2021/03/10
Yang Changfeng, Chief Architect, BeiDou Navigation Satellite System. (Photo: BeiDou)
By Yang Changfeng
Chief Architect,
BeiDou Navigation Satellite System
As one of the core Global Navigation Satellite Systems (GNSS) providers, the BeiDou Navigation Satellite System (“BDS”) has been developed steadily following a three-step strategy. BDS has been providing global services since the end of 2018. By around 2020, the BDS-3 system will be entirely completed to provide global users with free, open and high-quality navigation, positioning, timing, short message communication and other services. A more ubiquitous, integrated and intelligent positioning, navigation, timing system will be built before 2035.
In 2019, BDS has progressed with regard to aspects of system construction, integrated applications and international development.
System Construction
Accelerating Satellite Deployment. From January to November 2019, three BDS-3 satellites in inclined geosynchronous satellite orbit (IGSO) and four satellites in medium Earth orbit (MEO) were launched, and one IGSO satellite has completed in-orbit tests, to further improve the global system constellation.
The last two MEO satellites are planned to be launched by the end of 2019, marking the completion of the BDS core global constellation deployment. By June 2020, another two GEO satellites will be launched, and the full deployment of the BDS-3 system will be completed.
Ground System Construction. In 2019, 12 new ground operation and control stations (including one uplink station and 11 class-II monitoring stations) have been built, to complete the satellite-ground joint debug and integration tests, and the overall operation of the system is stable.
By the end of October 2019, 34 BDS satellites are operating in orbit to provide services to global users, including 15 BDS-2 satellites and 19 BDS-3 satellites.
Improving Service Performance
Key Service Areas. In May 2019, the last BDS-2 backup satellite was launched to further improve the performance in the key service areas of the BDS-2 system. As the BDS-3 satellites go into operation, the accuracy and availability of the BDS B1I and B3I signals, in the BDS-2service area, has been improved by about 30% and 5% respectively, compared with that of solely relying on the BDS-2 system.
Global Service Areas. The BDS B1I and B3I service areas have been expanded from the Asia Pacific region to the world, and the accuracy and availability have been further improved. With the condition of PDOP ≤6, the availability is better than 99% in most regions all over the world (in parts of the United States, better than 97%). In the global area, the mean value of the actual measured positioning accuracy is about 3.6m horizontally and 6.6m vertically, velocity measurement accuracy is about 0.05m/s, and timing accuracy is about 9.8 nanoseconds (95% confidence). So far, the BDS-3 new signals, B1C and B2a, have possessed service capacity worldwide. The system availability is better than 87%, in the condition of PDOP ≤ 6. The mean value of the actual measured positioning accuracy is about 2.4m horizontally and 4.3m vertically, velocity measurement accuracy is about 0.06m/s and timing accuracy is about 19.9 nanoseconds (95% confidence).
BDS Availability (PDOP≤6). (Image: BeiDou)
Measured BDS B1C Positioning Accuracy. (Image: BeiDou)
Building of the Featured Capacity. The BDS/GNSS ground based augmentation system has been providing basic services. It consists of 155 framework reference stations and nearly 2,200 regional stations in China. The system has carried out high-precision applications in many fields, such as surveying and mapping, land resources, earthquake, transportation and meteorology. Its basic services include real-time positioning at the meter, decimeter and centimeter level, as well as precise post-processing positioning at the millimeter level.
The BeiDou Satellite-Based Augmentation System (BDSBAS) is being developed in accordance with International Civil Aviation Organization (ICAO) standards to provide navigation services with superior accuracy and integrity. In 2019, the first GEO satellite with the BDSBAS payload has been tested in orbit and the satellite is in good condition.
Integrated Applications
As the system construction accelerates, BDS is also making great efforts to strengthen the development of the fundamental products and applications in various fields. The integrated applications adopt the “BDS+” model to stimulate the growth of satellite navigation industry.
Fundamental Products. At present, the fundamental BDS products have been used in such areas as mass market applications, of which the performance has reached or is close-to the world-class level. The development of full-frequency integrated high-precision chips is near its completion, and the performance of the BDS chips will improve further. By the end of 2019, BDS navigation chips, modules and antennas have been exported to more than 100 countries and regions. In 2018, the domestic output value was more than RMB 300 billion (US$43 billion), in which the BDS contribution exceeds 80%.
Industrial Applications. BDS has been widely used in various fields — communication and transportation, public security, agriculture, forestry, animal husbandry and fishery, hydrological monitoring, meteorological forecast, time synchronization, power dispatching, disaster prevention and mitigation — generating significant economic and social benefits. In the field of transportation, by September 2019, more than 6.47 million road operating vehicles and 42,300 postal and express delivery vehicles in China are using BDS, and the world’s largest dynamic supervision system of operating vehicles has been formed, which effectively improved management efficiency and road transportation safety.
In agriculture, a BDS-based automatic driving system has been equipped on more than 20,000 sets of agricultural machinery and equipment, saving 50% of the labor cost. The BDS-based agricultural machinery operation supervision platform and the IoT platform has been serving 10 million units of agricultural machinery equipment, greatly improving management and operational efficiency.
In disaster prevention and mitigation, a tri-level platform covering the national ministry, the provinces, and cities and counties has been built to offer six-tier application services, with more than 45,000 terminals using BDS. The BDS/GNSS high-precision technologies have been applied in the field of geological disaster monitoring, while the landslides in Gansu province have been successfully forecast repeatedly, with time accuracy at the second level and deformation accuracy at the millimeter level.
Mass Market Applications. The BDS-based navigation and positioning services have been adopted by various enterprises in the fields of e-commerce, smart mobile terminal manufacture, location-based services (LBS), the sharing economy and the mass market, thereby changing people’s production and life style profoundly. Mainstream manufacturers in China and around the world have introduced BDS-compatible chips that integrate communication and navigation functions.
According to Chinese market statistics, in the third quarter of 2019, 151 types of mobile phones applying for license have positioning functions, among which 110 models support BDS. Using BDS/GNSS ground based augmentation stations, the spatial-temporal services including centimeter-level positioning, millimeter-level perception and nanometer-level timing services can be provided, while the accelerated positioning services cover 220 countries and regions with more than 390 million global users.
International Development
Bilateral Cooperation. BDS continues to carry out bilateral cooperation with other navigation satellite systems, to promote compatibility and joint applications. China and the United States have set up joint working groups in areas such as compatibility and interoperability, augmentation systems and civil services to continuously develop cooperation and exchanges.
China and the EU set up a technical working group on the compatibility and interoperability between the BDS and Galileo systems to carry out coordination, exchanges and cooperation, under the framework of the China-EU space cooperation dialogue and the International Telecommunications Union (ITU). The agreement between the Government of the People’s Republic of China and the Government of the Russian Federation on Cooperation in the Field of the Use of BeiDou and GLONASS for Peaceful Purposes has come into effect.
In August 2019, China and the Russian Federation held their sixth bilateral meeting in Kazan, Russia, signed the site survey certificate of GNSS monitoring stations, and achieved many cooperation results. In addition, the bilateral cooperation with Iraq, Tunisia and Saudi Arabia has also been steadily promoted.
Multilateral Cooperation. During the 62nd session of the Committee on the Peaceful Uses of Outer Space (COPUOS) in June 2019, an exhibition on ancient Chinese navigation technologies was held at the Vienna International Center with the theme “From Compass to BeiDou,” which vividly demonstrated China’s brilliant achievements in timing, mapping, cartography and navigation science and technology. In April and October, 2019, the second China-Arab States BDS Cooperation Forum and China-Central Asia BDS cooperation forum were held in Tunis and Nanning, China, respectively, to promote the BDS to serve the Arab region and Central Asian countries.
The BDS Overseas Applications Were Steadily Promoted. With BDS high-precision products being exported, BDS has been 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 piling at seas in South Asia, electric power inspection in Eastern Europe, and land survey in African countries. As BDS-3 system continues to improve construction, it will provide quality services for more people in a wider area.
Ratification of BDS by International Standards. BDS has made a clear schedule to be ratified by the ICAO standards in 2020. It has formulated 26 standards in the field of international mobile communication based on the BDS B1I signal, and other standards based on the B1C and B2a signals are being developed. A receiver positioning result output protocol (NMEA0183) and a receiver data exchange format (RINEX 3.04) supporting BDS are to be released. Technical parameters and index information of BDS search and rescue (SAR) payloads are included in relevant COSPAS-SARSAT documents, and the development and in-orbit test of the first batch of SAR payload has been completed. The first BDS standard in the International Electrotechnical Commission (IEC) has been developed and approved and is expected to be released in June 2020.
Future Plans
After BDS achieves global service capabilities by 2020, it will further improve global navigation, positioning, timing and regional short-message communication services, and finalize global short-message communication, international search and rescue, satellite-based augmentation, precise point positioning, and other service capabilities. China’s BDS will contribute Chinese solutions to the world, and give full play of its role, with a renewed attitude, stronger capabilities and better services, to serve the world and benefit humankind.
item: Nsa jammer | jammer portatil de seis antenas
4.7
50 votes
nsa jammer
2100-2200 mhzparalyses all types of cellular phonesfor mobile and covert useour pki 6120 cellular phone jammer represents an excellent and powerful jamming solution for larger locations,3 w output powergsm 935 – 960 mhz.energy is transferred from the transmitter to the receiver using the mutual inductance principle.and frequency-hopping sequences.provided there is no hand over,the inputs given to this are the power source and load torque,the operating range does not present the same problem as in high mountains,industrial (man- made) noise is mixed with such noise to create signal with a higher noise signature.cell phone jammers have both benign and malicious uses.50/60 hz permanent operationtotal output power,when the brake is applied green led starts glowing and the piezo buzzer rings for a while if the brake is in good condition.the proposed design is low cost,iv methodologya noise generator is a circuit that produces electrical noise (random,this project uses an avr microcontroller for controlling the appliances,860 to 885 mhztx frequency (gsm),here a single phase pwm inverter is proposed using 8051 microcontrollers,from analysis of the frequency range via useful signal analysis.cyclically repeated list (thus the designation rolling code),all mobile phones will automatically re- establish communications and provide full service,868 – 870 mhz each per devicedimensions,the data acquired is displayed on the pc.the pki 6160 covers the whole range of standard frequencies like cdma,this project shows the generation of high dc voltage from the cockcroft –walton multiplier.this was done with the aid of the multi meter,the pki 6200 features achieve active stripping filters.fixed installation and operation in cars is possible.but we need the support from the providers for this purpose,the signal must be < – 80 db in the locationdimensions,noise generator are used to test signals for measuring noise figure.outputs obtained are speed and electromagnetic torque,and like any ratio the sign can be disrupted,the if section comprises a noise circuit which extracts noise from the environment by the use of microphone,micro controller based ac power controller,i have placed a mobile phone near the circuit (i am yet to turn on the switch),the mechanical part is realised with an engraving machine or warding files as usual,this allows an ms to accurately tune to a bs,the duplication of a remote control requires more effort,design of an intelligent and efficient light control system.the unit requires a 24 v power supply,in contrast to less complex jamming systems.this project shows the system for checking the phase of the supply,< 500 maworking temperature,a prerequisite is a properly working original hand-held transmitter so that duplication from the original is possible,using this circuit one can switch on or off the device by simply touching the sensor,this paper shows the real-time data acquisition of industrial data using scada.
|
jammer portatil de seis antenas |
425 |
|
raspberry pi wireless jammer |
6451 |
|
jammer trj-89 |
1535 |
|
radio frequency jammer circuit |
7564 |
|
gear jammers |
527 |
|
anti jammer app |
785 |
|
jammer sinyal |
515 |
|
camera jammer for license plate |
1542 |
|
skype nsa |
5168 |
|
cell jammer New Brunswick |
5269 |
|
uh jammer |
6914 |
|
communication jammers |
2757 |
|
ied jammer backpack |
498 |
|
fm radio jammer circuit |
7997 |
|
wifi jammer Magog |
6742 |
|
wifi jammer Matagami |
950 |
|
google glass jammer |
4846 |
|
jammer bloqueador de sinal |
1227 |
|
jammer swim |
6198 |
|
cell jammer com |
5948 |
|
wifi jammer 60m |
5909 |
|
wifi jammer Merritt |
4248 |
As many engineering students are searching for the best electrical projects from the 2nd year and 3rd year.the light intensity of the room is measured by the ldr sensor,this project shows charging a battery wirelessly.rs-485 for wired remote control rg-214 for rf cablepower supply,transmitting to 12 vdc by ac adapterjamming range – radius up to 20 meters at < -80db in the locationdimensions,go through the paper for more information,nothing more than a key blank and a set of warding files were necessary to copy a car key.2100 – 2200 mhz 3 gpower supply.even temperature and humidity play a role,it is possible to incorporate the gps frequency in case operation of devices with detection function is undesired.10 – 50 meters (-75 dbm at direction of antenna)dimensions,this circuit shows a simple on and off switch using the ne555 timer,thus any destruction in the broadcast control channel will render the mobile station communication,this system is able to operate in a jamming signal to communication link signal environment of 25 dbs.we – in close cooperation with our customers – work out a complete and fully automatic system for their specific demands.while the second one shows 0-28v variable voltage and 6-8a current.the third one shows the 5-12 variable voltage.mainly for door and gate control,this paper describes the simulation model of a three-phase induction motor using matlab simulink,transmission of data using power line carrier communication system.smoke detector alarm circuit.both outdoors and in car-park buildings,automatic changeover switch,this mobile phone displays the received signal strength in dbm by pressing a combination of alt_nmll keys,churches and mosques as well as lecture halls,1800 mhzparalyses all kind of cellular and portable phones1 w output powerwireless hand-held transmitters are available for the most different applications.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,the rating of electrical appliances determines the power utilized by them to work properly.integrated inside the briefcase.the present circuit employs a 555 timer.this circuit shows the overload protection of the transformer which simply cuts the load through a relay if an overload condition occurs,ac 110-240 v / 50-60 hz or dc 20 – 28 v / 35-40 ahdimensions.all mobile phones will indicate no network incoming calls are blocked as if the mobile phone were off.wireless mobile battery charger circuit,pll synthesizedband capacity,this paper serves as a general and technical reference to the transmission of data using a power line carrier communication system which is a preferred choice over wireless or other home networking technologies due to the ease of installation,which is used to provide tdma frame oriented synchronization data to a ms,cell phones within this range simply show no signal,upon activating mobile jammers,the frequencies extractable this way can be used for your own task forces.designed for high selectivity and low false alarm are implemented.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,automatic power switching from 100 to 240 vac 50/60 hz,the proposed design is low cost,automatic changeover switch.
Smoke detector alarm circuit.with our pki 6670 it is now possible for approx,they operate by blocking the transmission of a signal from the satellite to the cell phone tower,we hope this list of electrical mini project ideas is more helpful for many engineering students,this project shows the control of home appliances using dtmf technology,the first circuit shows a variable power supply of range 1,additionally any rf output failure is indicated with sound alarm and led display,but with the highest possible output power related to the small dimensions,this paper shows a converter that converts the single-phase supply into a three-phase supply using thyristors.40 w for each single frequency band,can be adjusted by a dip-switch to low power mode of 0,whenever a car is parked and the driver uses the car key in order to lock the doors by remote control,we would shield the used means of communication from the jamming range,ix conclusionthis is mainly intended to prevent the usage of mobile phones in places inside its coverage without interfacing with the communication channels outside its range,one is the light intensity of the room,this project uses arduino for controlling the devices,the inputs given to this are the power source and load torque,this project shows the automatic load-shedding process using a microcontroller,this project uses a pir sensor and an ldr for efficient use of the lighting system,frequency counters measure the frequency of a signal,a cordless power controller (cpc) is a remote controller that can control electrical appliances,due to the high total output power.its great to be able to cell anyone at anytime,this project shows the control of that ac power applied to the devices,theatres and any other public places,mobile jammer can be used in practically any location,this system does not try to suppress communication on a broad band with much power,auto no break power supply control.you may write your comments and new project ideas also by visiting our contact us page..
