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In recent years, low-orbit navigation enhancement system has been gradually incorporated into the construction of integrated PNT system, and the capture and tracking of low-orbit signals has gradually become a hot research issue. In the scenario that the integrated PNT application terminal needs to receive BeiDou + LEO navigation augmentation signals at the same time, due to the large resource consumption of the capture module, using two sets of hardware resources to compatibly receive high, medium and low orbit-signals will cause a great waste of resources, and it is not possible to realize the small size and low power consumption requirements of the user terminal. This paper further optimizes the algorithm on the basis of the existing BeiDou signal capture module, and through the design of flexible and reusable matched filter plus FFT structure, on-chip distributed processing and off-chip ultra-long storage architecture, and techniques such as high Doppler pseudo-code, carrier frequency compensation, etc., it realizes the compatible reception of high, medium and low-orbit signals, and at the same time, it can realize the capture of high and medium orbit BeiDou B1C signals with a capture sensitivity of -145 dBm capture sensitivity and 40 kHz STL burst signal in low orbit.
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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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