seminar agenda - airmar
TRANSCRIPT
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Seminar Agenda
• Overview of CHIRP technology compared to traditional fishfinder technology – What’s different?
• Importance of proper transducer selection & installation
• Maximize the performance of your electronics system
• Give feedback, offer product suggestions, and ask tough transducer questions
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Traditional “Toneburst” Fishfinder
• Traditional fishfinders operate at discrete frequencies such as 50kHz and 200kHz.
• This limits depth range, range resolution, and ultimately, what targets can be detected in the water column.
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Fish Imaging at Different Frequencies
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Koden CVS-FX1 at 4 Different Frequencies
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Range Resolution Comparison
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Toneburst with separated targets
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Toneburst w/out separated targets
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CHIRP without separated targets
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Traditional “Toneburst” Fishfinder
• Traditional sounders operate at discrete frequencies such as 50kHz and 200kHz.
• This limits resolution, range and ultimately, what targets can be detected in the water column.
• Tone burst transmit pulse may be high power but very short duration. This limits the total energy that is transmitted into the water column
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CHIRP
A major technical advance
in Fishing
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What is CHIRP?
• CHIRP has been used by the military, geologists and oceanographers since the 1950’s
• Marine radar systems have utilized CHIRP technology for many years
• This is the first time that CHIRP technology has been available to the recreational, sport fishing and light commercial industries….. and at an affordable price
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CHIRP Starts with the Transducer
• AIRMAR CHIRP-ready transducers are the enabling technology for manufacturers designing CHIRP sounders
• Only sounders using AIRMAR CHIRP-ready transducers can operate as a true CHIRP system
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1. Use broadband transducer (Airmar)
2. Transmit CHIRP pulse into water
3. Processing of return echoes by method of pattern matching (pulse compression)
CHIRP is a technique that involvesthree principle steps
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1. Use of a broadband transducer (Airmar)
What is bandwith?
Why is it important?
It’s all about BANDWIDTH!!
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80 kHz
1 kHz
So
un
d A
mp
litu
de p
er
Dri
ve V
olt
Frequency (kHz)
50 & 200 kHz
42-65 kHz 130-210 kHz
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Target detection
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1. Use broadband transducer (Airmar)
2. Transmit CHIRP pulse into water
CHIRP is a technique that involvesthree principle steps
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Transmit pulse is only at one discrete frequency.The short pulse limits the total energy that is transmitted into the water column
CHIRP sounders use a precise sweep pattern of many frequencies (i.e., 28-60 kHz or 130-210 kHz)
Requires a long duration transmit pulse in order to sweep through all of the frequencies.
In order to send a CHIRP pulse, the transducer MUST HAVE BANDWIDTH
Tone burst transmit pulse may be HIGH POWER but very SHORT DURATION
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• Toneburst fishfinders only send out a waveform at one frequency.
• If a long pulse is used at one frequency, you will lose resolution. Multiple fish will get lost in the long pulse and can not be distinguished.
Benefits to YOU…
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• The long transmit CHIRP pulse transmits more energy in the water column
– Up to 10-1000 times more energy on target!
• Will get different echo returns from all of the frequencies transmitted – which are then processed and shown on the display.
– Ability to sound deeper – (more amplitude)
Benefits to YOU…
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• The CHIRP sound wave that is transmitted is stored in memory
– Sounder knows the frequency band and pulse length that was transmitted
– The sounder listens for the return echo, and will match the echo received by the transducer with the reference wave form.
– AKA: Pattern Matching or Correlation
What else is different?
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1. Use broadband transducer (Airmar)
2. Transmit CHIRP pulse into water
3. Processing of return echoes by method of pattern matching(pulse compression)
CHIRP is a technique that involvesthree principle steps
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Reference
pulse
Incoming
echoreplica of
drive pulse
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Pattern Matching
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Pattern Matching
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Pattern Matching
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Pattern Matching
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Pattern Matching
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Pattern Matching
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Pattern Matching
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Pattern Matching
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Pattern Matching
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. . . etcetera
Pattern Matching
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Procedure for Pulse Compression
Shift, Multiply and Add
calculation performed by computer
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Reference
pulse
Incoming
echoreplica of
drive pulse
Co
rrel
atio
n
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Co
rrel
atio
n
Pulse Compression
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Co
rrel
atio
n
Pulse Compression
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Co
rrel
atio
n
Pulse Compression
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Co
rrel
atio
n
Pulse Compression
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Co
rrel
atio
n
Pulse Compression
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Co
rrel
atio
n
Pulse Compression
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Co
rrel
atio
n
Pulse Compression
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Co
rrel
atio
n
Pulse Compression
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Co
rrel
atio
n
Pulse Compression
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. . . etcetera
. . . etcetera
Co
rrel
atio
n
Pulse Compression
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Significantly improved signal to noise ratio
– Noise does not correlate with the stored waveform
– Ability to pull targets from the noise floor
– Bottom tracking at high speed and deep depths
Resolution
– Resolve individual targets – no blobs
– Crisp images
Why is pattern matching (pulsecompression) important?
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Advantages versus Disadvantages
Is a CHIRP system for YOU?
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• Operating in a noisy environment
CHIRP: Many advantages when the conditions are challenging
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• Operating in a noisy environment
• When detailed resolution is needed to separate individual fish (range resolution)
CHIRP: Many advantages when the conditions are challenging
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Tuna working on baitfish
R599LH & BSM2
Canary Islands – High CHIRP
Same big eye tuna found the shoal of
mackerel and started working on them
Gain has been turned down from left to right
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• Operating in a noisy environment
• When detailed resolution is needed to separate individual fish (range resolution)
• Crisp images
CHIRP: Many advantages when the conditions are challenging
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Crisp, detailed images
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• Operating in a noisy environment
• When detailed resolution is needed to separate individual fish (range resolution)
• Crisp images
• Bottom fishing – resolve targets close to the bottom or near structure
CHIRP: Many advantages when the conditions are challenging
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Gain: Large Fish on Medium CHIRP
Two large fish targets clearly
separated from each other over the bait
Gain at 91%
R109LM and GSD26
Scotland
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Incredibly sharp fish targets with
separation even in the dense shoals
Baitfish detached from the
main bottom signal return
Minimal ring-down
resulting from a low Q
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• Operating in a noisy environment
• When detailed resolution is needed to separate individual fish (range resolution)
• Crisp images
• Bottom fishing – resolve targets close to the bottom or near structure
• Searching for fish at high boat speeds
CHIRP: Many advantages when the conditions are challenging
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• Operating in a noisy environment
• When detailed resolution is needed to separate individual fish (range resolution)
• Crisp images
• Bottom fishing – resolve targets close to the bottom or near structure
• Searching for fish at high boat speeds
• Tracking bottom at deep depths
CHIRP: Many advantages when the conditions are challenging
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62
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•63
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• One transducer can offer offer 117 kHz of selectable frequencies
– Can I use a CHIRP transducer with a non-CHIRP sounder?
• Significant resolution improvements at low frequency
• More energy on target
• Up to 1,000 times greater sensitivity than traditional fishfinders
More advantages
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• Keep in mind – the display is limited by the available pixels.
– The deeper the depth, the less pixels available to show details is in the water column.
– CHIRP is able to show fine resolution/detail
– If too much range, the images will be limited by the resolution of the display
• Get a bigger monitor! (details will be lost)
Things to remember - disadvantage