|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|
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 WITH AGC (GPF-CA-004-04)
GPS AGC FRONT END (GPF-CA-007-04)
SINGLE FREQUENCY DOWNCONVERTERS
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 WITH AGC (GPF-DF-007-04)
- GPS FRONT ENDS with M-code downconverters: DC-2-001M-01/DC-2-007-04
DUAL FREQUENCY DOWNCONVERTERS
|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|
|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
Sampling rate 60 MSPS @ 2 bits
Sampling rate 77.67 HSPS @ variable bits (2, 4, 8, 14)
- Multiple-frequency units available (similar to dual-frequency but also includes the third (L5 frequency).
- User can easily alter all frequencies to accommodate Glonass, Galileo, and/or other frequencies.
- Various Antenna configurations (including LNA) available.
- Correlators (FPGA) and DSP-processors available as add-ons to front-ends.
- 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)
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.