CN108111452B - Method for estimating arrival time of broadband linear frequency modulation pulse signal - Google Patents
Method for estimating arrival time of broadband linear frequency modulation pulse signal Download PDFInfo
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- CN108111452B CN108111452B CN201611043989.XA CN201611043989A CN108111452B CN 108111452 B CN108111452 B CN 108111452B CN 201611043989 A CN201611043989 A CN 201611043989A CN 108111452 B CN108111452 B CN 108111452B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
- H04L27/103—Chirp modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03828—Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
- H04L27/14—Demodulator circuits; Receiver circuits
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Abstract
The invention discloses a method for estimating arrival time of a broadband linear frequency modulation pulse signal, which is realized by a signal sampling module, a baseband signal generating module and an arrival time estimating module. The signal sampling module samples the broadband linear frequency modulation pulse signal to form a sampling sequence; the baseband signal generating module performs complex multiplication on the sampling sequence to generate a baseband signal; the arrival time estimation module carries out discrete wavelet transformation on the baseband signal, and carries out modular extraction on the transformation result to estimate the arrival time. The invention solves the problem that the estimation performance of the common signal arrival time estimation method is poorer at the time of high signal-to-noise ratio.
Description
Technical Field
The invention relates to a signal arrival time estimation method, in particular to a broadband chirp signal arrival time estimation method.
Background
When the radar scene is matched with the seeker end guidance, the arrival time parameter of the broadband linear frequency modulation pulse signal needs to be estimated for subsequent signal processing. A chirp-modulated (LFM) pulse signal means that the frequency of the signal is swept linearly up or down within the pulse width. The common signal arrival time estimation method is a signal arrival time estimation method based on reverse order correlation accumulation, namely, the start time and the stop time of a signal are roughly estimated, and the carrier frequency of the signal is estimated according to a signal segment defined by the rough estimation so as to convert the signal to a baseband; and then, performing reverse order correlation accumulation on the baseband signals, so that the accumulated signals reach the maximum output signal-to-noise ratio at the arrival time point and an inflection point appears. For the convenience of detection, the detection inflection point is converted into peak detection through certain processing, and the detected peak position is used as a fine estimation of the arrival time. The reverse order correlation accumulation operation used in the method belongs to linear operation, a certain signal-to-noise ratio gain is obtained, but the estimation performance is poorer at high signal-to-noise ratio.
Disclosure of Invention
The invention aims to provide a method for estimating the arrival time of a broadband linear frequency modulation pulse signal, which solves the problem that the estimation performance of the conventional signal arrival time estimation method is poor at high signal-to-noise ratio.
A method for estimating the arrival time of a broadband chirp signal comprises the following specific steps:
first step, building a signal arrival time estimation platform
A signal time-of-arrival estimation platform comprising: the device comprises a signal sampling module, a baseband signal generating module and a time of arrival estimation module. The signal sampling module has the functions of: sampling the broadband linear frequency modulation pulse signal to form a sampling sequence; the baseband signal generating module has the functions of: carrying out complex multiplication on the sampling sequence to generate a baseband signal; the arrival time estimation module has the functions of: discrete wavelet transform is carried out on the baseband signals, a modulus is taken for a transform result, and arrival time is estimated.
The second step sampling module samples the broadband linear frequency modulation pulse signal
The sampling module samples a broadband linear frequency modulation pulse signal x (t) within a time range of pulse width to form a sampling sequence x (n), wherein the sampling frequency is fs，TsFor sampling time intervals, Ts＝1/fs(ii) a t is a time domain time parameter, N is a time domain point index value, N is 0,1sτ; the center frequency of the broadband chirp signal x (t) is f0The bandwidth is B, the pulse width is τ, and the chirp rate μ is B/τ.
Thirdly, the baseband signal generating module performs complex multiplication on the sampling sequence to generate a baseband signal
The baseband signal generation module performs complex multiplication on the sampling sequence x (n):
generating a baseband signal z (n), where j represents
In the form of a complex representation
The fourth step is that the arrival time estimation module carries out discrete wavelet transformation on the baseband signal to estimate the arrival time
The arrival time estimation module performs discrete wavelet transform on the baseband signal z (n): Ψ (n) ═ WT { z (n) }, and transforming the baseband signal z (n) from the time domain to the wavelet domain to obtain a transformation result Ψ (n), wherein WT { · represents a discrete wavelet transform; modulo the transform result Ψ (n): a (n) ═ Ψ (n) |, yielding a modulus a (n), where | · | represents a complex modulo operation; detecting the first extreme point of the modulus a (n), the corresponding position is l0I.e. an estimate of the time of arrival.
Thus, the estimation of the arrival time of the broadband chirp signal is realized.
The method solves the problem that the estimation performance of the common signal arrival time estimation method is poor at the time of high signal-to-noise ratio, and the method is considered to be effective and feasible through various tests. The method is successfully applied to a radar scene matching seeker of a conventional medium-long distance ballistic missile, and in a test, the radar scene matching seeker can estimate the arrival time of a broadband chirp signal at a high signal-to-noise ratio, and the estimation performance meets the use requirement.
Detailed Description
A method for estimating the arrival time of a broadband chirp signal comprises the following specific steps:
first step, building a signal arrival time estimation platform
A signal time-of-arrival estimation platform comprising: the device comprises a signal sampling module, a baseband signal generating module and a time of arrival estimation module. The signal sampling module has the functions of: sampling the broadband linear frequency modulation pulse signal to form a sampling sequence; the baseband signal generating module has the functions of: carrying out complex multiplication on the sampling sequence to generate a baseband signal; the arrival time estimation module has the functions of: discrete wavelet transform is carried out on the baseband signals, a modulus is taken for a transform result, and arrival time is estimated.
The second step sampling module samples the broadband linear frequency modulation pulse signal
The sampling module samples the broadband linear frequency modulation pulse signal x (t) within a time range of pulse width to form a sampling sequence x (n)Sampling frequency of fs，TsFor sampling time intervals, Ts＝1/fs(ii) a t is a time domain time parameter, N is a time domain point index value, N is 0,1sτ; the center frequency of the broadband chirp signal x (t) is f0The bandwidth is B, the pulse width is τ, and the chirp rate μ is B/τ.
Thirdly, the baseband signal generating module performs complex multiplication on the sampling sequence to generate a baseband signal
The baseband signal generation module performs complex multiplication on the sampling sequence x (n):
generating a baseband signal z (n), where j represents
In the form of a complex representation
The fourth step is that the arrival time estimation module carries out discrete wavelet transformation on the baseband signal to estimate the arrival time
The arrival time estimation module performs discrete wavelet transform on the baseband signal z (n): Ψ (n) ═ WT { z (n) }, and transforming the baseband signal z (n) from the time domain to the wavelet domain to obtain a transformation result Ψ (n), wherein WT { · represents a discrete wavelet transform; modulo the transform result Ψ (n): a (n) ═ Ψ (n) |, yielding a modulus a (n), where | · | represents a complex modulo operation; detecting the first extreme point of the modulus a (n), the corresponding position is l0I.e. an estimate of the time of arrival.
Thus, the estimation of the arrival time of the broadband chirp signal is realized.
Claims (1)
1. A method for estimating the arrival time of a broadband linear frequency modulation pulse signal is characterized by comprising the following specific steps:
first step, building a signal arrival time estimation platform
A signal time-of-arrival estimation platform comprising: the device comprises a signal sampling module, a baseband signal generating module and an arrival time estimating module; the signal sampling module has the functions of: sampling the broadband linear frequency modulation pulse signal to form a sampling sequence; the baseband signal generating module has the functions of: carrying out complex multiplication on the sampling sequence to generate a baseband signal; the arrival time estimation module has the functions of: carrying out discrete wavelet transform on the baseband signal, performing modulus extraction on a transform result, and estimating arrival time;
the second step signal sampling module samples the broadband linear frequency modulation pulse signal
The signal sampling module samples a broadband linear frequency modulation pulse signal x (t) within a time range of pulse width to form a sampling sequence x (n), wherein the sampling frequency is fs，TsFor sampling time intervals, Ts＝1/fs(ii) a t is a time domain time parameter, N is a time domain point index value, N is 0,1sτ; the center frequency of the broadband chirp signal x (t) is f0The bandwidth is B, the pulse width is tau, and the frequency modulation slope mu is B/tau;
thirdly, the baseband signal generating module performs complex multiplication on the sampling sequence to generate a baseband signal
The baseband signal generation module performs complex multiplication on the sampling sequence x (n):
generating a baseband signal z (n), where j represents
Is complex number representation form, representing cos (-2 pi f)0nTs-πμn2Ts 2)+jsin(-2πf0nTs-πμn2Ts 2)；
The fourth step is that the arrival time estimation module carries out discrete wavelet transformation on the baseband signal to estimate the arrival time
The arrival time estimation module performs discrete wavelet transform on the baseband signal z (n): Ψ (n) ═ WT { z (n) }, and transforming the baseband signal z (n) from the time domain to the wavelet domain to obtain a transformation result Ψ (n), wherein WT { · represents a discrete wavelet transform; modulo the transform result Ψ (n): a (n) ═ Ψ (n) |, yielding a modulus a (n), where | · | represents a complex modulo operation; detecting the first extreme point of the modulus a (n), the corresponding position is l0Namely, the estimated value of the arrival time;
thus, the estimation of the arrival time of the broadband chirp signal is realized.
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| CN104977568A (en) * | 2014-04-10 | 2015-10-14 | 罗伯特·博世有限公司 | Method For Determining A Time Multiplexing Sequence For A Mimo Radar |
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| CN104977568A (en) * | 2014-04-10 | 2015-10-14 | 罗伯特·博世有限公司 | Method For Determining A Time Multiplexing Sequence For A Mimo Radar |
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| 《Modulation adaptation according to radio channel pulse response》;Majer, N.;《IEEE》;20110222;全文 * |
| 《相位调制信号识别与参数估计研究》;王昀;《中国优秀硕士学位论文全文数据库信息科技集》;20140115;全文 * |
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