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please stay on subject other wise you will not get rated good at all thank you There are two methods for determine the range from SC to the REC in GPS; codes (C/A and P) and waves (L1 and L2). Discuss two elements of GPS signals as they relate to each method. Choose from the list of elements shown below. Elements *choose two to answer the above questions* please note which element u are refering too thank you -1. determination of time -2. atmospheric errors -3. correlation of signal at REC -4. what is actually measured at the REC -5. AODC effects on GPS signal -6. Accuracy also please specify which two elements you are choosing each one should be about one paragraph

Explanation / Answer

-5. AODC effects on GPS signal The SVs transmit two microwave carrier signals. The L1 frequency (1575.42 MHz) carries the navigation message and the SPS code signals. The L2 frequency (1227.60 MHz) is used to measure the ionospheric delay by PPS equipped receivers. Three binary codes shift the L1 and/or L2 carrier phase. The C/A Code (Coarse Acquisition) modulates the L1 carrier phase. The C/A code is a repeating 1 MHz Pseudo Random Noise (PRN) Code. This noise-like code modulates the L1 carrier signal, "spreading" the spectrum over a 1 MHz bandwidth. The C/A code repeats every 1023 bits (one millisecond). There is a different C/A code PRN for each SV. GPS satellites are often identified by their PRN number, the unique identifier for each pseudo-random-noise code. The C/A code that modulates the L1 carrier is the basis for the civil SPS. The P-Code (Precise) modulates both the L1 and L2 carrier phases. The P-Code is a very long (seven days) 10 MHz PRN code. In the Anti-Spoofing (AS) mode of operation, the P-Code is encrypted into the Y-Code. The encrypted Y-Code requires a classified AS Module for each receiver channel and is for use only by authorized users with cryptographic keys. The P (Y)-Code is the basis for the PPS. The Navigation Message also modulates the L1-C/A code signal. The Navigation Message is a 50 Hz signal consisting of data bits that describe the GPS satellite orbits, clock corrections, and other system parameters

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