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SPx Radar Web Server - Radar Video in a Browser

Tracking, Fusion & Distribution

Cambridge Pixel's SPx radar display technology is available for browser-based client displays, to support the display of radar video in standard internet browsers. This permits a wide range of device types, from desktop computers to tablets and smartphones, all to have access to radar imagery, with the radar processing handled by a remote server or cloud-based architecture.

A display solution that uses a standard web browser will automatically support a wide range of display devices from smart phones through to desktop workstations, with no special requirements beyond the support for the browser. This is the perfect solution when information needs to be shared with the widest range of users. For radar display, tablet devices using wi-fi or 4G/5G data links are an attractive option for displays that need to be portable.

Cambridge Pixel’s SPx Radar Web Server is a radar processing server that converts radar video into sequences of scan-converted images, which it can then serve to web browsers for display with maps, tracks and related symbology. A typical system architecture will have SPx Server at a radar site to receive and pre-process the radar video, then use SPx Radar Web Server to scan-convert and serve images to any number of connected browsers.

Each browser has its own unique view of the radar image, effectively having its own dedicated scan converter running in SPx Radar Web Server, allowing an operator to change scale and position independently of other users and to see the radar video at full resolution. In a cloud-based solution, a lightweight radar server (or HPx-346 unit) will receive the radar video and distribute it to a cloud-based server running SPx Radar Web Server. The client browsers then simply make HTTP requests for specific areas of radar data.

SPx Radar Web Server also handles track data (primary radar tracks, fused tracks, AIS, ADS-B), providing these in an extended GeoJSON format to connected browsers for rendering.

Independent Views

Rather than simply providing a fixed number of pre-selected views of the radar video to every client, SPx Radar Web Server effectively provides each client with its own dedicated scan converter.  This means that each client is provided with the optimal view of the region it requests, taking advantage of the full resolution provided by the radar.

The requests of all clients are fully independent, allowing them all to select their own view of the radar without affecting the others.  SPx Radar Web Server is licenced according to the maximum number of clients it will support.  Standard options are available for up to 100 clients but more can be suppported if the host has sufficient resources.  Alternatively, multiple a distributed approach is possible, with multiple servers sharing the radar data and serving fewer clients. 

Control

SPx Radar Web Server is configured at start up via configuration file and is then fully controllable at runtime via a client-side Javascript API.  The API allows client-side display applications to be built easily upon web-based mapping tools such as Google Maps and Bing Maps.  A built-in web client display is also provided.  

Each client selects its chosen view through query strings in the URL when making requests to the server. Furthermore, any other runtime parameter may also be controlled through the RESTful API.  This provides client apps with an extremely straightforward method of controlling the radar view and general operation of SPx Radar Web Server, without any reliance on Javascript.  

  • Radar display in a standard web browser:
    • Edge
    • Firefox
    • Safari
    • Chrome
  • Per-client, independent radar presentation (2, 5, 10, 25 or 100 clients)
  • Receives ASTERIX CAT240 radar video
  • GeoJSON track/AIS/ADS-B data
  • High quality scan conversion
  • Selectable radar colours
  • Fully configurable scale and off-centring
  • History trails
  • Radar overlay on ENC charts and maps
  • Target overlays
  • Secure protocols
  • Scan conversion on remote server or in cloud
  • Remote control of SPx Server
  • Moving platforms supported, using NMEA0183 navigation data
  • Sample client display
  • Full API support for custom development
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