{
  "id": 254609,
  "title": "Relationship between speed and accuracy",
  "url": "/competitions/google-smartphone-decimeter-challenge/discussion/254609",
  "author_name": "",
  "post_date": "2021-07-22T17:46:32.834926300Z",
  "votes": 4,
  "comment_count": 4,
  "views": 0,
  "content": "<p>I don't know why a slow speed or stopped point would worsen the accuracy. If anyone knows more, please let me know.</p>",
  "messages": [
    {
      "id": "1397037",
      "postDate": "07/22/2021 17:46:32",
      "content": "<p>I don't know why a slow speed or stopped point would worsen the accuracy. If anyone knows more, please let me know.</p>",
      "rawMarkdown": "I don't know why a slow speed or stopped point would worsen the accuracy. If anyone knows more, please let me know.",
      "votes": null
    },
    {
      "id": "1397232",
      "postDate": "07/23/2021 00:24:05",
      "content": "<p>The closest thing I have found is:</p>\n<blockquote>\n  <p>Speed calculations will be more accurate at higher speeds when the ratio of positional error to positional change is lower.</p>\n</blockquote>\n<p>Which is the quote from next wikipedia page and logically  it can be interpolated to the position measurement realm: <a href=\"https://en.wikipedia.org/wiki/Speedometer\" target=\"_blank\">https://en.wikipedia.org/wiki/Speedometer</a></p>\n<p>Still, there are no references so I have no idea how to verify this statement ¯_(ツ)_/¯</p>",
      "rawMarkdown": "The closest thing I have found is:\n\n> Speed calculations will be more accurate at higher speeds when the ratio of positional error to positional change is lower.\n\nWhich is the quote from next wikipedia page and logically ~~maybe~~ it can be interpolated to the position measurement realm: https://en.wikipedia.org/wiki/Speedometer\n\nStill, there are no references so I have no idea how to verify this statement ¯\\_(ツ)_/¯",
      "votes": null
    },
    {
      "id": "1397289",
      "postDate": "07/23/2021 03:21:22",
      "content": "<p>Speed measurement requires the position at the next time, so faster is better. Is the information at the next time also relevant for baseline position measurement?</p>",
      "rawMarkdown": "Speed measurement requires the position at the next time, so faster is better. Is the information at the next time also relevant for baseline position measurement?",
      "votes": null
    },
    {
      "id": "1397755",
      "postDate": "07/23/2021 13:19:41",
      "content": "<p>Well, from what I can tell the ratio of positional error to positional change isnt in speed units, so we can assume it to be some intermediate value. </p>\n<p>If we assume that in the best case real measurements of points A and B would be the same for slow and fast observer, we would divide by denominator which is the difference between points A and B and obtain the fact that positional error for slow objects is indeed bigger.</p>\n<p>But again, we assume that positional error would be sort of constant in both settings, so eee</p>",
      "rawMarkdown": "Well, from what I can tell the ratio of positional error to positional change isnt in speed units, so we can assume it to be some intermediate value. \n\nIf we assume that in the best case real measurements of points A and B would be the same for slow and fast observer, we would divide by denominator which is the difference between points A and B and obtain the fact that positional error for slow objects is indeed bigger.\n\nBut again, we assume that positional error would be sort of constant in both settings, so eee",
      "votes": null
    },
    {
      "id": "1398214",
      "postDate": "07/23/2021 21:18:40",
      "content": "<p>The reason seems to be that when the car is stopped, the position of the car and the building does not change, so the signal from multipath can be received stably.</p>",
      "rawMarkdown": "The reason seems to be that when the car is stopped, the position of the car and the building does not change, so the signal from multipath can be received stably.",
      "votes": null
    }
  ],
  "comments": [
    {
      "id": 1397232,
      "author_name": "avtobusbratiev",
      "author_url": "",
      "post_date": "07/23/2021 00:24:05",
      "content": "<p>The closest thing I have found is:</p>\n<blockquote>\n  <p>Speed calculations will be more accurate at higher speeds when the ratio of positional error to positional change is lower.</p>\n</blockquote>\n<p>Which is the quote from next wikipedia page and logically  it can be interpolated to the position measurement realm: <a href=\"https://en.wikipedia.org/wiki/Speedometer\" target=\"_blank\">https://en.wikipedia.org/wiki/Speedometer</a></p>\n<p>Still, there are no references so I have no idea how to verify this statement ¯_(ツ)_/¯</p>",
      "votes": null,
      "replies": [
        {
          "id": 1397289,
          "author_name": "bbtatsu",
          "author_url": "",
          "post_date": "07/23/2021 03:21:22",
          "content": "<p>Speed measurement requires the position at the next time, so faster is better. Is the information at the next time also relevant for baseline position measurement?</p>",
          "votes": null,
          "replies": []
        },
        {
          "id": 1397755,
          "author_name": "avtobusbratiev",
          "author_url": "",
          "post_date": "07/23/2021 13:19:41",
          "content": "<p>Well, from what I can tell the ratio of positional error to positional change isnt in speed units, so we can assume it to be some intermediate value. </p>\n<p>If we assume that in the best case real measurements of points A and B would be the same for slow and fast observer, we would divide by denominator which is the difference between points A and B and obtain the fact that positional error for slow objects is indeed bigger.</p>\n<p>But again, we assume that positional error would be sort of constant in both settings, so eee</p>",
          "votes": null,
          "replies": []
        }
      ]
    },
    {
      "id": 1398214,
      "author_name": "t88take",
      "author_url": "",
      "post_date": "07/23/2021 21:18:40",
      "content": "<p>The reason seems to be that when the car is stopped, the position of the car and the building does not change, so the signal from multipath can be received stably.</p>",
      "votes": null,
      "replies": []
    }
  ],
  "raw_markdown_by_id": {
    "1397037": "I don't know why a slow speed or stopped point would worsen the accuracy. If anyone knows more, please let me know.",
    "1397232": "The closest thing I have found is:\n\n> Speed calculations will be more accurate at higher speeds when the ratio of positional error to positional change is lower.\n\nWhich is the quote from next wikipedia page and logically ~~maybe~~ it can be interpolated to the position measurement realm: https://en.wikipedia.org/wiki/Speedometer\n\nStill, there are no references so I have no idea how to verify this statement ¯\\_(ツ)_/¯",
    "1397289": "Speed measurement requires the position at the next time, so faster is better. Is the information at the next time also relevant for baseline position measurement?",
    "1397755": "Well, from what I can tell the ratio of positional error to positional change isnt in speed units, so we can assume it to be some intermediate value. \n\nIf we assume that in the best case real measurements of points A and B would be the same for slow and fast observer, we would divide by denominator which is the difference between points A and B and obtain the fact that positional error for slow objects is indeed bigger.\n\nBut again, we assume that positional error would be sort of constant in both settings, so eee",
    "1398214": "The reason seems to be that when the car is stopped, the position of the car and the building does not change, so the signal from multipath can be received stably."
  },
  "source": "meta"
}