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-200 is a flexible, cost-effective PCI primary radar acquisition card that captures and processes one or two analogue or digital radar video signals from a single radar. When used with the SPx radar processing library it is possible to build radar distribution servers and integrated display solutions rapidly and cost-effectively. Alternatively, if you have your own processing software, HPx-200 is the ideal capture solution.
HPx-250 provides a similar set of capabilities to the HPx-200 but on the compact PMC form-factor. The PMC board may be fitted to a compact PCI (cPCI), VME or VPX processor card for a rugged embedded solution.
HPx-346 is the latest addition to the HPx family, combining radar interfacing and network video distribution into a compact, self-contained card. The HPx-346 interfaces directly to the analogue signals of a radar, digitises and packetises the radar video data, before sending it onto the network from its onboard Ethernet connector.
Cambridge Pixel's current range of HPx hardware builds on the field-proven HPx-100 (PCI) and HPx-150 (PMC) cards. All HPx cards are backwards compatible with previous generations of hardware, with the appropriate software support.
|HPx-400e||PCIe, x1 lane, full height||Active|
|HPx-200||PCI, half-length, full height||Active|
|HPx-200e||PCI, half-length, full height||Not for new designs|
|HPx-346||IEEE 1386 CMC or box-level product||Active|
|HPx-180||PCI/PCIe form-factor (no electrical bus interaction)||Active|
HPx hardware has been used to interface to many different types of radar, from small marine radars to large air surveillance and from legacy military radars to modern solid state radars.
The cards can be configured to handle a wide range of signal types, including differential and single-ended with signals up to 60V.
Analogue input videos are captured at up to 100 MHz (HPx-400e/HPx-346) or 50 MHz (HPx-200/HPx-250) sample rate 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 being transferred across the PCI/PCI express bus (using high speed DMA transfer) or sent onto the network, in the case of the HPx-346. An on-board FPGA provides data processing and control and also offers capability for expanding the data processing functions for customised applications.
On the host/receiving computer the SPx processing library may be used to provide a full complement of radar processing functions. Ready-made server and client display applications are also available to provide off-the-shelf solutions for common processing or display requirements.
Azimuth Input Options
All HPx radar input cards support input of ACP (bearing) and ARP (heading) control signals. 12-bit parallel azimuth RS-422 input is also supported directly on all cards except the HPx-346.
Synchro/resolver signals can be accommodated via the use of an HPx-180 companion card. The HPx-180 card accepts the reference and signal outputs from a synchro or resolver and converts them into a parallel azimuth output that can be accepted by an HPx-400e/HPx-200 card. The HPx-180 occupies a PCI/PCIe form factor but makes no electrical contact with the bus connector, so may be fitted into either type of slot.
Versions of the HPx-180 card are available to support synchros and resolvers with 115V reference/90V signals and those with 26V reference/11.8V signals.
SPx Radar Processing
The optional SPx radar processing library (see here) is an extensible toolkit of radar-specific functions that can be linked together to form a processing chain. Using this library, radar video can be processed to remove clutter, interference and enhance gain prior to network distribution or scan-conversion and display. Custom functions are easily incorporated into the processing chain.
SPx Distribution and Scan Conversion
The captured video may be compressed, distributed or displayed with the optional SPx library software. A complete server application, optionally incorporating radar recording, is built from just a few function calls into the SPx library. For integrated display solutions, the SPx scan-converter is easily connected to the HPx card's output to provide real-time radar video updates in Windows or Linux/X11.
The HPx-400e/200/250 cards can be purchased as OEM cards for integration into your projects. A software driver is available that handles all interaction with the card and presents a programming interface (API) in C/C++. The card is supported under Linux and Windows (7/8/10) as standard. You can expand the processing of the captured radar video using the related SPx software programming library. This provides a set of software modules for many common radar processing functions.
The HPx-346 may also be supplied as an OEM card or as a box-level product (please consult factory for options). In either case radar video data is output onto the network in an open format, so may be received and decoded with no special software requirements. However, the full power and flexibility of the SPx software is also available to receive and process this data.
A comparision of radar input card features is given in the table below.
|Form factor||PCI||PMC||PCIe||IEEE 1386 CMC
|Board Support API||✔||✔||✔|
|SPx Library Support||✔||✔||✔||✔|
|SPx Server Support||✔||✔||✔|
|Analogue Video Channels||2||2||2||1|
|Digital Video Inputs||8 bits||2 bits||8 bits|
|Trigger Input||✔||✔||✔ (2)||✔|
|ACP/ARP Inputs||✔||✔||✔ (2 sets)||✔|
|Synchro/resolver Input (via HPx-180)||✔||✔|
|Parallel Azimuth Input||✔||✔||✔|
|End of Range Signal||✔||✔||✔ (2)||✔|
|Programmable Video Mixer||✔||✔||✔||N/A|
|Max Return Length (samples)||64k||64k||64k||16k|
|Sampling Rate (per channel)||50MHz||50MHz||100MHz||100MHz|
|Video Bandwidth (per channel)||25MHz||25MHz||50MHz||50MHz|
|Programmable Trigger Delay||✔||✔||✔||✔|
|Max Scan Rate||120rpm||120rpm||120rpm||120rpm|