The San Diego Chirp Test Site is an area just outside 
San Diego Harbor for comparing Sub-Bottom Profiler (chirp) systems.
This location was choosen for it's ease of access rather than 
geology, thus all geologic settings are not included.  The
intent is for chirp operators to see if their system is working
and roughly how it compares with systems on other ships.  The
intention is that the comparison is done after the fact (not in
realtime) and thus does not require much time by the shipboard
personnel.

Lee Ellett's poster of March 2013
Map

Sproul
NewHorizon
Melville
Revelle

Acquisition Params      Sproul		New Hroizon	Melville	Revelle
Model			Knudsen 3260	Knudsen 3260	Knudsen 3260	Knudsen 3260
Pulse length (ms)	2	         8	        8		16
pings per minute	150	         75	        75		37.75
ship speed (kts)	11.1	         9.6	        11.2		10.25
frequency at start	2307	         2307	        2307		2307
frequency at end	5307	         5307	        5307		5307
ping start time (ms)    313/551/551      91	        890		921/171
TxPower	                2/1/1	         1	        1		1/1
RxGain	                0  	         2	        0		3/2
Processing Gain		1		 0		2		0
EchoStrength	        7/-6/-5	         5	        -10		-3/2
StartDepth	        0	         0	        250		0
EndDepth	        500/100/200      500	        750		500
DataRate	        20008.04  	 20008.004	16666.66	16666.66
SEG-Y sample interval   49               49             60              60
Frequency plots         Plot             Plot           Plot            Plot
Seismic sections        Plot             Plot           Plot            Plot


Signal Processing theory to observe:
1) The correlation process compresses the pulse length, but not to a spike, thus a long
   sweep/pulse has lower temporal resolution than a short sweep.
2) A longer sweep or pulse length has more energy (power*time) and thus more depth penetration,
   but the spatial resolution (pings per minute) is much lower.
3) The creation of an envelope is also called "basebanding" which lowers the frequencies.
   
See Notes - Paul's 2005 review of sub-bottom profilers, which discusses some of the 
   recording parameters and signal processing

Notes:
1) The pulse (sweep) length controls the ping rate or spatial resolution.
2) The bad sample interval of 49 has been corrected
3) Synchonisation with the  EM120 may cause lower spatial resolution (pings per minute).