Input Files for OASM

 

Table 13: OASM input file structure. Terms in bracket in Block V are for plane wave beamforming (option W).

Input parameter	Description	Units	Limits
Block I: TITLE
TITLE	Title of run	-	80 ch.
Block II: OPTIONS
A B C	Output and computational options	-	40 ch.
Block III: FREQUENCIES
FREQ1, FREQ2, NFREQ, COFF	FREQ1: Minimum frequency	Hz	>0
	FREQ2: Maximum frequency	Hz	>0
	NFREQ: Number of frequencies		>0
	COFF: Integration contour offset	dB/
Block IV: RECEIVER ARRAY
NRCV	NRCV: Number of receivers in array	-	>0
Z,X,Y,ITYP,GAIN	Z: Receiver depth	m
.	X: x-offset of receiver	m
.	Y: y-offset of receiver	m
.	ITYP: Receiver type	-	>0
	GAIN: Receiver signal gain	dB
Block V: REPLICA SPACE
ZMINR,ZMAXR,NZR	Depth (grazing angle) interval	m ()	(-90-90)
XMINR,XMAXR,NXR	x (bearing) interval	km ()	(-360-360)
YMINR,YMAXR,NYR	y (dummy)	km
Block VI: REFERENCE SOUND SPEED (Option W)
CBEAM	Reference speed for plane wave replicas	m/s
Block VII: TOLERANT BEAMFORMER (Option T)
CLRMIN,CLRMAX,NCLR	Coherence lengths for replicas	m
TOLR	Tolerance
Block VII: SIGNAL BLURRING (Option K)
CLS	Coherence length for signals	m

The input file for OASM is structured in 7 blocks, the first 5 of which, shown in Table 13 contain data which must always be given, such as the frequency selection, receiver array and replica sampling. The last 3 blocks should only be included for certain options as indicated. The various blocks and the significance of the data is described in the following.