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Generating method for linear digital frequency modulation signal

A technology of digital frequency modulation and generation method, applied in frequency modulation carrier system, radio wave reflection/re-radiation, radio wave measurement system, etc. Avoid the effect of increasing storage capacity, reducing storage space, and improving computing efficiency

Inactive Publication Date: 2005-07-27
WUHAN UNIV
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Problems solved by technology

However, with the improvement of frequency resolution, the corresponding storage capacity will also increase, and because DDS generally adopts phase truncation technology, it introduces spurious signals into the output signal.
On the other hand, the current digital signal processor (Digital Signal Processor, DSP) can work at a very high frequency, so high-frequency signals can be generated digitally, but the calculation and addressing of the sine function still takes up a large number of clock cycles, which Make DSP work inefficient

Method used

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  • Generating method for linear digital frequency modulation signal
  • Generating method for linear digital frequency modulation signal
  • Generating method for linear digital frequency modulation signal

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Embodiment Construction

[0027] figure 1 It is the principle block diagram of the present invention, and 2 is the hardware principle diagram of the present invention: The method for generating linear digital frequency modulation signals of the present invention uses recursive feedback to generate a basic digital sample sequence, and then performs amplitude compensation on the generated basic digital sample sequence. Make the output chirp signal a constant amplitude oscillation signal. The specific digital sample sequence is generated by using a self-excited second-order IIR filter to generate a basic digital sample sequence, and then amplitude compensation is performed on the generated basic digital sample sequence, so that the output chirp signal is a constant amplitude oscillation signal, and the hardware is used on site Programmable logic array implementation.

[0028] 1. The principle of the method of the present invention:

[0029] The frequency of the chirp signal changes linearly with time and is...

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Abstract

A method for generating linear digital frequency-modulated (FM) signal includes generating basic digital specimen by second order IIR filter and using formula T[N]=2*A[n]*Y[n-1]-Y[n-2] to list it out as Y[n]-specimen series, A[n]-series frequency, multiplexing complementary variation amount with basic specimen series to obtain compensation amplitude and using formula G[n]=KG[n-1] to give out the amount as G[N]-compensation value and K-variation rate of the value; using formula Y[N]=G[n] as total output.

Description

Technical field [0001] The invention relates to a method for generating a linear digital frequency modulation signal, in particular to a method for generating a linear frequency modulation radar signal source by using a second-order infinite impulse response (Infinite Impulse Response, IIR) filter. It is especially suitable for implementation in Field Programmable GateAway (FPGA) and other devices with limited resources but high parallel processing speed. Background technique [0002] Linear Frequency Modulation (LFM), also known as Chirp, is the earliest and most mature pulse compression technology. This technology allows the radar system to transmit pulses with a relatively wide width and low peak power to obtain narrow pulses. , The resolution and detection performance of high peak power radar systems. The traditional method of generating chirp signals is divided into analog method and digital method. The analog method mainly uses linear sawtooth voltage controlled voltage con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/282G01S13/00H04L27/12
Inventor 文必洋王才军马志刚严卫东沈伟
Owner WUHAN UNIV
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