Question

1. (5 pts.) What is the length of a single cycle, or wave, of the LI signal? 2. (5 pts.) Which of the following is not contained in in the Navigation Code? (a) Ionospheric data (b) Receiver clock correction (c) Doppler constant (d) Ephemeris 3. (5 pts.) That part of the Navigation Code which allows derivation of the satellite's position and velocity is called the 4. (5 pts.) Solution of four unknowns is required to position a GPS receiver. What are the letters which denote each unknown? 5. (5 pts.) Dual frequency receivers have an advantage over single frequency receivers in that they have the capability to: (a) reduce ionospheric bias (b) increase signal strength. (c) eliminate integer ambiguity (d) reduce satellite clock drift. 6. (5 pts.) Between-the-receivers differencing is used to cancel (a) satellite clock bias (b) multipath (c) receiver clock bias (d) orbital bias

Answer 1

1. The L1 signal used in GPS are of 1575.42 MHz. Hence the time taken for one complete cycle is the reciprocal of this frequency which gives, the time of one complete cycle as,

T= 1575.42 × 106 6.34 × 10-10s

Also the wavelength of the signal is,

3 × 108 1575.42 × 106-0.19m

Therefore the length of one cycle is 0.19 m.