Recent content by ajdelange

Yes the logic is ultimately implemented in analogue circuitry but the SNR is so high in these circuits that the probability of bit error is vanishingly small and parity check bits render it effectively 0. Once the weights have been fixed the transfer function is completely deterministic.

Well it is LIDAR in the sense that any device that does detection and ranging in the light frequency band is that. In the current context of a geo mapping device on a car LIDAR is generally understood to mean a device which fires a laser beam at a point and waits for returns measuring TOA and...

We've had those for years. A phaser is a piece of signal processing equipment that splits the incoming signal into two paths. One goes straight through and the other through one or more all-pass filters with adjustable delay. When the two are recombined some frequencies are notched with the...

Have you checked the heat of fusion of water? I believe that's been enabled. Cameras use NIR. To detect temperature of objects we need to be in the deep IR with its germanium lenses - way too expensive.

MASER = Microwave Amplification by Stimulated Emission Radiation LASER = Light Amplification by Stimulated Emission Radiation We don't have Midar because the long wavelengths imply poor resolution of targets in azimuth and elevation but we do have LIDAR which does have excellent az/el...

They don't call it LIDAR because it isn't LIDAR because there is no scanning AFAIK. LIDAR does not imply data collection any more than RADAR or SONAR does. They all collect data. Now of course I don't have any design data on ToF and I conclude that there is no scanning because the description...

In fact they use the NIR spectrum

I have to agree that the Tesla HPWC is probably the best solution but not the only one, of course. The current Gen 3 HPWC can share power with other HPWC and the only requirement is that they must be on the same WiFI net. Installation is fairly simple, they are $400 and, best of all, back in...

There are radars that scan and phased array radars that don't. I've never seen or heard of a LIDAR that doesn't scan but perhaps there are some. The ToF cameras are not really radars in fact. They evidently use a pulsed NIR illuminator and measure the time of flight to each pixel. The lens is...

Not LIDAR. No scanning. It’s actually radar with very good resolution in x, y, x and t.

The signals are doubtless spread using long codes for good doppler resolution and fast chipping for good range resolution so a relatively short distance from the car their density is probably below the noise floor of the receiver. And the codes are obviously orthogonal so this problem is not a...

Most LIDAR use 905 or 1550nm. The lower end of the visible spectrum is 780 nm (red) thus LIDAR operates in the NIR, It should not be surprising that light at LIDAR is scattered by rain and fog droplets. But LIDAR is gated. Thus one can discriminate against rain and fog to some extent by gating...

Don't know if this is a typo but the earliest radars were in the high HF and low VHF bands i.e. that 70 should be 70 mHz. The thing that turbed Watson-Watt's idea into a reality was the availability of TV tubes (or in his case "valves"), I suppose the first real radar was the British...

Insight comes from the strangest places. These posts make it clear than the frequentist approach to probability just doesn't work for things like weather forecasts. And indeed NWS's definition uses Bayesian language. They say a 30% probability of rain means a 30% chance of 0.01" or more within a...

Check out the ToF cameras JBee mentioned earlier.