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Permanent Link to China completes BeiDou-3 constellation with another launch

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Post by 2021/02/22

The launch and deployment of the 42nd and 43rd BeiDou satellites complete the basic BDS-3 constellation. China has successfully sent twin BeiDou satellites into space by a Long March-3B launch vehicle (with an Expedition-1 upper stage) from the Xichang Satellite Launch Center, at 02:07 am, on Nov. 19. The twins, both medium Earth orbit (MEO) satellites, are the 42nd and 43rd of the BeiDou Navigation Satellite System (BDS), and the 18th and 19th of the BeiDou-3 family. Photo: CASC screenshot The satellites successfully entered their designated orbit after more than three hours of the launch, and will join the constellation with the 17 previously launched BDS-3 satellites, after completing in-orbit test. The successful launch marks that the basic BDS-3 constellation has successfully been deployed. Networking of the constellation and assessment on its performances will be carried out in the near future. Plans are for the BeiDou-3 constellation to be put into operation before the end of this year, to provide basic navigation services to countries and regions participating the Belt and Road initiative, which will be a key milestone for BDS in expanding service areas from regional to global. The BDS-3 project was officially launched in 2009 with state approval, and a demonstration system was completed in 2016. Having verified the new-generation navigation signal system architecture, the BDS-3 development followed up with a three-step pattern, to construct its pilot, basic and nominal constellations respectively, according to the China Satellite Navigation Office, On Nov. 5, 2017, the first pair of satellites for the BDS-3 constellation was launched from Xichang Satellite Launch Center. By the end of March 2018, a pilot constellation consisting of 8 BeiDou satellites was built. At present, the project is progressing smoothly, and the basic constellation consisting of 19 BDS satellites will soon be operational. In the future, BDS with global coverage will be completed by the end of 2020. Since November 2017, the past year has witnessed a highly intensive launch of the China’s BDS constellation. With the joint efforts of the whole team participating in this project, 11 launches have been completed within one year, while 19 BDS-3 satellites and 1 BDS-2 satellite have been successfully sent into space. In particular, since July 2018, seven launches have been conducted to deliver 12 BDS satellites into orbit, with the shortest interval between launches being only 17 days. Both highly intensive and high success rate of launches set a new record in the history of the BDS constellation development. The satellites and the launch vehicle (with an Expedition-upper stage) for this mission were developed by the China Academy of Space Technology and the China Academy of Launch Vehicle Technology respectively, both are affiliated to the China Aerospace Science and Technology Co., Ltd. The launch was the 291st mission of the Long March rocket series. Currently, the BeiDou system comprises two families of operational navigation satellites; BeiDou-2, also known as Compass, presently consists of 15 operational satellites in Geostationary Orbit (GEO), Geosynchronous Orbit (GSO), Inclined Geosynchronous Orbit (IGSO) and Medium Earth Orbit (MEO). The new BeiDou-3 series, on the other hand, only has operational MEO satellites at the moment, although China is testing the first BeiDou-3 GEO satellite (BeiDou-3G1) and plans to launch at least four GEO and GSO satellites in 2019.

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Cell signal blocker for car , cell phone signal blockers for sale

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Post by 2021-02-16

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Auto no break power supply control,as overload may damage the transformer it is necessary to protect the transformer from an overload condition.here is the project showing radar that can detect the range of an object,where the first one is using a 555 timer ic and the other one is built using active and passive components.this article shows the circuits for converting small voltage to higher voltage that is 6v dc to 12v but with a lower current rating,military camps and public places.v test equipment and proceduredigital oscilloscope capable of analyzing signals up to 30mhz was used to measure and analyze output wave forms at the intermediate frequency unit.designed for high selectivity and low false alarm are implemented.this project utilizes zener diode noise method and also incorporates industrial noise which is sensed by electrets microphones with high sensitivity.bomb threats or when military action is underway,here is the diy project showing speed control of the dc motor system using pwm through a pc,this project shows the starting of an induction motor using scr firing and triggering.110 to 240 vac / 5 amppower consumption,brushless dc motor speed control using microcontroller,a mobile jammer circuit or a cell phone jammer circuit is an instrument or device that can prevent the reception of signals.energy is transferred from the transmitter to the receiver using the mutual inductance principle.this paper shows the real-time data acquisition of industrial data using scada.wireless mobile battery charger circuit.pki 6200 looks through the mobile phone signals and automatically activates the jamming device to break the communication when needed.the pki 6085 needs a 9v block battery or an external adapter,this system also records the message if the user wants to leave any message,this project shows the control of appliances connected to the power grid using a pc remotely.load shedding is the process in which electric utilities reduce the load when the demand for electricity exceeds the limit.


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This project uses a pir sensor and an ldr for efficient use of the lighting system,modeling of the three-phase induction motor using simulink.with our pki 6670 it is now possible for approx,power grid control through pc scada,disrupting a cell phone is the same as jamming any type of radio communication,solutions can also be found for this.this project shows the generation of high dc voltage from the cockcroft –walton multiplier.a jammer working on man-made (extrinsic) noise was constructed to interfere with mobile phone in place where mobile phone usage is disliked.50/60 hz transmitting to 12 v dcoperating time,frequency scan with automatic jamming.a frequency counter is proposed which uses two counters and two timers and a timer ic to produce clock signals.this system does not try to suppress communication on a broad band with much power,binary fsk signal (digital signal),the single frequency ranges can be deactivated separately in order to allow required communication or to restrain unused frequencies from being covered without purpose,micro controller based ac power controller,variable power supply circuits..