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HPx-400e PCIe Radar Input Card

Radar Interface Hardware

The HPx-400e is a high-performance PCI express single or dual stream primary radar acquisition card, capable of capturing and processing analogue and digital primary radar video from up to two independent radars. The dual stream HPx-400e variant supports a number of multi-channel input modes, including dual redundancy and fully independent dual-stream capture. This flexibility allows the number of radar input cards to be reduced while retaining system capability.

The HPx-400e interfaces to analogue or digital radar signals, and provides a flexible set of input options to handle a wide range of radar types. A flexible mixing capability allows a combination of analogue and digital inputs to be captured and combined. The HPx-400e card provides a dual set of inputs, allowing up to two independent radars to be connected to the same card.

The analogue video inputs are captured at up to 100 MHz using high precision analogue to digital converters at 12 bits resolution. The captured video can be optionally down-sampled to reduce the data rate before transfer across the PCI express bus, using high-speed DMA. On the host computer, a driver and board-support library for Windows or Linux is available. Additionally, the SPx software suite is available to provide a full complement of radar processing functions including scan conversion and target tracking.

An on-board FPGA provides data processing and control and offers capability for expanding the data processing functions for customised applications.

Input Signals

The HPx-400e accepts radar video, trigger and azimuth signals in the form of ACP/ARP or parallel data. A wide variety of signal types and input voltages are supported, allowing the card to support many different radar models. The card provides a capability to detect missing signals in order to provide software alarms for loss of triggers or azimuth data. The companion HPx-180 card may be used with synchro or resolver signals, providing synchro-toparallel conversion.

Board Support Library and SPx Processing

A low-level board support library is available to provide a C++ class interface to configure the board and capture video, providing low-level access to the video samples. Example code is available for Windows and Linux.

Alternatively, Cambridge Pixel’s extensive SPx software is available to provide advanced processing and display of the radar video data. SPx software can be supplied in the form of a library for use in custom application code or as ready-made applications, such as SPx Server, which have built-in support for the HPx-400e card.

The SPx library provides an extensible toolkit of radar specific functions that can be linked together to form a processing chain. Custom functions are easily incorporated into the processing chain, allowing an application to be built from a combination of SPx library functions and user-written processing modules. Cambridge Pixel’s ready-to-run applications offer solutions for both server-side processing and network distribution and for client-side receipt and display.

Dual-Stream Functionality

The HPx-400e provides two fully independent radar input channels, which may be used in a number of ways:

  • Dual sampling of one radar video at different rates – typically this might be higher sampling for short ranges, to get maximum close-in detail, with lower sampling across the full radar range, to give maximum coverage.
  • Dual redundant mode – software-controlled automatic failover from one input channel to the other in the event of loss of trigger, ACP or ARP signal.
  • Dual independent radars – simultaneous, independent capture of two separate radars.
  • PCIe Primary Radar Acquisition Card
  • Dual radar inputs, two sets of:
    • Analogue video
    • Trigger
    • ACP/ARP
  • Independent sampling on each channel
  • Dual independent sampling on the same channel
  • Dual redundancy support (auto-switch across channels)
  • 100 MHz sample rate
  • 12-bit A-to-D for analogue samples
  • Wide range of input signal support:
    • Single-ended, RS422 or open-collector
    • Single-ended voltages up to 60V
    • 50 Ohm, 75 Ohm or high impedance video input
  • Signal status LEDs
  • Opto-coupled inputs for noise immunity
  • Parallel azimuth
  • Optional synchro input from companion synchro-to-parallel card (HPx-180)
  • Programmable pre-trigger compensation
  • Optional end-of-range input signal
  • Programmable mixing of analogue and digital videos
  • General purpose input/output lines
  • Loss of signal detection
  • High-speed DMA transfers
  • Supported under Windows and Linux
  • C/C++ board support package
  • On-board test pattern generator
  • Fully supported by SPx software
  • Wide range of radars supported including:
    • Furuno
    • Kelvin Hughes
    • Terma
    • JRC
    • Koden
    • Sperry
    • Raytheon
    • Specialist Military Radars
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Cambridge Pixel
HPx-400e PCIe Radar Input Card

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