Quectel L76, Проектирование аппаратного обеспечения

Страница: 14 / 60

GNSS Module Series
L76&L76-L_Hardware_Design 13 / 59
1.4. Block Diagram
The following figure shows a block diagram of the modules. The modules include a GNSS IC, an
additional LNA (only supported by L76-L and L76-L(L)), an additional SAW filter, a TCXO and a XTAL.
The LNA is less susceptible to in-band interference in challenged environment (i.e. with a cellular module
transmitting B13 at the same time). This ensures enhanced performance in an environment where
jamming may be encountered.
3
Open-sky, active high precision GNSS antenna, less than 1 km baseline length.
4
CEP, 50%, 24 hours static, -130 dBm, more than 6 SVs.
Tracking -165 dBm -167 dBm -167 dBm
TTFF
2
(with AGNSS)
Cold Start 15 s 15 s 15 s
Warm Start 5 s 5 s 5 s
Hot Start 1 s 2 s 2 s
TTFF
3
(without AGNSS)
Cold Start 35 s 32 s 32 s
Warm Start 30 s 30 s 30 s
Hot Start 1 s 2 s 2 s
Horizontal Position Accuracy
4
2.5 m
Update Rate 1 Hz (max. 10 Hz)
Accuracy of 1PPS Signal
Typical accuracy: 100 ns
Time pulse width: 100 ms
Velocity Accuracy
2
Without aid: 0.1 m/s
Acceleration Accuracy
2
Without aid: 0.1 m/s²
Dynamic Performance
2
Maximum Altitude: 10000 m
Maximum Velocity: 515 m/s
Acceleration: 4g