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Environment Simulation and Detection Performance Analysis for High Frequency Sky-surface Wave OTHR

Author: XuZuo
Tutor: DongYingNing
School: Harbin Institute of Technology
Course: Information and Communication Engineering
Keywords: High frequency sky-surface wave Ionosphere Sky Wave Surface Wave attenuation scattering characteristics of sea clutter SINR
CLC: TN958.93
Type: Master's thesis
Year: 2012
Downloads: 80
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Abstract


The HF Hybrid Sky-surface Wave System is a new mode of transmission whichdepends on the ionosphere propagation and ground wave diffraction propagation. Thisnew radar system is more vulnerable to external environmental factors, such as systemparameters, ionosphere, sea state, the ground wave propagation loss, ambient noise, seaclutter and so on. In order to verify the detection performance of the radar system, webuilt model and simulation based on environmental impact factors. The establishedsimulation model: the model of echo power, short-wave radio propagation model, seaclutter model and the environmental noise model.Echo power model is the high frequency earth radar equation which is the basis ofthe radar simulation. Radar equation can also focus on the reflection of radar detectionperformance, and mutual restraint factors. There are two kinds of the HF Hybrid Sky-surface Wave System equation in the system: one is field strength mode, the other ishigh-frequency power mode.For short-wave radio propagation model, we analysis the characteristics of short-wave sky wave ionosphere propagation, the IRI International Reference Ionospheremodel, several sky-wave propagation mode, as well as several specific frequency andthe calculation of the magnetic parameters, and calculation of the attenuation of theshortwave sky wave field strength and transmission in which the transmissionattenuation of the basic free-space transmission loss, ionosphere absorption loss, higherthan the MUF loss as well as ground reflection loss. We can use the program ofModified-GRWAVE to calculate the rough sea surface wave propagation attenuationwhich is based on the hybrid system of strong wave’s field calculations.Sea clutter model, first analysis of biostatic sea clutter situation, and the first-orderand second-order sea clutter numerical modeling and simulation analysis, analyzed anddiscussed the biostatic sea clutter generation mechanism. According to the HF HybridSky-surface Wave System works in the biostatic second-order scattering cross-sectionalarea theoretically derived and calculated high-frequency sky-surface second-order seaclutter scattering model.Ambient noise model, first we predict and analysis atmospheric radio noise, andcalculate the power of radio noise and make the simulation results which show thevariety of noise power by the operating frequency, area, different time of day and seasonfactors.Finally, for SNR-noise ratio model, the background of target detection is ambientnoise and sea clutter. Ambient noise dominant situation, using the radar equation, settingthe power mode setting signal to noise ratio value, we can simulate the detection rangeof the radar. We can also calculate the signal to noise ratio of the system under different detection range. Sea clutter dominated the situation, calculate the sea clutter power.Under this condition, the SIR is constant and not changes by the time and frequency.Analysis of simulation results of the application possibilities of the institutional radar.

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