Search results

  1. “Crawl Control” for the Cybertruck?

    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.
  2. Better safety through radar

    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...
  3. Better safety through radar

    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...
  4. Better safety through radar

    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.
  5. Better safety through radar

    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...
  6. Better safety through radar

    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...
  7. Better safety through radar

    In fact they use the NIR spectrum
  8. Cybertruck question

    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...
  9. Better safety through radar

    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...
  10. Better safety through radar

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

    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...
  12. Better safety through radar

    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...
  13. Better safety through radar

    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...
  14. Better safety through radar

    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...
  15. Better safety through radar

    Check out the ToF cameras JBee mentioned earlier.
  16. Better safety through radar

    That's actually a good assumption. Yes, you would were it not for the fact that covariance of the parameter estimates is not the only thing under consideratiion here with cost, marginal improvement added by a sensor, complexity, weight, power consumption, component availability.... being some...
  17. Lordstown Motors, Camping World Partner On Future Electric RV, Servicing

    The typical panel that goes on a roof produces, after conversion losses, about 290 W in full sun. To give you an idea of size I have 45 of them on the roof of my generously sized 3 car garage. A typical SC will deliver 150 kW. It would take 150000/290 = 517 of these panels which would cover 11.5...
  18. Better safety through radar

    If the GDOP goes down more than the noise goes up the estimate is improved. That's the reason one has multiple sensors. Telsa's argument for dropping radar was that the overall gain improvement from it was not worth the extra processing effort..
  19. Better safety through radar

    If you are thinking like Hercule Poirot, IOW, distinguishing between seeing and observing that is correct. We see all the photons but an image is made by deconvolving the received image with the sensor transfer function. Our brains have deconvolution filters that are deigned tp give ius the...
  20. Better safety through radar

    Radar is just another sensor that can be added to a system to enable the system to make a better estimate of the nature of its surroundings.


Top