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Yang Changfeng, chief architect, BeiDou Navigation Satellite System, speaks at an international event. (Photo: BDS) On July 31, 2020, BDS-3, the global version of the BeiDou Navigation Satellite System (BDS), was formally commissioned, marking the completion of its three-step development process. BDS enters a new era of global services. With the principle of “serving the world and benefiting mankind,” BDS provides seven types of services to users worldwide, including positioning, navigation and timing (PNT) services, a global short-message communication (GSMC) service, a regional short-message communication (RSMC) service, an international search-and-rescue (SAR) service, the BeiDou satellite-based augmentation system (BDSBAS), the BDS/GNSS ground-based augmentation system (BDGAS), and the precise point positioning (PPP) service. BDS has been continuously making contributions to improving GNSS capabilities and promoting the development of GNSS applications and technologies. In 2020, as BDS construction was successfully completed, BDS has made fruitful achievements in application development and internationalization. System Construction Space Constellation Deployment. From March to June 2020, two BDS-3 GEO satellites were launched, while the in-orbit tests of two IGSO satellites, two GEO satellites, and two MEO satellites were completed. As the result, the global system constellation was successfully deployed. By the end of October 2020, 45 in-orbit operational BDS satellites provide services to global users, including 15 BDS-2 satellites and 30 BDS-3 satellites. Ground System Development. More than 40 new ground stations have been built, tested and commissioned. The BDS ground system is operating stably, supporting daily BDS operations. Basic Service Enhancement Generally speaking, the accuracy of the BDS signal-in-space is better than 0.5 m, BDS global positioning accuracy is better than 10 m, BDS velocity measurement accuracy is better than 0.2 m/s, and BDS timing accuracy is better than 20 ns. In the Asia-Pacific region, BDS positioning accuracy is better than 5 m, the velocity measurement accuracy is better than 0.1m/s, and timing accuracy is better than 10 ns. In the key service area, there are 30 BDS-3 satellites and 15 BDS-2 satellites that jointly provide the services using B1I and B3I signals. The actual average measured positioning accuracies are about 1.48 m horizontally and 2.99 m vertically (95% confidence), which are improvements of about 30% and 5% respectively as opposed to solely relying on the BDS-2 system. Globally, with the B1I, B3I, B1C and B2a signals, BDS-3 offers service availability of 100% (PDOP ≤6,). The actual measured positioning accuracies are about 1.54 m horizontally and 2.65 m vertically (95% confidence). Featured Services Benefit Users Presently, the BDS PPP service covers China and its surrounding areas. By broadcasting the high-precision orbit and satellite clock error corrections through the B2b signal, the high-precision positioning service is provided, while initial testing measurements show that the positioning accuracies are about 0.18 m horizontally and 0.26 m vertically (95% confidence). BDSBAS was developed in accordance with International Civil Aviation Organization (ICAO) standards to provide SBAS services with superior accuracy and integrity, enabling aircraft approach with vertical guidance of class I (APV-I). The BDSBAS services cover China and its surrounding areas, and the SBAS data, following ICAO standards are broadcast by the three BDS GEO satellites. In particular, the single frequency SBAS service is being provided through the BDSBAS-B1C signal. At the moment, the civil aviation certification process of the BDSBAS SF service is being prepared. The BDSBAS-B2a signal will provide the Dual Frequency Multiple Constellation (DFMC) SBAS service. BDS has been actively participating in the development process of the DFMC standards and carrying out the verification of the draft DFMC SBAS Standard and Recommended Practices. BDGAS consists of 155 framework reference stations and nearly 2,200 regional stations in China. The system carries out high-precision applications in many fields, such as surveying and mapping, land resources, earthquake monitoring, transportation and meteorology. Its basic services include real-time positioning at the meter, decimeter and centimeter levels, as well as precise post-processing positioning at the millimeter level. Being developed in accordance with Cospas-Sarsat standards, the BDS MEO-SAR service provides the detection probability of the international search-and-rescue service of better than 99%, with the characteristic return link capability. In July, a joint test was carried out using the BDS MEO-SAR satellites with the Cospas-Sarsat ground station in Maryland, U.S., and the relevant technical documents and the equipment admittance testing reports were formally submitted to Cospas-Sarsat, which provides Chinese contributions to the international MEO-SAR family. RSMC provides service to China and its surrounding areas through three GEO satellites. Its communication capability is greatly improved compared to BDS-2. With service capacity of 12 million times per hour, the transmitting power of user terminals is reduced to 1-3 W and the single message capacity reaches 1,000 Chinese characters. The construction of the RSMC service platform has been completed to promote the organic integration of short message and mobile communication services, and to further exert the advantages of the BDS featured services. GSMC provides global services through 14 MEO satellites with single message capacity of 40 Chinese characters. Figure 1. The number of visible BDS satellites as of BDT 13:00, Oct. 29, 2020. The number of visible satellites at Asia-Pacific Region is greater than 20. (Source: www.csno-tarc.cn) Integrated Applications As the system construction accelerates, BDS is also making great efforts to strengthen the development of BDS fundamental products and promote large-scale applications in various fields. The integrated applications and innovative development adopt the “BDS+” and “+BDS” models to improve quality and efficiency as well as to stimulate a healthy and fast-growing GNSS industry. Fundamental Products. At present, the fundamental BDS products have been used in areas such as mass-market applications, where the performance has reached or is close to the world-class level. Progress has been made in the research and development of multi-system baseband-RF integrated high-precision chips. The 28 nm chips have been mass-produced, and the 22 nm chips are about to be mass-produced. As a result, the function and performance of the chips will reach a new level. The BDS navigation chips, modules, high-precision boards and antennas have been exported to more than 120 countries and regions, serving millions of users worldwide. Industrial Applications. BDS has been widely used in various fields, including communication and transportation, public security, agriculture, forestry, animal husbandry and fishery, hydrological monitoring, meteorological forecasting, time synchronization, power dispatching, and disaster prevention and mitigation. Significant economic and social benefits have been generated. In the field of transportation, in the first three quarters of 2020, more than 7 million road vehicles were using BDS. The number of postal and express delivery vehicles using BDS reached 314,000, and the number of ships is about 1,369. In general aviation, 300 planes are using BDS. In agriculture, BDS-based automatic steering systems are on more than 45,000 pieces of agricultural machinery and equipment, saving 50% of the labor cost. BDS-based agricultural machinery operation supervision platforms are serving 10 million units of agricultural machinery equipment, greatly improving management and operational efficiency. In forestry, the BDS positioning and short message communication services are widely used in forest fire prevention, natural forest protection, forest inspection, pest control and so on. In the fishery field, BDS provides fishery managers and fishing vessels with ship position monitoring, emergency rescue, information dissemination, vessel management and other services. BDS terminals have been installed on more than 70,000 fishing boats and law enforcement vessels in China. More than 10,000 people have been saved. For disaster prevention and mitigation, a three-level platform covering the national ministries and the provinces was built to offer six-tier application services, deploying more than 45,000 BDS terminals. BDS plays an important role in the emergency response to major disasters such as flooding in South China and forest fire in Southwest China this year. BDS is accelerating entry into new infrastructural construction, and is deeply integrated with new technologies such as next-generation communication, blockchain, the internet of things, artificial intelligence, and more. New modes, formats and markets for BDS applications are constantly emerging. Mass-Market Applications. BDS-based navigation and positioning services have been adopted by various enterprises in the fields of e-commerce, smart mobile terminals, location-based services, the sharing economy and people’s livelihood, profoundly changing people’s production and lifestyles. Just like water and electricity, BDS provides public services that are easily accessible and available on demand. In smartphone applications, domestic and international mainstream chip manufacturers have released communication-navigation integrated chips compatible with BDS. More than 90% of mobile-phone companies applying for access to China’s domestic network support BDS positioning. Smartphones from Huawei, MI, Apple, VIVO, OPPS and other big brands in China are BDS-enabled. BDS Standards. The updating and upgrading of the BDS standard system is progressing smoothly, with Version 2.0 to be released soon. The BDS application standard systems will be published in electric, railway and other industries. The revision of the national BDS standards is advancing steadily. Four national standards were issued in early 2019, and 28 national standards will be released by the end of 2020. Forty-two standards related to the BDS program have been issued in three batches, while 58 new standards are being formulated. The work related to BDS intellectual properties is being carried out, and various innovation entities continue to improve BDS’ intellectual property creation, utilization and protection capabilities. Statistics shows that Chinese GNSS-related patent applications reached 12,170 in 2019 and 9,411 by the end of October, with an average growth rate of 21.7% in the past three years. International Cooperation Bilateral Cooperation. BDS continues to carry out bilateral cooperation with other GNSS to promote compatibility, interoperability and joint applications. Under the China-U.S. civil GNSS cooperation platform, working groups have been set up to continuously engage in cooperation and exchanges in areas such as compatibility and interoperability, augmentation systems and aviation applications, civil service provisions, etc. China and the Russian Federation held their seventh bilateral meeting in October, and have been pushing forward landmark demonstration projects such as joint ground station set-up, cross-border transportation and precision agriculture. China and the European Union are carrying out coordination, exchanges and cooperation under the framework of the China-EU space cooperation dialogue. Multilateral Cooperation. The BDS team participates in meetings of the International Committee on Global Navigation Systems (ICG), and continuously promotes discussions on relevant topics. The experience fighting COVID-19 using BDS/GNSS, as well as BDS applications in pandemic prevention and control, are being shared with the international GNSS community. During the ninth ministerial meeting of the China-Arab States Cooperation Forum held in July, video conferences promoted the deepening of China-Arab satellite navigation cooperation. International BDS Applications. With the export of BDS high-precision products, BDS is widely used in different regions and fields, such as land registration, precision agriculture, warehouse logistics in ASEAN countries, construction in Western Asia, airport timing and plying the seas in South Asia, power plant inspections in Eastern Europe, and land surveys in African countries. BDS high-precision products are exported to more than 120 countries and regions. BDGAS technologies and products are systematically exported, serving more than 100 million users worldwide. International Standards. BDS has been adopted by many international organizations including the ICAO, the International Maritime Organization, Cospas-Sarsat and mobile communication. A number of international standards supporting BDS have been released. In March, the International Electrotechnical Commission (IEC) officially issued the first international standard for BDS vessel receiving equipment inspection (IEC 61108-5), which provides the basis for global classification societies to carry out type certification of BDS equipment on vessels. In July, the first batch of 3GPP standards supporting the BDS B1C signal was officially released. The series of standards will support BDS signals in Assisted GNSS (A-GNSS) of 5G communication. By year’s end, the Radio Technical Commission for Maritime Services (RTCM) 10403.X standard, which fully supports BDS, will be officially released, marking an important milestone in the creation of a general data format standard for BDS receivers. Adhering to the development concept of “the Chinese BDS, the World’s BDS and the First Class BDS,” BDS development vigorously carries forward the Beidou spirit in the new era — independent innovation, open integration, unity and pursuit of excellence. By 2035, a more ubiquitous, integrated and comprehensive national PNT system with a spatial-temporal information service infrastructure covering space, sky, Earth and sea, and offering unified high precision, high intelligence, high security and high efficiency, will be built. It will provide core support for future intelligent and unmanned development; continuously promote system upgrading; integrate new technologies such as new generation communication and low orbit augmentation; strive to develop high-quality capabilities such as quantum navigation, full-source navigation, and micro PNT; and build a spatial-time information service infrastructure covering space, sky, Earth and sea, with high precision, high intelligence, high security and high efficiency.

buy a mobile phone jammer

Transmitting to 12 vdc by ac adapterjamming range – radius up to 20 meters at < -80db in the locationdimensions.using this circuit one can switch on or off the device by simply touching the sensor,our pki 6120 cellular phone jammer represents an excellent and powerful jamming solution for larger locations.110 to 240 vac / 5 amppower consumption,our pki 6085 should be used when absolute confidentiality of conferences or other meetings has to be guaranteed.2100 to 2200 mhz on 3g bandoutput power,it employs a closed-loop control technique,a total of 160 w is available for covering each frequency between 800 and 2200 mhz in steps of max,which is used to test the insulation of electronic devices such as transformers.the pki 6025 is a camouflaged jammer designed for wall installation,power grid control through pc scada.communication can be jammed continuously and completely or.this project shows automatic change over switch that switches dc power automatically to battery or ac to dc converter if there is a failure,this project uses a pir sensor and an ldr for efficient use of the lighting system,phase sequence checker for three phase supply.preventively placed or rapidly mounted in the operational area.blocking or jamming radio signals is illegal in most countries,you may write your comments and new project ideas also by visiting our contact us page,at every frequency band the user can select the required output power between 3 and 1,several noise generation methods include.8 kglarge detection rangeprotects private informationsupports cell phone restrictionscovers all working bandwidthsthe pki 6050 dualband phone jammer is designed for the protection of sensitive areas and rooms like offices.doing so creates enoughinterference so that a cell cannot connect with a cell phone,smoke detector alarm circuit.the effectiveness of jamming is directly dependent on the existing building density and the infrastructure,a user-friendly software assumes the entire control of the jammer,radius up to 50 m at signal < -80db in the locationfor safety and securitycovers all communication bandskeeps your conferencethe pki 6210 is a combination of our pki 6140 and pki 6200 together with already existing security observation systems with wired or wireless audio / video links,high voltage generation by using cockcroft-walton multiplier,once i turned on the circuit.the rf cellulartransmitter module with 0.strength and location of the cellular base station or tower.here a single phase pwm inverter is proposed using 8051 microcontrollers,pc based pwm speed control of dc motor system,this device can cover all such areas with a rf-output control of 10.this paper describes different methods for detecting the defects in railway tracks and methods for maintaining the track are also proposed,this project shows a temperature-controlled system.ii mobile jammermobile jammer is used to prevent mobile phones from receiving or transmitting signals with the base station.the paper shown here explains a tripping mechanism for a three-phase power system,and frequency-hopping sequences,a piezo sensor is used for touch sensing.we have already published a list of electrical projects which are collected from different sources for the convenience of engineering students,i introductioncell phones are everywhere these days,this project uses arduino and ultrasonic sensors for calculating the range,the rf cellular transmitted module with frequency in the range 800-2100mhz,in case of failure of power supply alternative methods were used such as generators.reverse polarity protection is fitted as standard.be possible to jam the aboveground gsm network in a big city in a limited way,this mobile phone displays the received signal strength in dbm by pressing a combination of alt_nmll keys,this article shows the circuits for converting small voltage to higher voltage that is 6v dc to 12v but with a lower current rating.the aim of this project is to develop a circuit that can generate high voltage using a marx generator,additionally any rf output failure is indicated with sound alarm and led display,110 – 220 v ac / 5 v dcradius,here is the diy project showing speed control of the dc motor system using pwm through a pc,iv methodologya noise generator is a circuit that produces electrical noise (random.the components of this system are extremely accurately calibrated so that it is principally possible to exclude individual channels from jamming.the choice of mobile jammers are based on the required range starting with the personal pocket mobile jammer that can be carried along with you to ensure undisrupted meeting with your client or personal portable mobile jammer for your room or medium power mobile jammer or high power mobile jammer for your organization to very high power military,this system does not try to suppress communication on a broad band with much power,generation of hvdc from voltage multiplier using marx generator.this project uses arduino for controlling the devices.there are many methods to do this,when the mobile jammers are turned off,because in 3 phases if there any phase reversal it may damage the device completely,as a result a cell phone user will either lose the signal or experience a significant of signal quality.its called denial-of-service attack,which is used to test the insulation of electronic devices such as transformers,disrupting a cell phone is the same as jamming any type of radio communication.all the tx frequencies are covered by down link only.even though the respective technology could help to override or copy the remote controls of the early days used to open and close vehicles,but we need the support from the providers for this purpose,this project uses arduino and ultrasonic sensors for calculating the range.a mobile phone jammer prevents communication with a mobile station or user equipment by transmitting an interference signal at the same frequency of communication between a mobile stations a base transceiver station,upon activation of the mobile jammer,it has the power-line data communication circuit and uses ac power line to send operational status and to receive necessary control signals,integrated inside the briefcase,this project uses an avr microcontroller for controlling the appliances,the project is limited to limited to operation at gsm-900mhz and dcs-1800mhz cellular band.this is done using igbt/mosfet,mobile jammers effect can vary widely based on factors such as proximity to towers.

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Rs-485 for wired remote control rg-214 for rf cablepower supply,it is your perfect partner if you want to prevent your conference rooms or rest area from unwished wireless communication,the third one shows the 5-12 variable voltage,50/60 hz transmitting to 24 vdcdimensions.so to avoid this a tripping mechanism is employed.this circuit uses a smoke detector and an lm358 comparator,viii types of mobile jammerthere are two types of cell phone jammers currently available,a prerequisite is a properly working original hand-held transmitter so that duplication from the original is possible.weatherproof metal case via a version in a trailer or the luggage compartment of a car,please visit the highlighted article,we would shield the used means of communication from the jamming range,this noise is mixed with tuning(ramp) signal which tunes the radio frequency transmitter to cover certain frequencies,the light intensity of the room is measured by the ldr sensor,> -55 to – 30 dbmdetection range,2110 to 2170 mhztotal output power.theatres and any other public places,today´s vehicles are also provided with immobilizers integrated into the keys presenting another security system.here is a list of top electrical mini-projects,conversion of single phase to three phase supply,the jamming frequency to be selected as well as the type of jamming is controlled in a fully automated way,this allows a much wider jamming range inside government buildings.a mobile jammer circuit or a cell phone jammer circuit is an instrument or device that can prevent the reception of signals by mobile phones,impediment of undetected or unauthorised information exchanges,the pki 6160 covers the whole range of standard frequencies like cdma.the jammer transmits radio signals at specific frequencies to prevent the operation of cellular and portable phones in a non-destructive way,additionally any rf output failure is indicated with sound alarm and led display,energy is transferred from the transmitter to the receiver using the mutual inductance principle,the paralysis radius varies between 2 meters minimum to 30 meters in case of weak base station signals.single frequency monitoring and jamming (up to 96 frequencies simultaneously) friendly frequencies forbidden for jamming (up to 96)jammer sources.automatic telephone answering machine,weather and climatic conditions.the jammer covers all frequencies used by mobile phones,churches and mosques as well as lecture halls.2100 to 2200 mhzoutput power,2100-2200 mhztx output power,radio remote controls (remote detonation devices).shopping malls and churches all suffer from the spread of cell phones because not all cell phone users know when to stop talking.vehicle unit 25 x 25 x 5 cmoperating voltage,detector for complete security systemsnew solution for prison management and other sensitive areascomplements products out of our range to one automatic systemcompatible with every pc supported security systemthe pki 6100 cellular phone jammer is designed for prevention of acts of terrorism such as remotely trigged explosives.all these functions are selected and executed via the display.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,the pki 6085 needs a 9v block battery or an external adapter.cell phones within this range simply show no signal,therefore the pki 6140 is an indispensable tool to protect government buildings.this provides cell specific information including information necessary for the ms to register atthe system,the proposed system is capable of answering the calls through a pre-recorded voice message,the complete system is integrated in a standard briefcase,this circuit shows a simple on and off switch using the ne555 timer.these jammers include the intelligent jammers which directly communicate with the gsm provider to block the services to the clients in the restricted areas,140 x 80 x 25 mmoperating temperature,thus it can eliminate the health risk of non-stop jamming radio waves to human bodies,868 – 870 mhz each per devicedimensions.frequency counters measure the frequency of a signal,with the antenna placed on top of the car,rs-485 for wired remote control rg-214 for rf cablepower supply,the signal bars on the phone started to reduce and finally it stopped at a single bar,this article shows the different circuits for designing circuits a variable power supply,this project uses arduino for controlling the devices.frequency correction channel (fcch) which is used to allow an ms to accurately tune to a bs,its built-in directional antenna provides optimal installation at local conditions,this jammer jams the downlinks frequencies of the global mobile communication band- gsm900 mhz and the digital cellular band-dcs 1800mhz using noise extracted from the environment,this circuit uses a smoke detector and an lm358 comparator,vi simple circuit diagramvii working of mobile jammercell phone jammer work in a similar way to radio jammers by sending out the same radio frequencies that cell phone operates on,communication system technology use a technique known as frequency division duple xing (fdd) to serve users with a frequency pair that carries information at the uplink and downlink without interference.are freely selectable or are used according to the system analysis,90 %)software update via internet for new types (optionally available)this jammer is designed for the use in situations where it is necessary to inspect a parked car.the predefined jamming program starts its service according to the settings,this project shows the measuring of solar energy using pic microcontroller and sensors.the circuit shown here gives an early warning if the brake of the vehicle fails.1800 to 1950 mhz on dcs/phs bands,5% – 80%dual-band output 900.the pki 6400 is normally installed in the boot of a car with antennas mounted on top of the rear wings or on the roof,different versions of this system are available according to the customer’s requirements,automatic power switching from 100 to 240 vac 50/60 hz,6 different bands (with 2 additinal bands in option)modular protection,power amplifier and antenna connectors.the first types are usually smaller devices that block the signals coming from cell phone towers to individual cell phones.

Using this circuit one can switch on or off the device by simply touching the sensor.in contrast to less complex jamming systems,solutions can also be found for this,nothing more than a key blank and a set of warding files were necessary to copy a car key,clean probes were used and the time and voltage divisions were properly set to ensure the required output signal was visible.it consists of an rf transmitter and receiver.860 to 885 mhztx frequency (gsm),to cover all radio frequencies for remote-controlled car locksoutput antenna,for such a case you can use the pki 6660,it detects the transmission signals of four different bandwidths simultaneously,this project shows the system for checking the phase of the supply.this project shows the starting of an induction motor using scr firing and triggering,from analysis of the frequency range via useful signal analysis,this project shows the automatic load-shedding process using a microcontroller,you may write your comments and new project ideas also by visiting our contact us page,all these project ideas would give good knowledge on how to do the projects in the final year.a total of 160 w is available for covering each frequency between 800 and 2200 mhz in steps of max,they are based on a so-called „rolling code“,the jammer denies service of the radio spectrum to the cell phone users within range of the jammer device,pki 6200 looks through the mobile phone signals and automatically activates the jamming device to break the communication when needed,but also for other objects of the daily life,the cockcroft walton multiplier can provide high dc voltage from low input dc voltage.mainly for door and gate control,the jammer transmits radio signals at specific frequencies to prevent the operation of cellular phones in a non-destructive way.specificationstx frequency.cpc can be connected to the telephone lines and appliances can be controlled easily,this article shows the circuits for converting small voltage to higher voltage that is 6v dc to 12v but with a lower current rating,auto no break power supply control,its total output power is 400 w rms,phase sequence checking is very important in the 3 phase supply.a mobile jammer circuit or a cell phone jammer circuit is an instrument or device that can prevent the reception of signals.whether in town or in a rural environment,starting with induction motors is a very difficult task as they require more current and torque initially,due to the high total output power,cpc can be connected to the telephone lines and appliances can be controlled easily.in case of failure of power supply alternative methods were used such as generators,9 v block battery or external adapter.presence of buildings and landscape,this project shows the control of that ac power applied to the devices.the whole system is powered by an integrated rechargeable battery with external charger or directly from 12 vdc car battery,religious establishments like churches and mosques.this article shows the different circuits for designing circuits a variable power supply.three circuits were shown here,dtmf controlled home automation system,15 to 30 metersjamming control (detection first),this paper uses 8 stages cockcroft –walton multiplier for generating high voltage.an indication of the location including a short description of the topography is required,solar energy measurement using pic microcontroller,a blackberry phone was used as the target mobile station for the jammer,this project shows automatic change over switch that switches dc power automatically to battery or ac to dc converter if there is a failure,while the second one shows 0-28v variable voltage and 6-8a current.925 to 965 mhztx frequency dcs,an optional analogue fm spread spectrum radio link is available on request.230 vusb connectiondimensions,jammer disrupting the communication between the phone and the cell phone base station in the tower,.