Chinese cruise and anti-ship missiles

Pointblank

Senior Member
In a real crisis betwen USA and china, i dont think you will find much commercial shipping in a war zone. Chances are in fact, you wont find any. Both contenders will order civilian ships away.

another thing: how does the USN know where are the chinese hydrophones?

1. There will be ships still willing to move through the region, so you can't count on merchant ships being gone.

2. Paying attention to what the Chinese are doing... to lay such hydrophones, they will need specialized ships, and the Americans can tail such ships through aircraft and ships. Note the course of such ships, and note any human activity on islands or any artificial structures going up. Since such hydrophone lines need ways to assemble information, knock out the nodes.
 

Engineer

Major
When you confine ships in a small area and they are operating using a set operational area and pattern, then yes, any group of ships can be tracked for significant amounts of time. If a group of ships have the freedom to operate under random and dynamic movement, then the probabilities of one finding said group of ships drops significantly.

Are you replying to the right person? What does this has anything to do with my original statement regarding popeye's post?

Popeye's statement had problems right from the beginning because he implicitly compared China to Iraq. Iraq was and still is a country that has a poorly trained military, with nearly no manufacturing capabilities for military equipments, and nothing in military R&D capability. China is a large country that has a well trained army, and has been manufacturing and doing R&D on weapons system for decades. Claiming that Iraq cannot do it therefore China cannot do it is as ridiculous as me saying US cannot do something while citing Iraq as an example.

If Iraq was able to strike, and by implication, track a CVBG, then China could certainly do it much better. Even if Iraq really had no such capability, that still doesn't mean China cannot track a CVBG. Furthermore, just because none of us know how China tracks a CVBG, that doesn't mean they can't track a CVBG. As an analogy, none of us can design and build a nuclear warhead either, but that doesn't mean China couldn't do it.

The problem is that one can obscure the location by operating close to shipping lanes, but far enough to avoid being visually spotted by civilian ships. This will create false contacts on a hydrophone. If you send satellites to look at such locations, one can hide from them by ducking into cloud cover or weather fronts and courses can be changed since such systems are in known orbits, are predictable, and their sensing capabilities known. To further aid such a deception, deceptive lighting is used at night so that the obvious "blacked out warship" is instead thought to be a merchant or cruise liner.
Your example may be valid when talking about ship-based or submarine-based sensors, where number of sensors is small and the baseline between sensors is short. But for a large scale network intended to monitor an entire ocean, the baseline between sensors would be tens of kilometers to hundreds of kilometers apart. The longer the baseline, the higher spatial resolution the network will have. Also, supercomputers would be used to analyze the data, which are much more powerful when compared to ship-based computers. Picking out military vessels from civilian vessels isn't going to be such a large deal as you made it seem to be.

On the ESM count, surface search radar identical to commercial ones are used. Turn count masking is used by the ships. Aircraft maintenance on the CV and other helo equipped ships is limited to prevent transmissions. So you may have contacts, but you can't tell if the ship is military or a civilian.
Sure you can. Each ship has a unique acoustic signature, so military vessels can be identified from passive sonar. On the EM front, shipborne, airborne space-based, and OTH radars will also be actively searching for the CVBG. Either you switch on ECM and get detected by the returned military frequencies, or you don't switch on ECM and eventually get identified from radar returns. Space-based radar can search large swarth of area and tighten the beam for identification. Using RadarSat as reference, a space-based radar can have up to 5m resolution, enough to generate a 3D model of the carrier for identification. Also, civilian ships don't move in formation at 30kts and have aircraft for escort!

Additionally, don't think the Americans will leave such posts alone; the Americans might choose to level such installations with aircraft or cruise missiles quite easily. Or, they can send special forces to neutralize such locations. Or, they can send submarines to cut your hydrophone lines. In fact, such installations will probably be the first targets destroyed in any war, as you want to blind your enemy's early warning system, followed by his command and control systems.
If American aircraft their special force can get to position before being neutralized, then by all means. I wouldn't put so much faith in their survival in such an attack if I were you. On the other hand, they would most likely having their hands full defending the carrier rather than taking a walk in the park.

As for submarines cutting cables, by all mean do it! It would be no different than telling the other side where the submarine is.
 

Engineer

Major
1. There will be ships still willing to move through the region, so you can't count on merchant ships being gone.
Your scenario seem to hinge on the assumption that there would be hundreds of civilian ships moving along and intermingle with the CVBG. In reality, no dim-wit civilian captain is going to go through an area that is going to start WWIII. The insurance rate for transporting cargos through the region would go all the way into space. Shipping companies aren't going to send the ships because it is no longer profitable.

2. Paying attention to what the Chinese are doing... to lay such hydrophones, they will need specialized ships, and the Americans can tail such ships through aircraft and ships. Note the course of such ships, and note any human activity on islands or any artificial structures going up. Since such hydrophone lines need ways to assemble information, knock out the nodes.
Easily defeated by going around in circles and planting dummy structures. The former has been done by China in the 80's when they were heading to retrieve their DF-5 test warhead from the Pacific.
 
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Lezt

Junior Member
I think that what is forgotten is that we are not tracking a single CV, but a CVBG.

I would think that a CVBG going at 25 knots consisting of a few CVN, a dozen or so DD and more support vessel will generate a rather unique and loud noise signature that civilian ships can match unless they are in a convoy. this greatly reduces the sonar contacts worthy to look at for a ASBM attack.
 

Pointblank

Senior Member
Popeye's statement had problems right from the beginning because he implicitly compared China to Iraq. Iraq was and still is a country that has a poorly trained military, with nearly no manufacturing capabilities for military equipments, and nothing in military R&D capability. China is a large country that has a well trained army, and has been manufacturing and doing R&D on weapons system for decades. Claiming that Iraq cannot do it therefore China cannot do it is as ridiculous as me saying US cannot do something while citing Iraq as an example.
The Iraqi's have a well developed command and control ability. They needed this ability as the Iraqi military was very centralized.

If Iraq was able to strike, and by implication, track a CVBG, then China could certainly do it much better. Even if Iraq really had no such capability, that still doesn't mean China cannot track a CVBG. Furthermore, just because none of us know how China tracks a CVBG, that doesn't mean they can't track a CVBG. As an analogy, none of us can design and build a nuclear warhead either, but that doesn't mean China couldn't do it.

Like I said, different situation. The Iraqi's could track a carrier group that was operating in a confined space with limited room to manoeuvrer. This narrows a search area significantly. If you have the open seas to manoeuvrer, and freedom to go wherever you want, the chances of finding a carrier group drops significantly.

Your example may be valid when talking about ship-based or submarine-based sensors, where number of sensors is small and the baseline between sensors is short. But for a large scale network intended to monitor an entire ocean, the baseline between sensors would be tens of kilometers to hundreds of kilometers apart. The longer the baseline, the higher spatial resolution the network will have. Also, supercomputers would be used to analyze the data, which are much more powerful when compared to ship-based computers. Picking out military vessels from civilian vessels isn't going to be such a large deal as you made it seem to be.


Sure you can. Each ship has a unique acoustic signature, so military vessels can be identified from passive sonar. On the EM front, shipborne, airborne space-based, and OTH radars will also be actively searching for the CVBG. Either you switch on ECM and get detected by the returned military frequencies, or you don't switch on ECM and eventually get identified from radar returns. Space-based radar can search large swarth of area and tighten the beam for identification. Using RadarSat as reference, a space-based radar can have up to 5m resolution, enough to generate a 3D model of the carrier for identification. Also, civilian ships don't move in formation at 30kts and have aircraft for escort!

Doesn't matter. And it is not possible to definitively say a passive sonar contact is positively military, and is hostile.

Broad surveillance systems are known so any detection method is countered either by denying sensor information, misleading, or providing expected results consistent with something else. ESM systems rely on active emissions from radars or communication systems. So nothing is radiated. Overhead systems are in known orbits, are predictable, and their sensing capabilities known. So the track is varied, weather is sought out to hide in when vulnerable, blending into sea lanes (while staying out of visual detection range of ships) and such techniques. Deceptive lighting is used at night so that the obvious "blacked out warship" is instead thought to be a merchant or cruise liner. Surface search radar identical to commercial ones are used. Turn count masking is used by the ships. Aircraft maintenance on the CV and other helo equipped ships is limited to prevent transmissions. Military ships can operate under various EMCON states, and warships are carefully designed to ensure that there is no stray emissions.

In NORPAC 82 using these and other tactics the ships of the USS Midway carrier group operated close enough to support each other, but far enough and randomly dispersed to avoid identification by anyone. In one night in bad weather a man went overboard when the group was within 200nm of a Soviet airfield in the Kuril Island chain. Despite launch of helicopters and active search methods by several ships in the successful SAR, including clear voice UHF transmissions, the force is not detected because no Soviet asset was above the radar horizon. No overhead system was cued. The force continued on, undetected.

Much of the process of targeting is determining which of the many contacts detected is the one you are looking for. Most techniques rely on exploiting the Achilles heel of radar and communication. To work, you have to transmit, and by transmitting you tell the opposition who and where you are. Don't transmit, and he has to find you the hard way, by visually searching the vast ocean area 10sqnm at a time. If the opposition is going to search with active sensors such as Radar, he is also telling you where he is and who he is. So fighters and strike aircraft can run out the ESM line of bearing and bag the asset before it has a chance of detecting the task force.

If American aircraft their special force can get to position before being neutralized, then by all means. I wouldn't put so much faith in their survival in such an attack if I were you. On the other hand, they would most likely having their hands full defending the carrier rather than taking a walk in the park.

As for submarines cutting cables, by all mean do it! It would be no different than telling the other side where the submarine is.
The Americans have lots of options in neutralizing point positions. Don't forget the large numbers of Tomahawk cruise missiles that have a range of 2,500km. Practically every surface and subsurface combatant aside from the frigates and carriers have Tomahawk missiles. Not to mention the vast amounts of stand-off weapons available to the US aircraft, such as the JASSM and SLAM-ER.

And we are assuming that there will only be one carrier group; the Americans in large conflicts close to the sea operate multiple carrier groups in the region, coupled with other surface groups. For example, Pearl Harbour has a major group of cruisers, destroyers and frigates that are not attached to a carrier group. Not to mention the availability of the LHD's and LHA's with their flat tops of VSTOL fighters.

And BTW, we were very effective in our ability to cut submarine cables or tap them without being detected during the Cold War. And that was with the Soviet-style bastion ASW defence, where the Soviets flooded certain areas with ASW assets.

Your scenario seem to hinge on the assumption that there would be hundreds of civilian ships moving along and intermingle with the CVBG. In reality, no dim-wit civilian captain is going to go through an area that is going to start WWIII. The insurance rate for transporting cargos through the region would go all the way into space. Shipping companies aren't going to send the ships because it is no longer profitable.
Despite this, civilian and neutral shipping will still be in the area. You can't assume that if you declared a war and a exclusion zone, there will be no neutral shipping in the area. So you have to visually identify and verify your targets otherwise you cannot commit assets.

Easily defeated by going around in circles and planting dummy structures. The former has been done by China in the 80's when they were heading to retrieve their DF-5 test warhead from the Pacific.
Despite this, if we are able to partially disable various sections of the sensor grid, you have holes in coverage. Remember, bombs are cheap. The Iraqi's had an advanced air defence system, and we blew large gaping holes into their early warning system on the first night of Desert Storm.

I think that what is forgotten is that we are not tracking a single CV, but a CVBG.

I would think that a CVBG going at 25 knots consisting of a few CVN, a dozen or so DD and more support vessel will generate a rather unique and loud noise signature that civilian ships can match unless they are in a convoy. this greatly reduces the sonar contacts worthy to look at for a ASBM attack.

Ships in a CVBG never operate in close proximity to each other. Warships are dispersed over a broad area to ensure any detection system does not see the classic "bullseye" formation made famous in countless Public Affairs shots, which is never used in operations. As such, carrier may never see her escorts while on operations.
 

Lezt

Junior Member
Ships in a CVBG never operate in close proximity to each other. Warships are dispersed over a broad area to ensure any detection system does not see the classic "bullseye" formation made famous in countless Public Affairs shots, which is never used in operations. As such, carrier may never see her escorts while on operations.

No, I am not assuming that they are sailing in a typical PR fashion. lets think about it. If a CVBG is sailing in hostile water where the enemy is known to be able to resist it with attack subs, surface vessels, anti ship missiles and aircraft, how disperse can a CVBG be before they lose cohesion and mutual support? Also, technically, if the Chinese is out to sink American ships, does it matter if the ASBM is used to sink a destroyer or a carrier?

Also F/A-18 have a combat radius or around 750 km, so the carrier will have to be as close as 750 km to the coastline to strike at Chinese land assets via strike aircraft or provide air cover. If it is a stand off situation with tomahawks then is a different story - then we need to question why the CV was sent or how much damage can several hundred tomahawk can go through the Chinese defenses. So in the traditional sense, the carrier will have to be close to the Chinese shores.

lets say an Arleigh Burke class destroyer, based on accessible info on the net they are armed with weapons which can give mutual defense is:
SM-2 170 km range,
SM-3 500 km range,
Harpoon 350 km range,
Sea Sparrow 50+ km range,
guns,

Lets establish how dispersed the CVBG can be, say the fleet is prepared for ASBM attacks with terminal velocity of Mach 10+. for argument sake, lets say average Mach 7? Lets assume the missile is flying at 36000 ft, where 1 mach = ~300 m/s for a flight time of ~5 minutes if the launch site is 800 km away from the carrier.

Assuming that the Arleigh Burke detects, identifies and launches a SM-2/3 within a minute to intercept. Assuming the interceptor missile is traveling with a terminal velocity of mach 4+, so lets say an average of mach 3, it has 4 minutes to get to the missile. this will give an engagement range of ~200 km.

which is within the range of the SM3 but not the SM2. So techically the maximum distance two furthest ship can be away is 200 km if the ASBM is to be intercepted directly at the ship. I do doubt any sensible American commander will spread his ships that wide and let his CV sail alone in a sea infested with Chinese assets - such as strike aircraft, mines, homing mines, SSNs, SSKs, etc.


A 100 km radius is not particularly large to hide a CVBG especially if it is launching aircraft. If Sosus can hear a tiny soviet sub during the cuban missile crisis with the US battle fleet chucking up water above in the 70s. I doubt a modern Chinese version will have issues locating carriers.
 

Engineer

Major
The Iraqi's have a well developed command and control ability. They needed this ability as the Iraqi military was very centralized.

Completely irrelevent. Whether Iraq had command and control ability does not invalidate the statement that they had a poorly trained military, with little manufacturing capabilities for military equipments, and no R&D capability. No R&D capability means they cannot develop new methods to track a CVBG. And whether Iraq had command and control ability is also not an indication as to whether China can or cannot track a CVBG.


Like I said, different situation. The Iraqi's could track a carrier group that was operating in a confined space with limited room to manoeuvrer. This narrows a search area significantly. If you have the open seas to manoeuvrer, and freedom to go wherever you want, the chances of finding a carrier group drops significantly.

Again, irrelevant.

First, whether Iraq could actually track a CVBG in the first place is a big question. Assuming they could, you would be right in saying they would have had a much harder time finding the CVBG in the open ocean. However, it is still not an indication of China's ability or lack thereof and my argument still stands.

Second, achieving what Iraq did back then would be as relatively easy as lifting a finger for China today. By extension, a task which is extremely challenging to the Iraqi's is a whole lot easier for China to tackle. Something which Iraq could not achieve does not imply China cannot do it.

You can throw another thousand examples citing what Iraq could not do, they will still be irrelevant and my argument will still stand.


Doesn't matter. And it is not possible to definitively say a passive sonar contact is positively military, and is hostile.
I think you imagined me to claim that all sources of noise in the area are military in origin, whereas my original statement involved the use of acoustic signatures to identify military vessels.

ASW by ships and helicopters can isolate the noise of a submarine from those of friendly ships and pinpoints the sub's exact location. Your scenario where the network being so lousy to the point of not able to pick out military vessels from normal civilian activities is simply preposterous and will not happen. And this won't change just by waving your hands in the air and say "it doesn't matter".

Broad surveillance systems are known so any detection method is countered either by denying sensor information, misleading, or providing expected results consistent with something else. ESM systems rely on active emissions from radars or communication systems. So nothing is radiated. Overhead systems are in known orbits, are predictable, and their sensing capabilities known. So the track is varied, weather is sought out to hide in when vulnerable, blending into sea lanes (while staying out of visual detection range of ships) and such techniques. Deceptive lighting is used at night so that the obvious "blacked out warship" is instead thought to be a merchant or cruise liner. Surface search radar identical to commercial ones are used. Turn count masking is used by the ships. Aircraft maintenance on the CV and other helo equipped ships is limited to prevent transmissions. Military ships can operate under various EMCON states, and warships are carefully designed to ensure that there is no stray emissions.

In NORPAC 82 using these and other tactics the ships of the USS Midway carrier group operated close enough to support each other, but far enough and randomly dispersed to avoid identification by anyone. In one night in bad weather a man went overboard when the group was within 200nm of a Soviet airfield in the Kuril Island chain. Despite launch of helicopters and active search methods by several ships in the successful SAR, including clear voice UHF transmissions, the force is not detected because no Soviet asset was above the radar horizon. No overhead system was cued. The force continued on, undetected.

Much of the process of targeting is determining which of the many contacts detected is the one you are looking for. Most techniques rely on exploiting the Achilles heel of radar and communication. To work, you have to transmit, and by transmitting you tell the opposition who and where you are. Don't transmit, and he has to find you the hard way, by visually searching the vast ocean area 10sqnm at a time. If the opposition is going to search with active sensors such as Radar, he is also telling you where he is and who he is. So fighters and strike aircraft can run out the ESM line of bearing and bag the asset before it has a chance of detecting the task force.

If you are going to copy from
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, at least do it right and provide a reference. Copy and pasting paragraphs as your own words is plagiarizing, and it doesn't mean you know what you are saying.

Practically all the arguments involving ESM so far assumes the opponent is afraid to use active search and had to rely on visual identification. In the case of China that's just not going to happen. Furthermore, US can use ESM but China can also do so along with active searches. US can use deceptions to hide its fleets, but there is nothing to prevent China to use ruses by "misleading, or providing expected results consistent with something else" to give the CVBG a false sense of security either.

The Americans have lots of options in neutralizing point positions. Don't forget the large numbers of Tomahawk cruise missiles that have a range of 2,500km. Practically every surface and subsurface combatant aside from the frigates and carriers have Tomahawk missiles. Not to mention the vast amounts of stand-off weapons available to the US aircraft, such as the JASSM and SLAM-ER.

The threat of crusise missiles has been known for decades, and methods have been actively researched to deal with this problem. Today, these missiles will have to deal with air defense just as their aircraft counterpart would. If you want to talk about missiles, then you might want to focus your attention on hundreds of MRBMs and thousands of cruise missiles that will be heading toward US bases in the region.

And we are assuming that there will only be one carrier group; the Americans in large conflicts close to the sea operate multiple carrier groups in the region, coupled with other surface groups. For example, Pearl Harbour has a major group of cruisers, destroyers and frigates that are not attached to a carrier group. Not to mention the availability of the LHD's and LHA's with their flat tops of VSTOL fighters.

So? They will still be subjected to the same amount of defenses. And with every additional ship, with every additional aircraft in the sky, the chance of being detected increases. These ships aren't going to be useful unless they get within range of China coastlines, and they can't get into range without getting detected and risk being sunk.

And BTW, we were very effective in our ability to cut submarine cables or tap them without being detected during the Cold War. And that was with the Soviet-style bastion ASW defence, where the Soviets flooded certain areas with ASW assets.

Soviet-style ASW defense is not the same as a detection network like SOSUS. To cut cables within a hydrophone network is like trying disconnecting cameras from a room filled with survillence cameras. It may not be impossible, but it would be extremely difficult. And just like the operator would see statics when you disconntected a camera, the monitoring stations of a hydrophone network would see sensors going offline thus alerting them that someone is severing the cables. There is an issue of locating the hydrophones and their cables in the first place.

Despite this, civilian and neutral shipping will still be in the area. You can't assume that if you declared a war and a exclusion zone, there will be no neutral shipping in the area. So you have to visually identify and verify your targets otherwise you cannot commit assets.

Nope. Waving your hands in the air and saying "in the area" means absolutely nothing. If there is a usual number of civilian ships, they are going to be kept outside the perimeter of a CVBG, thus putting enough distances between the CVBG and civilian ships for a hydrophone network to differentiate the two. However, there isn't going to be a usual amount of civilian activities within a war zone. Claiming otherwise and asserting that the opponent must visually identify its targets is as absurd as saying soldiers have to shoot carefully because there are candy stalls in the middle of no-man land.

Despite this, if we are able to partially disable various sections of the sensor grid, you have holes in coverage. Remember, bombs are cheap. The Iraqi's had an advanced air defence system, and we blew large gaping holes into their early warning system on the first night of Desert Storm.

Nope. You will have a degraded sensor grid, not holes. Sonar, and by extension hydrophone network works by triangulation. Triangulation requires a minimum of three hydrophones. Of course there need to be more of them in a real-world application. In any case, if there are hundred hydrophones and you manage to cut fifty of them, the resolution of the network and the fidelity of the data will decrease, but you still wouldn't get a blind spot.

Also, you do know we are discussing an undersea hydrophone network, right? How you imagine bombs and cruise missiles would take out undersea sensors is beyond my comprehension.

As to what Iraq had during Desert Storm, it is completely irrelevant.

Ships in a CVBG never operate in close proximity to each other. Warships are dispersed over a broad area to ensure any detection system does not see the classic "bullseye" formation made famous in countless Public Affairs shots, which is never used in operations. As such, carrier may never see her escorts while on operations.
And precisely because ships in a CVBG is spread out, that's why a hydrophone network will be able to pick out the military vessels.
 
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cloyce

Junior Member
SM-3-warhead.jpg


SM-3 employes an Exoatmospheric warhead.
It's kinetic warhead does not have the aerodinamic shape to fly under the atmosphere, it will break apart!

What US Navy needs is the Naval version of THAAD, which is designed to intercept ballistic warhead in the reentry phase.

Missile_Defense_Interceptor_Basics.png
 

Lezt

Junior Member
Cloyce,

The ASBM I am refering to is the DF21 MRBM missile for anti ship use. Therefore I believe the SM-3 can intercept it as it is also an extra-atmospheric missile?
 

Pointblank

Senior Member
Sonar, and by extension hydrophone network works by triangulation. Triangulation requires a minimum of three hydrophones. Of course there need to be more of them in a real-world application. In any case, if there are hundred hydrophones and you manage to cut fifty of them, the resolution of the network and the fidelity of the data will decrease, but you still wouldn't get a blind spot.

Also, you do know we are discussing an undersea hydrophone network, right? How you imagine bombs and cruise missiles would take out undersea sensors is beyond my comprehension.

As to what Iraq had during Desert Storm, it is completely irrelevant.

The problem is that most hydrophone lines need to meet up at hubs and monitoring stations otherwise there will be an immense amount of cabling needed to run, plus high amounts of maintenance needed. Knock out hubs and you knock out large areas of the sensor grid. The Iraqi's during Gulf War I had a vast fibre optic communications grid laid across the Iraqi desert. From good intelligence work, we managed to find a number of the hubs and they were targeted by Allied aircraft and missiles. The result was that the Iraqi's had large holes in coverage of their fibre optic grid. As a result, the Iraqi's were forced to communicate via radio, which is easily intercepted, and jammed.

Soviet-style ASW defense is not the same as a detection network like SOSUS. To cut cables within a hydrophone network is like trying disconnecting cameras from a room filled with survillence cameras. It may not be impossible, but it would be extremely difficult. And just like the operator would see statics when you disconntected a camera, the monitoring stations of a hydrophone network would see sensors going offline thus alerting them that someone is severing the cables. There is an issue of locating the hydrophones and their cables in the first place.

We know very well that SOSUS was very vulnerable as a detection system. During the Cold War, the SOSUS system was very frequently damaged by civilian activities such as trawling. In fact, there were accusations levelled by the US against the Soviets as the Americans believed that the Soviets intentionally cut the lines. With the high amount of fishing activity in the East China Sea, A Chinese SOSUS system will be damaged frequently by trawlers, which will necessitate frequent and expensive repairs.

As SOSUS had to be laid by cable ships, sudden manoeuvres or major deviations of course while laying the cable is impossible. As a result, the Soviets tailed the laying of the SOSUS line with naval and research ships, and they observed our activities very closely. As a result, they knew where our lines were.

Additionally, SOSUS had to be cued in order to detect ships and submarines. It had to know what to look for, when, and approximately where. We did this through the use of a couple high powered HD/DF stations in a number of countries, signals interception stations in Norway, Norwegian intelligence collection ships, and reconnaissance satellites. In the Pacific, we had assistance from the Japanese in establishing HD/DF stations, signals interception stations, and of course, intelligence ships. In short, we had to know when Soviet ships and submarines were planning to sortie, and the expected route the Soviets planned on making. We also at times could crack into Soviet code so we could read the orders sent to the subs. The Chinese lack most of these capabilities.

Furthermore, not all attempts at tracking Soviet submarines were successful with SOSUS. Often, Soviets subs were just never detected by SOSUS in the first place, or if they were detected, we lost track of the submarine.
 
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