Jimi Electronic- Professional Wireless Smart Devices

Comments

Post a Comment

Popular posts from this blog

GPS tracker-based positioning solutions

Image
Enhanced client-assisted GPS positioning The enhanced client-assisted GPS positioning technique is a hybrid between autonomous GPS and server-assisted GPS. This type of solution is similar to the serverassisted GPS, with the location server providing the mobile unit with a list of visible satellites on demand. However, in an enhanced client-assisted system, the mobile unit does the complete PVT calculation rather than sending pseudorange information back to the location server. This technique essentially requires the same processing power and capabilities as an autonomous  GPS solution , in addition to a communication link between the mobile unit and the location server. However, the amount of time required to complete the PVT calculation is much less than with an autonomous GPS solution, because of the satellite view information provided by the location server, and fewer exchanges with the location server are required than with a server-assisted solution. Dead reckoning ...
Read more

System level solutions for GPS tracker

Image
When access to the GPS first became available for military and commercial use, only a few companies had the technology and expertise to develop reliable, accurate  GPS Tracking Device  . Application developers who needed GPS services would simply purchase a board level solution from a GPS supplier, and integrate it into their design. In the past, GPS correlators were designed with a single channel, which was multiplexed between each SV signal being received. This resulted in a very slow process for calculating a position solution. Today, systems come with up to 12 channels, allowing the correlator to process multiple SV signals in parallel, achieving a position solution in a fraction of the time. Also, while the correlator functionality is sometimes performed in software using a high-performance digital signal processor (DSP), the real-time processing requirements and repetitive high rate signals involved make a hardware correlator solution ideal, from both a cost and through...
Read more

Some major component of GPS

Image
GPS might be divided up in the following way: The Earth The first major component of GPS is Earth itself: its mass and its surface, and the space immediately above. The mass of the Earth holds the satellites in orbit. From the point of view of physics, each satellite is trying to fly by the Earth at four kilometers per second. The Earth’s gravity pulls on the satellite vertically so it falls. The trajectory of its fall is a track that is parallel to the curve of the Earth’s surface. The surface of the Earth is studded with little “monuments”– carefully positioned metal or stone markers–whose coordinates are known quite accurately. These lie in the “numerical graticule” which we all agree forms the basis for geographic position. Measurements in the units of the graticule, and based on the positions of the monuments, allow us to determine the position of any object we choose on the surface of the Earth. Earth-Circling Satellites The United States GPS design calls for a t...
Read more