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OEM GPS Boards - Sensitivity Level Comparisons

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  • OEM GPS Boards - Sensitivity Level Comparisons

    Talks in this thread: http://www.mp3car.com/vbulletin/showthread.php?t=41920 have inspired me to do a research on the sensitivity levels of OEM GPS boards. I'd like to share what I've researched so far. Some notes:
    • This research is done entirely through the utilization of the Internet by browsing the specification sheets of different GPS boards produced by different manufacturers
    • This is not to be mistaken with an exhaustive side-by-side lab tests
    • The information is laid out as follows: manufacturer, model, sensitivity in dBm (if available), sensitivity in dBW, tracking or acquisition sensitivity type (if available)

    So here's the list:
    • Garmin (www.garmin.com)
      • GPS25LV: -165dBW
      • GPS15LV/LH: -165dBW
    • GlobalSat (www.globalsat.com.tw)
      • ET102: -170dBW
      • ET202: -170dBW
      • ET301: -175dBW
      • ET401: -159dBm = -189dBW
    • Laipac (www.laipac.com)
      • TF-10: -175dBW
    • Qinetiq (www.qinetiq.com)
      • Q20:
        • -185dBW (tracking)
        • -180dBW (acquisition)
    • u-blox (www.ublox.com)
      • TIM-LH:
        • -158dBm = -188dBW (tracking)
        • -152dBm = -182dBW (acquisition)
      • TIM-LR (this is the engine on the SBR-LS board):
        • -149dBm = -179dBW (tracking)
        • -140dBm = -170dBW (acquisition)

    Hopefully you've noticed, some boards are more sensitive than others. If we take TIM-LH which is among the ones with the most sensitivity levels, is designed for indoor GPS, urban canyons & dense foliage, covert applications, etc. I had planned to purchase the combination of u-blox TIM-LR and Murata gyroscope for Dead Reckoning (DR). I have since changed my mind to purchase the TIM-LH instead due to the more complex in-vehicle mounting requirements of the DR (interface to external sensors such as speed pulse/wheel tick, etc.)

    Please add to this list other boards' sensitivity levels. Also, if you are researching DR, please share your research if you would. Maybe we can compare notes.
    EPIA Nehemiah M10k, M1-ATX, 20GB 4200 RPM 2.5", 256MB RAM, Win XP Home, Gyration RF Keyboard & Mouse, Zoltrix Nightingale Optical 4.1 PCI Sound Card, Lilliput 619GL-70NP, XM-PCR w/ optical upgrade, Garmin GPS-25LVS, Microsoft MN-710 USB Wireless NIC

  • #2
    How much is it costing you? Will you get fast lock times?
    PowerVoice v1 | NaviVoice Source
    GammaControl v2.4
    SKINbedder v3

    1995 Lexus SC300

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    • #3
      fast lock times? my gps 15LV goes from power on to a 6 to 7 sat lock in about 4 seconds, goes to 11 to 12 sat lock in about 10 seconds. Which in turn means I have gps fix even before my computer comes out of hibernation.
      肚子笑痛了
      S60 Install

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      • #4
        Originally posted by jcdillin
        fast lock times? my gps 15LV goes from power on to a 6 to 7 sat lock in about 4 seconds, goes to 11 to 12 sat lock in about 10 seconds. Which in turn means I have gps fix even before my computer comes out of hibernation.
        So, how do you know that the computer has locked on to the sats if you can't see the status of them because the computer is resuming from hibernation? Does your garmin have dead reckoning?
        PowerVoice v1 | NaviVoice Source
        GammaControl v2.4
        SKINbedder v3

        1995 Lexus SC300

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        • #5
          @0l33l: Currently I'm still using the Garmin GPS25LV. The specification sheet says that it takes 15 seconds when all data is known. It has an internal memory powered by a rechargable battery that maintains the memory of the last postion prior to its main power supply being shut down.

          In all actuality though, by the time my computer comes out of hibernation (less than 10 seconds) I'm already getting a locked position. I care less about how many satellites the GPS receiver is actually receiving. Just as long as it has got a locked position and is able to relay that information to my navigaion software that I'm good to go.
          EPIA Nehemiah M10k, M1-ATX, 20GB 4200 RPM 2.5", 256MB RAM, Win XP Home, Gyration RF Keyboard & Mouse, Zoltrix Nightingale Optical 4.1 PCI Sound Card, Lilliput 619GL-70NP, XM-PCR w/ optical upgrade, Garmin GPS-25LVS, Microsoft MN-710 USB Wireless NIC

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          • #6
            This makes me want to get rid of my earthmate I have a plan of doing a speedometer based on GPS, so dead reckoning would be vital. The garmin unit unfortunately doesn't have it
            PowerVoice v1 | NaviVoice Source
            GammaControl v2.4
            SKINbedder v3

            1995 Lexus SC300

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            • #7
              None of Garmin's OEM boards, you are right. You can always buy the 2660, though.

              Although at the beginning of the thread I've mentioned that I'm buying u-blox's TIM-LH, I'm back to weighing my decision between it and the SBR-LS (TIM-LR) with gyro module. I'm still wondering: sure the TIM-LH is sensitive but how sensitive is it exactly? If I'm in a multi-floor parking building, will it still be getting and able to interpret the signals?

              On the other hand: how accurate or close to accurate will the SBR-LS actually be?

              Most of it I guess depends on whether I want to go ahead and plunge my self to buying and testing it. Also, time to do the research seems to be scarce nowadays.
              EPIA Nehemiah M10k, M1-ATX, 20GB 4200 RPM 2.5", 256MB RAM, Win XP Home, Gyration RF Keyboard & Mouse, Zoltrix Nightingale Optical 4.1 PCI Sound Card, Lilliput 619GL-70NP, XM-PCR w/ optical upgrade, Garmin GPS-25LVS, Microsoft MN-710 USB Wireless NIC

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              • #8
                Originally posted by edikp
                None of Garmin's OEM boards, you are right. You can always buy the 2660, though.

                Although at the beginning of the thread I've mentioned that I'm buying u-blox's TIM-LH, I'm back to weighing my decision between it and the SBR-LS (TIM-LR) with gyro module. I'm still wondering: sure the TIM-LH is sensitive but how sensitive is it exactly? If I'm in a multi-floor parking building, will it still be getting and able to interpret the signals?

                On the other hand: how accurate or close to accurate will the SBR-LS actually be?

                Most of it I guess depends on whether I want to go ahead and plunge my self to buying and testing it. Also, time to do the research seems to be scarce nowadays.
                I'd love to see someone do this and test it out. The modle is also SiRF compatable, right?
                PowerVoice v1 | NaviVoice Source
                GammaControl v2.4
                SKINbedder v3

                1995 Lexus SC300

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                • #9
                  .

                  Garmin's 15h/l have an internal battery that can last up to 21 days, it maintains a lock even when your computer is off...
                  Progress [I will seriously never be done!]
                  Via EPIA MII
                  512MB RAM
                  OEM GPS (embedded)
                  nLite WinXP pro on
                  1GB Extreme III CF card
                  Carnetix 1260 startup/ DC-DC regulator
                  Software: Still, re-Writing my existing front end in .Net

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                  • #10
                    Edited: Oops, intellaworks' respond sneaked in. This is the respond to 0l33l's last question.

                    I'm kinda waiting for updates by hklomann from the mentioned thread link above. Hopefully he continues to be forward and willing in sharing his information.

                    Which model? If you meant the TIM-LR & TIM-LH then they support: NMEA, UBX (u-blox's proprietary), and RTCM (FCC & US Coast Guard standard, according to www.rtcm.org).
                    EPIA Nehemiah M10k, M1-ATX, 20GB 4200 RPM 2.5", 256MB RAM, Win XP Home, Gyration RF Keyboard & Mouse, Zoltrix Nightingale Optical 4.1 PCI Sound Card, Lilliput 619GL-70NP, XM-PCR w/ optical upgrade, Garmin GPS-25LVS, Microsoft MN-710 USB Wireless NIC

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                    • #11
                      Originally posted by IntellaWorks
                      Garmin's 15h/l have an internal battery that can last up to 21 days, it maintains a lock even when your computer is off...
                      That's cool
                      Originally posted by edikp
                      Edited: Oops, intellaworks' respond sneaked in. This is the respond to 0l33l's last question.

                      I'm kinda waiting for updates by hklomann from the mentioned thread link above. Hopefully he continues to be forward and willing in sharing his information.

                      Which model? If you meant the TIM-LR & TIM-LH then they support: NMEA, UBX (u-blox's proprietary), and RTCM (FCC & US Coast Guard standard, according to www.rtcm.org).
                      I'll wait for the updates
                      PowerVoice v1 | NaviVoice Source
                      GammaControl v2.4
                      SKINbedder v3

                      1995 Lexus SC300

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                      • #12
                        www.deluo.com
                        GM-M305 (OEM module)
                        - Sensitivity: -165 dBW Minimum
                        Deluo GPS Lite
                        - Acquisition: -139 dBm
                        - Tracking: -152 dBm
                        Deluo GPS WAAS
                        -165dBW (Min.)
                        Deluo GPS Pro
                        -175 dBW
                        So far:
                        M10000 Nehemiah, 1Gb RAM, Opus 90w PS, Buffalo Tech WLI2-USB2-G54, 160 Gb HDD, GlobalSat BU-353 GPS, iGuidance, Zippy EL-610, Panasonic CW8123B Slim Slot CDRW/DVD, 10" Lilliput, Sony XA-300, Sony CDX-MP30 Head, OBD-II

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                        • #13
                          dBm to dBW

                          Thanks for this addition. Btw, if any of you ever need to do a conversion from dBm to dBW and vice versa then give this site a visit: http://www.part-15.org/calcs/dbmcalc/dBmCalc.html .
                          EPIA Nehemiah M10k, M1-ATX, 20GB 4200 RPM 2.5", 256MB RAM, Win XP Home, Gyration RF Keyboard & Mouse, Zoltrix Nightingale Optical 4.1 PCI Sound Card, Lilliput 619GL-70NP, XM-PCR w/ optical upgrade, Garmin GPS-25LVS, Microsoft MN-710 USB Wireless NIC

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                          • #14
                            I'm glad I ran into this thread. My earthmate is a pain in the *** to get working on a Mac, so its off in ebay land to be sold, while I am searching for a new one that can lock faster AND work with both Macs and PCs via USB (yes, I am aware I can get a serial one and then do a serial to USB convertor, but less hardware is better).

                            Deluo is one of the few that works with both either serial or USB, drivers for both PC and Mac with hardly any complaints.

                            Any others out there?
                            "If it works this good why F with it?" -KMFDM "Intro"

                            Strive for ethical wardriving: http://faq.wardrive.net/

                            My CarCPUs: v1 - 2000 | v2 - 2004
                            Mp3Car Meets: http://detrimental.org/eyecandy/MP3CarMeets

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