A Calculation Method of Detection Probability of Spaceborne AIS System Based on Power Difference
A calculation method and detection probability technology, applied in the field of detection probability calculation of spaceborne AIS system based on power difference, can solve problems such as AIS signal conflict, describe the overall performance of the system, affect the performance of spaceborne AIS demodulation, etc., and achieve good practical performance , the effect of effective performance evaluation
Active Publication Date: 2020-09-15
SHANGHAI SPACEFLIGHT INST OF TT&C & TELECOMM +1
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Problems solved by technology
Compared with the shore-based AIS system, due to the wider coverage of the space-borne AIS system, the collision of the AIS signals received by the satellite is more serious, which seriously affects the demodulation performance of the space-borne AIS
At present, the theoretical detection probability model used in the spaceborne AIS system can only roughly describe the overall performance of the system. In the case of multiple signal conflicts, the calculation of the detection probability of these systems is simply based on the number of signal conflicts, which is not very good. Guidance for the realization of practical AIS system engineering
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Embodiment 1
[0051] Usually, the space-borne AIS system has a wide observation range. In waters where ships are densely populated, the space-borne AIS system will receive multiple AIS signals from different cells at the same time. These signals form conflicting signals at the satellite receiving end, which seriously affects the Demodulation performance of satellite receivers. Since the arrival time of different AIS signals at the satellite receiving end may be different, the signal conflicts at the satellite receiving end are usually divided into two categories:
[0052] Multiple ships choose the same time slot to send signals and arrive at the satellite receiving end in the same time slot, forming the first type of signal conflict, such as figure 2 In the first type of conflict shown;
[0053]Different ships choose different time slots to transmit AIS signals. Due to the space propagation delay, these AIS signals reach the satellite receiving end in the same time slot. Overlap occurs, ...
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The invention relates to the field of satellite communication, in particular to a satellite-borne AIS detection probability calculation method based on power differences. The method comprises the following steps: signals with different power difference values are superposed, and a total signal power of the different signals arriving at a satellite receiving end is calculated, so that conflicting signals are generated; demodulation calculation is carried out on the conflicting signals, and statistics is carried out on demodulation probabilities of the signals; and an overall detection probability of a satellite-borne AIS is calculated according to the demodulation probabilities subjected to the statistics. The method has the advantages that performance assessment for the satellite-borne AIS can be more effectively carried out, and the real performance of the satellite-borne AIS can be better reflected.
Description
technical field [0001] The invention relates to the field of satellite communication, in particular to a method for calculating the detection probability of an on-board AIS system based on a power difference. Background technique [0002] In recent years, the maritime economy has become more and more important, and maritime transportation activities have become increasingly frequent, and it has become very important to strengthen maritime ship management. Automatic Identification System (AIS, Automatic Identification System), as a navigational aid and collision avoidance tool, has been widely used in maritime ship supervision to maintain the safety of ships at sea. [0003] As an important technical index of the spaceborne AIS system, the ship detection probability is an important certificate to measure the performance of the spaceborne AIS system. Compared with the shore-based AIS system, due to the wider coverage of the space-borne AIS system, the collision of the AIS sig...
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IPC IPC(8): H04B17/40
CPCH04B17/40
Inventor 李洪星侯金成姚崇斌李屹周少骞陈萍
Owner SHANGHAI SPACEFLIGHT INST OF TT&C & TELECOMM