Modulation method and device for dual unbalanced quadrature phase shift keying signal
A quadrature phase shift keying and unbalanced technology, applied in the field of satellite navigation, can solve problems such as unrealizable
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[0073] The present invention will be described in detail below with reference to the accompanying drawings by taking the satellite navigation service signal using the direct sequence spread spectrum technology as an embodiment.
[0074] Four channels of binary spread spectrum signals are known, and the binary spread spectrum signals may include information such as spread spectrum codes, binary offset carriers, navigation messages, and secondary spread spectrum codes. Let S 1 (t) is the amplitude of the first binary spread spectrum signal at time t, S 2 (t) is the amplitude of the second binary spread spectrum signal at time t, S 3 (t) is the amplitude of the third binary spread spectrum signal at time t, S 4 (t) is the amplitude of the fourth binary spread spectrum signal at time t, the amplitudes of the four binary spread spectrum signals are all +1 or -1, and the four binary spread spectrum signals are not correlated with each other. The first binary spread spectrum signa...
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