37 lines
2.2 KiB
Matlab
37 lines
2.2 KiB
Matlab
classdef rfSensor
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properties (SetAccess = private, GetAccess = public)
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% Physical parameters
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c = 3e8; % Speed of light (m/s)
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k_B = 1.38e-23 % Boltzmann constant (W/Hz/K) for thermal noise model
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T_0 = 300; % Ambient temperature (Kelvin) for thermal noise model
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lossExponent = NaN; % Path loss exponent (2 for free space, up to 6 for the lossiest environments)
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% Sensor parameters
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P_TX = NaN; % Transmit power (Watts)
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BW = NaN; % Bandwidth (Hz)
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f_c = NaN; % Center frequency (Hz)
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G_RX_dBi = NaN; % Receiver antenna gain
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tilt = NaN; % Antenna boresight tilt (deg): 0=nadir, 90=horizon
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azimuth = NaN; % Antenna boresight azimuth (deg): 0=+y, 90=+x, 180=-y, 270=-x
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beamwidthExponent = NaN; % Antenna beamwidth exponent for cosine radiation pattern, larger exponent -> narrower beam
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% Values computed at initialization
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P_TX_dBm = NaN; % Transmit power (dBm)
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N = NaN; % Thermal noise
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% Cached state (per timestep)
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rssCache (:,1) double = double.empty(0,1); % linear-scale RSS to last target grid
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end
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methods (Access = public)
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[obj] = initialize(obj, txPower, bandwidth, centerFreq, rxGain, beamwidthExponent, tilt, azimuth); % initialize sensor, define parameters
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[SINR, SNR, obj, otherSensors] = sensorPerformance(obj, agentPos, targetPos, otherSensorsPos, otherSensors); % determine sensor performance for a given single sensor and target geometry
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[d, t, a] = computePointToPoints(obj, agentPos, targetPos);
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[value] = halfAngle(obj); % tilt angle (deg) at which sensor performance is halved
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[f] = plotParameters(obj); % debug, plot sensor response as a function of distance and tilt angle
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[f] = plotPerformance(obj, altitude, otherSensorsPos, otherSensors); % debug, plot SNR or SINR ground heatmap for a given geometry
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obj = clearRssCache(obj);
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end
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methods (Access = private)
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x = RSS(obj, d, t, a); % Received signal strength (function of distance and tilt angle)
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G_TX_dB = transmitterGain(obj, t, a); % TODO Antenna gain for a given TX/RX pair
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L_FSPL_dB = pathLoss(obj, d); % Free space path loss for a given TX/RX pair
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end
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end |