还有另外一问题：需要增进调谐到一个单边带信号的技能。
There is one other problem: the increased skill that is needed to tune into an SSB signal.
现有的车载短波单通道测向设备使用传统测向算法，对单边带信号的测向结果比较差。
Using the traditional algorithm, the vehicular short-wave single-channel direction finding devices can not cope with the single side band signals satisfactorily.
检测双边带信号通过窄带FBG滤波后，成为单边带信号的光谱图，结果基本符合分析预期。
Since results in line with expectations, it preliminarily prove that use of narrow-band FBG to realize SSB in RoF can inhibiting decay caused by dispersion better.
单边带信号在短波频段内十分拥挤，因此要接收单边带信号就需要一个高抗干扰的通信接收机，过去由于器件的落后，直接影响先进方案的实施。
SSB signals become very crowed in short-wave frequency range, so a good anti-noise communication receivers is needed to receive SSB signals.
其思路是将信号先通过单边带调制，将较低频率调制到需要的频率范围；然后采用对基带信号的数字预补偿方法来抑制镜像频率和载波泄漏，从而达到应用的目的。
Then we perform digital pre-compensation method, which can be used in the processing of base band signal to reject image frequency and protect carrier leak to meet the application purpose.
其思路是将信号先通过单边带调制，将较低频率调制到需要的频率范围；然后采用对基带信号的数字预补偿方法来抑制镜像频率和载波泄漏，从而达到应用的目的。
Then we perform digital pre-compensation method, which can be used in the processing of base band signal to reject image frequency and protect carrier leak to meet the application purpose.
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