Pseudo-satellite based intra-tunnel positioning method
A positioning method and pseudolite technology, which is applied in the field of positioning and navigation in tunnels, can solve problems such as inconvenient positioning in tunnels, and achieve seamless switching, good user experience, and high compatibility
Active Publication Date: 2018-12-18
格星微电子科技成都有限公司
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Problems solved by technology
[0004] Aiming at the above-mentioned deficiencies in the prior art, a positioning method in a tunnel based on a pseudolite provided by the present invention solves the problem of inconvenient positioning in a tunnel
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[0065] The specific embodiments of the present invention are described below so that those skilled in the art can understand the present invention, but it should be clear that the present invention is not limited to the scope of the specific embodiments. For those of ordinary skill in the art, as long as various changes Within the spirit and scope of the present invention defined and determined by the appended claims, these changes are obvious, and all inventions and creations using the concept of the present invention are included in the protection list.
[0066] like figure 1 As shown, the pseudolite-based tunnel positioning method includes the following steps:
[0067] S1. Set m sets of pseudolites in the tunnel to form m positioning cells, and set the preset positioning coordinates of each set of pseudolites as the center of the positioning cell corresponding to the pseudolites, wherein each set of pseudolites simulates at least four in-orbit satellite;
[0068] S2. Send...
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The invention discloses a pseudo-satellite based intra-tunnel positioning method. The method comprises the following steps: S1, m sets of pseudo satellites are arranged in a tunnel to form m positioning cells; S2, the ephemeris and the time of the satellites inside and outside the tunnel are kept consistent; S3, each set of the pseudo satellite is enabled to simulate on-orbit satellite signals outside the tunnel; S4, a Doppler frequency corresponding to a simulated speed of a vehicle is additionally arranged on a carrier of each set of pseudo satellite, and a corresponding satellite signal issynthesized by the frequency; S5, a vehicle positioning result is calibrated; and S6, the pseudo satellite which conducts data interaction with the vehicle is switched to the pseudo satellite in the next positioning cell according to the satellite signals and the vehicle positioning result, and uninterrupted positioning of the vehicle in the tunnel is realized. The Doppler frequency on the carrierin the pseudo satellite is adjusted, so that the change of the position fingerprints can be fast and accurate, position fingerprints in the tunnel are formed, and the problem that satellite positioning and navigation are difficult to realize in the tunnel is solved.
Description
technical field [0001] The invention relates to the field of positioning and navigation in tunnels, in particular to a pseudolite-based positioning method in tunnels. Background technique [0002] With the development of transportation construction, the construction route gradually advances from plains to mountainous plateaus, and the number of tunnel construction projects increases very rapidly. Tunnel engineering has significantly improved the transportation capacity, but the operation and management in the tunnel is relatively complex, the construction environment is harsh, and the accident rate is high. On the other hand, due to the obstruction of satellite signals by reinforced concrete, it is usually difficult for managers to control the state inside the tunnel in real time. When encountering unexpected accidents such as car accidents, it is difficult for the rescue department to obtain the exact location of the disaster scene, which will delay the timing of emergency...
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IPC IPC(8): G01S19/42
CPCG01S19/42
Inventor 王炫熹李中传肖文平文志权
Owner 格星微电子科技成都有限公司