Low Cost MEMS only DR (MoDR) Solution using GNSS and MEMS INS Sensor

摘要

Recently GNSS performance is dramatically improved still weak signal areas or GNSS performance in the downtown location is unstable, underground or long tunnel due by the structure such as a continued increase in own GNSS performance, the availability level that customers demand it is difficult to satisfy. To address this, the best way to cover the weakness of GNSS is supplemented with inertial navigation sensors. It will typically using a technique known as INS or DR to stabilize the performance of the GNSS and provide continuous position where the GNSS solution is not covered. Recently, the inertial sensors used for commercial solutions have shown a big change for many years. Conventional analog inertial sensor has been employed for the simplest structure using only one-axis gyro because the problem was difficult because of the size and the price-to-use multi-axis sensor, even size constraints. However, with advances in semiconductor technology that employs a MEMS inertial sensor structures had started to spread digital inertial sensors, MEMS sensors has begun to show in the form of an integrated multi-axis sensor type by default. Changes of this type was a chance to apply three or more axes in commercial navigation solution such as the above end. By default, after the time when he used to employ three-axis gyro sensor last, it goes employing a three-axis acceleration sensor again most recently, and naturally 3-axis gyroscope and 3-axis acceleration sensor was integrated in one MEMS INS sensor and it began to be applied to the complementary GNSS navigation. After all these changes has been reached the conventional analog contact method GNSS + DR in non-contact implementation of GNSS in digital form. The emergence of contactless GNSS + DR is bringing significant changes to the existing GNSS market. The center of these changes is the convenience on the user side of the applicability of the solution, which has become an instrument that is very diverse and large applications. Due to this occasion, Telit, leading global GNSS market, launched 'MEMS only DR' Solution, so-called contactless GNSS + DR. The contactless means not using wheel tick signal from vehicle.