# Aerospace navigation systems by Alexander V. Nebylov, Joseph Watson

By Alexander V. Nebylov, Joseph Watson

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2. 3) 3. Setting up at will the sensitivity levels εϕ and εh in order to define the convergence condition of the iterative process and initializing the algorithm with the following starting values: fs = p a , ds = , hs = 0. 2 1 - e2 4. Computing the new values related to the latitude æ zp ds + hs fn = arctan ç ç x 2 + y 2 ds (1 - e2 ) + hs p è p ö a ÷, d = . 4) 33 Satellite Navigation Systems 5. 5) í z ï p p p 2 ïhn = sin f - d n 1 - e , if fn > 4 or fn < - 4 î n ( ) 6. Evaluating the convergence of the obtained results if fn - fs < e f and hn - hs < e h then f = fn , h = hn , and the algorithm stops here.

1) modulation compatible and complementary to the L1 Galileo signal ⚬⚬ Onboard integrity monitoring capabilities The OCS has responsibilities for maintaining the satellites and ensuring their proper functioning. This includes keeping the satellites in their proper orbital positions and in their correct attitudes, monitoring the health and status subsystems, and maintaining the proper functioning of the navigation payload. In particular, the OCS has to update each satellite clock in order to exactly model its present drift and to synchronize it to the GPS time.

4, let a and b be the major semiaxis and the minor semiaxis of the elliptical shape, respectively. Then, its eccentricity is defined as e = 1- b2 a2 It can be noted that for each point P in the tridimensional space, both a set of ( xp , yp , zp ) ECEF coordinates and a set of ϕ, λ, and h WGS84 geodetic coordinates can be equivalently assumed. In particular ϕ, λ, and h represent the latitude, longitude, and altitude, respectively. 4, where ΠT is the local tangent plane to the WGS84 reference ellipsoid at the point S, which represents the orthogonal projection of P to the ellipsoidal surface, while n is the geodetic normal to the local tangent plane ΠT.