Four-dimensional antenna array based secret communication system and method thereof
A secure communication and antenna array technology, applied in secure communication, diversity/multi-antenna system, space transmit diversity, etc., can solve the problems of limited capability of secure communication, two sets of antenna waveforms cannot be completely consistent, etc., to simplify the transmitter The effect of the system
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Embodiment 1
[0043] Using a four-dimensional antenna array to realize direction modulation and secure communication has the advantages of simple system structure, easy engineering implementation, and strong confidentiality ability. It is a novel secure communication method.
[0044] The invention moves the phase center of the antenna array by controlling the working time sequence of each antenna array, the modulation of the transmitted signal is completed at the antenna end, and the modulation of digital signals such as BPSK, QPSK and M spread spectrum sequences can be realized, and the signal waveform is related to the direction , so as to realize the direction modulation of the signal. The transmitted signal not only has different power levels in each direction, but also carries different information: in the direction of the desired receiver, the information to be transmitted is synthesized; in the other directions, the signal waveform is distorted and does not contain the information to ...
Embodiment 2
[0055] 20-antenna-element QPSK modulation based on SPDT switches.
[0056] To improve the basic scheme, it can be constituted as a reference Figure 5 The QPSK modulation system shown. In this embodiment, 20 omnidirectional antenna units are used to form a time-modulated antenna array. The transmitter system mainly includes an antenna array (1), a high-precision local oscillator (3), a power amplifier (4), a switch control circuit (5), a serial-to-parallel conversion unit (6), a phase shifter (7) and a single-pole Double throw switch (8), etc. The antenna elements of each channel are equally spaced at half wavelengths, and are labeled A to T. The 20 antenna units are divided into 4 sub-arrays, and each antenna sub-array is composed of 5 adjacent antenna units, and the antenna sub-array N is composed of antenna units 5(N-1)+1 to 5N (N∈{1,2, 3,4}). By adjusting the phase shifter 7 to make the main beam of each antenna sub-array point to the direction of θ=60°, the radiation...
Embodiment 3
[0060] M-sequence modulation of 10-way antenna elements based on single-pole double-throw switches.
[0061] In this embodiment, the directional modulation based on the four-dimensional antenna array is combined with the spread spectrum communication, and the spread spectrum sequence of M=7 is transmitted in the direction of θ=60°. Refer to the structure block diagram of the transmitter Figure 10 . The transmitter structure includes an antenna array (1), a high-precision local oscillator (3), a power amplifier (4), a switch control circuit (5), a phase shifter (7), a single-pole double-throw switch (8), and a spread spectrum Encoding circuit (9). The antenna array is composed of omnidirectional antennas with 10 antenna units separated by half wavelength. The 10 antenna units are divided into 2 antenna sub-arrays, and each antenna sub-array is composed of 5 adjacent antenna units. The main beam of the antenna sub-array points to the direction of θ=60°, and the radiation cha...
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