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3.10 Dynamic constraints
The Jupiter 20 receiver is programmed to deliberately lose track if any of the following limits are
exceeded:
Velocity:
500 m/s max
Acceleration: 4 G (39.2 m/s
Vehicle jerk: 5 m/s
3
Altitude:
18 000 m max (referenced to MSL)
3.11 Position and velocity accuracy
The position and velocity accuracy of the Jupiter 20 are shown in Table 3‑4, assuming full
accuracy C/A code (Clear/Acquisition). These values are the same in normal operation and
when TricklePower is active.
horizontal (2 dRMS)
velocity 2D (2 sigma)*
*at a velocity greater than km/h
4.0 Electrical requirements
4.1 Power supply
4.1.1 Primary power
The Jupiter 20 GPS receiver is designed to operate from a single supply voltage, meeting the
requirements shown in Table 4‑1.
Parameter
input voltage
current (typ) at full power (3.3 V)
current (max)
current (typ) at 20% TricklePower
battery backup voltage
battery backup current
maximum rise time
ripple
Table 4-1: Operating power for the Jupiter 20
4.1.2 Low supply voltage detector
The module will enter a reset mode if the main supply drops below 2.8 V.
4.1.3 VCC_RF power supply
The VCC_RF (pad 20) provides a regulated 2.8 V power source. The specifications for this
supply are as follows:
voltage: 2.8 V ± 2%
current max: 25 mA for J20/J20S; 5 mA for J20D
LA000507G © 2006 Navman New Zealand. All rights reserved. Proprietary information and specifications subject to change without notice.
2
) max
max
Parameter
J20/J20D
horizontal CEP
vertical VEP
0.1 m/s
Table 3-4: Position and velocity accuracy
J20
2.9 to 3.6 VDC
75 mA
100 mA
TM
35 mA
not to exceed 50 mV peak to peak
J20S
2.1 m
2.2 m
5.2 m
5.5 m
2.5 m
2.5 m
0.15 m/s
J20S
2.9 to 3.6 VDC
2.9 to 3.6 VDC
85 mA
100 mA
60 mA
2.4 V to 3.6 V
<10 µA typ at 25°C
unlimited
J20D
80 mA
100 mA
35 mA
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