RADAR E&H FMP45

3d sensing and mapping in an unmanned submarine or an academic robot project is far more interesting than this.

Read the manual.

offset = 1

block distance = 20,000

mapping = all

Offset is basically the position of your transmitter in relation to the picture shown on the screen, you can usually alter the offset to show more distant reflections from in front of the transmitter than from behind and vice-versa. It essentially moves the icon of the transmitter higher or lower on the screen as required.

Blocking distance is a term that I am not familiar with but I assume that it refers to the inability of the receiver to see near objects. This is normally called minimum range or similar. The reason for minimum range is that a radar transmits a very high power electromagnetic pulse which must be isolated from the receiver or it would overload it. A device called a circulator sequentially turns the transmitter and receiver on and off to protect from this overload condition. Obviously there is a small time lapse between the transmitter pulse ending and the receiver becoming active. During this time lapse, reflections from close objects will not be detected by the receiver and are thus classified as being inside the minimum range (or possibly what your manual calls "the blocking distance). Note that this is a different effect from blind range which is simply loss of detection range due to some obstruction in the path of the transmitter.

Mapping on your device likely refers to the ability of the radar electronics to place your transmitter on a map, to show the position of reflections with reference to that map (ie coastline, islands, headland etc for marine purposes) and even to show your course over ground if it is a marine type unit. They normally incorporate GPS technology to assist in this endeavour.

After having said all of the above, I then checked out what your particular unit is and found that none of what I stated was relevant to that device, and since I know nothing of its operation, please ignore it all....

Thnaks for your ideas

pls i want to know more about mapping process in radar level transmitters

pls any one

Did you ring E+H?

Actually, the circulator does not act as a switch. It circulates the signal to and from the antenna. The transmitter signal will move only out to the antenna, and the signal coming back from the antenna circulates in the same direction towards the output. It is a stripline transformer sandwitched between two magnets. The magnetic field causes the signal to rotate around the device in one direction only.

The reason there is a minimum distance limit is that the reciever must be able to distinguish between the reflected signal from the transmitter due to mismatch and the reflections due to objects. The closer the minimum distance, the more likely there is to be interference from the transmitter itself.

Oh wow - you've discovered the wonderful world of E&H and their manuals, translated from German, with finely crafted pictorials designed to be confusing, haven't you? I can't help you as I am currently trying to figure out the FTW325, with little success. My sympathies to you.

Try the instrument distributorship - they usually have trained personnel or will get contact E&H and get you an answer.