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A method and system for generating broadband chaotic radar signals with carrier frequency random hopping

A technology of radar signal and generation method, which is applied in the direction of radio wave measurement system, instrument, etc., can solve the problems of step frequency chirp signal spoofing interference and suppressing interference, step frequency noise signal suppressing interference, etc.

Inactive Publication Date: 2017-05-17
NAT SPACE SCI CENT CAS
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Problems solved by technology

However, the enemy jammer can easily detect the linearly changing carrier frequency and implement interference. The step frequency Chirp signal is vulnerable to deception and suppression interference, while the step frequency noise signal is susceptible to suppression interference

Method used

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  • A method and system for generating broadband chaotic radar signals with carrier frequency random hopping
  • A method and system for generating broadband chaotic radar signals with carrier frequency random hopping
  • A method and system for generating broadband chaotic radar signals with carrier frequency random hopping

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specific Embodiment

[0092] The broadband chaotic radar signal of carrier frequency random hopping that the present invention obtains:

[0093] Such as figure 1 As shown, the present invention provides a broadband chaotic radar signal with carrier frequency random hopping.

[0094] The chaotic radar signal with random carrier frequency hopping is composed of a series of sub-pulse signals with random carrier frequency hopping, and each sub-pulse uses a narrowband chaotic signal as a baseband signal. Its expression formula is:

[0095]

[0096]

[0097] t n =nT r ,n=0,1,...,N-1;

[0098] Among them, f n is the carrier frequency of the nth sub-pulse, and f n = f 0 +c n Δf; f 0 is the initial carrier frequency, c n ∈{0,1,…,N-1} is a random carrier frequency hopping code. N is the number of sub-pulses. is the baseband chaotic signal of the nth sub-pulse, and each sub-pulse is independent of each other. t n is the moment of the nth sub-pulse, T r is the interval between sub-pulses,...

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Abstract

The invention relates to a method and system for generating broadband chaos radar signals with carrier frequency jumping randomly. The method comprises the steps of (101) inputting baseband signals, (102) generating combinatorial mapping sequences, then generating carrier frequency hopping codes through the combinatorial mapping sequences, and (103) selecting carrier frequency signals according to the generated carrier frequency hopping codes, carrying out up conversion on the baseband signals to obtain the broadband chaos radar signals. The broadband chaos radar signals with the carrier frequency jumping randomly is composed of a string of sub pulse signals with carrier frequency jumping randomly, and each sub pulse adopts narrow-band chaos signals as baseband signals. The radar signals generated by the method and system have quite large bandwidth, and therefore quite high range resolution can be obtained. Meanwhile, due to the fact that the carrier frequency can jump randomly, the chaos signals are adopted as the baseband signals, the radar signals have quite excellent low detection probability characteristics, low interception probability characteristics and anti-electronic jamming capacity.

Description

technical field [0001] The invention relates to the field of broadband chaotic radar signal design, in particular to a method and system for generating broadband chaotic radar signals with carrier frequency random hopping. Background technique [0002] Noise radars use noise signals or pseudo-noise signals as transmit waveforms. At present, noise radar has been extensively studied in many fields, including battlefield surveillance, target tracking, vehicle collision avoidance, through-wall imaging radar, synthetic aperture radar and inverse synthetic aperture radar. [0003] In noise radar, noise signal source is an important key technology. Compared with ordinary thermal noise signals, chaotic signals are easier to generate and control, and the price is low. A chaotic signal is a pseudorandom signal generated by a deterministic system. The characteristics of the chaotic signal are: it is very sensitive to the initial value, and a small change of the initial value will ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/36G01S7/28
CPCG01S7/2813G01S7/36
Inventor 杨启伦张云华顾翔
Owner NAT SPACE SCI CENT CAS
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