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Multicarrier signal constant envelope modulation method

A multi-carrier signal, constant envelope technology, applied to radio wave measurement systems, instruments, etc.

Inactive Publication Date: 2016-03-16
HOHAI UNIV
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AI Technical Summary

Problems solved by technology

This method effectively solves the limitation of the operating frequency of the digital circuit, makes full use of the operating frequency of the DAC chip, and the problem of signal power amplification, and meets the generation requirements of constant envelope multi-carrier signals

Method used

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  • Multicarrier signal constant envelope modulation method

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Embodiment Construction

[0107] Such as Figure 1-Figure 13 As shown, a multi-carrier signal constant envelope modulation method includes the following steps:

[0108] Step 1, generating the same-direction component and the forward-direction component of the baseband chirp signal in four phases, specifically including:

[0109] (1a) generating the phase of the baseband chirp signal in four phases;

[0110] (1b) converting the four-phase phase of the baseband chirp signal into an amplitude, and generating the same direction component and the quadrature component of the baseband chirp signal;

[0111] Step 2, performing subcarrier modulation on the radar signal, specifically including:

[0112] (2a) Generate the phase of the radar subcarrier in four phases;

[0113] (2b) using the generated four-phase sub-carrier phase to modulate the generated four-phase baseband chirp signal onto the radar sub-carrier frequency;

[0114] Step 3, performing subcarrier modulation on the communication signal, specifi...

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Abstract

The invention discloses a multicarrier signal constant envelope modulation method. By using the method, technical problems that simultaneous emission of a plurality of carrier wave signals of a radar, communication, electronic interference and high-efficiency and undistorted power amplification are solved. The method can be widely used for signal modulation and power amplification of a radar, communication and electron interference integration system, and modulation and amplification of the plurality of carrier wave signals of a digital array module. A CORDIC algorithm and a multiphase processing technology are used. Base-band modulation of each carrier wave signal and synthesis of the plurality of carrier wave signals are completed. Amplitude-phase conversion and digital carrier wave modulation are performed. Constant envelope modulation and power amplification of the plurality of carrier wave signals of the radar, the communication, electronic interference and the like are realized. A sampling frequency of a signal is effectively increased and a bandwidth of signal processing is increased too. Through an amplitude phase conversion modulation technology, constant envelope modulation of the plurality of carrier wave signals of the radar and the communication is completed and the undistorted and high-efficiency power amplification of the plurality of carrier wave signals is realized.

Description

technical field [0001] The invention belongs to the technical field of array signal processing of phased array radar, and specifically relates to a digital array antenna-based multi-carrier signal modulation technology and an implementation method thereof. Background technique [0002] Phased array radars are widely used in multi-target search, tracking and weapon guidance. Existing phased array radars use single-carrier modulated waveforms, and the antennas are used in time-sharing in search, tracking, imaging, command guidance and other working modes. The time resources of the radar affect the multi-target capability of the radar. Therefore, in many tracking and guidance fire control radar systems, there are dedicated command guidance transmitting antennas to ensure that the time resources occupied by target search and tracking are maximized. However, the addition of command-guided transmitting antennas increases hardware equipment, reduces the reliability of the system, i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/282
CPCG01S7/282
Inventor 蒋德富钱荣高杨付伟
Owner HOHAI UNIV
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