| 摘要: |
| 提出了一种提高船舶自动识别系统(AIS)信号检测性能的设计方法，主要包括两部分算法：
一部分是针对AIS系统
的码间串扰，采用基于GMSK调制方式的Viterbi解调算法；另一部分是针对AIS报文长度的不
固定，采用报文自动检测算法。在设计过程中，依据软件无线电设计思想，将基于GMSK调制
方式的Viterbi解调算法和报文自动检测算法组合成的设计方法，应用在Spartan-6系列的FP
GA和
简单外围电路组成的双通道AIS中频数字化接收机中，从而提高了AIS信号检测性
能，使得中频信号载噪比大于10 dB时，误码率小于10-4。 |
| 关键词: 船舶自动识别系统 中频数字化接收机；信号检测；Viterbi解调
算法 报文自动检测 软件无线电 |
| DOI： |
|
| 基金项目: |
|
| A design method for improving detection performance of AIS signal and its application |
| YAO Yuan-fei,GONG Yu-chao,TONG Li |
| () |
| Abstract: |
| This paper presents a design method for improving Automatic Identification Syste
m(AIS) signal detection performance which mainly includes two parts of algorithm
. For the inter-symbol interference of AIS, the Viterbi demodulation algorithm b
ased on GMSK modulation is adopted. For the variable length of AIS packet, the p
ackets automatic detection algorithm is used. In the design process, according t
o software radio design idea, the design method combing GMSK modulation Viterbi
demodulation algorithm and automatic detection algorithm is applied in the doubl
e-channel AIS IF digital receiver composed of Spartan-6 series of FPGA and simpl
e circuit, and the AIS signal detection performance is improved. The bit error
rate(BER) is less than 10－4when the IF signal carrier-to-noise ratio
is greater than 10 dB. |
| Key words: AIS IF digital receiver signal detection Viterbi demodulation algorithm autom
atic message detection software radio |
