摘要
针对采用扩频增益作为GPS接收机抗干扰容限的非普适性和不确定性,通过建立压制干扰造成GPS接收机不同性能指标下降与分析对象之间的对应关系,将干扰威力区域用受扰区、半失效区和失效区来进行划分。结合GPS接收机工作原理,从理论上推导和分析了在连续波(CW)和宽带高斯噪声干扰下不同相关积分时间的接收机捕获、跟踪和解调等环节的性能下降到临界值时所需干信比。考虑干扰源高度与接收机天线增益的关系,对各威力区的有效干扰距离随干扰源发射功率变化情况进行仿真计算。仿真结果表明,随着干扰功率的提高,干扰源高度对有效干扰距离的影响在逐渐减小。在相同干扰功率下,CW干扰性能要优于宽带高斯噪声干扰。尽管增加接收机相关积分时间会使半失效区和失效区的范围减小,但却会引起受扰区范围显著增大。
Aim at non-universality and uncertainty of using spread spectrum gain as the anti-jamming tolerance of GPS receiver, the corresponding relationship between the performance decline of GPS receiver caused by the blanket jamming and analysis object is established in this paper in order to divide the effective jamming range of the blanket jamming into the disturbed area, the half failure area and the failure area. In combination with the structure of GPS receiver, the JSR required for the performance of capture, tracking and demodulation down to the critical value in both CW jamming and Gauss noise jamming is theoretically analyzed respectively in different integration time. Considering the relationship between jamming sources height and GPS receiver antenna gain, the change of effective jamming of each power area along with jamming sources transmitting power is simulated. The simulation results show that the influence of jamming sources height on effective jamming range decreases gradually with increase of the jamming power. Under the same jamming power, the effect of CW jamming is better than Gauss noise jamming. Although increasing integration time can make the range of the half failure area and the failure area reduce, it causes a dramatic increase in disturbed area.
出处
《宇航学报》
EI
CAS
CSCD
北大核心
2014年第9期1078-1086,共9页
Journal of Astronautics
基金
国家自然科学基金(61174194)
