Development Of Constant Temperature And Ant-jamming System For GPS Antennas

In order to improve the performance and precision of time comparison ,theconstant temperature system and anti-jamming system for GPS antenna are studied inthis paper. That work is also an important part of "the development of constanttemperature control system matched in the antenna of GPS receiver "project, whichis a sub-project of "Joint of Atomic Time of China"( one of the importantly directionalprojects of CAS knowledge innovation engineering). At the same time, in associationwith the demand of "the research about long distance time comparison with GPScarrier phase" project, the choke ring and temperature constant box of antenna havebeen developed. It has proved that the developed choke ring can effectively weakenthe impact of interfered signal (including multi-path signal) on time comparison. Thecontrol precision of temperature in constant temperature box is not more than 1℃,and the result achieves the demand of design. The main contributions of author's workare as follows:1. GPS Common-View time transfer is introduced and the main error sources inGPS CV are deeply analyzed.2. The hardware composition, the software design, the algorithm of temperaturecontrol and the development of constant temperature box of antenna for GPSCV receiver are particularly described. The experimental data is given.3. The principle and characteristic of multi-path effect as well as consequences ofmulti-path reception are introduced in this paper. The methods for mitigatingthe multi-path errors are described. The design and development of choke ringof antenna is introduced and the experimental data is given at last.