China SRTC (the State Radio_monitoring_center Testing Center) defines the types of radar waveforms for China radar profiles. The detailed parameters are listed in the table below.
Radar type 1~4 are constant PRF based signals.
Radar type 5 and 6 are single pulse based or packet based staggered PRF radar test signals using 2 or 3 different PRF values.
| Radar Type | Pulse Width (μs) | Pulse Repetition Frequency PRF(Hz) | Number of Different PRFs | Number of Pulses per Burst |
|---|---|---|---|---|
| Reference | 1 | 1000 | NA | 20 |
| 1 | 0.5~5 | 200~1000 | 1 | 12 |
| 2 | 0.5~15 | 200~1600 | 1 | 16 |
| 3 | 0.5~30 | 2300~4000 | 1 | 24 |
| 4 | 20~30 | 2000~4000 | 1 | 20 |
| 5 | 0.5~2 | 300~400 | 2 or 3 | 12 |
| 6 | 0.5~2 | 400~1200 | 2 or 3 | 16 |
Note:
Radar test signal 4 is a modulated radar test signal. The modulation to used is a chirp modulation with a ±2.5MHz frequency deviation.
The total number of pulses in a burst is equal to the number of pulses for a signal PRF multiplied by the number of different PRFs used.
Figure 1. General Structure of a Multiple Burst/Constant PRF Based Radar Test Signal
Figure 2. General Structure of a Single Burst, Single Pulse Based Stagger PRF Radar Test Signal
Figure 3. General Structure of a Single Burst, Packet Based Stagger PRF Radar Test Signal