NanoVNA-J vector network analyzer

This project is NanoVNA-J that I only made after referring to the NanoVNA of wdywhq001. I will share my project in the hope that it will be helpful to everyone.
NanoVNA by wdywhq001: https://www.mydigit.cn/forum.php?mod=viewthread&tid=189597
 
1 Product Introduction
NanoVNA is a very small, very portable but high-performance vector network analyzer. It has an independent TFT touch screen and a 3.7V lithium battery, which can work offline for 4 hours. This project involves many aspects of software and hardware.
 
2 Application Scenarios
In the R&D and production of radio frequency and microwave devices, high-performance vector network analyzers play a vital role in the electrical performance analysis of various microwave devices. It has two types of testing functions, frequency domain and time domain, and can well complete the debugging and testing of various parameters of devices such as filters, amplifiers, attenuators, and active and passive microwave components in the system.
The frequency range of this network analyzer is from 50KHz to 900MHz, and the spread spectrum can be up to 1.5GHz. It can cover the test requirements of civilian 144M (walkie-talkie), 230M, 315M, 433M, 490M, 764M, 868M, 915M and other frequency bands; its basic function is Test small signal S parameters, as well as derived related parameters (insertion loss, return loss, gain, group delay, TDR, etc.).
 
3 Product Overview
Implementation Principle:
External parameters:
USB power supply: 5V / 300mA;
USB interface: USB type-C;
Communication mode: CDC (serial);
TF card: ≥128M;
Lithium battery: ≥3.3V, ≥750mAh, 750mAh The battery can work offline for about 3 hours;
maximum output signal: 0dBm;
maximum input signal: 15dBm;
RF interface size: compatible with SMA/2.92mm/3.5mm Female;
display: 2.8-inch TFT (320 x240);
 
internal parameters:
dynamic range: S11 dynamic: 50KHZ-300MHZ is better than 60dB, 300MHZ-900MHZ is better than 60dB, 900MHZ-1.5GHZ is better than 40dB;
S21 dynamic: 50KHZ-300MHZ is better than 70dB, 300MHZ-900MHZ is better than 70dB, 900MHZ-1.5GHZ is better than 50dB;
Antenna analysis SWR: 50KHZ-300MHZ<1.005, 300MHZ-900MHZ<1.02, 900MHZ-1.5GHZ<1.06;
Undervoltage protection: If the LDO output voltage is <4V, the device will automatically shut down;
Scanning speed: 201 points/second, interpolation available;
Sampling rate: 192kbps;
File format: s1p, s2p, can be stored to TF card;
Operating system: ChibiOS;
Firmware upgrade: Direct firmware upgrade via USB;
 
 
4 Product Advantages
Economical instrument with reliable performance
Compact vector network analyzer
with low Trace noise ensures high-precision
measurement and fast speed.
User interface using multi-touch screen.
Clear user interface.
Standard instrument suitable for laboratory applications.
Convenient and fast calibration.
Remote serial port control scanning can be realized through USB, and data can be transmitted back to the host computer.
 
5 User guide
interface operation logic:
 
6 usage tutorial (usage method + burning firmware + computer installation position), please view it in the attachment