A Parameter Estimation Method for Time-Frequency Aliasing and Frequency Hopping Signals
A technique for frequency hopping signal and parameter estimation, which is applied in the field of signal processing to achieve the effects of improving sparsity, good robustness, and achieving complete recovery and high-precision parameter estimation.
Active Publication Date: 2022-03-25
UNIT 63892 OF PLA
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[0008] Aiming at the problem of parameter estimation of single-channel time-frequency aliasing and frequency-hopping signals in complex electromagnetic environments in broadband reception, the purpose of the present invention is to provide a parameter of time-frequency aliasing and frequency-hopping signals based on sparse linear regression and quadratic envelope optimization Estimation method, for the scenario where each source signal is aliased in the time and frequency domain, it performs effective interference feature removal and high-precision parameter estimation on the single-channel frequency hopping signal, effectively reducing the sparsity of the input aliasing signal Limits, and significantly improve the parameter estimation accuracy of frequency hopping signals under low SNR, and have greatly improved in terms of application range, parameter estimation accuracy and robustness under low SNR
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[0119] The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.
[0120] like Figures 1 to 16 As shown, a method for estimating parameters of a time-frequency aliased frequency hopping signal includes the following specific steps:
[0121] S1. Convert the time-frequency aliased signal f(t) received by a single channel to the time-frequency domain using the short-time Fourier transform STFT, and the obtained time-frequency domain signal coefficient is expressed as F(t, f); the process is as follows :
[0122]
[0123] where f(t) represents the observed signal, A∈R 1×n is a one-dimensional observation matrix, s(t) represents the source signal, and v(t) represents the additive noise; here, in the non-cooperative asynchronous reception scenario, the source signals are independent between the transmitters;
[0124] In the observation time [0, T], set the frequency hopping signal s ...
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The invention discloses a method for estimating parameters of a time-frequency aliasing frequency hopping signal, the steps of which are: transforming the time-frequency aliasing signal received by a single channel into the time-frequency domain by short-time Fourier transform to obtain the time-frequency domain signal; use the matrix optimization algorithm based on sparse linear regression to remove background noise and signal distortion characteristics of the time-frequency domain signal; use the parameter estimation algorithm based on quadratic envelope optimization to remove part of the interference signal characteristics and abnormalities from the time-frequency domain signal Point processing, extracting the average time-frequency ridge line of the optimized time-frequency domain signal for smoothing; performing inflection point detection on the average time-frequency ridge line, and then performing time-frequency domain mapping on the detected inflection point to complete the hopping period estimation of the frequency hopping signal ; On the basis of the frequency hopping cycle estimation, the frequency point estimation of the frequency hopping signal is completed by the optimization method based on Hough transform. The present invention can realize the complete recovery of the frequency hopping signal and the high-precision estimation of the parameters aiming at the scene where various source signals are aliased in the time and frequency domains.
Description
technical field [0001] The invention belongs to the technical field of signal processing, and in particular relates to a parameter estimation method of a time-frequency aliasing frequency hopping signal. Background technique [0002] Frequency hopping spread spectrum signal is widely used in military and commercial communication fields due to its advantages of low interception probability, good anti-jamming performance, good secrecy, safety and reliability, and it also brings serious challenges to electronic reconnaissance. In electronic reconnaissance technology, signal detection and parameter estimation are usually required to complete signal reconnaissance. Correctly estimating the signal parameters of frequency hopping is one of the important components to complete the signal de-hopping. Therefore, it is of great significance to study the detection and parameter estimation of frequency hopping signals. [0003] Parameter estimation of frequency hopping signals in differ...
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IPC IPC(8): H04B1/713H04B1/715H04L25/02
CPCH04B1/713H04B1/715H04L25/0202H04L25/024
Inventor 刘志鹏汪连栋冯蕴天刘晓光许雄陈翔
Owner UNIT 63892 OF PLA