GNSS receivers are mainly used in the following industries:
1. GNSS satellite positioning technology in modern military and civilian applications;
2. GNSS high-precision engineering project measurement, such as accurate measurement of highway bridges and housing construction, provides a solid guarantee for economic and social development;
3. GNSSGPS navigation service project, providing high-quality and high-efficiency vehicle real-time navigation service project for many transportation departments;
4. GNSSGPS navigation network services provide consumers with navigation data and help enterprises realize data transmission.
(Beitian GNSS receiver BT-200G)
The GPS receiver is an integral part of the GPS system, and the GPS receiver is identified based on receiving satellite data signals. GPS receivers are divided into three types according to the received satellite data signals:
1. The number of visible satellites: the number of satellites that a specific device can receive within a certain period of time, which indicates whether the satellites are visible to the receiver. If a receiver only tracks 4 satellites within a certain period of time, it is considered that the number of the receiver is 4, and if more than 30 satellites are tracking within a certain period of time, it is considered that the number of the receiver is 30.
2. Pseudo-range error: refers to the angle between the instantaneous phase difference of the data signal arriving at the receiver and the position at this stage. The pseudo-range error is positively correlated with the network signal. When the network signal reaches a certain value (about 10~100 dbm), the error will no longer decrease with the increase of the distance.
3. Carrier operating frequency error: refers to the error between the carrier operating frequency and the signal frequency. The operating frequency of the carrier refers to the percentage of time that the carrier occupies in the navigation message, and its unit is HZ.
There are two types of GPS positioning technology:
1. Passive measurement: Determine the position by measuring the time required for the satellite data signal to reach the client receiver. This method is also called geometric measurement. For this type of measurement, a satellite positioning instrument is required for measurement.
2. Active measurement: Active measurement determines its position by the position information transmitted in the navigation message. The characteristic of this type of measurement method is that it measures the position of GPS satellites all over the world at the same time, and the precision is relatively high, but it can only be achieved by forming a system composed of two or more receivers.