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Signal generator used for generating chaos radar signals in real time

A signal generator and radar signal technology, applied in the field of signal generators and radar signal generators that generate chaotic radar signals in real time, can solve the problems that pseudo-random signals are not suitable for real-time generation and are not suitable for long-term generation, and achieve good chaos. characteristics, low probability of interception characteristics, the effect of strong anti-interference ability

Inactive Publication Date: 2014-10-08
NAT SPACE SCI CENT CAS
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Problems solved by technology

However, due to the limitation of the transmission rate from the computer to the AWG and the limitation of the storage space of the AWG, the pseudo-random signal generated by this method is not suitable for real-time generation or long-term generation

Method used

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  • Signal generator used for generating chaos radar signals in real time
  • Signal generator used for generating chaos radar signals in real time
  • Signal generator used for generating chaos radar signals in real time

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Embodiment Construction

[0031] A signal generator for generating chaotic radar signals in real time according to the present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0032] A signal generator for generating chaotic radar signals in real time includes: a combined mapping chaotic phase modulation signal generator, a digital-to-analog converter, a low-pass filter and an intermediate frequency modulator. Such as figure 1 as shown,

[0033] In this embodiment, the generator of the combined-mapped chaotic phase-modulated signal may use an FPGA chip, and the FPGA chip generates digital signals of the in-phase component and the quadrature component of the combined-mapped chaotic phase-modulated signal through real-time calculation. The digital-to-analog converter converts the digital signal of the in-phase component and the quadrature component into an analog signal; the low-pass filter performs low-pass filtering on the analog signal, and ...

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Abstract

The invention provides a signal generator used for generating chaos radar signals in real time. The signal generator comprises a group-mapping chaos phase modulation signal generator, digital-to-analog converters, low pass filters and a medium frequency modulator. The group-mapping chaos phase modulation signal generator carries out real-time calculation to generate cophase-component digital signals and orthogonal-component digital signals of group-mapping chaos phase modulation signals. The digital-to-analog converters convert the cophase-component digital signals and the orthogonal-component digital signals into analog signals. The low pass filters carry out low pass filtering on the analog signals. The medium frequency modulator carries out medium frequency modulation on the analog signals obtained after low pass filtering to generate and output medium frequency signals. According to the signal generator, the good chaos characteristic can be kept under the small quantized word length through group mapping, and the generated chaos radar signals have the low-sidelobe performance and the good orthogonality and have the high anti-interference capacity and the low-intercept-probability characteristic.

Description

technical field [0001] The invention relates to the technical field of radar signal generators, in particular to the technical field of a signal generator for real-time generation of chaotic radar signals. Background technique [0002] Noise radar is a kind of radar that uses random signal or pseudo-random signal as the transmission signal. Due to the random nature of the transmission signal, noise radar has excellent low intercept probability performance and electronic anti-jamming ability. Its blur function is an ideal thumbtack type with high range and velocity resolution at the same time. Noise radar has extensive research in radar surveillance, tracking, SAR imaging, inverse SAR imaging, and through-wall radar. [0003] Early noise radars used electronic thermal noise as the noise source, and then filtered through a power amplifier and a low-pass filter to obtain the desired noise signal. The bandwidth of the noise signal was determined by the passband of the low-pass ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/02
CPCG01S7/02
Inventor 杨启伦张云华李冰洁
Owner NAT SPACE SCI CENT CAS
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