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High-gain Advanced GPS Receiver (HAGR)

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.

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.

 
L1 Antenna Array Pattern   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.

 


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

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

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   Gain (dB)
7   8.5
16   12
109   20.4

Time to first fix

40 secs (cold – no time or position)

Re-acquisition

10 secs to valid position

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

GPS jammer location

GPS/inertial navigation

Ultra-tightly-coupled (UTC) GPS/inertial tracking



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.

Papers

White Paper - High-gain Advanced GPS Receiver (PDF: 345 KB)

07-09-001

Constrained Beamforming for Space GPS Navigation.
Proceedings of ION GNSS 2007, Ft. Worth, TX, Sept. 2007 (PDF: 200k)

07-01-002

Test Results from a Novel Passive Bistatic GPS Radar Using a Phased Sensor Array
Proceedings of the ION National Technical Meeting 2007, San Diego, CA, Jan. 2007 (PDF: 312k)

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)

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)

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)

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)

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)

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)

Brochure

High-gain Advanced GPS Receiver (PDF: 257 KB)

Contact
Debbie Westra
info@navsys.com
toll free: 866.4.NAVSYS (866.462.8797)
or 719.481.4289

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