VISIO GPS

The program calculates the orbital characteristics of GPS. Almanac YUMA

ORBITAL CHARACTERISTICS OF GPS

%Copyright: 2010 - 2022

%Questions and comments should be directed to Valeriy Konin at:

%Valeriy Konin, [e-mail]

%%Comment 1

%Name of the m-file:Visio_GPS.m

%The program calculates the orbital characteristics of GPS,

%Input data:

%files of almanac in Yuma format

%reference data "d2", d2='month/day/year'; h=hour; min=minute; s=seconds;

%receiver position coordinates -lat (latitude in radians),lon (longitude in radians,

%hr (height in meters);

%(step, seconds), step with which parameters are calculated

%number of points (L), in which the orbit parameters will be calculated

%L=12*3600/step, L reads so: number of hours (for example,12)

%number of seconds in one hour (3600) divided on one step (step)

%%Comment 2 Permanent:

%Earth rotation speed. Switching this setting changes

% image of the orbit on the graph

%%Comment 3 radii of the earth's ellipsoid

%%Comment 4 constants

%%Comment 5 Setting colors for graphics

%% Comment 6 setting the time on the title inscription of the graph,

%determined by parameters d2'; h; min; s and j or L;

%Comment 7 Input data

%Comment 8 function displays the Earth on charts

%Comment 9 coordinates of the point from which the satellites are observed

% Comment 10 Coefficients and transformation matrix

% Comment 11 Mask angle (degree)

%Comment 12 time step in seconds (300=5 minutes); step

% can change

%%Comment 13 number of samples

%%Comment 14 number of samples set

% before L to display a table of angles of visibility and azimuth

% %Comment 15 Zeroing arrays

%%Comment 16 Reading an almanac

%%Comment 17 navigation satellite number

%%Comment 18 Coordinate transformation

%%Comment 19 center of mass of the Еarth

%%Comment 20 Start of the countdown of the current time

%%Comment 21 Calculation of satellite orbits

%%Comment 22 if the almanac does not take into account 1024 or 2048 weeks

%%Comment 23

%%Reference to the almanac - the number in brackets indicates the ordinal number of the almanac parameter in the format YUMA

%%Comment 24 solution of the Kepler equation

%%Comment 25 Ranges to satellites

%%Comment 26 Translation to geographic system, if required

%Comment 27 satellite view angle calculation

%%Comment 29 viewing angle calculation

%%Comment 30 satellite visibility angles

%%Comment 31 calculation of satellite azimuth angles

%%Comment 31 satellite azimuth angles in degrees

%%Comment 32 satellite visibility angles in degrees

%%Comment 33 TIME RECALCULATION

%%Comment 34 Data for building orbits

%%Comment 35 Graphics

%%Comment 36 Sizes of axes on the schedule

%%Comment 37 Visible satellites

%%Comment 38 Local Time Number of the countdown

%%Comment 39 When calculating one implementation, block or set n

%%Comment 40 quantity of the satellites

%%Comment 41 Accuracy to calculate the position

%%Comment 42 measured the pseudorange

%%Comment 43 Pseudorange Measurement and Coefficient for Artificially Inferred Pseudorange Error

%%Comment 44 Estimated pseudoranges

%%Comment 45 Calculation of Position and Geometric Factor

%%Comment 46 Position %%Comment 47 geometric factors.