Satellite navigation positioning receiver and method for improving positioning precision of receiver
A satellite navigation and positioning accuracy technology, applied in the field of satellite navigation and positioning, can solve problems such as errors, achieve accurate pseudo-range values, accurate signal propagation time values, and improve accuracy
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Embodiment 1
[0046] This embodiment provides a method for improving the positioning accuracy of a satellite navigation positioning receiver, such as figure 2 Shown, including S21-S22:
[0047] S21. The receiver predetermines a reference satellite, and after the frame synchronization is completed, samples the signals of all satellites, and counts the sampling values;
[0048] S22. Calculate the propagation time differences between other satellites and the reference satellite according to the statistical sampling values, and calculate the signal propagation time of each other satellite based on the signal propagation time of the reference satellite.
[0049] By adopting the above method, the error introduced when using the receiver time to calculate the propagation time of the satellite signal in the prior art is avoided, and the accuracy of the measured value of the satellite navigation and positioning receiver observation can be improved, thereby improving the positioning accuracy of the ...
Embodiment 2
[0062] This embodiment specifically describes the methods in the above embodiments. Such as image 3 shown, including the following steps:
[0063] Step S31, the receiver performs signal locking;
[0064] Step S32, judging whether the frame is synchronized, if yes, execute step S33, otherwise return to step S31;
[0065] Step S33, determining the subframe number;
[0066] Each GNSS system is adjusted by the ground monitoring part to ensure that the difference between the clock of each satellite in the system and the time of each system is maintained within 1us, so each satellite basically starts to transmit the start edge of their subframe at the same time. However, due to the different distances between the receiver and each satellite, and the existence of delays such as ionospheric delay and tropospheric delay, the time at which the receiver receives the start edge of the subframe is different. In fact, the signal start edge of the satellite closer to the receiver arrive...
Embodiment 3
[0082]This embodiment specifically describes the methods in the above embodiments. In this embodiment, a dual-mode system receiver composed of GPS and BDS is taken as an example to calculate the signal propagation time of GPS satellites with the aid of BDS, and finally complete the calculation of pseudo-range. It should be clarified that the method in this embodiment is not limited to the receiver of the dual-mode system, but can also be applied to the receiver of the multi-mode system. And in the actual operation process of the multimode receiver, there is no distinction between the main system and the auxiliary system, but mutual assistance.
[0083] According to statistics, the shortest distance between the GPS satellite and the receiver on the earth's surface is 20192km, and the longest distance is 25785km. According to formula (1), it can be seen that the propagation time of the GPS satellite signal is 67ms-86ms, that is, the time difference between the signals sent at t...
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