Radar video signal acquisition and playback system

(1) Video AD signal, the amplitude is ±5V;

(2) Trig trigger signal, ±3.3VCMOS level signal 3000Hz;

(3) BP azimuth signal, ±3.3VCMOS level signal 252Hz;

(4) HD 0 point signal, ±3.3VCMOS level signal 0.7Hz.

Figure 1 Timing diagram of trigger signal and echo video signal

Figure 2 Timing diagram of bearing signal and 0 o'clock signal

After the device is turned on and working, it is controlled by the trigger signal Trig to start collecting and storing. Each time the antenna rotates, a 0-point signal (HD) and 360 azimuth signals (BP) will be generated. 128-130 circles are collected each time. 128-130 0-point signals (the number of points collected can be set arbitrarily on the software). When working, not all the 360° azimuth angles are collected. It should be possible to set any angle collection on the software. In the area outside the collection fan angle, only digital counting is performed, and AD does not collect.

1. Ability to customize acquisition software according to user requirements and provide dynamic link libraries for secondary development by users;

2. Two options of automatic collection and manual collection can be set;

3. The sampling rate can be set by frequency division, and users can set the sampling rate according to their needs;

4. The acquisition time (collection length) after each trigger can be set;

5. The fan angle of the collection can be set arbitrarily (360° may not be all collected, set the collected fan angle as needed).

6. The format and type of data storage can be set as required, and the sampling rate can be set by yourself.

1. Each time the antenna rotates, a piece of data is stored separately, and it is stored before the start of the next round of acquisition.

2. For each collection, a folder named by time is automatically generated under the specified path, and the data stored in each circle is named by time and automatically stored in the generated folder. For example, if you set a number of 130 collections at a time, then There are 130 data files in this folder (one data per circle).

n Number of analog input channels: 2 channels, multi-modules can be expanded in parallel

n The highest sampling rate per channel: up to 125MSps at the same time;

n A/D resolution: 16Bit

n Input range: support multiple input ranges, ±0.2V, ±0.5V, ±1.0V, ±2.5V, ±5.0V, ±10.0V

n Input signal bandwidth: 0Hz～60MHz

n Gain and zero point are fully self-calibrated

n Trigger mode: manual trigger, external trigger (rising edge, falling edge can be set), internal trigger (rising edge, falling edge, window out trigger, window in trigger), with trigger logic OR, logic AND function

n Trigger level: the internal trigger level is 256 levels programmable within the range, and the external trigger level is TTL level

n Data storage mode: onboard cache, 2048M bytes/sheet

The playback waveform not only needs to restore the recorded high-speed video signal, but also needs to restore the timing waveform of the radar and the video signal output synchronously according to the trigger mode.

The hardware uses two cards to complete the above functions:

PCIe-based high-speed data playback card

n 1 channel 625Msps.

n 16bit resolution.

n 200MHz analog bandwidth

n Support continuous segment mode playback of infinite data files.

n PCIE X8 interface.

n Playback mode of waveform segmented by external trigger trig:

l Generate the trigger signal timing to drive the radar display terminal. At the same time, the data playback card is triggered externally.

l Output RS422 signal with azimuth information and ship head information, which is used to generate the same timing signal as the radar head.