A Radar Echo Simulation Method Based on Time Domain Upsampling

Abstract

A radar echo simulation method based on time-domain upsampling, involving the field of microwave remote sensing; including the following steps: Step 1, setting the maximum quantization error ΔR max ; Calculate the frequency after upsampling Step 2, calculate the upsampling multiple L; Step 3, carry out discretization processing to the radar emission signal x(t) to obtain x[n]; Step 4, carry out N-point discrete Fourier transform to x[n] , get the transmitted signal spectrum X(f); step five, calculate the echo time delay τ of the i-th scattering point of the radar irradiated target i and echo intensity a i ; Step six, calculate the discrete time domain impulse response h i [m] and discrete time-domain impulse response h[m]; step seven, calculate the target frequency domain response H (f); step eight, calculate the echo signal spectrum Y (f); step nine, to the echo signal spectrum Y (f) Do N-point discrete inverse Fourier transform to obtain time-domain echo signals; the present invention has high precision, simple implementation, high reliability, greatly reduces the amount of computation, improves simulation efficiency, and is suitable for ranging radar echoes simulation.

Description

technical field [0001] The invention relates to the field of microwave remote sensing, in particular to a radar echo simulation method based on time-domain upsampling. Background technique [0002] Radar echo semi-physical simulation is an effective means to verify data processing algorithms, and provides an important reference for radar system design and optimization. The high-precision simulated echo method can realistically simulate a specific physical scene, generate echo data that is more consistent with the measured signal, and replace field tests to a certain extent. The accuracy of the simulated echo and the measured echo directly affects the test of the processing algorithm and the evaluation of the system performance. [0003] For a specific physical scene, the scattering situation is more complicated, and the radar transmitted signal may also produce certain distortion. The echo signal has no analytical solution, so all the scattering points in the entire scene n...

AI Technical Summary

Problems solved by technology

The time domain algorithm calculates the time delay and scattering intensity of the simulated target, that is, the time domain impulse response of the target, which can reflect the echo generation process from the time domain. The physical concept is clear, the algorithm has high precision, and motion errors can also be accurately introduced. The disadvantage is that the amount of calculation is huge

The two-dimensional frequency-domain algorithm starts with the distribution of the scattering coefficient of the target, and derives the two-dimensional spectrum of the system transfer function. The time-domain convolution is replaced by two-dimensional FFT, and the amount of calculation is greatly reduced. However, this method uses frequency domain interpolation, etc. Approximation, the accuracy is lower than the time domain method, and it is difficult to introduce motion errors

This method has a large amount of calculation and a large amount of storage in the whole simulation process.

Images