Full
SU Jia, PhD, professor, majorsin wireless communication technology andtarget detection andtracking, E-mail:sujia@hebust.edu.cn
Outline
Aiming at the problems of poor positioning accuracy, slow convergence speed, and large influence of clock drift in the case of single-satellite positioning methods, a joint pseudo-ranging/Doppler positioning model with clock-difference correction is proposed, which combines the mathematical model of clock-difference with the pseudo-ranging observation equations and Doppler observation equations, and eliminates the influence of the change of the receiver's clock-difference on the positioning accuracy through the simultaneous estimation of clock drift by the mathematical model of clock-difference and the Doppler observation equations. The proposed method is validated in a simulation scenario, and the results show that the optimal positioning accuracy of the pseudorange/Doppler joint positioning with clock difference correction can reach 219 m under different working conditions, which is 59.4% higher than that of the Doppler localization method; when the pseudorange measurement error is 1 m, the positioning accuracy can be up to 169 m, and the convergence time is around 300 s; when the frequency measurement error is 0.5 Hz, the positioning accuracy can be around 140 m.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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