Как отключить gps трекер в машине
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Как отключить gps трекер в машине

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Global Positioning System

Global Positioning System (GPS) is a navigation system based on satellite. It has created the revolution in navigation and position location. It is mainly used in positioning, navigation, monitoring and surveying applications.

The major advantages of satellite navigation are real time positioning and timing synchronization. That’s why satellite navigation systems have become an integral part in most of the applications, where mobility is the key parameter.

A complete operational GPS space segment contains twenty-four satellites in MEO. These satellites are made into six groups so that each group contains four satellites. The group of four satellites is called as one constellation. Any two adjacent constellations are separated by 60 degrees in longitude.

The orbital period of each satellite is approximately equal to twelve hours. Hence, all satellites revolve around the earth two times on every day. At any time, the GPS receivers will get the signals from at least four satellites.

GPS Codes and Services

Each GPS satellite transmits two signals, L1 and L2 are of different frequencies. Trilateration is a simple method for finding the position (Latitude, Longitude, Elevation) of GPS receiver. By using this method, the position of an unknown point can be measured from three known points

GPS Codes

Following are the two types of GPS codes.

  • Coarse Acquisition code or C/A code
  • Precise code or P code

The signal, L1 is modulated with 1.023 Mbps pseudo random bit sequence. This code is called as Coarse Acquisition code or C/A code and it is used by the public.

The signal, L2 is modulated with 10.23 Mbps pseudo random bit sequence. This code is called as Precise code or P code and it is used in military positioning systems. Generally, this P code is transmitted in an encrypted format and it is called as Y code

The P code gives better measurement accuracy when compared to C/A code, since the bit rate of P code is greater than the bit rate of C/A code.

GPS Services

Following are the two types of services provided by GPS.

  • Precise Positioning Service (PPS)
  • Standard Positioning Service (SPS)

PPS receivers keep tracking of both C/A code and P code on two signals, L1 and L2. The Y code is decrypted at the receiver in order to obtain P code.

SPS receivers keep tracking of only C/A code on signal, L1.

GPS Receiver

There exists only one-way transmission from satellite to users in GPS system. Hence, the individual user does not need the transmitter, but only a GPS receiver. It is mainly used to find the accurate location of an object. It performs this task by using the signals received from satellites.

The block diagram of GPS receiver is shown in below figure.

GPS Receiver

The function of each block present in GPS receiver is mentioned below.

  • Receiving Antenna receives the satellite signals. It is mainly, a circularly polarized antenna.
  • Low Noise Amplifier (LNA) amplifies the weak received signal
  • Down converter converts the frequency of received signal to an Intermediate Frequency (IF) signal.
  • IF Amplifier amplifies the Intermediate Frequency (IF) signal.
  • ADC performs the conversion of analog signal, which is obtained from IF amplifier to digital. Assume, the sampling & quantization blocks are also present in ADC (Analog to Digital Converter).
  • DSP (Digital Signal Processor) generates the C/A code.
  • Microprocessor performs the calculation of position and provides the timing signals in order to control the operation of other digital blocks. It sends the useful information to Display unit in order to display it on the screen.

GPS Accuracy. A Complete Guide for Dummies

Anver Shykhmahomedov, Project Manager at Lemberg Solutions

We have written a lot of articles on the location tracking in app development already and many more to come, though we thought that the list will be incomplete without the basics. Below is a short outline to help you learn about GPS accuracy.

GPS Accuracy. A Complete Guide for Dummies - Lemberg Solutions Blog

What is GPS accuracy?

Accuracy refers to the degree of closeness of the indicated readings to the actual position. The accuracy of GPS results depends on a number of factors:

  • Number of channels on the receiver
  • Number of satellites in view
  • Signal interference caused by buildings
  • Mountains and ionospheric disturbances

With the current state of technology, best GPS results are 15 meters accurate (without SA) provided the receiver has a clear shot at a minimum of four satellites.

The Global Positioning System (GPS) was originally developed as a military tool. GPS uses satellite technology to find an exact location of user on the Earth. The system does this by using a minimum of three satellites transmitting a signal to an Earth-based receiver. Here is an overview of GPS technology.

GPS Accuracy. A Complete Guide for Dummies - Lemberg Solutions Blog

GPS system consists of three major segments:

  • Space segment
  • Control segment
  • User segment

The satellite segment deals with GPS space systems. The control segment corrects positions of satellites and communicates with them for correcting errors and synchronisation. The user segment is presented by many different types of existing GPS receivers and applications for them.

GPS Accuracy. A Complete Guide for Dummies - Lemberg Solutions Blog

Determining of User position: After receiving all available satellite signals, the receiver compares the time that the satellite sent the signal to the time it was received for each of the available signals. Then calculates the position by comparing the difference between the signals.

Factors That Form GPS Device Accuracy

If in the course of location tracking testing session you get different results on different mobile devices, this does not necessarily mean that there is a problem with the app. It has to do with the GPS receiver of each device having varying accuracy levels. Below is a list of parameters that affect location tracking accuracy:

  • Average number of satellites
  • Used satellites
  • Standard deviation
  • Average claimed accuracy (meters)
  • Standard deviation of claimed accuracy
  • Standard Deviation of Claimed Accuracy as a Percentage of Claimed Accuracy
  • Error Change per Satellite Used (metres)
  • Correlation Coefficient

In terms of criteria for GPS device selection, please look at the list below:

  • Horizontal accuracy – Minimal horizontal accuracy of the target device. Default is 32.8 feet (10 m).
  • Vertical accuracy – Accuracy in vertical direction. Default is 98.4 feet (30 m).
  • Max response time – Maximal response time in seconds. Default is 1 second.
  • Power consumption – Determines how much power should device use. This way, high power devices can be restricted. Default is No requirement.
  • Altitude required – Determines if the altitude is required. Default is true.
  • Speed and course – Determines if speed or course are required. Default is true.

LEARN MORE: Quality Assurance Services at Lemberg Solutions

Summary

So you now know what GPS accuracy means and what are the key factors that influence it.

Lemberg is always here to help, so don`t hesitate to contact us or add your questions in the comment section below.

Как отключить GPS трекер

GPS-трекеры — это устройства, которые используются для отслеживания местоположения и передачи этой информации на удаленный сервер. Их установка может осуществляться для контроля за работой компании, наблюдения за детьми или же для безопасности автомобиля. Однако, в некоторых случаях вы можете хотеть отключить GPS-трекер. В этой статье мы рассмотрим несколько способов, как это сделать, а также поделимся полезными советами.

  1. Можно ли заглушить GPS-трекер
  2. Как отключить GPS-трекер в телефоне
  3. Как заглушить GPS-трекер в машине
  4. Как узнать есть ли в машине GPS-трекер
  5. Полезные советы и выводы

Можно ли заглушить GPS-трекер

Заглушив GPS-трекер, вы нарушаете закон. Использование глушилок запрещено, наказание за это может быть очень серьезным, даже в виде уголовного преследования. Кроме того, заглушив один тип трекера, вы остаетесь под наблюдением другого. Поэтому, лучше не пытаться заглушить GPS-трекер, а искать более законные пути решения ваших проблем.

Как отключить GPS-трекер в телефоне

Настроить дополнительные параметры GPS и отключить отслеживание вашего местоположения можно в расширенных настройках под управлением операционной системы Android и iOS. Вот пошаговая инструкция:

  1. Для Android: Перейдите в меню «Настройки» — «Личные» — «Местоположение».

Для iOS: Перейдите в меню «Настройки» — «Конфиденциальность» — «Местоположение».

  1. Нажмите на переключатель и переведите его в положение «Выключено».

Как заглушить GPS-трекер в машине

Глушилка — это устройство, которое генерирует шумовой сигнал на той же частоте, что и GPS-трекер. Это позволяет заглушить сигналы и прервать связь между трекером и сервером. Однако, повторим еще раз, что это незаконно и может привести к серьезным последствиям.

Как узнать есть ли в машине GPS-трекер

Если вы подозреваете, что у вас установлен GPS-трекер и вы хотите проверить это, есть несколько способов.

  1. Осмотрите нижнюю часть приборной панели или сиденье водителя на наличие непривычных проводок.
  2. Используйте специальный сканер для обнаружения частоты GPS-трекера.
  3. Обращайтесь к специалистам в автомастерской для диагностики вашего автомобиля.

Полезные советы и выводы

  1. Если вы не знаете, зачем вам нужно отключить GPS-трекер, обратитесь к диспетчеру или владельцу автомобиля. Возможно, установка трекера была сделана для вашей собственной безопасности или в целях более эффективного управления компанией.
  2. Если вы все-таки планируете отключить GPS-трекер, делайте это только законными способами. Использование глушилок запрещено и может привести к серьезным наказаниям.
  3. Если вам кажется, что у вас установлен GPS-трекер, но вы не можете его найти, обращайтесь к профессионалам для детальной проверки вашего автомобиля.
  • Как включить трекер в Гугл картах
  • Как удалить свою компанию в гугл картах
  • Как посмотреть хронологию другого человека
  • Можно ли заглушить GPS фольгой
  • Почему Гугл карта не показывает местоположение

Для того, чтобы отключить GPS трекер на вашем устройстве, необходимо выполнить несколько простых действий. Во-первых, зайдите в настройки вашего устройства. Затем перейдите во вкладку «Личные» и выберите «Местоположение». Если же вы не нашли этой вкладки, то зайдите в раздел «Конфиденциальность» и выберите «Пароли и безопасность», после чего найдите вкладку «Местоположение». Далее вам нужно будет зайти в раздел дополнительных параметров GPS и найти опцию, которая отключает трекер. Её можно назвать отключением функции GPS-отслеживания. После выполнения всех этих действий ваше местоположение больше не будет отслеживаться.

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Как отключить gps трекер в машине

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Contents

  • What is GPS?
  • History of GPS
  • NASA’s Use of GPS
  • Space Communications
  • Spacecraft Orbit and Trajectory Determination
  • Science Applications
  • Autonomy of Spacecraft Operations
  • GPS Receiver Development
  • Benefits of GPS to Users in High Earth Orbit
  • Future of GPS

What is GPS?

The Global Positioning System (GPS) is a space-based radio-navigation system, owned by the U.S. Government and operated by the United States Air Force (USAF). It can pinpoint a three dimensional position to meter-level accuracy and time to the 10-nanosecond level, worldwide and 24/7.

Graphic image of a Global Positioning System (GPS) satellite with a black background.

Global Positioning System (GPS) Satellite

GPS is comprised of three different parts:

  • Space Segment: A constellation of at least 24 US government satellites distributed in six orbital planes inclined 55° from the equator in a Medium Earth Orbit (MEO) at about 20,200 kilometers (12,550 miles) and circling the Earth every 12 hours.
  • Control Segment: Stations on Earth monitoring and maintaining the GPS satellites.
  • User Segment: Receivers that process the navigation signals from the GPS satellites and calculate position and time.

History of GPS

GPS has its origins in the Sputnik era when scientists were able to track the satellite with shifts in its radio signal, known as the “Doppler Effect,” which became the foundational idea for modern GPS. Today the GPS satellite constellation (the space segment) consists of over 30 operational satellites, each equipped with redundant atomic clocks and tracked by a ground control network (the control segment). Each satellite transmits its position and time at regular intervals and those signals are intercepted by GPS receivers (the user segment). The receiver is able to determine its position by calculating how long it took for the signals to reach it.

In the early 1970’s, the Department of Defense (DoD) wanted to ensure a robust, stable satellite navigation system would be available. Embracing previous ideas from Navy scientists, the DoD decided to use satellites to support their proposed navigation system. DoD then followed through and launched its first Navigation System with Timing and Ranging (NAVSTAR) satellite in 1978. The 24 satellite system became fully operational in 1993.

Today, GPS is a multi-use, space-based radio-navigation system owned by the US Government and operated by the United States Air Force to meet national defense, homeland security, civil, commercial, and scientific needs. GPS currently provides two levels of service: Standard Positioning Service (SPS) which uses the coarse acquisition (C/A) code on the L1 frequency, and Precise Positioning Service (PPS) which uses the P(Y) code on both the L1 and L2 frequencies. Access to the PPS is restricted to US Armed Forces, US Federal agencies, and selected allied armed forces and governments. The SPS is available to all users on a continuous, worldwide basis, free of any direct user charges. The specific capabilities provided by SPS are published in the Global Positioning System Performance Standards and Specifications.

NASA’s Use of GPS

NASA’s mission to pioneer the future in space exploration, scientific discovery and aeronautics research necessitates the proactive development and implementation of a number of GPS applications to enable greater spacecraft autonomy and more advanced space science and Earth monitoring applications. To accomplish this, NASA works alongside the USAF to continue improving GPS capabilities to support space operation and science applications.

Space Communications

NASA users in orbit can determine their position and time using communications channel tracking via the Deep Space Network (DSN), Near Space Network (NSN), or by on-board means of processing one-way radio-navigation signals from Global Navigation Satellite Systems (GNSS), such as the US Global Positioning System (GPS). The DSN is also capable of supporting tracking from Low Earth Orbit (LEO) through interplanetary transfer domains. While NASA missions primarily use communication channel tracking by the DSN and NSN for trajectory analysis, individual missions may choose to also use GPS measurements as an observable or backup out to Geosynchronous Orbit (GEO – 36,000 Km) as acceptance of GPS for a positioning source becomes more widespread.

Spacecraft Orbit and Trajectory Determination

Traditionally, space missions have determined their orbit by using communications channel tracking, in which a Flight Dynamics Facility uses positioning information from two-way communication signals between the spacecraft and a ground station or relay satellite to calculate the spacecraft’s orbit. Alternatively, missions that choose to use GPS to determine their position track radio-navigation​ signals from GPS satellites and process these signals on-board to determine position and time. This increases spacecraft autonomy, enables new methods of spaceflight operations and reduces the burden on NASA’s tracking stations.

Science Applications

GPS is used as a remote sensing tool to support atmospheric and ionospheric sciences, geodesy and geodynamics – from monitoring sea levels and ice melt to measuring the Earth’s gravity field. SCaN​ and NASA’s Science Mission Directorate have partnered to improve the performance of the GPS constellation through policy advocacy for modernization improvements via the GPS requirements process, the National Space-based Positioning, Navigation, and Timing (PNT) Executive Committee and the National Space-based PNT​ Advisory Board.

GPS Earth Science Applications

One example is NASA leadership of an interagency team working to place laser retro-reflectors on the next generation of GPS, known as GPS III. Enabling satellite laser ranging to GPS and other GNSS constellations allows for systematic errors in the radiometric data to be identified and corrected. This information could then be used to improve the Earth-centered terrestrial reference frame that GPS positioning is based on, leading to millimeter level accuracies. This would generate a terrific increase in performance and precision that would allow scientists the word over to do such things as measure climate change effects by monitoring ice melt or sea levels. SMD is planning to purchase the reflectors, while also continuing its funding to the International Laser Ranging System (ILRS), which is an international network of ground laser tracking stations. The primary mission of ILRS is to support geodetic and geophysical research.

Autonomy of Spacecraft Operations

GPS, and other GNSS systems such as the Russian GLONASS constellation, may be used to enable more on-board autonomous navigation. GPS-based navigation uses one-way signals from GPS satellites to determine the spacecraft’s trajectory through its on-board instruments and data processing. GPS currently provides real-time on-board three dimensional position and time with a 95% accuracy of approximately 10 meters horizontally and 20 meters vertically per performance standards, however in reality the actual mission performance can be much better depending on the scenario or application. GPS may also provide accurate time synchronization and attitude determination (in lieu of other sensors, such as star trackers). The actual User Ranger Error (URE) on a global average has been demonstrated to be as precise as one meter or better in recent years.

GPS Service Volume

GPS Receiver Development

NASA has developed, and continues to improve, GPS flight and science receivers that are already in use.

Benefits of GPS to Users in High Earth Orbit

  • Significantly improves real-time navigation performance from km-class to meter-class
  • Supports quick trajectory maneuver recovery from 5-10 hours to minutes
  • Timing capabilities reduce a spacecraft’s need for expensive on-board clocks
  • Supports increased satellite autonomy, lowering mission operations costs
  • Enables new and enhanced capabilities and better performance for users in high-Earth orbit and Cislunar space

Future of GPS

Worldwide government and commercial spacecraft launch projections over the next two decades show that approximately 60 percent of future missions will operate in low-Earth orbit and 95 percent of missions will operate at or below geosynchronous orbit. NASA will continue to protect current investments and improve upon existing capabilities by working alongside other U.S. Government agencies and pursuing compatibility and interoperability with other Global Navigation Satellite System (GNSS) constellations.

Since most future missions will utilize GPS satellite signals for tracking, NASA is developing specialized GPS receivers for space applications, many of which are already in use:

  • The Navigator Receiver from NASA Goddard Space Flight Center (GSFC) utilizes the L1 C/A signal. This receiver flew on the Servicing Mission 4 for the Hubble Space Telescope in May 2009 and proved to be very successful. A number of future missions in HEO, GEO and MEO plan to work with this receiver using its high sensitivity signal acquisition and tracking capabilities.
  • The BlackJack Flight GPS Receiver from the Jet Propulsion Laboratory (JPL) utilizes both the L1 and L2 frequencies, with eighteen receivers already in orbit tracking GPS signals. The newly emerging Triple GNSS (TriG) Receiver is under development, with the capability to track a number of GPS and other GNSS signals, to include the Russian GLONASS and the European Galileo constellations.

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