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9

Your question is based in a fundamentally erroneous premise. Uplink communication to GPS satellites is not permitted, period. For public users and indeed most government ones, the system is downlink-only. It is intended to allow receivers to figure out where they are, but has no capability for sharing that information with others. For that, other means ...


7

I am not certain that this is an IoT question. I have the impression that those tracking devices would not get any GPS signal in shipping containers, trucks or buildings, where they would be most of the time. Also, I see the same issue regarding the connection to a cellular network or alike, especially in regions with bad network coverage. I have developed ...


6

For near-real time tracking of vehicles while out of cellular service range, Spot makes the Spot Trace, a vehicle tracker that uses satellite communication. It transmits only when the vehicle has moved or is in motion, and only as often as you configure it for, minimizing data traffic over the satellite link. It operates on alkaline batteries (for ...


6

As Bence says, it depends on the chip, and accuracy needed. But I'd like to add one thing: many GPSes output speed and heading (direction) in one of their NMEA sentences. If your GPS chip does this, you may use this directly, and won't have to calculate anything—simply use the values provided by the GPS.


5

It strongly depends on the MCU you have, but I think any microcontroller on the market could handle this task easily. Calculating velocity and direction from the coordinates is not a big deal. I think parsing the GPS sentences takes more CPU time. So if you are just tunneling the GPS data through the GPRS link, unprocessed, so the whole NMEA sentence in one ...


5

There's another idea, also from trackr's support page. Again, it's also a feature that can be enabled/disabled, and that is "Device alert." Basically, it warns when your phone can no longer make a bluetooth connection with your TrackR devices. If your TrackR device and/or smart phone is sounding off at seemingly random times, you may have device ...


5

SIMCOM SIM808 module seems to meet the requirements for your device. Bluetooth: compliant with 3.0+EDR Specification for GPS Receiver type 22 tracking /66 acquisition -channel GPS L1 C/A code Sensitivity Tracking: -165 dBm Cold starts : -147 dBm Time-To-First-Fix Cold starts: 30s (typ.) Hot starts: ...


5

The closest thing to what you appear to be looking for is probably the Iridium satellite network. This system is used by tracking/data logging products that need to work pretty much everywhere (including the middle of the ocean where there is no cell coverage). Examples of systems using Iridium include things like the Rock7 RockBLOCK. The link provides ...


4

Sooner or later you'll run out of terrestrial connectivity. Cables wont go everywhere you want to go. There are two methods for providing digital comms at sea - VHF and Satellite. You'll be pushing it to get useful Internet functionality via VHF, which leaves satellite as your best option. Satellites are what are providing you with GPS after all. Satellite ...


4

Water is a natural attenuator of electromagnetic waves, also you must take into account the obstruction of the Fresnel zones, knowing the frequency of the Wi-Fi wave and the distance of the link. One way to counteract this effect is to increase the height of the antenna.


4

As a person that created fleet management system processing data from devices with GPS receivers that currently serving two million units that consists from more then thousand of different types of such trackers from hundreds of manufacturers worldwide I have only one advice to you - do everything you can on the device side and rely on the server only for ...


3

If this only happens when the phone and the trackr's are separated, according to trackr's support page, This separation alert is an intended functionality. If you would like to disable this feature please check device settings to make sure that both iPhone Separation Alert and Device Separation Alert have the toggle set to the 'off' position (To change ...


3

Shameless plug In about a years time you can get an nRF91 + nRF52840 combo. LTE(CATM1 and NbIoT), GPS, BLE, USB, 802.15.4, etc, that uses a fraction of the power of current devices, and got plenty of µC-resources to spare.


3

If you are looking for a low-cost solution then I would recommend something like a teensy (cheap Arduino essentially with a lot of ram/flash) an XBee Series 2 63mW, an accelerometer, a GPS radio and a battery. The XBee will transmit up to 2 miles in rural areas (line of sight) so you will have a large range to read data from the device. XBees are also mesh ...


2

According to the FitBit community, the GPS is only enabled when you have turned on a tracking activity, example, walking, hiking, biking, etc. From the Fitbit Community: GPS is only when you are tracking an activity that uses GPS, such as hiking. As soon as you stop tracking that activity GPS is turned off. and By design, it should only turn on when ...


2

This question is likely better asked of FitBit directly through their help site. Yes, your GPS data is synced to the cloud, because it is retrievable using the FitBit developer's API as described in their API docs. Accessing it programatically requires a few hoops be jumped through, but disabling this feature and/or deleting stored data is not documented. ...


2

I almost wonder if this is a duplicate of this question that @Aurora0001 linked. I would suggest the LightBug again. It has got an 8 day battery life, plus solar recharging, if you can leave it attached on the outside of your purse. It's quite small (53 x 27 x 15mm), transmits to the LightBug servers every 15 minutes. It works indoors, and can even make ...


2

I suggest the Light Bug. It features: 8 day battery life Solar recharging Relatively small size (53 x 27 x 15mm) Transmission every 15 minutes Global satellite coverage (for GPS) Low weight (33 grams) The only thing I have not managed to determine is what happens if it loses contact with cell towers. I don't know if it would log location data points and ...


2

You'd track on several levels. You track the truck with GPS, not the products. You track the individual shipments with zigbee or RFID. Those technologies are a lot cheaper. Thus, it's affordable to put them in or on less expensive products. Between commercial end points both sides can verify each product by the WPAN technologies on arrival or on packaging ...


2

Regarding question 1: There is a vast amount of GPS trackers (accuracy of a few meters) that are commercially available and that come with their own tracking server accessible via app or web-interface. Normally, they either come with a built-in SIM-card or you have to put in a SIM-card yourself. The location is communicated either via SMS or via mobile data ...


1

Assuming the van as an ODB-2 port (most do) then you can just grab something like this. This assumes that you need something that reports in real-time, since you'd have to pay for a data plan. That one has an app so there must be some kind of api that it is reporting to; that system may have an open api you could leverage. Even if it doesn't, this one also ...


1

Firstly, how are you going to power your device? If you have a modern radio, or even a cigarette lighter USB adapter, then you can easily power an EDSP32, Raspberry Pi Zero W, BBC:Microbit, Arduino, etc. All of those could get the job done – with, in some cases, additionally Hat/Shields, so choose one that you are familiar with. I need to determine when a ...


1

Yes, this would be possible. Your product design consultancy should offer this as a recommendation. There are always 3 possibilities to be explored in product design: COTS (buy something that's already for sale). Re-purpose something similar. Design something custom. In this case there are many companies that make tracker type devices that have white-...


1

Heart Rate Sensor The heart rate sensor is based on photo phlethysmography based on blood absorbing light, this is low cost sensor with reasonable accuracy GPS Module GPS module has an accuracy of 2 - 3 meters, can also be used to measure speed, in combination of the below sensor (accelerator, gyro and magneto meter) accuracy can be increased Head Movement,...


1

I am trying to develop a security gadget which can be wearable. Congratulations. This sounds like a good idea. The first thing to worry about is power. Wait! Actually, that is the second. The fist is whether you want to create a new device, or whether it might not be better/easier to develop an app for a smartphone. But can be operate remotely from any ...


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