Become a super arms dealer with the workshop system

Chapter 153 Designing a Satellite Guidance Suite
"It couldn't be better. After all, seeing is believing. Compared with the northern coastal areas, we really don't know much about the situation in the south of your country." Since Ma Jibu proposed it on his own initiative, Han Feng naturally had no reason not to agree.

"Then I will ask someone to arrange the itinerary after I go back. If there is no accident, I can leave tomorrow or the day after tomorrow." Prime Minister Majib showed a happy expression. Investment contracts, but these are definitely not as reassuring as the factory landing: "In addition, we have arranged for the two of you to have a suite at the Sheraton Pines Hotel."

"Mr. Prime Minister has a heart." Han Feng smiled knowingly after hearing this arrangement.

Albania did spend a lot of thought on these details. The Sheraton Pine Hotel was the first project contracted by China Construction Group in Algeria in the 90s. It took only 35 months to host the 18th OAU Congress. After the completion of the project, Huaxia's construction companies have been occupying a major market share here since then.

Because of the Cypriot passport he has been using, only a few people, including Prime Minister Majib, know the identity of Han Feng Huaxia. This is most likely an arrangement made by the other party himself.

The Maybach soon drove to the gate of the Pines Sheraton Hotel. Majib got off the car and sent Han Feng and Leila inside.

"You two, I won't bother you for the rest of the time. If you have anything to do, you can call me directly. In addition, if you want to take a stroll in Algiers, try to return to the hotel before nightfall."

Generally speaking, as a leader of a country, it is not appropriate to say such things directly. Obviously, the security situation in Algiers is not very optimistic.

Majibu arranged a room for Han Feng and Leila respectively, which made both of them a little relieved. Although the relationship between the two has improved by leaps and bounds since then, it is indeed too fast to say that they share the same bed a little.

After taking a brief shower and taking a nap, Han Feng reopened his laptop.

He had sorted out the basic design ideas of the satellite guidance kit on the plane before, but the system only had a vague concept, and it took a sky-high price of 2 workshop points to complete the entire design. For Han Feng with more than [-] points, it is simply unacceptable.

So as a former electrical engineer, he needs some time to continue to perfect his design.

The reason why the MK82 bomb can be easily transformed into a JDAM is essentially because when the bomb was originally designed, the tail part was a detachable module. It was originally used to replace the MK14/15 deceleration tail to achieve one chicken and two meals. , and later when the satellite guidance technology matures, it is only necessary to replace the original fixed tail with the tail with a movable rudder surface to realize the control of the missile body.

However, since Lucia already has the M53 series of high-resistance aerial bombs, there is no need to consider multi-purpose issues when designing the low-resistance M62 type. In order to facilitate mass production and save costs, the FAB500-M62 missile body is cast entirely After it came out, a certain part of it could not be replaced alone, which was considered an advantage under the conditions of the year, but it was troublesome when it came time to modify it.

Therefore, the idea of ​​this kit designed by Han Feng is actually very simple, that is, to directly abandon the modification of the bomb itself, and design the kit itself to resemble a small plane, with a foldable main wing and three tail fins, capable of independent gliding flight ability, while the bomb is only hung under the kit as a payload, so that not only the FAB500, but actually any bomb can be quickly converted into a satellite-guided weapon through this kit, which is extremely versatile.

"Well, then there is the circuit design of the flight control computer..."

After completing the optimization of the appearance, Han Feng started Altium Designer again. The precision-guided weapon is essentially a controllable aircraft, and it needs to convert the received position information and target information into the control of the rudder surface. A flight control computer is required.

It's just that compared to airplanes, it's relatively simple because of its simple functions and one-time use.

"Considering the cost and the computing speed of the processor, DSP can directly purchase TMS320C6713B from Texas Instruments in batches, which is even cheaper than those made in workshops. It is enough to expand a 1MB program memory externally to accommodate the flight control program software... "

"The flight control computer needs frequent information exchange and control signal output with peripheral equipment. The communication task can be handed over to the FPGA, and the shelf product XC2S200E can also be purchased..."

"FPGA and DSP are linked by address bus, data bus and control bus. The servo control is completed by DSP chip. The output signal adopts 8-channel A/D converter, 100kps sampling rate, 8-bit data bus and EMIF of DSP chip. The lower 8 bits of the interface data bus are connected..."

"A 4-channel D/A converter is enough for the servo feedback input signal. The data line SDI is connected to AFSX0, the input clock CLK is connected to ACLKX0, and the chip select signal is connected to FPGA..."

"The FPGA is connected to the satellite navigation signal module and the inertial measurement unit through the RS232 and RS422 interfaces, and at the same time connected to the fire control system of the Convention Organization aircraft through the 1553B bus, or connected to the fire control system of the Lucia aircraft through the FOCT18977 bus..."

Looking at the complete hardware system framework and circuit structure diagram on the screen, Han Feng rubbed his hands and let out a long breath: "Old Tang, I didn't expect that what you taught me can be used here... ..."

Old Tang was Han Feng's mentor when he was a graduate student before his rebirth.

After the hardware system is designed, it is necessary to design a guidance law that is as simple as possible but with clear effects, mainly to keep the missile's line of sight angle stable in space and keep the line of sight angle rate close to zero.

"First draw a relative motion diagram of the bomb and target, so that the relative motion equations of the bomb can be obtained, and after differentiation, an appropriate state variable can be obtained to obtain a model of an uncertain system."

"Considering that the altitude error of the satellite positioning signal is very large, it is necessary to choose a flight trajectory as steep as possible in the final guidance stage. The trajectory inclination angle at this stage is preferably 90°."

"Then the guidance law becomes a robust control problem..."

When Han Feng finally completed the software and hardware design of the entire guidance module and came out of the working state, the sun was already setting outside the window.

This time, the result of the system evaluation is that 1000 workshop points are needed to perfect the design.

Although there are still a lot, Han Feng's efforts this afternoon have not been in vain. Satellite-guided bombs seem simple, but after all they involve many fields and disciplines. Han Feng has not dabbled in anything except electronic engineering and mathematics. There must be many places that can be optimized in places such as aerodynamic design.

This time he didn't hesitate any longer, and directly chose to spend the workshop points.

The new design is directly generated by the workshop, and can be directly imported into any computer designated by Hanfeng remotely, which is very convenient and fast.

"I'd like to see what these 1000 points have optimized for me..." Han Feng said as he opened the new project file and put it together with his previous design.

"Um……"

It can only be said that it is a system. Although Han Feng thinks that the software and hardware design just now is quite perfect, it has been optimized a lot, especially the new circuit design has reduced the area by about one-third compared with his previous design.

In terms of software, the system has also added a new anti-jamming strategy, which compares the strapdown inertial navigation data sampled by the gyroscope and accelerometer with the data sampled by the satellite positioning system. The former has a higher priority. If there is a large deviation in the navigation signal, the signal will be eliminated. This method can effectively fight against deceptive jamming equipment, but it is still helpless in the face of blocking jamming.

But it was already very good, Han Feng hadn't considered this issue at all before.

Most of the 1000 points were spent on modifying the aerodynamic shape and mechanical structure. Since Han Feng has never been in contact with these fields, the entire design has been greatly modified by the system, thanks to the reduction in hardware size With the optimization of the design of the steering gear, the weight of the whole kit is finally controlled at about 25kg. Considering that it is usually hung on a bomb of at least 500kg, the weight increase of about 5% is almost negligible.

The most expensive part of the whole kit is the five miniature rudder control motors, but they can be produced by workshops, and the cost of mainland products such as DSP and FPGA is only tens of cents. If you choose Beidou/ The NEO-M5L for GLONASS/GPS/Galileo costs about $8, and if you only need to receive GLONASS signals, it is even cheaper to choose Lucia's own MNP-M30...

In short, the cost of the whole set, including labor costs, will not exceed 400 US dollars at most. If it is sold at a price of 2000 US dollars per round, the profit margin will be as high as 400%... Even considering that the workshop cannot always be used to make Motors, and it is impossible for Hanfeng to always transport goods between CAF and Algeria. Including the purchase price of motors, the cost can be controlled at about 1000 US dollars.

perfect!

Han Feng looked at the several engineering documents on the computer and showed a satisfied smile. Next, he only needs to wait for the factory to be established before he can start production directly.

Then he stood up and moved his body. He heard a faint clicking sound from his shoulders. This was an old problem with this body, and it might have been caused by long-term heavy physical work.

The screen of the mobile phone on the side lit up, and it was only at this moment that Han Feng realized that Leila had called him several times throughout the afternoon.

"Why did you go in the afternoon?" As soon as Han Feng called back, Leila's aggressive voice rang out on the phone: "I didn't answer the call, and there was no response when I knocked on your door. I almost contacted Algeria directly." National Security."

"I'm sorry, I've been working just now, and I probably put too much effort into designing the guidance kit that I mentioned on the plane before..." Han Feng wiped the sweat from his forehead and explained quickly.

"Huh—" Leila was more worried than angry just now, and her tone calmed down after confirming that Han Feng was fine: "Although it's a bit late, do you want to go out for dinner before the sun goes down?"

(End of this chapter)