APPLICATIONS
AJ-7-178 + 7-Element CRPA
Highly Integrated
Dual-chip architecture combining a seven-channel anti-jamming RF IC and baseband processing chip.
Marine-Grade Protection
IP67; 28-day neutral salt spray; mechanical shock ≤50 g
Low Power Consumption
Total system power consumption < 18 W.
Adaptive Interference Detection
Suppresses up to 6 simultaneous jammers. Automatically detects interference signals within the operational environment.
The AJ-7-178 is a high-performance GNSS anti-jamming antenna system that integrates a seven-element antenna array and adaptive anti-jamming electronics within a single rugged enclosure. It provides adaptive spatial interference suppression against multiple jamming sources, helping maintain GNSS signal availability and positioning continuity in RF-contested environments.
Advanced CRPA
Controlled Reception Pattern Antenna (CRPA) array design enables spatial interference suppression and improves positioning robustness.
High RF Integrity
Precision-engineered front-ends with ultra-stable phase centers and out-of-band rejection.
Anti-Jamming Technology
Adaptive spatial filtering and nulling algorithms suppress multiple interference sources while maintaining reliable GNSS signal reception.
Marine-Grade Protection
Featured a salt-spray-resistant protective coating and an IP67 ingress-protection rating. The unit has passed a 28-day neutral salt-spray test.
Robust Operation
Maintains stable navigation performance under broadband, pulsed, narrowband, and swept-frequency interference conditions.
Field Resilience
Ruggedized design tested for extreme vibration, thermal shock, and high-dynamic flight.
| RF & Performance Specifications | |
|---|---|
| Antenna Elements | 7 elements: 6 × B1/L1/E1 + 1 × full-band GNSS |
| Frequency | BDS B1 / GPS L1 / Galileo E1 (Anti-Jamming) GPS L1/L2/L5; BDS B1/B2/B3; Galileo E1/E5/E6; GLONASS L1/L2/L3 (Full-Band GNSS) |
| Impedance | 50Ω |
| Passive Gain | 4.0dBi (maximum) |
| Isolation | ≥15dB |
| LNA Gain | 21 ± 1dB |
| Noise Figure | ≤2dB |
| Out-of-Band Rejection | ≥50dB @F0±50MHz |
| Jammer / Signal (J/S) | ≥100 dB single; ≥90 dB triple; ≥85 dB six-jammers; |
| Number of Jamming Sources | ≥6 |
| Electrical Specifications | |
| Voltage | 9 ~ 32VDC |
| Power Consumption | ≤18W |
| Mechanical & Environmental | |
| Dimensions | Ø178 × H56 mm (excluding connectors) |
| Weight | ≤2kg |
| Connector | JTNC-K RF; ZLN.2F.316.CLL-2B power/control |
| Waterproof Rating | IP67 (Mounting) |
| Mounting | 5/8"-11 threaded mount |
| Operating Temperature | -40°C to +55°C |
| Salt Spray / Shock / Compliance | 28-day neutral salt spray; mechanical shock ≤50 g; |
Adaptive Null-Steering Against Multi-Source Jamming
The 4-element CRPA array dynamically identifies jamming signals and creates “Deep Nulls” in their direction. Even with multiple or mirrored jammers, the antenna maintains a high-gain beam toward GNSS satellites, ensuring uninterrupted PNT (Position, Navigation, and Timing) in contested environments.
Structure Drawing
Interface Definition
Power / Control Interface: ZLN.2F.316.CLL-2B connector for DC power and RS422 communication. RF output is provided through the TNC-K connector to the external GNSS receiver.