Interface Board; Antenna - Mitel GPS Orion-S/-HD Receiver User Manual

Document Title:
User's Manual for the GPS Orion-S/-HD Receiver

2.2 Interface Board

The interface board provides auxiliary devices that are required for standalone operation of
the Orion receivers. It comprises
a switching regulator allowing operation from unregulated power supplies,
a rechargeable battery to maintain the non-volatile memory and real-time clock during
power down times and
two RS232 serial line drivers for communication with standard peripheral devices.
Key parameters of the interface board are summarized in Table 2.2.
Table 2.2 Physical and electrical parameters of GPS Orion interface board
Parameter
Dimension
Weight
Operating voltage
Efficiency of switching regulator
Total power consumption (I/F and main board) 2.4 W
Battery
I/O ports
The two serial ports support the ground, receive and transmit line using the standard pin as-
signment for Sub-D9 connectors (Table 2.2). Pins 7 and 8 are cross-connected since the
Orion receiver does not support a hardware handshake. Likewise the three pins 1, 4, and 6
are connected among each other.
Table 2.2 Pin assignment for RS232 Sub-D9 connectors (Port A and B)
Pin Description
1 DCD (Data Channel Received
Line Signal Detector)
2 RxD (Receive Data)
3 TxD (Transmit Data)
4 DTR (Data Terminal Ready)
5 GND (Signal Ground)
6 DSR (Data Set Ready)
7 RTS (Request to Send )
8 CTS (Clear to Send)
9 RI (Ring Indicator)

2.3 Antenna

The GPS Orion receiver is operated with an active antenna (or a passive antenna and exter-
nal preamplifier) having a minimum gain of 16 dB and a noise-figure of less than 4 dB More
specifically, the ANPC-131 antenna of M/A COM is recommended (cf. [4]), for terrestrial ap-
plications. It offers an LNA gain of +26 dB and a 1.5 dB noise-figure at the L1 frequency
(1575.42 MHz).
For space applications dedicated antenna designs with heat and vacuum resistant radomes
are generally required. For sounding rockets wrap around antennas, helix tip antennas or
blade antennas with separate preamplifiers are available on request. GPS antennas for
satellite applications are offered by e.g. Sensor Systems Inc.
Document No.
GTN-MAN-0110
DLR/GSOCNo part of this document shall be reproduced in any form or disclosed to third parties without prior authorization.
Value
95mm x 50mm x 20mm
70g
8–30V
85%
+3.6V NiCad, 110 mAh ([1])
2 x RS232 (±10V)
Sub-D9 connector (male)
Remarks
Connected with DTR and DSR (pins 4 , 6)
Connected with DCD and DSR (pins 1 , 6)
Connected with DCD and DTR (pins 1 , 4)
Connected with CTS (pin 8)
Connected with RTS (pin 7)
Not connected
7
Schematic
Issue 1.0
June 22, 2003