RPI Module with GPS

The following is a breakdown of potential RPI modules with GPS to add to MS14’s telemetry package. More information about our current telemetry requirements can be found here: https://uwmidsun.atlassian.net/wiki/spaces/ELEC/pages/846266758/Telemetry%2BSystem%2BMS%2B14 All of the options below act as breakout board and are to be connected to the Pi.

Criteria	Option 1:	Option 2:	Option 3:
Sensitivity	-165 dBm sensitivity	-165 dBm sensitivity	-159 dBm sensitivity
Channel Size	66 acquisition channels 22 tracking channels	99 acquisition channels 33 tracking channels	16 channels for acquisition/tracking
Compatibility	USB to UART converter Works with standard Raspberry connection	USB to UART converter Working with standard Raspberry connection Supports Bluetooth 3.0, SMS, Phone Call, GPRS, DTMF, HTTP, FTP, MMS, and email	USB to UART Able to connect into RPI Supports telephone call, SMS, MMS, Mail, TCP, UDP, DTMF, HTTP, FTP Supports LTE CAT4 upto 150 MBPS for data transfer
Accuracy	Position known to be within 2.5m radius circle	Position known to be within 2.5m radius circle	Position known to be within 2.5m radius circle
CAD Price (after all costs)	$65.75	$59.88	$111.37
Documentation / Reviews	Moderate amounts of documentation. No reviews.	Detailed documentation and positive reviews here. Chip Information:	Extremely detailed documentation. Not too many reviews online.
Source	Link	Link	Link

Background Information:

GPRS = General Packet Radio Services. It is a packet-based wireless communication service that ensures data transfer rates from 56 to 114 Kbps and continuous connection to the Internet
GLONASS = GLObal NAvigation Satellite System. It is just a system of satellites and provides an alternative to GPS.
GNSS = Global Navigation Satellite System. This is an umbrella term that encompasses all global satellite positioning systems.
LBS = Location Based Services. General term for software that uses data from satellite navigation systems.
GPS = Global Positioning System.

The channels sort the undifferentiated signals from the satellite. Each acquisition channel has a frequency from a specific satellite; these channels work in parallel. Each channel typically operates in one of two ways; working to acquire the signal or to track it. Once the signal is acquired, it is continuously tracked unless lock is lost. If that happens, the channel goes back to acquisition mode and the process is repeated.

It is recommended to proceed with option 2. It has sufficient functionality, appears to work in outdoor conditions, and costs less. Below is the connection information for the RPI using option 2.