Study On Antennas With High-precision Measurements For COMPASS

The satellite navigation and positioning technology is developing rapidly in this information expansion age and also applied in more and more wide field. In recent years it has extended to almost national economy sectors, already affects People's Daily life gradually. With the continuous advancement of satellite navigation technology, more and more countries have developed their own navigation systems. The high-precision terminal measurements belong to high-end products in satellite navigation application industry, which are mainly used for precision measurement of geodetic and precision engineering measurement. While as an important part of satellite navigation receiver, the performance of high-precision measurement antennas is directly related to the measurement accuracy of satellite navigation receiver. Antenna phase center variations and multipath effects are significant measurement error sources in high-precision satellite navigation system, meanwhile, the low elevation gain of the antenna affects receiver sensitivity. In order to meet to requirements of receiving antennas with the high-precision measurements, in this paper, single-frequency and double-frequency microstrip antennas have been designed which can work in COMPASS and optimized by simulation software of CST.Firstly, the working principle and application of satellite navigation system status of high-precision measurement of antenna,the current development of satellite navigation systems in our country are introduced. Secondly, the analysis method and the working principle of the microstrip antennas are introduced and include analyzing feed model,radiation parameters,circuit parameters,the basic design ideas and the calibration method of antenna phase center. Afterwards, a single-frequency circularly polarized microstrip antennas,dual-band and two- layer circularly polarized microstrip antennas are designed with the help of simulation of CST. The dual-band and two-layer circularly polarized microstrip antennas adopt four-fed point technique and feed-network is also designed. Meanwhile, the phase center is tested, The multi-fed point technique make the microstrip antennas phase center more stable, achieve the circular polarization In the wide-angle (AR<3dB). The results show it meets the requirements of practical application by RTK test. Lastly, the technical indexes of low noise amplifier are introduced, design and simulation of low noise amplifier are carried on with ADS.