Simple Arpa Block Diagram - Furuno FR-2155 Service Manual

2.18 Simple ARPA block diagram

Gyrocompass
(25 msec AD format)
Interface for detecting amount
of position change
QV echo
1. Outputs acquisition and position data to ARPA
Board.
2. Processes markers for display on CRT.
3. Displays and memorizes ARPA track.
4. Checks for presence or absence of ARP
Board when power is applied.
Speed Log
(Contact signal, Nav data,
Manual speed input)
1. Conversion of echo position coordinate (R/
2. Edge detection of estimated position of tracking and acquiring
echoes.
3. Error detection of input signal (TRIG, HD, BP, VIDEO, Log, Gyro.)
4. Echo detection within guard zone and auto ACQ area.
Echo detection window
1. Target data of manually acquired target and automatic acquisition of target
inside guard ring.
2. Automatic tracking of target.
3. Calculation of target's CPA/TCPA, speed and course.
4. Conversion of data to display target data.
SPU Board
RADAR
(TRIG HD BP)
Echo position data
detector
D.P.RAM
BP Echo data
DSP (Digital Signal Processor)
D.P.RAM
Candidate echo detected within echo detection
window.
MAIN CPU Processor
D.P.RAM
Key command
Target data
2-18
ARPA Board
RADAR
(VIDEO)
A/D conversion of input
analog video signal
processed with
GAIN, STC and FTC.
Front end
processor
X.Y)
SPU Board
CRT Display
FR2115-SME-15