Chapter 620 Another confrontation with Annan Navy

Looking at the positioning results on the satellite navigation terminal, Ruan Yingjun's whole brain stopped for a moment.

Mainly to highlight a confusion.

In fact, under normal circumstances, for surface ship units like them, no one would look at that altitude data at all.

Everyone is sailing on the sea, so it’s all 0 anyway.

There is an error of about plus or minus 30 meters at most.

Because satellite positioning is not suitable for height measurement in principle, so this is normal.

But today's 350 meters is really too dazzling and it's hard not to notice.

It's basically equivalent to saying they are sailing a ship in the sky.

"Captain Ruan?"

The reporter looked at Ruan Yingjun, who seemed to be frozen in place, and shouted softly again.

Although the GPS positioning terminal on the Pham Ngu Lao is not the most advanced military terminal that can receive P codes, it is not a commercial product that can be bought anywhere. It was specially purchased from the United States for refitting ships after the relationship between the two countries warmed up.

The operation interface is naturally all in English, and there are a lot of abbreviations.

Therefore, an ordinary reporter naturally cannot understand the interface, but needs the captain to introduce it.

After being called out suddenly, Ruan Yingjun almost froze.

He felt like he had seen a ghost today.

This interview is very important to the entire Pham Ngu Lao fleet.

If everything goes well, many people will be promoted after returning.

Therefore, he took two deep breaths and replied calmly:

"Wait a minute, let me refresh the positioning data."

As he said that, he quickly started working and restarted the positioning terminal with anxiety.

And at the same time.

In the mid-air dozens of kilometers away, Tang Yiping's No. 01 aircraft returned to its original position near the Shenhu Sands after making a large circle, and then lowered its altitude again, preparing for the second round of testing.

Before entering the test airspace, he followed the process determined before takeoff, pressed two buttons next to the multi-function display, and adjusted the working mode of the "soft-kill self-defense countermeasure system" from mode 3 to mode 4.

The former focuses on interfering with altitude data. The advantage is that it will not affect the plane path of the interfered object, so it cannot detect any abnormalities by the general path integration algorithm. However, the price is that it can only deal with lower-cost satellite-guided bombs.

Most of the more advanced cruise missiles also have radio altimeters themselves, and will not simply adjust their altitude and ultimately crash because of errors in the altitude signal provided by the GPS.

The latter interference algorithm directly targets plane position data.

Moreover, in order to avoid differences being detected by the inertial navigation system, the target's position information will not be changed immediately when interference first begins. Instead, errors will continue to accumulate as the interference continues, causing the ammunition's path to deviate.

This interference algorithm is obviously very complex, so it needs to maintain stable interference for a long time to be effective. If it is only used at the end, the effect will not be too obvious.

For this reason, in addition to observing the interference effect on the missile, this round of testing also depends on whether the pod's heat dissipation and power supply can maintain continuous operation for a long time, and whether it can target roughly the same current area under different postures of the aircraft. .

It takes more than half an hour in total.

Fortunately, the two auxiliary fuel tanks under the wings can provide sufficient fuel, so there is no need to worry about insufficient range.

As for Mode 1 and Mode 2, they are a mixture of the above two modes, but they require an external computer with sufficient performance to support sufficient computing power, which is not within the scope of today's test.

After entering the test airspace in mode 4 this time, the accompanying JH-7 quickly observed that the three target missiles did not continue flying northeast in the original direction, but turned northwest, and the deviation angle gradually increased.

If it is an actual combat, it means that these missiles have completely lost their effect.

With such a large route deviation, as long as it continues to fly for a while, even if the interference disappears later, the GPS data will suddenly drift back to the correct position and the guidance system will consider it to be a route error and self-destruct.

……

However, when such an interference effect occurs on the Pham Wulao ship dozens of kilometers away, it looks like a completely different situation.

After Captain Ruan Yingjun restarted the GPS navigation equipment, the altitude data that had just been displayed as 350 meters indeed changed to +5m.

Within the normal error range.

The longitude and latitude are not much different from before the restart.

"call……"

He finally breathed a sigh of relief.

Sure enough, restarting can solve more than 95% of electronic equipment failures.

"This is our newly equipped navigation and positioning terminal. Just follow its route prompts while driving. The current celestial positioning is basically only used as a backup, just in case the equipment fails..."

Ruan Yingjun, who recovered from the panic, wiped the sweat from his forehead, turned around and introduced to the reporters behind him.

Having said that, it has indeed been a while since he actually used a sextant for navigation and positioning.

After all, not only is this thing troublesome to use, it also has to look up the equatorial coordinates of the corresponding celestial body, which takes a lot of time to operate.

"I see……"

The reporter who didn’t understand the navy just recorded the captain’s introduction in his notebook:

"Then next, I need to take a set of photos of the captain personally taking the helm..."

While he was talking, other media personnel accompanying him had begun to set up cameras.

"I'll be at the helm myself?"

Ruan Yingjun was stunned.

The captain personally takes the helm, which is basically a practice only in the sailing battleship era.

On modern ships, even ships with the technical level of the 60s such as Pham Ngu Lao, there will be a dedicated steering team, and the captain is only responsible for issuing command commands.

Although the captain must have received steering training, unless he is from the steering class and specializes in this, such as Masamichi Terauchi (captain of Yukikaze) or William Tennant (captain of Repulse), there is almost no technical training. Maybe compared to a dedicated helmsman.

But on the other hand, he also knew that ordinary people and senior leaders who watched Annan TV news reports most likely did not know about this.

So it might make sense in terms of publicity…

Moreover, sailing on the high seas and oceans, with the support of the navigation system, is it possible that there will still be problems?

So, after weighing it a few times, he nodded:

"Okay, but according to the regulations, I can't leave the command position for a long time, so I only need to shoot a section."

With that said, he took the steering wheel from the operator.

Pham Ngu Lao is only classified as an "escort" in the Red Navy. Due to its small size, it is not very difficult to operate. In addition, the weather is clear today and the waves are high. Therefore, Ruan Yingjun even has extra energy to answer questions from reporters from time to time. .

But while driving, Ruan Yingjun felt that something was wrong.

The GPS navigation system kept prompting that the navigation direction was deviating, and he had just been adjusting the course according to the navigation display.

"Has my ship maneuvering skills deteriorated to this extent?"

Ruan Yingjun couldn't help but start to doubt his own level.

After all, it has been many years since I really got started.

But even so, you can’t even control the ship to run in a straight line...

Or is there something wrong with the steering gear system, causing the steering gear to have a deviation angle when the steering wheel is in the middle?

Various possibilities flashed through the captain's mind.

However, the open bridge and the hot weather near noon in the equatorial region in June made it difficult for him to think calmly, so he just continued to drive forward according to the GPS navigation data for the time being.

He subconsciously looked up at the sky, but celestial navigation during the day could only look at the sun. However, near the equator, the accuracy of positioning based on the sun was very poor...

What's more, there are reporters and cameras nearby. If he runs out to use the sextant at this time, it seems that he is very incompetent as a captain.

At this tangled moment, the pictures and numbers displayed on the navigation system suddenly began to jump crazily.

Then an error was reported directly, and a bunch of garbled codes appeared.

"What a hell today...what's going on?"

Ruan Yingjun felt that God seemed to be against him.

The GPS, which has never had any problems in the past few years, has failed at this critical time today.

If he makes a fool of himself in the Annan News report, then his next promotion may be far away...

"Sure enough, I still can't trust those Americans too much..."

After complaining in his mind, he could only resort to the old method of restarting.

By the way, I had to keep chatting with the reporter to prevent the other person’s attention from being diverted to the anomalies in the navigation system.

But secretly, Ruan Yingjun already felt that this voyage would not go smoothly.

After a few minutes, the GPS connected to the satellite signal again.

However, data reappeared on the screen showing that the ship was now heading northeast instead of southeast.

The position also deviated by about 20 nautical miles from before the restart.

This means that he is now approaching waters that are not actually controlled by Annan.

"?"

Ruan Yingjun felt that he couldn't hold himself any longer.

He was clearly performing an ordinary transportation mission, so why did he end up here inexplicably?

"Report to Captain!"

A report suddenly came from the lookout post on the bridge:

"In the direction of 295, about 10 nautical miles away, there is an unknown type of ship flying the Chinese Navy flag!"