Aiming at the problems of difficult track initiation and high missed detection rate in dense clutter environment, this paper presents a method of multi-target hypothetical track initiation based on motion characteristics. Most of the traditional track initiation algorithms use the sequential start method, which has a great dependence on time. In this paper, a variety of hypotheses are generated by directly judging the correlation of the point track data, and the final track information is obtained by screening the formed temporary track according to the kinematic characteristics of the target. Experiments show that this method not only greatly improves the accuracy of track initiation in dense clutter environment and reduces the missed detection rate, but also has strong adaptability to track initiation of massive data.
As a new type of modern modulation technology, much attention has been attached to binary offset carrier (BOC) modulation due to its characteristics of band sharing and spectrum separation for military and civilian signals. Basically, it is essential to investigate BOC modulation with jamming to defend various types of jamming which guarantee the safety and reliability of the satellite navigation system. In this paper, the transmitter and receiver of BOC modulation is given, and we propose a mathematical model for BOC modulation and demodulation. In addition, the error probability is derived for BOC modulation with jamming in AWGN channel. Furthermore, the mathematical analysis is verified by simulation results for non-jamming situations. In jamming cases, the single-tone jamming and the multi-tone jamming are considered.
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