Method for generating orthogonal phase coded signal

A coded signal and quadrature phase technology, which is applied in the field of radar communication, can solve the problems that the zero-point orthogonality cannot be guaranteed, it is difficult to adapt to the number of symbols and signals, and the amount of calculation is large, so as to achieve the effect of small calculation cost

Inactive Publication Date: 2012-02-15
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

These methods require a large amount of calculation, and it is difficult to adapt to the situation where the number of symbols and the number of signals are large.
At the same time, the orthogonally coded signals obtained by these methods have good autocorrelat

Method used

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  • Method for generating orthogonal phase coded signal
  • Method for generating orthogonal phase coded signal
  • Method for generating orthogonal phase coded signal

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Embodiment Construction

[0026] For a better description, the following definitions are first made:

[0027] MIMO radar: Multiple-input multiple-output radar, that is, a radar with multiple transmit antennas and multiple receive antennas. It can be regarded as a further development of phased array radar, and the signal waveform emitted by the radar has strong flexibility and is easy to expand. In general, the signal waveforms emitted by this radar need to have good orthogonality characteristics.

[0028] Phase encoded signal: The carrier of each symbol of the transmitted signal is the same signal waveform, and the encoded part is the initial phase amount of the carrier signal of each symbol.

[0029] Zero-point orthogonality: Digital cross-correlation processing is performed between the signals transmitted by each (two or more) channels of the radar without delay, and the output cross-correlation diagram is at the zero offset point of the signal (the signals are completely aligned) If the level is 0...

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Abstract

The invention relates to the technical field of radar communication and discloses a method for generating an orthogonal phase coded signal. The method specifically comprises the following steps of: 1, constructing a Walsh orthogonal matrix; 2, generating a chromosome code; 3, forming an initial population and decoding; 4, calculating a sum E of self-correlation side lobe energy and cross-correlation energy of a signal obtained by decoding the chromosome code in the population; 5, selecting an individual of which the E is small; 6, performing interlace operation on the individual; 7, performing mutation to generate a new individual; and 8, updating the population and repeating the operation in the steps from 4 to 7, and thus obtaining the best chromosome. The orthogonal matrix is subjectedto random column rearrangement and random row extraction by using a genetic algorithm, so the self-correlation side lobe energy and the cross-correlation energy of the orthogonal signal can be optimized on the premise of no change of the zero orthogonality, and the orthogonal phase coded signal with high performance can be acquired with lower calculation cost.

Description

technical field [0001] The invention belongs to the technical field of radar communication, in particular to a method for generating quadrature phase coded signals. Background technique [0002] Multiple-input multiple-output (MIMO) radar has good anti-intercept performance and low, small, and slow target detection capabilities, and can effectively solve the problems faced by traditional phased array radars, such as battlefield survival and stealth target detection. It is a key point in the development of radar technology. New Direction. [0003] Since the signals emitted by MIMO radar are generally orthogonal signals, they cannot be coherently superimposed in space to form a high-gain narrow beam, but a low-gain wide beam, so that the signal is not easy to be intercepted. The signal received at the receiving end is the sum of the signal delays of each transmission channel, and the orthogonal signal components of each channel are recovered through matched filtering of each ...

Claims

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Application Information

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IPC IPC(8): G01S7/02
Inventor 李军刘红明何子述孙颖刘娜严济鸿左洪成
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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