Gmm-u5j is one of the newest members of the u5 series featuring “Anti-JACK™”, or Anti-Jamming Assessment Command Feedback system: a powerful, easy to use jamming-detect and notification system designed specifically for critical asset protection and security.

Anti-JACK™ is able to alert the security system embedded with Gmm-u5j GPS receiver on nearby GPS jammers through its customized NMEA protocol, or via direct voltage level with dedicated hardware pin out. System integrators can transmit the protocol to a cellular radio of his choice to remotely alert users, or have it connect to a physical alarm or siren that blast out loud when the system is tempered with.

In addition, Gmm-u5j also features the new smart antenna system "Antenna Advisor" that detects and notifies different antenna statuses, including antenna open circuit and short circuits. Gmm-u5j supports up to 66 channels of satellite searching under -165dBm sensitivity, 10Hz maximum update rate, and customizable firmware for maximum versatility.

suitable applications

• hardware upgrade for LEA GPS receivers
• anti-theft systems
• security systems

features

Anti-J.A.C.K™ (Anti-Jamming Assessment Command FeedbacK)

• Jammer Status Report via:
  • Customized NMEA (to send protocol to external GSM/GPRS modem)
  • Hardware Pin Voltage Output (to activate external vehicle security system or siren)
• Jamming Sensitivity: -50dBm (high sensitivity) & -40dBm (low sensitivity)
• Auto Jamming Sensitivity Selection based on Antenna Type (Active vs. Passive)
• Power Saving Mode for Jammer Detection

Antenna Advisor

• Active /Passive Antenna Detection & Notification
• Open Circuit Detection & Notification
• Short Circuit Protection & Notification

Popular Form Factor

• 22.4 x 17 x 2.2mm SMD

High Sensitive, Performance

• MediaTek MT3329 Chipset, L1 Frequency, C/A code, 66 Channels
• -165 dBm Tracking (typical), TCXO design
• Position Accuracy: 3.0M 2D-RMS
• DGPS (WAAS/EGNOS/MASA/GAGAN)
• Multi-path Compensation ; E-GSM-900 Band Rejection

Rich Interface and Protocol Support

• UART (TTL), USB Interface Support; 1PPS Support
• NMEA 0183 and PMTK protocol supporterences

firmware options

• Anti-JACK™
• 10Hz Update
• AGPS Support
• Binary Protocol
• 223 Datum support
• Distance Calculation
• High Altitude Unlimiter
• Geofencing
• Last Position Retention
• Magnetic Variation
• Navigation Speed Threshold
• One sentence Output
• Timing Mode

specifications

Gmm-u5j GPS Receiver Specifications

• Dimension:  22.4 x 17 x 2.2 mm, SMD type
• GPS Solution:  MTK MT3329, 66 Channels
• Frequency:  L1, 1575.42 MHz ; C/A Code
• Sensitivity:
  • Acquisition -148 dBm
  • Tracking -165 dBm
• Position Accuracy:
  • Without aid: 3.0 m 2D-RMS
  • DGPS (SBAS(WAAS,EGNOS,MSAS)): 2.5 m 2D-RMS
• TTFF (Time to First Fix):
  • Cold Start: <35 Seconds (Typical)
  • Warm Start: <34 Seconds (Typical)
  • Hot Start: <1 Seconds (Typical)
• Timing Accuracy (1PPS Output):  100 ns RMS
• Protocol:  NMEA 0183, MTK Command
• DGPS:  SBAS [WAAS, EGNOS, MSAS,GAGAN]
• AGPS:  Supported (Offline Mode)
• Interface:  1 UART, 1 USB
• Baud Rate:  4800 ~ 115200 bps
• Update Rate:  1 ~ 10 Hz
• Power Supply:
  • VCC: 3.0 V to 3.6 V
  • VBACKUP: 2.0 V to 4.3 V
• Current Consumption:
  • Acquisition: 33 mA
  • Tracking: 26 mA
• Working Temperature:  -40 °C to +85 °C

Gmm-u5j GPS Jammer Detection Specifications

• Jamming Sensitivity  -50dBm (High Sensitivity) & -40dBm (Low Sensitivity)
• Jamming Detection:  Built-in high gain and band selection device for detection
• Jamming Power Supply:  VCC: 2.5 v to 3.3 v
• Current Consumption:  16 mA working

references

• manufacturer name: GlobalTop Technology, Inc.
• manufacturer's part name(s): Gmm-u5j
• manufacturer's part code(s): Gmm-u5j
• documentation archive

As a GlobalTop distributor, we will be happy to quote a price for your volume order.