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| High-gain Advanced GPS Receiver (HAGR) |
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NAVSYS’ High-gain Advanced
GPS Receiver (HAGR) uses a digital beam steering antenna array
to provide gain in the direction of up to 12 GPS satellites
simultaneously on both the L1 and the L2 frequencies. This
approach has the following advantages for precision GPS applications.
- Digital beam steering increases the observed GPS signal-to-noise
ratio.
- Increase in gain to each satellite increases the GPS measurement
accuracy.
- Beam steering directivity reduces the effect of code and
carrier multipath error.
- Phase coherent signal sampling allows precise carrier
phase time transfer.
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| The digital beam steering automatically
adjusts the digital antenna array pattern, optimizing the signal
reception for both the L1 and the L2 frequencies by providing gain
in the direction of the satellite, as shown below.
HAGR has been proven to be a valuable research tool and may solve
your needs also.
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| L1 Antenna Array
Pattern |
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L2 Antenna Array
Pattern |
| Antenna configurations
This modular, digital architecture allows the HAGR to be
configured with different numbers of antenna elements and
different antenna array patterns, depending on the user’s
requirements. A small antenna array is available with 7 elements
(L1 and L2) and larger antenna arrays are also available with
16 or even 109 antenna elements providing 10 to 20 dB
of gain. Additionally, with the HAGR, a user-provided antenna
can be configured for use. |
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HAGR performance specifications
| DFE
Input Signals |
| Center frequency |
L1: 1575.42 MHz
L2: 1227.6 MHz |
| Signal
bandwidth |
24
MHz |
| No.
of antenna elements |
8
per DFE board
Up to 16 boards per HAGR system |
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| Receiver
CAC Specification |
| Source |
C/A code (SPS) and
P(Y) code (PPS) |
| Channels |
12 SV channels (L1
and L2) |
| Data Output |
I and Q (E/P/L all
codes) at 1 kHz |
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| Operating
Specifications |
| Signal
acquisition |
0-32 dB-Hz (depending
on mode of operation) |
| Signal
tracking (carrier phase locked) |
0-34 dB-Hz (depending
on mode of operation) |
| Beam steering gain on GPS
signal |
| No. of Elements |
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Gain (dB) |
| 7 |
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8.5 |
| 16 |
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12 |
| 109 |
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20.4 |
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| Time
to first fix |
40 secs (cold –
no time or position) |
| Re-acquisition |
10 secs to valid position |
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| Built-in
Modules |
| GPS and WAAS
search, acquisition and tracking |
| GPS stand-alone
navigation and DGPS (reference and remote) |
| Precise Timing
Reference (1-pps and IRIG-B) |
| Beam steering and
self-calibration |
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| GPS jammer location |
| GPS/inertial
navigation |
| Ultra-tightly-coupled
(UTC) GPS/inertial tracking |
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HAGR Related Info
| Related
Products |
| Advanced
GPS Hybrid Simulator (AGHS). The AGHS provides a unique
test capability allowing recording and playback of the phase
coherent sampled GPS signals. This allows post-test analysis
of recorded GPS field test data and playback of the same data
with different spatial processing in place of the HAGR beam
steering for comparative performance evaluation. |
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| Downloadable
Papers |
| White Paper - High-gain Advanced GPS
Receiver (PDF:
345 KB) |
05-09-004 |
Remote Sensing Using Bistatic GPS and
a Digital Beam Steering Receiver.
Proceedings of ION GNSS 2005,
Long Beach, CA, Sept. 2005 (PDF:
543 KB) |
05-09-002 |
GPS Multipath Mitigation Using a Three
Dimensional Phased Array.
Proceedings of ION GNSS 2005,
Long Beach, CA, Sept. 2005 (PDF:
272 KB) |
04-03-001 |
Architecture and Performance Testing of a Software
GPS Receiver for Space-based Applications.
Proceedings of IEEEAC, Big Sky,
MT, Mar. 2004 (PDF: 797
KB) |
| 03-09-005 |
Bi-Static Sensing with Reflected GPS
Signals Observed with a Digital Beam-Steered Antenna
Array
Proceedings of ION GPS/GNSS 2003,
Portland, OR, 9-12 Sept. 2003 (PDF: 250 KB)
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| 03-09-002 |
Phase Center Calibration and Multipath
Test Results of a Digital Beam-Steered Antenna Array
Proceedings of ION GPS/GNSS 2003,
Portland, OR, 9-12 Sept. 2003 (PDF: 300 KB)
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| 03-06-002 |
Space Navigation with Digital Beam Steering
GPS Receiver Technology.
Proceedings of ION 59th Annual
Meeting, Albuquerque, NM, June 2003 (PDF: 520
KB) |
| 02-11-002 |
Reprogrammable, Digital Beam-Steering
GPS Receiver Technology for Enhanced Space Vehicle Operations
Proceedings of 2002 Core Technologies
for Space Systems Conference, Colorado Springs, CO,
Nov. 2002 (PDF: 517 KB)
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| 02-11-001 |
High Accuracy Differential and Kinematic
GPS Positioning Using a Digital Beam-Steering Antenna
Proceedings of 2002 Core Technologies
for Space Systems Conference, Colorado Springs, CO,
Nov. 2002 (PDF: 515
KB) |
| 02-09-001 |
Rapid Ambiguity Resolution using Multipath
Spatial Processing for High Accuracy Carrier Phase.
Proceedings of ION GPS 2002,
Portland, OR, Sept. 2002 (PDF: 618 KB)
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| 02-05-002 |
Performance and Jamming Test Results
of a Digital Beamforming GPS Receiver.
Proceedings of the Joint Navigation
Conference 2002, Orlando, FL, May 2002 (PDF: 804 KB)
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| 01-09-004 |
Modular GPS Software Radio Architecture.
Proceedings of ION GPS 2001,
Salt Lake City, UT, Sept. 2001 (PDF: 1.1 MB) |
| 01-09-003 |
Test Results from a Digital P(Y) Beamsteering
GPS Receiver Designed for Carrier-Phase Time Transfer.
Proceedings of ION GPS 2001,
Salt Lake City, UT, Sept. 2001 (PDF: 598 KB) |
| 01-09-001 |
Test Results of a Digital Beamforming
GPS Receiver in a Jamming Environment
Proceedings of ION GPS 2001,
Salt Lake City, UT, Sept. 2001 (PDF: 738 KB) |
| 01-06-003 |
Multipath Characterization Using Digital
Phased Arrays.
Proceedings of ION 57th Annual
Meeting 2001, Albuquerque, NM, June 2001 (PDF: 642 KB) |
| 01-06-002 |
Test Results from Digital P(Y) Code
Beamsteering Receiver for Multipath Minimization.
Proceedings of ION 57th Annual
Meeting 2001, Albuquerque, NM, June 2001 (PDF: 487 KB) |
| 00-06-002 |
Detection and Location of GPS Interference
Sources Using Digital Receiver Electronics.
Proceedings of ION Annual Meeting,
San Diego, CA, June 2000 (PDF: 130 KB) |
| 99-09-005 |
Jammer and Interference Location System.
Proceedings of the ION GPS ‘99,
Nashville, TN, Sept. 1999 (PDF: 262 KB) |
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| Downloadable
Brochure |
| High-gain Advanced GPS
Receiver (PDF: 257
KB) |
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| Contact |
Debbie Westra
info@navsys.com
toll free: 866.4.NAVSYS (866.462.8797)
or 719.530.0600 |
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