Russia introduces Soyuz-MS
After nearly half a century of orbital missions, Russia's veteran transport spacecraft got another upgrade with the Soyuz-MS version (also know as Series 730). The first mission of the Soyuz MS spacecraft began on July 7, 2016. The spacecraft carried a crew of three to the International Space Station, ISS. Soyuz-MS will supercede the Soyuz-TMA-M variant (Series 700).
Key new external features of the Soyuz-MS variant.
The work that never stops
Even before the introduction of the Soyuz TMA-M variant in October 2010, Russian engineers had already had a long list of upgrades, which did not make it into then new version, but had to be implemented at a later date. Many of these improvements were dictated not so much by a desire to improve the spacecraft itself, but by the need to replace obsolete components which were going out of production or had to be imported from outside Russia, primarily from Ukraine.
As of 2010, the "wish list" of future upgrades included following new systems:
In addition, the Soyuz was expected to receive extra thrusters for the rendezvous and orientation system (dvigately prichalivaniya i orientatsii, DPO-B) and the associated avionics unit (Blok Avtomatiki, BA DPO) would be upgraded to reflect that change.
The SSVP docking port aboard Soyuz would receive backup electric motors.
The new and upgraded systems also required a number of changes in associated systems, such as the Motion Control System, SUDN; the Onboard Equipment Control System, SUBK; Communications System, STR; and the Rendezvous Radio System, RTS.
On the request from NASA, Russian engineers also developed an Additional Anti-meteoroid Shielding or DPM, for the Habitation Module, BO, of the Soyuz spacecraft.
Finally, various improvements in electricity-generating solar panels were also under consideration.
First flight-worthy Soyuz MS spacecraft during processing in Baikonur.
According to early plans, most extras which could not make into the Soyuz TMA-M upgrade in 2010, could be introduced step-by-step into the future production versions of the TMA-M variant. As of 2010, RKK Energia hoped to complete the upgrades in just two and a half years. (566)
In November of that year, the Interfax news agency quoted the following timeline for three key features of the upgrade program:
At the time, as many as 18 various replacements and design changes had been planned for the Soyuz TMA-M spacecraft:
In reality, the effort to upgrade Soyuz TMA-M took six years to complete.
Eventually, most of the planned upgrades were consolidated into a single program for both Progress cargo ships and Soyuz transport vehicles. The project became known as Progress-MS or Soyuz-MS respectively, where MS stood for "modernized systems." As in many previous upgrades, the new features would be first tried on unmanned cargo ships before their certification for use in piloted vehicles. In addition, many of the improvements for the MS series could later be directly incorporated or otherwise benefit the development of the next-generation transport ship, PTK NP.
During the Moscow Air and Space Show in 2011, the head of RKK Energia promised to complete upgrades for the MS series by the end of 2013 or beginning of 2014. However by 2012, the first launch of the Soyuz-MS spacecraft (No. 731) slipped to the first half of 2015, following the first test flight of the Progress-MS (No. 431) planned in the second half of 2014. Later, various delays eventually pushed the first Soyuz-MS mission into 2016.
During 2013, RKK Energia developed and produced documentation for the Soyuz-MS spacecraft. The company also began manufacturing components and developed blueprints for the integrated electric test stand, KS, for the modified spacecraft. The company also built a common container for transporting both Progress-MS and Soyuz-MS vehicles and prepared for its testing. The ground test program also called for the development of a dynamic prototype of the Soyuz-MS.
Beginning in 2017, the Soyuz-MS was expected fully replace the Soyuz TMA-M spacecraft. According to Russian officials, some of the planned upgrades would still be implemented after the launch of the first Soyuz-MS.
An integrated simulator, KS, of the Soyuz-MS spacecraft at RKK Energia's checkout and testing station, KIS.
SOYUZ-MS UPGRADED SYSTEMS:
SUDN flight control and navigation system
Most significant upgrades within the Soyuz-MS series dealt with various components of the Flight Control and Navigation System, SUDN, (from Russian Sistema Upravleniya Dvizheniem i Navigatsii).
ASN-K satellite navigation system
To measure orbital parameters of the Soyuz and Progress spacecraft, the ships' Flight Control and Navigation System, SUDN, relied on the 38G6 transmitters communicating with six Kama ground stations and Kvant-P ground terminals. By 2010, all these facilities and hardware was marked for retirement and was to be replaced with the ASN-K satellite navigation system, which could simultaneously use GPS and the GLONASS navigation satellites. The system would allow autonomous trajectory measurements by the ship's computers without reliance on ground stations.
According to RKK Energia, which developed the system, the ASN-K consists of four antennas, which are mathematically linked to a single virtual system, enabling to conduct uninterrupted navigation measurements independent from a particular orientation of the spacecraft in space. The system provides positioning accuracy within five meters. The ship's attitude (orientation in space) is determined with an accuracy of 0.5 degrees. During a rendezvous, relative coordinates can be determined within one meter and there are hopes to improve the accuracy to just three or four centimeters.
The ASN-K system was first flown on the Progress-M-25M cargo ship in October 2014. Additional tests in support of the ASN-K development were also conducted on the ISS. In April 2016, RKK Energia declared flight testing of ASN-K completed. According to RKK Energia, the new system is five or six times cheaper than its foreign counterparts thanks to the transfer of many functions from hardware to software.
Along with its use on the MS series, RKK Energia promised to install the ASN-K equipment on the next-generation transport ship, PTK.
To reach its destination in the Earth's orbit, all spacecraft of the MS series, including Soyuz-MS and Progress-MS will be equipped with the new Kurs-NA rendezvous system. It replaced the Kurs-A system, which was in use since 1986 and employed key components built at the Kiev Radio Plant in Ukraine. To end dependency on foreign suppliers, the production of the new Kurs-NA system was consolidated at the Izhevsk Radio Plant in Russia.
The placement of the 28 attitude control thrusters, DPOs, which are part of the Integrated Propulsion System (Kombinirovannaya Dvigatelnaya Ustanovka, KDU) was rearranged on Soyuz-MS to provide full redundancy between the two independent propellant loops.
Angular velocity sensors
The production of the angular velocity sensors, BDUS-3M (for Blok Datchikov Uglovykh Skorostei), which were used by the flight control system were to be discontinued after 2011. Instead, modified sensors, designated BDUS-3A, were first flight-tested on Progress-MS-01 spacecraft and were then certified for the use on Soyuz-MS.
Motion and Orientation Control Avionics, BUPO
A number of avionics went out of production in the Motion and Orientation Control Unit, BUPO, (from Russian Blok Upravleniya Peremesheniem i Orientatsiei). It was replaced with the new digital control unit dubbed Blok Upravleniya Rezervnym Konturom, BURK, which can be translated as the Backup Loop Control Unit. Developed at RKK Energia, the new avionics system was first tested on Progress-MS.
The existing Kvant-V radio-command system, BRTS, (which stands for Bortovaya Radio-tekhnicheskaya Sistema) developed at AO RKS became obsolete, primarily because it had no ability to communicate via satellites. As a result, Soyuz was able to contact mission control and receive commands only within direct view of ground stations on the Russian territory.
Klest-M TV system
A new digital television system, TVS, which replaced an older Klest (crossbill) analog TV, allows transmission between the transport ship and the space station via onboard radio channels.
According to TASS, the new system uses MPEG-2 encoding and promises to improve TV image quality thanks to make the transmissions less susceptible to interference.
As before, the new television system will provides footage from the inside of the spacecraft as well as images from an external camera in the front of the vehicle, which are available to Soyuz pilots and to mission controllers during docking.
In addition to its original function, on Soyuz-MS the TV system can be integrated into the rendezvous process to facilitate the guidance of the spacecraft toward its target. The Kurs-NA automated rendezvous system was designed to be activated at a distance of around of 150 kilometers from the station and provide coordinates of the station to the Soyuz's flight control system and its crew. Then, a distance of 80 kilometers, comes the activation of the TV system, which can now beam images between both vehicles participating in the rendezvous, which should help in determining mutual coordinates between the transport ship and its destination. (783)
Location and communications system
The descent module of the Soyuz-MS was equipped with the modern Kospas-Sarsat transmitters and GPS/GLONASS navigation systems to help rescue services to determine the capsule's position during the descent and after landing. A special GPS receiver was placed on the hatch of the descent module to enable the capsule to determine its position during the parachute descent. Then, the Kospas-Sarsat transponder within the radio system sends that location to the mission control in Korolev.
Testing of this system was conducted during two missions of the Soyuz spacecraft in 2011. According to ISS Reshetnev, the accuracy of locating the descent module in any weather reached between five and 10 meters.
The upgraded information recording system, SZI-M, for Soyuz-MS developed at AO RKS corporation uses modern, domestically produced electronics. Installed under a pilot seat inside the descent module, SZI-M will act as a "black box," collecting and storing a multitude of flight data, including technical information, physiological parameters of the crew members and voice communications during the descent and landing.
One of the latest challenges in upgrading the Soyuz was the limitation of the ship's power-supply system. Many new systems were coming with an increasing demand for electricity, which available solar panels and storage batteries had increasingly hard time to provide. According to estimates made around 2010, the power consumption around eight amperes aboard the Soyuz-T variant introduced at the beginning of the 1980s, was expected to grow to as much as 14.2 amperes on the Soyuz-TMA-M spacecraft (then still in development under a designation Series 700). (780)
DPM, Meteoroid Protection System
Satisfying a long-standing request from NASA, RKK Energia introduced additional shielding protecting thin walls of the habitation module, BO. It was designed to protect the most vulnerable part of the spacecraft in the unlikely but not impossible event of a meteoroid or space junk strike. According to some reports, the measure could also play a radiation-protection role, even though, the Soyuz flies well below the Earth's radiation belts and, normally, the crew exposure to radiation is insignificant.
According to NASA, the additional protection of the habitation module has been in place since the mission of the Soyuz TMA-04M spacecraft, as projected by the original plan from 2010.
Docking lighting system
By 2010, the Lisma-Postarm company in Saransk, Russia, could no longer guarantee the supply of KGZ 12-100 halogen light bulbs for the SMI-4 lights, which were used to illuminate the target during docking. Instead, the MS series received a new LED-based lighting system, SFOK, which was first tested on the Progress-MS-01 spacecraft.
Summary of Soyuz MS missions:
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Click to enlarge. Credit: Roskosmos
Old and new antennas on the Soyuz MS-01 spacecraft during its processing on May 17, 2016. Click to enlarge. Credit: Roskosmos
The habitation module of the Soyuz-MS spacecraft received new anti-meteoroid shielding. Click to enlarge. Credit: Roskosmos / Gazeta.ru
The EKTS system relies on an S-band phased array mounted on Progress-MS and Soyuz-MS spacecraft for communications with ground control via satellites. Credit: Merkuriy
The AO-753A antenna for the Kurs-NA radio rendezvous system replaced 2AO-VKS and AKR-VKA antennas. Credit: RKS
Soyuz MS-01 approaches ISS on July 9, 2016. Click to enlarge. Credit: Roskosmos