Getting Started with Hyper Precise Location
Getting Started
Hyper Precise Location Coverage Maps
https://thingspace.verizon.com/resources/support/coverage-map/
Unselect LTE and LTE-M layers to show RTK and DGNSS coverage.
Hyper Precise Location coverage is updated frequently as deployment expands
Access and Tokens
Our security policies require that you have different sets of credentials to access different parts of the ThingSpace Platform and APIs.
If you haven't already obtained the access tokens you can click here to follow the guide on How to Obtain Tokens
To learn all the details about credentials and tokens you can click here to view the Credentials and Tokens section
In order for getting the Hyper Precise Location Service, the device (client) has to get authenticated with the OAuth 2.0 server and obtain a bearer token and URL for the Hyper Precise Location Server. For mutual authentication, the device and OAuth server use Mutual Transport Layer Security (MTLS). The device and OAuth server confirm to RCF 6749.
Device vendors can obtain signed X.509 certificates from any of the known Certificate Authorities (CA), such as DigiCert, Commodo, GoDaddy, etc.
Client Authentication using Mutual Transport Layer Security (MTLS)
Clients can be authenticated using MTLS. A new scope will be defined for each client that wants to get authenticated via this path.
The information for client authentication using MTLS for the Hyper Precise Location service:
| Value | Description |
|---|---|
| URL | https://auth.thingspace.verizon.com/oauth2/token |
| Method | POST |
| URL Parameters | None |
| Request Example | curl -X 'POST' -d 'grant_type=client_credentials&scope=ts.bullseye&client_id={IMEI}' -H 'Content-Type: application/x-www-form-urlencoded' 'https://auth.thingspace.verizon.com/oauth2/token' --cert {CLIENT_CERT} --key {CLIENT_KEY} |
| Response Code and Content | Response Code: 200 OK Content:“access_token”: “{token}", “expires_in”: 86400, “scope”: “ts.bullseye”, “server_address”: “http://random.bullseye.server.url.com:1234”, “token_type”: “bearer” } |
Response Parameters
If an Access Token request is successful and authorized, the Auth service will return an access token and an optional refresh token as described in RFC 6749 Section 5.1. The response will be a JSON object with the following properties:
| Parameter | Description |
|---|---|
| access_token required | The Access Token created by Auth Service. This is required to make User Services API calls. |
| token_type required | Specifies the type of token. bearer is currently the only valid value. |
| expires_in | Specifies the lifetime, in seconds, of the Access Token. |
| scope required | Specifies the scope requested by the client. |
| server_address | Specifies the address of the server for further communication using the Access Token |
For more information on the code and token response_type, see RFC 6749 Section 4.1 and Section 4.2
Setting a Reply Path
Once all devices are activated, a GET /caster request needs to be sent with current location data to be corrected.
curl -v -H 'Authorization: Bearer {bearer token}' -H 'Ntrip-Version: Ntrip/2.0' -H 'Ntrip-GGA: {GPGGA data}' http://caas.hyperlocation.io:2100/CASTER --output -
* Trying 34.215.0.140...
* TCP_NODELAY set
* Connected to caas.hyperlocation.io (34.215.0.140) port 2100 (#0)
> GET /CASTER HTTP/1.1
> Host: caas.hyperlocation.io:2100
> User-Agent: curl/7.64.1
> Accept: */*
> Authorization: Bearer {bearer token}
> Ntrip-Version: Ntrip/2.0
> Ntrip-GGA: {GPGGA data}Successful request:
< HTTP/1.1 200 OK
< Connection: keep-alive
< Content-Type: gnss/data
< no chunk, no close, no size. Assume close to signal endFailed request:
< HTTP/1.1 401 Unauthorized
< Connection: close
< WWW-Authenticate: Basic realm="Secure Area"
< Date: Mon, 19 Apr 2021 19:26:36 GMT
< Content-Length: 41
<
* Closing connection 0Getting GPGGA Data
This is the device's current location (GPS) information needing correction and it conforms to the NMEA 0183 standard.
The GPGGA data is generated by the software being used and examples of output and more information can be found in the Wikipedia page about NMEA 0183.
The GPGGA data is a string of 16 comma seperated values (with a line feed or carriage return at the end as the 17th character) or a "Sentence". An example looks like this:
$GNGGA,150322.00,3256.78980,N,09649.10378,W,1,12,0.93,209.0,M,-25.2,M,,,*7E
| Position | Structure | Description | Format | Example |
|---|---|---|---|---|
| 1 | $GNGGA | Log Header | n/a | $GNGGA |
| 2 | utc | UTC time status of position (hours/minutes/seconds/ decimal seconds) | hhmmss.ss | 150322.00 |
| 3 | lat | Latitude (decimal degrees: DDmm.mm) | numeric | 3256.78980 |
| 4 | lat dir | Latitude direction (N = North, S = South) | Single alpha character | N |
| 5 | lon | Longitude (decimal degrees: DDDmm.mm) | numeric | 09649.10378 |
| 6 | lon dir | Longitude direction (E = East, W = West) | Single alpha character | W |
| 7 | quality | GPS Quality Indicator. See the "Quality Indicator" table below | numeric | 1 |
| 8 | # sats | Number of satellites in use. May be different to the number in view | numeric | 12 |
| 9 | hdop | Horizontal dilution of precision | numeric | 0.93 |
| 10 | alt | Antenna altitude above/below mean sea level | numeric | 209.0 |
| 11 | a-units | Units of antenna altitude (M = meters) | Single alpha character | M |
| 12 | undulation | Undulation - the relationship between the geoid and the WGS84 ellipsoid | numeric | -25.2 |
| 13 | u-units | Units of undulation (M = meters) | Single alpha character | M |
| 14 | age | Age of correction data (in seconds) The maximum age reported here is limited to 99 seconds. | numeric | (empty when no differential data is present) |
| 15 | stn ID | Differential base station ID | numeric | (empty when no differential data is present) |
| 16 | *xx | Check sum | *hh | *7E |
| 17 | [CR][lf] | Sentence terminator (Carriage Return or Line Feed) | n/a | [CR][lf] |
Quality Indicator
| Indicator | Description |
|---|---|
| 0 | Fix not available or invalid |
| 1 | Single point |
| 2 | Pseudorange differential |
| 4 | RTK fixed ambiguity solution |
| 5 | RTK floating ambiguity solution |
| 6 | Dead reckoning mode |
| 7 | Manual input mode (fixed position) |
| 8 | Simulator mode |
| 9 | Wide Area Augmentation System (WAAS) This is the United Sates standard of the regional Satellite-based Augmentation Systems (SBAS) |