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Scientech Technologies Pvt. Ltd.
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Block I, II, IIR, IIF satellites :
The various generations of GPS satellites: Block I were prototype satellites that began
being launched in 1978; 24 Block II satellites made up the fully operational GPS
constellation declared in 1995; Block IIR are replenishment satellites; and Block IIF
refers to the follow-on generation.
C/A code :
The coarse/acquisition or clear/acquisition code modulated onto the GPS L1 signal.
This code is a sequence of 1023 pseudorandom binary biphase modulations on the
GPS carrier at a chipping rate of 1.023 MHz, thus having a code repetition period of 1
millisecond. The code was selected to provide good acquisition properties. Also
known as the "civilian code."
Carrier :
A radio wave having at least one characteristic, such as frequency, amplitude or
phase, that may be varied from a known reference value by modulation.
Carrier-aided tracking :
A signal processing strategy that uses the GPS carrier signal to achieve an exact lock
on the pseudorandom code.
Carrier frequency :
The frequency of the unmodulated fundamental output of a radio transmitter. The
GPS L1 carrier frequency is 1575.42 MHz.
Carrier phase :
GPS measurements based on the L1 or L2 carrier signal.
CDMA :
see code division multiple access
Channel :
A channel of a GPS receiver consists of the circuitry necessary to receive the signal
from a single GPS satellite.
Chip :
The length of time to transmit either a "0" or a "1" in a binary pulse code. Also, an
integrated circuit.
Chip rate :
Number of chips per second. For example, C/A code = 1.023 MHz.
Circular error probable (CEP) :
In a circular normal distribution, the radius of the circle containing 50 percent of the
individual measurements being made, or the radius of the circle within which there is
a 50 percent probability of being located.
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