain in the shell itself. The gun fires as usual at the target and the on board GPS guidance system flies the shell to the exact designated point. It also tells the shell whether to detonate as a PD (ground), delay, or proximity (3-5 meter high) burst. Obviously target location has to be as accurate as the shell.
I should add, even the towed M777 howitzers like those we have provided Ukraine are equipped with gun computer systems which enable both the use of Excalibur rounds and high accuracy employment of traditional rounds. The Russians, on the other hand, are still almost completely using pre-planned mass fires of Soviet era munitions.
Because of this remarkable evolution in guns and munitions, artillery can carry out its traditional role as well as become the most lethal armor killer on the Ukrainian battlefield. It is why Ukraine has been able to achieve artillery superiority in much of the battle space in spite of only initially having a tenth of Russia's artillery inventory.