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A novel center-fed Global Navigation Satellite System (GNSS) antenna is proposed in this paper. The antenna is composed of two layers of microstrip patches, a folded ground plane and three choke rings. Simulated and measured results show that two frequency bands for return loss >10 dB cover GPS L2 (1.193∼1.247 GHz) and GPS L1 (1.545∼1.625 GHz) with good axial ratio (AR) performance. The radiation...
Aiming at the GPS in-band interferences, an adaptive time-space anti-jamming scheme based on adaptive antennas is proposed in this paper. It can effectively suppress the narrowband interference and wideband interference in GPS interferences simultaneously with the adaptive time-domain notch filtering canceling the narrowband interference and the power inversion algorithm suppressing the spatial interferences...
With the development of the GIS and Compute technologies, the Vehicle Navigation System (VNS) is used widely now, however, the traditional VNS is not intuitive and imaginable enough for users. To solve this problem, a novel vehicle navigation system based on multiple-source data is researched in this paper. An improved architecture based on the traditional system is purposed by adding a multi-source...
A lightning radiation electromagnetic field data acquisition and processing system based on LabVIEW is proposed in this paper. This system can acquire two channels of magnetic field signal and one channel of electric field signal simultaneously. The sampling rate of the system can reach up to 20 MS/s, and this value can be adjusted according to the requirement of the different measurement tasks. The...
It is obvious that the Geography Information System (GIS) have potential effect on regional economic development. Real-time monitoring system of farmland information is the basis to achieve ldquoprecision agriculturerdquo. The digital collection device for dynamic monitoring of agriculture resources and information dissemination process is studied in this paper. A novel embedded mobile information...
Trajectory correction is a crucial method which can improve shooting precision of ammunition, and it is developing energetically new technology for fuze to implement modification of trajectory by fuze technology abroad. Based on the research of smart ammunition, a new trajectory correction fuze of infrared imaging with the help of GPS and precision exploding point control technology is proposed in...
This article introduces remote control system for motion of projectile of infrared imaging fuze based on GPS and navigation technology, which is composed of GPS receiver, navigation sensor part, DSP data processor, wireless communication part, motion visual part and other parts. Observer on earth could inspect real time track of projectile compared with theoretical data at a special point of the trajectory...
This paper analyzes the sensitivity of delay lock loop (DLL) of GPS receiver to thermal noise, interference, and multipath. Analytical expressions apply for various correlator spacings and front end bandwidths. Remarkable performance advantages over the conventional one chip correlator spacing is shown
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