Installation Manual

THALES COMMUNICATIONS
OIM
AHV1600-SYSTEM
Page 3
July 16/09
in the beat signal spectrum provides an accurate height measurement, and a T
ST
for the feedback loop to
keep fbo in its defined frequency range from one measurement to the other. Hence the relationship :
Ho K fbo . where
F
Tc
K
ST


.2
.
3. BUILT IN TEST FUNCTION
The AHV1600 Transceiver implements an operational built-in test (BIT) in the following steps:
A. POWER-UP BUILT IN TEST (PBIT)
The AHV1600 Transceiver is capable of carrying out a performance test upon completion of the ini-
tialization sequence after power up to confirm the serviceability of the assembly. This test is per-
formed in 3 s.
B. INITIATED BUILT IN TEST (IBIT)
The AHV1600 Transceiver is capable of carrying out a performance test to confirm the serviceabil-
ity of the Transceiver upon receipt of the discrete input signal “FCT_TST“. This test is performed in
3s.
C. CONTINUOUS BUILT IN TEST (CBIT)
The AHV1600 Transceiver is carrying out a continuous test of performance of the system as a
background task. Continuous BIT provides coverage to the minimum extent possible without inter-
fering with the normal Transceiver operation.
The BIT is controlled by the software embedded by the equipment.
4. AIRCRAFT INTERFACE
The AHV1600 transceiver interfaces with the following equipment :
 Airborne navigation computer,
 Airborne power supply,

Two antennae.
The figure 1 shows a block diagram of the AHV1600 radar altimeter system: