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GPS and Navigation Products

Navigational System Design & Development Products:
RF Front Ends

RF front ends downconvert GPS signals to IF and then digitize them at user-specified rates. Digitized data go either to PC RAM or to hard disk. The software receiver uses data from the front end. The RF front end includes a downconverter board and data-logging board. The data-logging board mounts into the PCI slot of the host platform (PC). Users can mount the downconverter board as a daughter card of the data-logging board or keep it outside the PC, using separate enclosure with an independent power supply.

ITEM 1A: Single-Frequency GPS Front End

GPS FRONT END (GPF-CA-001-01)
Downconverter: DC-1-002-01
Data-Logger: DL-1-002-01

GPS FRONT END WITH AGC (GPF-CA-004-04)
Downconverter: DC-1-004-01
Data-Logger: DL-1-002-01

GPS AGC FRONT END (GPF-CA-007-04)
Downconverter: DC-1-007-94
Data-Logger: DL-1-002-01

SINGLE FREQUENCY DOWNCONVERTERS
  DC-1-002-01 DC-1-004-01 DC-1-007-04
Input Frequency 1,575.42 MHz 1,575.42 MHz 1,575.42 MHz
Bandwidth 4 MHz 4 MHz 2 MHz
Noise Figure 4.5 dB 4.5 dB 4.0 dB
Gain 70 dB 90 dB 80 dB
Gain Range 0-30 dB (2 dB steps) AGC N/A
Final IF 3.99 MHz 3.99 MHz 2.556 MHz
Antenna Single L1, Integrated 26 dB LNA Single L1, Intergated 26 dB LNA Same
Antenna Power 12V dc 12V dc 12V dc
Housing 6x4x0.9"; SMA Connectors 6x4x0.9"; SMA Connectors 4x2x0.9"
Power Consumption 2.6 w 2.6 w 275 mw
Ext. Clock Input 10 MHz 10 MHz N/A

DATA LOGGER: DL-1-002-01
Sample rate: 4 to 10 MHz, 2 bits (up to 12 bits optional)
Interface: PCI bus

ITEM 1B: Dual-Frequency GPS Front End

GPS FRONT END (GPF-DF-002-01)
Downconverter: DC-2-001-01
Data-Logger: DL-2-001-01/DL-2-007-04

GPS FRONT END WITH AGC (GPF-DF-007-04)
Downconverter: DC-2-007-04
Data-Logger: DL-2-001-01/DL-2-007-04

  • GPS FRONT ENDS with M-code downconverters: DC-2-001M-01/DC-2-007-04


DUAL FREQUENCY DOWNCONVERTERS
  DC-2-002-01 DC-2-007-04
Input Frequency L1 & L2 1575.42 MHz 1227.6 MHz Same
Bandwidth 18 MHz 18 MHz
Noise Figure 4.5 dB 4.5 dB
Gain 70 dB 90 dB
Gain Range 0-30 dB (2 dB steps) AGC
Final IF 13.99 MHz/13.60 MHz 13.99 MHz/13.60 MHz
Antenna Single L1/L2, Integrated 26 dB LNA Same
Antenna Power 12V dc 12V dc
Housing 4x6x0.9" 4x6x0.9"
Power Consumption 7 w 8 w
Ext. Clock Input 10 MHz 10 MHz


  • DC-2-001M-01 and DC-2-007M-04 have bandwidths of 24 MHz

DATA-LOGGERS:

DL-2-001-01
Sampling rate 60 MSPS @ 2 bits
DL-2-007-04
Sampling rate 77.67 HSPS @ variable bits (2, 4, 8, 14)

  1. Multiple-frequency units available (similar to dual-frequency but also includes the third (L5 frequency).
  2. User can easily alter all frequencies to accommodate Glonass, Galileo, and/or other frequencies.
  3. Various Antenna configurations (including LNA) available.
  4. Correlators (FPGA) and DSP-processors available as add-ons to front-ends.
  5. RAM-based and hard disk-based storage devices also available for front-ends.

Multi-Antenna GPS Front End (4 RF inputs to 4 IF outputs)

GPS MULTI-FRONT END (GPF-MA-003-01)
Downconverter: DC-003-01
Data-Logger: DL-003-01

Specifications

Multiple antennas and RF front ends with a common local oscillator (LO) allow space-time processing. All downconverters are mounted in a single card. Another PCI card with multiple inputs logs data.

User-specified custom products

150 MHz/400 MHz front ends: Specialized adaptation for satellite applications at 150 and 400 MHz and/or other frequencies. All downconverters use programmable LOs, easing this adaptation and frequency modification.

Antennas and LNAs

We have developed GPS antennas for advanced applications, including novel L1 and L2 antennas with performacne superior to currently available models. These include one L1, L2, L5 antenna (US Patent 6,940,457) suitable for future signals (including M-code and Galileo), and several multi-element antennas (CRPA) with 5 and 7 elements of single and dual frequencies.

These antennas use novel fractal elements and Electronic Bond Gap (EBG) materials to control surface waves. Some have a unique (US Patent 6,940,457) vertical choke-ring structure. Like the antennas, these choke rings are smaller yet more sensitve than standard.

Their areas of improvement include front-to-back ratio, polarizations, gained flatness, bandwidth, phase center stability, overall gain, and smoothness of gain variation with elevation.

The antennas have built-in LNAs. Separate LNA modules also available.


  1. Antenna Unit (L1, L2)
  2. Antenna Unit (L1, L2, L5)

GPS and Navigation Products

  • Navigational System Design & Development Products
  • Navigational Signal Simulators
  • Multi-Frequency GPS and GNSS Receivers
  • Pseudolites
  • GPS/GNSS Antennas
  • NAVWAR

Products covered in this section:

  • RF Front Ends
  • Software Receiver
  • Hard Disk-Based Storage System
  • Modular Correlators and DSP Processors
  • GPS/GNSS Signal Simulator Software
  • Hybrid Simulator
  • Complete real-time navigational development
  • System Application
  • Real-Time GPS/GNSS Simulators








































































Single-Frequency GPS Front End (brochure)

Dual-Frequency GPS Front End (brochure)

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