在这种情况下，最主要的可能性是这道信号来源于一个一颗GPS卫星和未确认的地球发射源之间的不寻常的调制信号。

In this case, a leading possibility is that the signal originates from an unusual modulation between a GPS satellite and an unidentified Earth-based source.

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非线性放大器对发射信号的影响，与调制方式密切相关。

Non - linear amplifier on the transmIt 'signal of the impact is closely related with the modulation method.

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塔康信标台全向发射脉冲幅度调制信号，隐含空中目标相对于信标台的方位和距离信息。

TACAN beacon transmits pulse amplitude modulation signals in all direction, including bearing and distance information relative to the beacon.

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