Method for transmitting multi-beam formation and receiving signal processing simultaneously
A technology for receiving signal processing and transmitting signals, applied in the field of phased array radar, which can solve problems such as poor anti-interference ability, reduced radar angle measurement accuracy, and difficult to change
Inactive Publication Date: 2014-10-29
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology
For the former, the simulation method implemented by hardware, once the multi-beam network scheme is determined, the beam shape and beam pointing etc. are fixed and not easy to change
In particular, it cannot adaptively form multiple beams, and the anti-interference ability is very poor
For the latter, the radar antenna array is divided into L sub-arrays, and each sub-array forms a beam independently. In this way, the energy of the radar transmitter is not fully utilized, and the aperture and peak transmission power of the antenna are reduced to 1 before the division. / L, which greatly reduces the angle measurement accuracy of the radar
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[0018] The present invention will be described in detail below in conjunction with the accompanying drawings and examples.
[0019] The present invention provides a method for simultaneously transmitting multi-beam forming and receiving signal processing. Two phase-weighted orthogonal code waveforms are linearly synthesized at the transmitting end of the array antenna and amplified by a linear power amplifier before being transmitted by the antenna array element. , beams with different orientations can be obtained. The receiving antenna receives the signal reflected by the far-field target, and then the two transmitted signals can be separated through matched filter matching processing.
[0020] A method of simultaneously transmitting multi-beam forming and receiving signal processing of the present invention, the specific steps are as follows:
[0021] Step S1: Select two sets of finite-length orthogonal polyphase codes, and the selection of the orthogonal codes follows the ...
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The invention provides a method for transmitting multi-beam formation and receiving signal processing simultaneously. The method comprises the following steps: selecting two groups of orthogonal multi-phase codes; modulating the medium-frequency sine signals of two groups of orthogonal multi-phase codes respectively by using a direct digital frequency synthesizer specific to each array element of a radar array antenna to obtain a first transmission signal waveform and a second transmission signal waveform; overlapping the produced first transmission signal waveform and second transmission signal waveform, performing frequency up-conversion to a required radiofrequency waveband, amplifying by using a linear power amplifier, and outputting to an antenna for transmitting; receiving an echo signal reflected by each transmission signal through a far field target by using the receiving end of a receiver; matching the receiving end with the echo signal respectively by using two matched filters, separating two groups of transmitted signals, transmitting obtained echo information to a data processing portion at the back end of the receiver for processing to obtain target information.
Description
technical field [0001] The invention belongs to the technical field of phased array radar, and in particular relates to the technology of simultaneously transmitting multi-beam formation and receiving end signal waveform separation of digital array radar. Background technique [0002] Phased array radar, also known as phased array radar, is an electronically scanned array radar that changes the beam pointing by changing the phase of the transmitted signal. Compared with radars whose antennas scan mechanically, the biggest difference is that the antenna beam can be scanned quickly without turning the antenna. [0003] Another advantage of phased array radar is that it is easy to form multiple beams. This advantage brings many new potentials to the performance of phased array radar: expanding the radiation coverage of the radar antenna to improve the search and tracking data rate; / Multistatic radar networking, etc. Digital Array Radar (Digital Array Radar) is a fully digita...
Claims
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IPC IPC(8): G01S7/02
CPCG01S7/28G01S7/2813
Inventor 曾祥东魏国华张存魏志龙邹林
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA