The industrial revolution has connected people in all sectors of the world at the same time, but also invented and created many new machines and equipment, convenient for people's life and work, the car is the product of the industrial revolution, in recent years, with the rapid development of China's automobile industry, the continuous popularity of private cars, the car navigation industry has also grown rapidly. China's car navigation industry started in 2002, car navigation technology after more than 10 years of market cultivation, the application of GPS global positioning system has gradually matured, and is infiltrating into the real life of various industries. In recent years, the automobile industry has become a pillar industry in China, and automobiles have become the main tool for people to travel and play an increasingly important role. The full application of GPS to the automotive industry is not only the need for the further development of the automotive industry, but also an important measure to solve the current traffic problems.
GPS Global Positioning System (GPS) is a kind of latest satellite positioning system in the development of modern society, which mainly accepts the signals of 24 satellites distributed above the earth through ground GPS receivers, so as to obtain real-time, reliable and effective three-dimensional location and time and other required information.
The basic principle of GPS positioning is to determine the position of the point to be measured according to the instantaneous position of the high-speed moving satellite as the known starting data, and the method of meeting the rear of the spatial distance. As shown in the figure, assuming that a GPS receiver is placed on the ground at time t, the time when the GPS signal arrives at the receiver can be determined, and the following four equations can be determined by adding other data such as satellite ephemeris received by the receiver).
The blind spot compensation in the GPS navigation application is mainly to provide the following reference information for the system as compensation when the signal of the GPS module system is not good: direction, distance (to the point of interest), altitude. In a GPS navigation system that uses a blind spot compensation sensor, if the GPS signal is not lost, the GPS satellite can be used for navigation, and if the GPS signal is lost, the auxiliary sensor is used to compensate and calculate the distance and direction of travel. Because route maps need to be marked between destinations, in GPS-only module systems, auxiliary sensors are required to extrapolate the marked route when there is no satellite signal. While enjoying the convenience of GPS navigation, it is common to hear complaints that GPS often issues wrong navigation instructions when driving on overpasses and elevated roads. For example, when driving normally on the bridge, the GPS suddenly tells you to turn right, but there is no exit to turn right on the bridge, this is because the GPS receiver does not accurately judge whether the vehicle is actually on the bridge or under the bridge, thus issuing the wrong command.
The error of the altitude value calculated by the current GPS receiver is basically about tens of meters, and some GPS receivers do not even display the altitude value. Since GPS receivers are not accurate enough to measure altitude both indoors and outdoors, the actual altitude of the GPS receiver is calculated by integrating a pressure sensor into a smartphone using the correspondence between barometric pressure and altitude. Pressure sensors and GPS receivers obtain precise altitude information. At present, there are few pressure sensors on GPS receivers on the market, in fact, high-precision pressure sensors can also have a wide range of applications in GPS receivers.
At present, there are few pressure sensors on GPS receivers on the market, in fact, high-precision pressure sensors can also have a wide range of applications in GPS receivers. Consensic's high-resolution digital pressure sensor CPS123 has the advantages of small size, high accuracy, fast response, and is not affected by temperature changes. It is generally believed that a pressure sensor can only be used to measure the pressure of a gas, but it can also be used to measure the current altitude by using the correspondence between air pressure and altitude. Compared with conventional sensors, the pressure resolution has been increased from 0.1 mbar (1 m) to 0.024 mbar (20 cm), the temperature resolution has been increased from 0.01 °C to 0.002 °C, and the conversion time has been increased from 35 ms to 1 m. At the same time, the measurement range has been expanded from 10-1100 mbar to 10-1200 mbar. The accuracy has not improved, it is still +/- 1.5mbar. Power consumption has been reduced from 4μA to 1μA. CPS123, its 16-bit signals are all three-wire SPI transmission, 24-bit data can be selected SPI or I2C signal transmission. Mobile altimeter, barometer, weather monitoring system, multifunctional adventure watch, GPS navigator.
The CPS123 can also be used in this case, the digital pressure and altitude sensor module CPS123 is a new generation of high-resolution altimeter sensors with an I2C bus interface from Switzerland. It is optimized with an altimeter and variable inductor accuracy of 20mm. The sensor module includes a high-sensitivity pressure sensor and an ultra-low-power 24-bit delta-sigma ADC internal factory calibration factor. It provides an accurate 24-bit number and different modes of operating pressure and temperature values, allowing the user to optimize power consumption for conversion speed. The high-resolution output allows for the realization of any additional sensors for the thermoaltimeter/thermometer function. The CPS123 can also interact with almost any microcontroller. The communication protocol is simple and does not require programming of internal register devices. This new sensor module is built based on leading MEMS technology and the latest benefits of Swiss proven experience in high-volume production and technology altimeter modules that have been widely used for more than a decade. The sensor has very low hysteresis and highly stable pressure and temperature signals.
This pressure sensor can be used in a wide range of applications such as handheld altimeters and barometers, bicycle computers, adventure or multi-function watches, barometers, and data loggers.
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