Range migration correction method for pulse Doppler (PD) radar in feeble signal detection process

A weak signal detection and walking correction technology, which is applied in the radar field, can solve problems such as distance walking exceeding, signal detection performance impact, discrete time sampling error not considered, etc., to achieve the effect of improving detection performance

Inactive Publication Date: 2013-04-03
XIDIAN UNIV
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Problems solved by technology

However, the extension of the coherent accumulation time also brings new problems: the range walk of the target during the long-term accumulation exceeds one range resolution unit
The existing Keystone transform algorithm does not take into account the discrete time sampling error, so it will inevitably have a certain impact on the signal detection performance

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  • Range migration correction method for pulse Doppler (PD) radar in feeble signal detection process
  • Range migration correction method for pulse Doppler (PD) radar in feeble signal detection process
  • Range migration correction method for pulse Doppler (PD) radar in feeble signal detection process

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Embodiment Construction

[0026] refer to figure 1 , the specific implementation steps of the present invention are as follows:

[0027] Step 1, the radar transmits a set of chirp signals whose bandwidth does not exceed 1% of the center frequency of the carrier.

[0028] The radar takes T as the pulse repetition period, and continuously transmits M chirp signals y(t) whose bandwidth does not exceed 1% of the carrier center frequency: y(t)=u(t-mT)exp[j2πf c (t-mT)], wherein, t is the full time; m is the slow time variable, m=0,1, L, M-1, M is the pulse number; exp represents the exponent power with e as the base; f c is the center frequency of the transmitted signal; u(t) is the chirp signal, T 0 is the pulse duration, k is the modulation frequency, assuming that the transmitted signal bandwidth is B, then there is rect is a rectangle function,

[0029] In step 2, the radar echo data is received by the radar receiver, and mixed into the baseband to obtain the baseband radar echo signal.

[003...

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Abstract

The invention discloses a range migration correction method for a pulse Doppler (PD) radar in a feeble signal detection process, which mainly solves the problems that the discrete time sampling error is not considered, and the detection performance is low in the prior art, and is realized by the steps as follows: transmitting a set of linear frequency-modulation pulse signals of which the bandwidth does not exceed 1 percent of a centre carrier frequency by the radar; carrying out mixing on echo data to obtain a base band radar echo signal; carrying out Fourier transformation on the base band radar echo signal in a fast time domain; carrying out digital pulse compression on a signal obtained by carrying out the Fourier transformation through the fast time domain in the fast time domain, and finding out a corresponding pulse signal when the discrete time error is minimum; by taking the pulse signal as an alignment reference, realizing Keystone transformation by using an SINC interpolation method, and carrying out Doppler fuzzy compensation; and carrying out the Fourier transformation in the fast time domain, and carrying out coherent accumulation to work out a range cell in which the target is located and a Doppler channel. Compared with similar methods, the range migration correction method for PD radar in the feeble signal detection process is capable of reducing the influenceof the discrete time sampling error to minimum, and is capable of improving the detection performance of a radar system.

Description

technical field [0001] The invention belongs to the technical field of radar, and specifically relates to a method for performing distance walking correction in a weak signal detection process of a PD radar. Background technique [0002] The detection of weak signals is a hot and difficult issue in the field of current radar technology. Using signal processing methods to improve radar detection of weak targets can be achieved by increasing the observation time and using coherent accumulation to increase the echo energy. However, the prolongation of coherent accumulation time also brings new problems: the range walk of the target during long-term accumulation exceeds one range resolution unit. The movement of the target envelope across the distance unit not only distorts the distance and velocity information of the target, but also makes the energy of the target scattered and cannot reach the detection threshold, resulting in a shortened radar range. [0003] In order to so...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/41
Inventor 赵永波王娟刘宏伟水鹏朗刘峥
Owner XIDIAN UNIV
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