Hello. Do any of you know what the data sent from the fishfinder transducer to the processor looks like (of course, I know that before they go to the processor, they will go through several electronic ADC converters, etc ...) ? Will I find any files somewhere? How much of this data is to be sent? Does it look like an audio file? If I would like to send via RF what speed would I have to have?
Please post a link to the datasheet of the item.
Of course, I mean the standard 83/200 kHz eg transducers:
Thanks. You tried but that is a sales site and it does not present the engineering data needed.
Looks like one wire per frequency plus a Ground. And the wires are bi-directional, the transduce acting as both a sender and receiver.
I'm guessing you will need separate bi-directional for each channel. The 800 kHz transducer would need a 1.6 MHz bandwidth channel. That one signal would take up almost the entire 433 MHz ISM band is (1.74 MHz wide). I think you will need one of the higher ISM bands: 915 MHz, 2.45 GHz, 5.8 GHz...
Perhaps eight different channels (Send and Receive for the 4 transducers).
the data sent from the fishfinder transducer to the processor looks like
It is just a ragged pulse. Example:
The fishfinder works like any other ultrasonic ranging device. It sends out a pulse, and waits for echos. The distance to objects is determined by the round trip time and speed of sound in water.
To distinguish fish from hard bottom, soft bottom or weeds, the amplitude and width of the echo peaks can be interpreted. The manufacturer will most likely consider the algorithms to do that as trade secrets.
if I would like to send this information aplitude via RF in real time e.g. via 2.4GHZ, what transmission / speed would I need?
First, please explain how you will get the "information" (depth, bottom hardness etc ).
Edit: I see you edited your question.
I'm sorry, I told you, it is about sending the aplitude in real time, in other words when I would like to draw the structure of the bottom on the receiver on the shore.
Most people just transmit the numerical results from the depth sounder.
Why on Earth would you want to send the raw pulse data?
How would you interpret the raw data?
Perhaps I could make a simple application on the phone that would process such an impulse to visualize the depth and simple structure of the bottom. I would like to send the data from the prototype of my remote-controlled boat which is used to measure water purity. I am curious what data transfer for RF I would need. What do you think ? Can I find sample data from such echo sounders somewhere?
Perhaps I could make a simple application on the phone that would process such an impulse to visualize the depth and simple structure of the bottom.
No, it would not be simple.You would also need special equipment to digitize and transmit the required high volume of data, at high speed.
I am curious what data transfer for RF I would need.
Evidently, you did not read reply #5, so go back and absorb that information.
Can I find sample data from such echo sounders somewhere?
Best to obtain it yourself, by monitoring the return pulse from a depth sounder. You need to know the conditions and structure of the body of water from which the data are taken, in order to interpret it.
Post 24 and 31 here show you what kind of signal you obtain with an echosounder (different than yours but it is a starting point).
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