Micro PNT system based on GNSS, chip atomic clock and micro inertial navigation

Abstract

The invention discloses a micro PNT system based on GNSS, chip atomic clock and micro inertial navigation. The system is based on DSP, FPGA, chip atomic clock and micro inertial navigation, and comprises a radio frequency front-end processing module, a baseband signal digital processing module, a micro inertial navigation module, a chip atomic clock module and a data processing module, wherein the radio frequency front-end processing module is used for performing amplification, frequency conversion, filtering and analog-digital conversion on satellite signals to obtain digital intermediate frequency signals; the baseband signal digital processing module processes the digital intermediate frequency signals to obtain navigation measuring values and navigation messages; the micro inertial navigation module performs calculation by a navigation algorithm to obtain navigation information; after being trained, the chip atomic clock module independently provides 1pps (pulse per second) for the data processing module to be used; the data processing module performs positioning calculation by using the navigation measuring values and the navigation messages, performs combined navigation by using satellite navigation data and inertial navigation data, and outputs position, speed, accelerated speed, posture and time information. The micro PNT system is applicable to high dynamic range, has small long-term drift and has the advantages of low cost, small size, low power consumption, light weight and plug and play effect.

Description

technical field [0001] The invention relates to the technical field of positioning, navigation and timing microsystems, in particular to a micro-PNT system based on GNSS, chip atomic clock and micro-inertial navigation. Background technique [0002] With the continuous development of society, people's demand for location and time information is becoming more and more intense. At present, the global satellite navigation system is gradually improving and improving. With many advantages such as convenience and unlimited number of users, it is the most cost-effective positioning, navigation and timing system. However, due to the physical characteristics of satellite navigation signals, their vulnerability is determined. In complex electromagnetic environments such as physically obstructed environments, electronic countermeasures, and spectrum countermeasures, the service performance will be severely degraded, or even fail to work. [0003] Therefore, the satellite navigation in...

AI Technical Summary

Problems solved by technology

The inertial navigation system is based on Newton's classical laws of mechanics. It uses accelerometers and gyroscopes to determine the position, velocity and attitude of the carrier through coordinate transformation and integral algorithms. By transmitting or receiving signals, the positioning and navigation functions can be completed through its own system, which has excellent autonomy and concealment, but its own errors will accumulate over time and cannot be corrected by itself. This fatal shortcoming makes independent The inertial navigation system cannot work for a long time

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